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JP6074145B2 - Hydrogen permeation prevention coating - Google Patents
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JP6074145B2 - Hydrogen permeation prevention coating - Google Patents

Hydrogen permeation prevention coating Download PDF

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JP6074145B2
JP6074145B2 JP2012046095A JP2012046095A JP6074145B2 JP 6074145 B2 JP6074145 B2 JP 6074145B2 JP 2012046095 A JP2012046095 A JP 2012046095A JP 2012046095 A JP2012046095 A JP 2012046095A JP 6074145 B2 JP6074145 B2 JP 6074145B2
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森田 泰史
泰史 森田
龍彦 相澤
龍彦 相澤
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表面機能デザイン研究所合同会社
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この発明は、水素透過防止被膜に係り、特に、ナノレベルの膜厚のDLC薄膜を多数積層させた構造を有する水素透過防止被膜に関する。   The present invention relates to a hydrogen permeation preventive coating, and more particularly, to a hydrogen permeation preventive coating having a structure in which a number of nano-level DLC thin films are laminated.

未来のエネルギー循環型持続可能社会を成し遂げるために、燃料電池は石化燃料に代わるエネルギー源として最も期待されている環境技術の一つである。日本においては、すでに10年以上も前から燃料電池の可能性を高く評価し、政府、民間事業者及び多くの研究者がその実用化をめざし、統合システムや新規技術及び法整備などで課題解決に向け検討・研究を開始している。
その礎として、政府は各省副大臣会議において、2002年に燃料電池実用化に向けたエネルギー戦略や解決すべき具体的技術課題と達成すべき日程計画を含む総合ビジョンと技術指針を決定し、提示している。
Fuel cells are one of the most promising environmental technologies to replace fossil fuels in order to achieve a future energy-circulating sustainable society. In Japan, the possibility of fuel cells has already been highly evaluated for more than 10 years, and the government, private enterprises, and many researchers aim to put it into practical use, solving problems with integrated systems, new technologies and legal development. Study and research have started.
As the foundation, the government decided and presented the general vision and technical guidelines at the ministerial deputy ministers' meeting in 2002, including the energy strategy for practical application of fuel cells, specific technical issues to be solved, and the schedule to be achieved. doing.

この政府決定に基づき、大学研究者や民間研究機関及び民間事業者がコンソーシアムを設立し、政府からの財政支援を得て、提示されている技術課題解決に向け研究活動を行っている。この国家プロジェクトの目的は家庭用燃料電池および燃料電池車の実用化を達成することにある。
特に燃料電池車は移動体であることから、ガソリン車と同じような性能を発揮することは勿論であるが、水素ガスを燃料とすることから一層の安全性を求められている。
Based on this government decision, university researchers, private research institutes, and private enterprises have established a consortium, and with the financial support from the government, they are conducting research activities to solve the proposed technical issues. The purpose of this national project is to achieve commercialization of household fuel cells and fuel cell vehicles.
In particular, since the fuel cell vehicle is a moving body, it naturally exhibits the same performance as a gasoline vehicle, but since hydrogen gas is used as fuel, further safety is required.

さらに燃料電池車は、積載する水素ガスを高圧にすることで走行距離を伸ばすことや、ガソリンスタンドに代わる水素ガス・ステーションに水素ガス製造基地から高圧ガス・タンクローリーによって水素ガスを配送することが計画されている。   In addition, the fuel cell vehicle plans to extend the mileage by increasing the pressure of the loaded hydrogen gas, and to deliver the hydrogen gas from the hydrogen gas production base to the hydrogen gas station instead of the gas station using the high-pressure gas tank truck. Has been.

このような燃料配送時や車載のコンテナーやタンクに高圧貯蔵される水素ガスの透過量を制御し、金属の脆化を防止する技術は安全性確保のためにはなくてはならない最大の課題といえる。政府の技術指針によれば、車両積載および高圧ガス・タンクローリーともども、燃料貯蔵用タンクとしてアルミ合金製シリンダーにFRPまたはCFRPを全周に被覆したものが計画されている。   Technology that prevents the embrittlement of metals by controlling the amount of hydrogen gas that is stored at high pressure in containers and tanks installed in vehicles and during fuel delivery is the biggest issue that must be secured to ensure safety. I can say that. According to the technical guidelines of the government, both the vehicle loading and the high-pressure gas tank lorry are planned as a fuel storage tank with an aluminum alloy cylinder covered with FRP or CFRP all around.

しかしながら、これらの樹脂やアルミ合金は水素透過性が高い材料であるため、この透過特性を制御する技術が不可欠であり、水素ガス制御技術としての表面処理や被膜形成に期待が集まっている。
例えば、東京大学大学院工学研究科の寺井・鈴木・近田による「水素エネルギーシステムのための要素技術開発」(非特許文献1)及び「先進原子力システムにおける配管コーティングに関する研究」(非特許文献2)において、水素透過防止性薄膜の材料として酸化エルビウム(ER2O3)が報告されている。
However, since these resins and aluminum alloys are materials having high hydrogen permeability, a technique for controlling the permeability is indispensable, and expectations are gathered for surface treatment and film formation as a hydrogen gas control technique.
For example, in "Development of Elemental Technology for Hydrogen Energy System" (Non-Patent Document 1) and "Study on Piping Coating in Advanced Nuclear System" (Non-Patent Document 2) by Terai, Suzuki and Chikada, Graduate School of Engineering, University of Tokyo As a material for the hydrogen permeation preventive thin film, erbium oxide (ER2O3) has been reported.

水素エネルギーシステムのための要素開発技術 インターネットURL:http://www.nuclear.jp/utnl-w/0023/F/19F-08.pdf 検索日:平成24年2月17日Element development technology for hydrogen energy system Internet URL: http://www.nuclear.jp/utnl-w/0023/F/19F-08.pdf Search date: February 17, 2012 先進原子力システムにおける配管コーティングに関する研究 インターネットURL:http://www.tokai.t.u-tokyo.ac.jp/utnl-w/0025/F/21F-08.pdf 検索日:平成24年2月17日Research on piping coating in advanced nuclear power system Internet URL: http://www.tokai.t.u-tokyo.ac.jp/utnl-w/0025/F/21F-08.pdf Search date: February 17, 2012

非特許文献2の研究によれば、「水素ガス透過試験で試験温度が高くなると被膜の結晶粒径が成長し、水素透過が低下することから、薄膜中で水素は結晶粒界に沿って移動していることが示唆された」と結論付けている。
このことからすると、被膜構造の制御を行うことで高密度被膜を形成し、水素透過経路を遮断することで、水素不透過性が得られるのではないかと考えられる。
したがって、アモルファス構造で被膜密度が高いDLC(Diamond-Like Carbon)被膜は、水素ガス不透過性を目指すには最適な被膜種と推察できる。
ただし、単層構造のDLC被膜では容易にクラックが発生し、そのクラックが水素透過経路となり、ガス漏洩が発生し、期待する特性が得られないことは明白であり、更なる被膜構造の検討が必要とされる。
According to the research of Non-Patent Document 2, "the hydrogen gas permeation test increases the crystal grain size of the coating and the hydrogen permeation decreases as the test temperature increases, so that hydrogen moves along the grain boundary in the thin film. It was suggested that they are doing.
From this, it is thought that hydrogen impermeability can be obtained by forming a high-density coating by controlling the coating structure and blocking the hydrogen permeation path.
Therefore, a DLC (Diamond-Like Carbon) film having an amorphous structure and a high film density can be inferred as an optimum film type for achieving hydrogen gas impermeability.
However, it is clear that a single layer DLC film easily cracks, and that the crack becomes a hydrogen permeation path, gas leakage occurs, and the expected characteristics cannot be obtained. Needed.

この発明は、このような現状に鑑みてなされたものであり、クラックが発生し難く、水素ガスの透過をより確実に防止可能な構造を備えた水素透過防止被膜を提供することを目的としている。   The present invention has been made in view of such a situation, and an object of the present invention is to provide a hydrogen permeation preventive coating having a structure in which cracks are unlikely to occur and hydrogen gas permeation can be more reliably prevented. .

上記の目的を達成するため、請求項1に記載の水素透過防止被膜は、ナイロン11よりなる基材の表面に、ナノレベルの膜厚のDLC薄膜を複数積層させたナノ積層DLC被膜よりなる水素透過防止被膜であって、上記ナノ積層DLC被膜が、相互に硬度の異なる複数の領域に区分された複合ナノ積層DLC被膜よりなり、各領域が、それぞれ硬度の異なる2種類のDLC薄膜を交互に積層させた構造を備えており、さらに、上記複合ナノ積層DLC被膜全体の厚さが530nm以上であることを特徴としている。 In order to achieve the above object, the hydrogen permeation preventive coating according to claim 1 is a hydrogen comprising a nano-laminated DLC coating in which a plurality of nano-level DLC thin films are laminated on the surface of a base material made of nylon 11. The nano-laminated DLC film is a permeation-preventing film, and the nano-laminated DLC film is composed of a composite nano-laminated DLC film that is divided into a plurality of regions having different hardnesses. It has a laminated structure, and the total thickness of the composite nano-laminated DLC film is 530 nm or more.

請求項2に記載の水素透過防止被膜は、ポリイミドよりなる基材の表面に、ナノレベルの膜厚のDLC薄膜を複数積層させたナノ積層DLC被膜よりなる水素透過防止被膜であって、上記ナノ積層DLC被膜が、相互に硬度の異なる複数の領域に区分された複合ナノ積層DLC被膜よりなり、各領域が、それぞれ硬度の異なる2種類のDLC薄膜を交互に積層させた構造を備えており、さらに、上記複合ナノ積層DLC被膜全体の厚さが178nm以上であることを特徴としている。 The hydrogen permeation preventive film according to claim 2 is a hydrogen permeation preventive film comprising a nano-laminated DLC film in which a plurality of nano-level DLC thin films are laminated on the surface of a substrate made of polyimide. The laminated DLC film is composed of a composite nano-laminated DLC film divided into a plurality of regions having different hardnesses, and each region has a structure in which two types of DLC thin films having different hardnesses are alternately laminated, Furthermore, the composite nano-laminated DLC film has a total thickness of 178 nm or more .

請求項3に記載の水素透過防止被膜は、アルミニウムよりなる基材の表面に、ナノレベルの膜厚のDLC薄膜を複数積層させたナノ積層DLC被膜よりなる水素透過防止被膜であって、上記ナノ積層DLC被膜が、相互に硬度の異なる複数の領域に区分された複合ナノ積層DLC被膜よりなり、各領域が、それぞれ硬度の異なる2種類のDLC薄膜を交互に積層させた構造を備えており、また、上記複合ナノ積層DLC被膜全体の厚さが530nm以上であり、さらに、上記複合ナノ積層DLC被膜と基材との間に、3層の金属被膜を積層させた構造の中間層が形成されていることを特徴としている。


The hydrogen permeation preventive coating according to claim 3 is a hydrogen permeation preventive coating comprising a nano-laminated DLC film in which a plurality of nano-level DLC thin films are laminated on the surface of a base material made of aluminum. The laminated DLC film is composed of a composite nano-laminated DLC film divided into a plurality of regions having different hardnesses, and each region has a structure in which two types of DLC thin films having different hardnesses are alternately laminated, The total thickness of the composite nanolaminate DLC coating is 530 nm or more, and an intermediate layer having a structure in which three metal coatings are laminated is formed between the composite nanolaminate DLC coating and the substrate. It is characterized by having.


請求項4に記載の水素透過防止被膜は、請求項1〜3の水素透過防止被膜であって、上記複合ナノ積層DLC被膜が3つの領域に区分されており、中間に位置する領域の硬度が最も高く設定されていることを特徴としている。 The hydrogen permeation preventive film according to claim 4 is the hydrogen permeation preventive film according to claims 1 to 3, wherein the composite nano-laminated DLC film is divided into three regions, and the hardness of the region located in the middle is It is characterized by being set the highest .

請求項5に記載の水素透過防止被膜は、請求項1〜4の水素透過防止被膜であって、上記硬度の異なる2種類のDLC薄膜の中、硬度の高い方のDLC薄膜の膜厚を、他方のDLC薄膜の膜厚よりも厚く形成したことを特徴としている。   The hydrogen permeation preventive film according to claim 5 is the hydrogen permeation preventive film according to claims 1 to 4, wherein the thickness of the DLC thin film having a higher hardness among the two types of DLC thin films having different hardnesses is set as follows: It is characterized by being formed thicker than the film thickness of the other DLC thin film.

請求項1〜3に記載の水素透過防止被膜の場合、アモルファス構造のDLC薄膜を基材上に多層状に形成させたナノ積層DLC被膜よりなり、しかもこのナノ積層DLC被膜は、相互に特性の異なる複数の領域に区分されると共に、各領域は硬度の異なる2種類のDLC薄膜を交互に積層させた構造を備えているため、一部のDLC薄膜にクラックが生じても全体に拡大することがなく、連続した水素の経路が生じ難い特性を備えている。また、DLC薄膜間の界面において、水素がトラップされ易いという特性も備えている。このため、水素の実効透過速度を遅くすることができ、水素の透過を有効に防止することが可能となる。 The hydrogen permeation preventive coating according to any one of claims 1 to 3 , comprising a nano-stacked DLC coating in which a DLC thin film having an amorphous structure is formed in a multilayer shape on a base material, and the nano-stacked DLC coating has mutually characteristic properties. It is divided into a plurality of different regions, and each region has a structure in which two types of DLC thin films with different hardnesses are alternately laminated, so that even if some DLC thin films are cracked, the entire region is expanded. And has a characteristic that a continuous hydrogen path is unlikely to occur. In addition, it has a characteristic that hydrogen is easily trapped at the interface between the DLC thin films. For this reason, the effective permeation rate of hydrogen can be slowed, and the permeation of hydrogen can be effectively prevented.

図1(a)は、ナノ積層DLC被膜(Nano-laminated DLC/NL-DLC)10の基本構造を示す模式図であり、ポリイミドやナイロン11、アルミニウム等よりなる基材12の表面に、厚さ50〜100nmのDLC薄膜14を多数積層配置させた構造を備えている。   FIG. 1 (a) is a schematic diagram showing the basic structure of a nano-laminated DLC film (Nano-laminated DLC / NL-DLC) 10, which has a thickness on the surface of a substrate 12 made of polyimide, nylon 11, aluminum or the like. It has a structure in which a number of 50 to 100 nm DLC thin films 14 are stacked.

各DLC薄膜14は同じ特性を備えているものではなく、図2に示すように、硬度の異なる第1のDLC薄膜14aと第2のDLC薄膜14bの2種類のDLC薄膜を、交互に積層させた構造を備えている。
第1のDLC薄膜14aと第2のDLC薄膜14bは、それぞれ等しい膜厚を備えている。また、第1のDLC薄膜14aの硬度は、第2のDLC薄膜14bの硬度よりも高く設定されている。
Each DLC thin film 14 does not have the same characteristics. As shown in FIG. 2, two types of DLC thin films, ie, a first DLC thin film 14a and a second DLC thin film 14b having different hardnesses, are alternately laminated. It has a structure.
The first DLC thin film 14a and the second DLC thin film 14b have the same film thickness. The hardness of the first DLC thin film 14a is set higher than the hardness of the second DLC thin film 14b.

ナノ積層DLC被膜10の表面には、DLC薄膜よりなるトップコート(表面層)16が形成されている。
また、基材12がアルミニウム等の金属よりなる場合には、密着性を確保するため、クロム等の金属薄膜よりなる中間層18が基材12とナノ積層DLC被膜10との間に形成される(ポリイミド等の非金属材料で基材12を構成する場合、中間層18の形成は省略できる)。
A top coat (surface layer) 16 made of a DLC thin film is formed on the surface of the nano-stacked DLC coating 10.
When the substrate 12 is made of a metal such as aluminum, an intermediate layer 18 made of a metal thin film such as chrome is formed between the substrate 12 and the nano-laminated DLC coating 10 in order to ensure adhesion. (If the substrate 12 is made of a non-metallic material such as polyimide, the formation of the intermediate layer 18 can be omitted).

図1(b)は、この発明に係る水素透過防止被膜としての複合ナノ積層DLC被膜(Mesoscopic DLC/MS-DLC)20の基本構造を示す模式図であり、ポリイミドやナイロン11、アルミニウム等よりなる基材12の表面に、下部DLC被膜領域22、中部DLC被膜領域24及び上部DLC被膜領域26を積層配置させた構造を備えている。   FIG. 1 (b) is a schematic diagram showing the basic structure of a composite nanolaminate DLC film (Mesoscopic DLC / MS-DLC) 20 as a hydrogen permeation preventive film according to the present invention, which is made of polyimide, nylon 11, aluminum, or the like. The substrate 12 has a structure in which a lower DLC coating region 22, a middle DLC coating region 24, and an upper DLC coating region 26 are stacked on the surface of the substrate 12.

下部DLC被膜領域22、中部DLC被膜領域24及び上部DLC被膜領域26は、ナノ積層DLC被膜10と同様、それぞれ第1のDLC薄膜14aと第2のDLC薄膜14bを交互に積層させた構造を備えている。   The lower DLC coating region 22, the middle DLC coating region 24, and the upper DLC coating region 26 have a structure in which the first DLC thin film 14a and the second DLC thin film 14b are alternately stacked, similarly to the nano-stacked DLC coating 10. ing.

各領域に属する第1のDLC薄膜14aと第2のDLC薄膜14b間には、上記と同様、以下の関係が成り立つ。
(1) 膜厚:第1のDLC薄膜14aの膜厚=第2のDLC薄膜14bの膜厚
(2) 硬度:第1のDLC薄膜14aの硬度>第2のDLC薄膜14bの硬度
ただし、各領域間には、それぞれの硬度や密度において相違が存在している。この各領域間の特性の違いは、具体的には、第1のDLC薄膜14a及び第2のDLC薄膜14bそれぞれの厚さと積層数を異ならせることによって実現される(詳細は後述)。
As described above, the following relationship is established between the first DLC thin film 14a and the second DLC thin film 14b belonging to each region.
(1) Film thickness: film thickness of first DLC thin film 14a = film thickness of second DLC thin film 14b
(2) Hardness: Hardness of first DLC thin film 14a> Hardness of second DLC thin film 14b However, there is a difference in hardness and density between regions. Specifically, the difference in characteristics between the regions is realized by making the thickness and the number of stacked layers of the first DLC thin film 14a and the second DLC thin film 14b different (details will be described later).

ナノ積層DLC被膜10と同様、この複合ナノ積層DLC被膜20の表面にも、DLC被膜よりなるトップコート16が被着形成されている。
また、基材12がアルミニウム等の金属よりなる場合には、クロム等の金属薄膜よりなる中間層18が、基材12と複合ナノ積層DLC被膜20との間に形成される。
Similar to the nano-laminated DLC film 10, a top coat 16 made of the DLC film is also formed on the surface of the composite nano-laminated DLC film 20.
When the substrate 12 is made of a metal such as aluminum, an intermediate layer 18 made of a metal thin film such as chrome is formed between the substrate 12 and the composite nanolaminate DLC coating 20.

上記のナノ積層DLC被膜10及び複合ナノ積層DLC被膜20は、RF−PVDスパッタリング装置を用いて形成されるのであるが、その際に、ターゲットの種類、スパッタ電力、基材へのバイアス電圧、アルゴンガスとメタンガスの流量、アルゴンガスとメタンガスの比率、成膜回数、成膜時間、成膜温度、自転速度、ターゲットとの角度、公転の有無等を制御することにより、所望のDLC薄膜を形成することができる。   The nano-laminated DLC film 10 and the composite nano-laminated DLC film 20 are formed using an RF-PVD sputtering apparatus. At that time, the type of target, sputtering power, bias voltage to the substrate, argon A desired DLC thin film is formed by controlling the flow rate of gas and methane gas, the ratio of argon gas to methane gas, the number of film formation, the film formation time, the film formation temperature, the rotation speed, the angle with the target, the presence or absence of revolution, etc. be able to.

図3は、ある基材12の表面に形成した複合ナノ積層DLC被膜20の特性を例示するものである。
まず、上部DLC被膜領域26に関しては、領域全体の厚さが47.6nmに、第1のDLC薄膜14aと第2のDLC薄膜14bを合わせた総膜数が15に、第1のDLC薄膜14aと第2のDLC薄膜14bの膜厚がそれぞれ3.17nmに、領域全体の硬度が32GPaに形成されている。
この上部DLC被膜領域26の形成に際しては、一枚の薄膜当たり700Wの電力と70秒の時間が費やされている。
FIG. 3 illustrates the characteristics of the composite nanolaminate DLC coating 20 formed on the surface of a certain substrate 12.
First, regarding the upper DLC film region 26, the total thickness of the region is 47.6 nm, the total number of films including the first DLC thin film 14a and the second DLC thin film 14b is 15, and the first DLC thin film 14a The second DLC thin film 14b has a thickness of 3.17 nm, and the entire region has a hardness of 32 GPa.
In forming the upper DLC film region 26, 700 W of power and 70 seconds are consumed per thin film.

つぎに、中部DLC被膜領域24に関しては、領域全体の厚さが50.6nmに、第1のDLC薄膜14aと第2のDLC薄膜14bを合わせた総膜数が21に、第1のDLC薄膜14aと第2のDLC薄膜14bの膜厚がそれぞれ2.41nmに、領域全体の硬度が42GPaに形成されている。
この中部DLC被膜領域24の形成に際しては、一枚の薄膜当たり500Wの電力と70秒の時間が費やされている。
Next, for the middle DLC film region 24, the total thickness of the region is 50.6 nm, the total number of films including the first DLC thin film 14a and the second DLC thin film 14b is 21, and the first DLC thin film is formed. The film thickness of 14a and the second DLC thin film 14b is 2.41 nm, respectively, and the hardness of the entire region is 42 GPa.
In forming the middle DLC film region 24, 500 W of power and 70 seconds are consumed per thin film.

下部DLC被膜領域22に関しては、領域全体の厚さが50.6nmに、第1のDLC薄膜14aと第2のDLC薄膜14bを合わせた総膜数が35に、第1のDLC薄膜14aと第2のDLC薄膜14bの膜厚がそれぞれ1.45nmに、領域全体の硬度が37GPaに形成されている。
この下部DLC被膜領域22の形成に際しては、一枚の薄膜当たり300Wの電力と70秒の時間が費やされている。
Regarding the lower DLC coating region 22, the total thickness of the region is 50.6 nm, the total number of films including the first DLC thin film 14a and the second DLC thin film 14b is 35, and the first DLC thin film 14a The thickness of each of the two DLC thin films 14b is 1.45 nm, and the hardness of the entire region is 37 GPa.
In forming the lower DLC film region 22, 300 W of power and 70 seconds are consumed per thin film.

なお、複合ナノ積層DLC被膜20の全体の硬度が、中部DLC被膜領域24の硬度よりも高い46GPaであることを考慮すると、複合ナノ積層DLC被膜20は単に3つの領域が寄せ集まったものではなく、各領域がより複雑に合成された集合体であるといえる。   Considering that the overall hardness of the composite nanolaminate DLC coating 20 is 46 GPa, which is higher than the hardness of the middle DLC coating region 24, the composite nanolaminate DLC coating 20 is not simply a collection of three regions. In other words, it can be said that each region is an aggregate of more complicated synthesis.

上記構成を備えた複合ナノ積層DLC被膜20水素透過防止効果を確認するため、水素透過試験を実施した。
図4は、試験装置30を示す概念図であり、ガス導入管32と、ガス透過部34と、ガス排出管36と、検知器38とを備えている。
ガス透過部34は、一対の外部フランジ40, 40と、一対の内部フランジ42, 42と、各内部フランジ42に接着された一対のシーリングガスケット44, 44と、フィルタ46とを備えており、内部フランジ42, 42間に試験対象48が挟持される。
外部フランジ40, 40間には、複数のボルト50が挿通され、その両端にナット52が螺合されることにより、各外部フランジ40, 40は内側に向けて強く付勢される。
ガス導入管32から所定の圧力で注入された水素ガスは、ガス透過部34を通過し、ガス排出管36を経由して検知器38に導かれ、その分量が計測される。
In order to confirm the effect of preventing hydrogen permeation of the composite nanolaminate DLC film 20 having the above-described configuration, a hydrogen permeation test was performed.
FIG. 4 is a conceptual diagram showing the test apparatus 30, and includes a gas introduction pipe 32, a gas transmission part 34, a gas discharge pipe 36, and a detector 38.
The gas permeable portion 34 includes a pair of outer flanges 40, 40, a pair of inner flanges 42, 42, a pair of sealing gaskets 44, 44 bonded to the inner flanges 42, and a filter 46. A test object 48 is sandwiched between the flanges 42 and 42.
A plurality of bolts 50 are inserted between the outer flanges 40 and 40, and nuts 52 are screwed into both ends thereof, whereby each outer flange 40 and 40 is strongly urged inward.
The hydrogen gas injected at a predetermined pressure from the gas introduction pipe 32 passes through the gas permeation section 34, is led to the detector 38 via the gas discharge pipe 36, and the amount thereof is measured.

図5は、この水素透過試験の結果をまとめた一覧表である。
この一覧表は、試験対象、試験条件、試験結果の3項目に大別される。
また試験対象としては、基材12の材質により、ポリイミド、ナイロン11、アルミニウムに分類される。
さらに比較対象として、複合ナノ積層DLC被膜20を形成していない基材12だけで透過試験を実施した際の結果(試験番号P00、N00、A00)と、基材12上にナノ積層DLC被膜10を形成した際の結果(試験番号P01、N01)も掲載されている。
なお、基材12がポリイミド製の場合(試験番号P00、P01、P02-1、P02-2、P02-3)には、単体で0.3〜0.7MPaのガス圧に耐え切れないため、厚さ1.00mmのナイロン11を補強材として接合した状態で試験を実施している。
以下、試験結果について個別に説明する。
FIG. 5 is a list summarizing the results of this hydrogen permeation test.
This list is roughly divided into three items: test subjects, test conditions, and test results.
Test objects are classified into polyimide, nylon 11, and aluminum depending on the material of the base material 12.
Furthermore, as a comparison object, the results (test numbers P00, N00, A00) when the transmission test was performed only on the base material 12 on which the composite nano-stacked DLC film 20 was not formed, and the nano-stacked DLC film 10 on the base material 12 The results (test numbers P01, N01) when forming the are also listed.
In addition, when the base material 12 is made of polyimide (test numbers P00, P01, P02-1, P02-2, P02-3), it cannot withstand a gas pressure of 0.3 to 0.7 MPa alone, The test was conducted in a state where nylon 11 having a thickness of 1.00 mm was joined as a reinforcing material.
Hereinafter, the test results will be described individually.

まず、比較対象の一つである試験番号「P00」の場合、厚さ0.05mmのポリイミド製基材12に厚さ1.00mmのナイロン11を補強材として接合させた試験対象48をガス透過部34に装填した状態で、水素ガス(圧力:0.5MPa/温度:摂氏28.8度)を2時間注入したところ、透過量:175ppm、透過係数:3,754という結果が得られた。   First, in the case of test number “P00”, which is one of the comparison objects, the test object 48 in which nylon 11 having a thickness of 1.00 mm is joined as a reinforcing material to a polyimide base material 12 having a thickness of 0.05 mm is gas permeable. When hydrogen gas (pressure: 0.5 MPa / temperature: 28.8 degrees Celsius) was injected for 2 hours in a state where it was loaded in the section 34, results of a permeation amount of 175 ppm and a permeation coefficient of 3,754 were obtained.

ここで「透過係数」とは、異なる条件下で実施された透過試験の結果を換算統一することにより、相互に比較し易くするための指標を意味する。透過係数の算定には様々な方式があるが、ここでは最も一般的に使用されている以下の式に基づいて透過係数(P)を算出した。
P=cc20μm/(m2・24hrs・atm)
因みにこの式は、厚さ:20μm、面積:1m2の試験対象に対し、1気圧で24時間加圧試験した場合の透過量を係数化するものである。
Here, the “permeability coefficient” means an index for facilitating comparison with each other by unifying the results of the transmission tests performed under different conditions. There are various methods for calculating the transmission coefficient. Here, the transmission coefficient (P) is calculated based on the following formula that is most commonly used.
P = cc 20μm / (m 2 · 24hrs · atm)
By the way, this equation is a coefficient for the amount of permeation when a pressure test is performed at 1 atm for 24 hours on a test object having a thickness of 20 μm and an area of 1 m 2 .

つぎに、試験番号N00の場合、厚さ1.00mmのナイロン11製基材12よりなる試験対象48をガス透過部34に装填した状態で、水素ガス(圧力:0.5MPa/温度:摂氏28.4度)を2時間注入したところ、透過量:275ppm、透過係数:6,194という結果が得られた。   Next, in the case of the test number N00, hydrogen gas (pressure: 0.5 MPa / temperature: 28 degrees Celsius) with the test object 48 made of the nylon 11 base material 12 having a thickness of 1.00 mm loaded in the gas permeation unit 34. .4 degrees) was injected for 2 hours, and the results were as follows: transmission amount: 275 ppm, transmission coefficient: 6,194.

試験番号A00の場合には、厚さ0.10mmのアルミニウム製基材12よりなる試験対象48をガス透過部34に装填した状態で、水素ガス(圧力:0.5MPa/温度:摂氏25.3度)を2時間注入したところ、透過量:2,395ppm、透過係数:5,137という結果が得られた。   In the case of test number A00, hydrogen gas (pressure: 0.5 MPa / temperature: 25.3 Celsius) with a test object 48 made of an aluminum substrate 12 having a thickness of 0.10 mm loaded in the gas permeation unit 34. When the injection rate was infused for 2 hours, the results were as follows: transmission amount: 2,395 ppm, transmission coefficient: 5,137.

試験番号P01の場合には、厚さ0.05mmのポリイミド製基材12の表面に、厚さ178nmのナノ積層DLC被膜(DLC構造:NL)10を被着形成し、さらに基材12の裏面に厚さ1.00mmのナイロン11を補強材として接合させた試験対象48をガス透過部34に装填した状態で、水素ガス(圧力:0.5MPa/温度:摂氏29.5度)を2時間注入したところ、透過量:30ppm、透過係数:676という結果が得られた。   In the case of test number P01, a nano-laminated DLC film (DLC structure: NL) 10 having a thickness of 178 nm is deposited on the surface of a polyimide substrate 12 having a thickness of 0.05 mm, and the back surface of the substrate 12 is further formed. 2 hours with hydrogen gas (pressure: 0.5 MPa / temperature: 29.5 degrees Celsius) in a state where the test object 48 in which nylon 11 having a thickness of 1.00 mm is bonded as a reinforcing material is loaded in the gas permeation section 34. When injected, the results were as follows: transmission amount: 30 ppm, transmission coefficient: 676.

また、試験番号N01の場合には、厚さ1.00mmのナイロン11製基材12の表面に、厚さ178nmのナノ積層DLC被膜10を被着形成した試験対象48をガス透過部34に装填した状態で、水素ガス(圧力:0.5MPa/温度:摂氏28.4度)を2時間注入したところ、透過量:25ppm、透過係数:536という結果が得られた。   In the case of test number N01, the gas permeation section 34 is loaded with a test object 48 in which a nano-laminated DLC coating 10 having a thickness of 178 nm is deposited on the surface of a nylon 12 substrate 12 having a thickness of 1.00 mm. In this state, hydrogen gas (pressure: 0.5 MPa / temperature: 28.4 degrees Celsius) was injected for 2 hours. As a result, a permeation amount of 25 ppm and a permeation coefficient of 536 were obtained.

以上の試験結果から、基材12の表面にナノ積層DLC被膜10を形成することにより、基材12のみで透過試験を実施した場合に比べて水素透過抑制効果が桁違いに向上するが、それでも完全な透過防止効果を奏するには至らないことが結論として導かれる。   From the above test results, by forming the nano-laminated DLC film 10 on the surface of the base material 12, the hydrogen permeation suppression effect is improved by orders of magnitude compared with the case where the permeation test is performed only with the base material 12, but still It can be concluded that it is not possible to achieve a complete anti-permeation effect.

つぎに、ポリイミド製の基材12の表面に、複合ナノ積層DLC被膜20を形成した場合の試験結果について考察する。
まず、試験番号P02-1の場合、厚さ0.05mmのポリイミド製基材12の表面に、厚さ178nmの複合ナノ積層DLC被膜(DLC構造:MS)20を被着形成し、さらに基材12の裏面に厚さ1.00mmのナイロン11を補強材として接合させた試験対象48をガス透過部34に装填した状態で、水素ガス(圧力:0.3MPa/温度:摂氏28.5度)を2時間注入したところ、透過量:0ppm、透過係数:0という良好な結果が得られた。
Next, the test results when the composite nano-laminated DLC coating 20 is formed on the surface of the polyimide substrate 12 will be considered.
First, in the case of test number P02-1, a composite nanolaminate DLC film (DLC structure: MS) 20 having a thickness of 178 nm is deposited on the surface of a polyimide substrate 12 having a thickness of 0.05 mm, and further the substrate Hydrogen gas (pressure: 0.3 MPa / temperature: 28.5 degrees Celsius) in a state where a test object 48 in which nylon 11 having a thickness of 1.00 mm is bonded to the back surface of 12 as a reinforcing material is loaded in the gas permeable portion 34. Was injected for 2 hours, and good results were obtained with a transmission amount of 0 ppm and a transmission coefficient of 0.

また、水素ガスの圧力を0.5MPaに上げた試験番号P02-2と、0.7MPaに上げた試験番号P02-3の場合においても同様に、透過量:0ppm、透過係数:0という結果が得られた。   Similarly, in the case of test number P02-2 where the pressure of hydrogen gas was increased to 0.5 MPa and test number P02-3 where the pressure of hydrogen gas was increased to 0.7 MPa, the results were as follows: permeation amount: 0 ppm, permeation coefficient: 0 Obtained.

以上の試験番号P02-1〜P02-3の結果から、ポリイミド製基材12+ナイロン11製補強材の上に複合ナノ積層DLC被膜20を形成したケースでは、ガス圧が0.3〜0.7に変化しても、完全な透過防止効果が得られることが確認できた。   From the results of the above test numbers P02-1 to P02-3, in the case where the composite nanolaminate DLC film 20 is formed on the polyimide base material 12 + nylon 11 reinforcing material, the gas pressure is 0.3 to 0.7. It was confirmed that even if it changed to, a complete transmission preventing effect was obtained.

つぎに、ナイロン11製の基材12の表面に、複合ナノ積層DLC被膜20を形成した場合の試験結果を考察する。
まず、試験番号N02の場合、厚さ1.00mmのナイロン11製基材12の表面に、厚さ178nmの複合ナノ積層DLC被膜20を被着形成した試験対象48をガス透過部34に装填した状態で、水素ガス(圧力:0.5MPa/温度:摂氏29.1度)を2時間注入したところ、透過量:25ppm、透過係数:536という結果が得られた。
Next, the test results when the composite nano-laminated DLC film 20 is formed on the surface of the base material 12 made of nylon 11 will be considered.
First, in the case of test number N02, a test object 48 in which a composite nanolaminate DLC film 20 having a thickness of 178 nm was deposited on the surface of a nylon 11 substrate 12 having a thickness of 1.00 mm was loaded into the gas permeable portion 34. In this state, hydrogen gas (pressure: 0.5 MPa / temperature: 29.1 degrees Celsius) was injected for 2 hours. As a result, a permeation amount of 25 ppm and a permeation coefficient of 536 were obtained.

このように、試験番号N02の場合には水素ガスの透過抑制効果がポリイミド製基材の場合(試験番号P02-1〜P02-3)に比べて劣るため、複合ナノ積層DLC被膜20の成膜時間を3倍に延ばし、その厚さを3倍の530nmとした上で試験を続行した。   Thus, in the case of test number N02, since the hydrogen gas permeation suppressing effect is inferior to that of the polyimide base material (test numbers P02-1 to P02-3), the composite nano-laminated DLC film 20 is formed. The test was continued after the time was increased to 3 times and the thickness was increased to 3 times 530 nm.

すなわち、試験番号N03-1の場合、厚さ1.00mmのナイロン11製基材12の表面に、厚さ530nmの複合ナノ積層DLC被膜20を被着形成した試験対象48をガス透過部34に装填した状態で、水素ガス(圧力:0.3MPa/温度:摂氏28.5度)を2時間注入したところ、透過量:0、透過係数:0という良好な結果が得られた。   That is, in the case of the test number N03-1, the test object 48 in which the composite nano-laminated DLC film 20 having a thickness of 530 nm is formed on the surface of the nylon 12 base material 12 having a thickness of 1.00 mm is used as the gas permeable portion 34. When hydrogen gas (pressure: 0.3 MPa / temperature: 28.5 degrees Celsius) was injected for 2 hours in the charged state, good results of permeation amount: 0 and permeation coefficient: 0 were obtained.

また、水素ガスの圧力を0.5MPaに上げた試験番号N03-2と、0.7MPaに上げた試験番号N03-3の場合においても、同様に透過量:0ppm、透過係数:0という結果が得られた。   Also, in the case of test number N03-2 where the pressure of hydrogen gas was increased to 0.5 MPa and test number N03-3 where the pressure of hydrogen gas was increased to 0.7 MPa, the results of the permeation amount: 0 ppm and the permeation coefficient: 0 were also obtained. Obtained.

以上の試験番号N03-1〜N03-3の結果から、ナイロン11製基材を用いた場合であっても、複合ナノ積層DLC被膜20の膜厚を530nmまで厚くすることにより、完全な透過防止効果が得られることが確認できた。   From the results of the above test numbers N03-1 to N03-3, even when a nylon 11 base material is used, complete permeation prevention can be achieved by increasing the thickness of the composite nanolaminate DLC film 20 to 530 nm. It was confirmed that the effect was obtained.

つぎに、アルミニウム製基材12の表面に、複合ナノ積層DLC被膜20を形成した場合の試験結果を考察する。
まず、試験番号A01の場合、厚さ0.10mmのアルミニウム製基材12の表面に、厚さ530nmの複合ナノ積層DLC被膜20を被着形成した試験対象48をガス透過部34に装填した状態で、水素ガス(圧力:0.5MPa/温度:摂氏24.4度)を2時間注入したところ、透過量:35ppm、透過係数:75という結果が得られた。
Next, the test results when the composite nano-laminated DLC film 20 is formed on the surface of the aluminum substrate 12 will be considered.
First, in the case of test number A01, a test object 48 in which a composite nano-layered DLC film 20 having a thickness of 530 nm is formed on the surface of an aluminum substrate 12 having a thickness of 0.10 mm is loaded in the gas permeation section 34. Then, when hydrogen gas (pressure: 0.5 MPa / temperature: 24.4 degrees Celsius) was injected for 2 hours, a result of a permeation amount of 35 ppm and a permeation coefficient of 75 was obtained.

このように、試験番号A01の場合には複合ナノ積層DLC被膜20の厚さが530nmあるにもかかわらず、水素ガスの透過抑制効果がナイロン11製基材の場合(試験番号N03-1〜N03-3)に比べて劣る結果となった。
この理由として、中間層18に構造上の問題があることが推測された。すなわち、アルミニウムのような金属製基材12の表面に複合ナノ積層DLC被膜20を形成する場合、上記の通り、両者間にクロム等の金属よりなる中間層18を形成する必要があるが、これまでは総エネルギー量180kws(500w×360秒)を投下し、単層で成膜していた。
Thus, in the case of test number A01, even though the thickness of the composite nanolaminate DLC film 20 is 530 nm, the permeation suppressing effect of hydrogen gas is a nylon 11 base material (test numbers N03-1 to N03). It was inferior to -3).
This is presumed that the intermediate layer 18 has a structural problem. That is, when the composite nano-laminated DLC film 20 is formed on the surface of the metal substrate 12 such as aluminum, it is necessary to form the intermediate layer 18 made of a metal such as chromium as described above. Until then, a total energy amount of 180 kws (500 w × 360 seconds) was dropped to form a single layer.

これに対し、下層、中層、上層の3層構造を備えたクロム製の中間層18を形成することで全体の硬度を高め、問題の解決を図ることとした。
この際、投下するエネルギー量を、下層で36kws(300w×120s)、中層で36kws(400w×90s)、上層で30kws(500w×60s)、合計で102kwsに設定し、単層の場合の180kwsよりも低く抑えることにより、3層構造を備えながらも全体の膜厚を16.5nmにとどめている。
In contrast, the chromium intermediate layer 18 having a three-layer structure of a lower layer, a middle layer, and an upper layer is formed to increase the overall hardness and solve the problem.
At this time, the amount of energy to be dropped is set to 36 kws (300 w × 120 s) in the lower layer, 36 kws (400 w × 90 s) in the middle layer, 30 kws (500 w × 60 s) in the upper layer, and a total of 102 kws, from 180 kws in the case of a single layer However, the total film thickness is limited to 16.5 nm while having a three-layer structure.

このような3層構造の中間層18を形成した複合ナノ積層DLC被膜20の試験結果として、試験番号A02-1の場合、厚さ0.10mmのアルミニウム製基材12の表面に、厚さ16.5nmの中間層18及び厚さ530nmの複合ナノ積層DLC被膜20を被着形成した試験対象48をガス透過部34に装填した状態で、水素ガス(圧力:0.3MPa/温度:摂氏17.4度)を2時間注入したところ、透過量:0、透過係数:0という期待通りの結果が得られた。   As a test result of the composite nanolaminate DLC film 20 in which the intermediate layer 18 having such a three-layer structure is formed, in the case of the test number A02-1, a thickness of 16 is formed on the surface of the aluminum substrate 12 having a thickness of 0.10 mm. In a state where the test object 48 on which the intermediate layer 18 having a thickness of 5 nm and the composite nanolaminate DLC film 20 having a thickness of 530 nm are deposited is loaded in the gas permeation portion 34, hydrogen gas (pressure: 0.3 MPa / temperature: 17. Celsius). 4 hours) was injected for 2 hours. As a result, an expected result that the transmission amount was 0 and the transmission coefficient was 0 was obtained.

また、水素ガスの圧力を0.5MPaに上げた試験番号A02-2と、0.7MPaに上げた試験番号A02-3の場合においても、同様に透過量:0ppm、透過係数:0という結果が得られた。   Similarly, in the case of test number A02-2 where the pressure of hydrogen gas was increased to 0.5 MPa and test number A02-3 where the pressure of hydrogen gas was increased to 0.7 MPa, the results of the permeation amount: 0 ppm and the permeation coefficient: 0 were obtained. Obtained.

以上の試験番号A02-1〜A02-3の結果から、アルミニウム製基材12の場合であっても、3層構造の中間層18を形成することにより、完全な透過防止効果が得られることが確認できた。
基材12をアルミニウム等の金属により構成した場合には、基材12の塑性変形による表面変位が生じ得るが、このような3層構造の中間層18を採用することにより、これが緩衝材としてうまく機能し、複合ナノ積層DLC被膜20にクラックが生じることを防止できたことが、成功の原因であると考えられる。
From the results of the above test numbers A02-1 to A02-3, even in the case of the aluminum substrate 12, the formation of the intermediate layer 18 having a three-layer structure can provide a complete transmission preventing effect. It could be confirmed.
When the base material 12 is made of a metal such as aluminum, surface displacement due to plastic deformation of the base material 12 may occur. By adopting the intermediate layer 18 having such a three-layer structure, this can be used as a cushioning material. It is considered that the reason for success was that it functioned and was able to prevent the composite nanolaminate DLC coating 20 from cracking.

上記においては、複合ナノ積層DLC被膜20を構成する第1のDLC薄膜14aと第2のDLC薄膜14bがそれぞれ等しい厚さを備えていることを前提としていたが、両者の膜厚を異ならせることもできる。
図6はその一例を示すものであり、より硬度の高い第1のDLC薄膜14aの方が、第2のDLC薄膜14bよりも厚く形成されている。
In the above description, it is assumed that the first DLC thin film 14a and the second DLC thin film 14b constituting the composite nano-laminated DLC film 20 have the same thickness. You can also.
FIG. 6 shows an example of this, and the first DLC thin film 14a having higher hardness is formed thicker than the second DLC thin film 14b.

また、上記においては基材12としてポリイミド、ナイロン11、アルミニウムを例示したが、他の金属やゴム、ポリマー等よりなる基材12の表面に、複合ナノ積層DLC被膜20を形成することも当然に可能である。   In the above, polyimide, nylon 11, and aluminum are exemplified as the base material 12. However, it is natural that the composite nano-laminated DLC film 20 is formed on the surface of the base material 12 made of other metal, rubber, polymer, or the like. Is possible.

また、複合ナノ積層DLC被膜20として、上部DLC被膜領域26、中部DLC被膜領域24、下部DLC被膜領域22の3つの領域に区分されているものを例示したが、相互に特性の異なる2つの領域、あるいは4つ以上の領域に区分されている複合ナノ積層DLC被膜を採用することも当然に可能である。   Further, the composite nano-laminated DLC coating 20 is illustrated as being divided into three regions of an upper DLC coating region 26, a middle DLC coating region 24, and a lower DLC coating region 22, but two regions having different characteristics from each other. Alternatively, it is naturally possible to employ a composite nanolaminate DLC film divided into four or more regions.

また、上記の複合ナノ積層DLC被膜20の場合、上部DLC被膜領域26、中部DLC被膜領域24、下部DLC被膜領域22のように、各領域の境界が明確に区画されていたが、この発明に係る水素透過防止被膜はこの構成に限定されるものではない。
図7にはその一例として、基材12の表面に形成された傾斜ナノ積層DLC被膜60が示されている。
この傾斜ナノ積層DLC被膜60の表面には、DLC薄膜よりなるトップコート16が形成されている。また、基材12がアルミニウム等の金属よりなる場合には、クロム等の金属よりなる中間層18が、複合ナノ積層DLC被膜60と基材12との間に形成される。
Further, in the case of the composite nano-laminated DLC film 20 described above, the boundaries of the respective regions were clearly defined as in the upper DLC film region 26, the middle DLC film region 24, and the lower DLC film region 22, Such a hydrogen permeation preventive coating is not limited to this configuration.
FIG. 7 shows, as an example, a gradient nano-stacked DLC film 60 formed on the surface of the substrate 12.
A top coat 16 made of a DLC thin film is formed on the surface of the inclined nano-stacked DLC film 60. When the substrate 12 is made of a metal such as aluminum, an intermediate layer 18 made of a metal such as chrome is formed between the composite nanolaminate DLC coating 60 and the substrate 12.

傾斜ナノ積層DLC被膜60は、多数のDLC薄膜を積層させた構造を備えており、かつ、各DLC薄膜の硬度や膜厚が基材12側からトップコート16側に向けて漸増または漸減するように構成されている。
このため、隣接するDLC薄膜相互間では僅かな特性差しか認められないが、傾斜ナノ積層DLC被膜60の上端と下端間では、明確な特性差が生じている。
The inclined nanolaminate DLC coating 60 has a structure in which a large number of DLC thin films are laminated, and the hardness and film thickness of each DLC thin film gradually increase or decrease from the substrate 12 side to the topcoat 16 side. It is configured.
For this reason, only a slight characteristic difference is recognized between adjacent DLC thin films, but there is a clear characteristic difference between the upper end and the lower end of the inclined nanolaminate DLC film 60.

ナノ積層DLC被膜及び複合ナノ積層DLC被膜の構造を示す模式図である。It is a schematic diagram which shows the structure of a nano lamination | stacking DLC film and a composite nano lamination | stacking DLC film. 第1のDLC薄膜及び第2のDLC薄膜を示す拡大図である。It is an enlarged view which shows a 1st DLC thin film and a 2nd DLC thin film. 複合ナノ積層DLC被膜を構成する上部DLC被膜領域、中部DLC被膜領域、下部DLC被膜領域の特性及び成膜条件を示す一覧表である。It is a table | surface which shows the characteristic and film-forming conditions of the upper DLC film area which comprises a composite nano lamination | stacking DLC film, a middle part DLC film area, and a lower DLC film area. 試験装置の構成を示す断面図である。It is sectional drawing which shows the structure of a test apparatus. 試験対象、試験条件、試験結果を示す一覧表である。It is a table | surface which shows a test object, test conditions, and a test result. 第1のDLC薄膜及び第2のDLC薄膜を示す拡大図である。It is an enlarged view which shows a 1st DLC thin film and a 2nd DLC thin film. 傾斜ナノ積層DLC被膜の構造を示す模式図である。It is a schematic diagram which shows the structure of the inclination nano lamination | stacking DLC film.

10 ナノ積層DLC被膜
12 基材
14 DLC薄膜
14a 第1のDLC薄膜
14b 第2のDLC薄膜
16 トップコート
18 中間層
20 複合ナノ積層DLC被膜
22 下部DLC被膜領域
24 中部DLC被膜領域
26 上部DLC被膜領域
30 試験装置
32 ガス導入管
34 ガス透過部
36 ガス排出管
38 検知器
40 外部フランジ
42 内部フランジ
44 シーリングガスケット
46 フィルタ
48 試験対象
50 ボルト
52 ナット
60 傾斜ナノ積層DLC被膜
10 Nano-laminated DLC coating
12 Base material
14 DLC thin film
14a First DLC thin film
14b Second DLC thin film
16 Top coat
18 Middle layer
20 Composite nano-laminated DLC coating
22 Lower DLC coating area
24 Central DLC coating area
26 Upper DLC coating area
30 test equipment
32 Gas inlet pipe
34 Gas permeation section
36 Gas exhaust pipe
38 Detector
40 External flange
42 Internal flange
44 Sealing gasket
46 Filter
48 subjects
50 volts
52 Nut
60 Graded nano-stacked DLC coating

Claims (5)

ナイロン11よりなる基材の表面に、ナノレベルの膜厚のDLC薄膜を複数積層させたナノ積層DLC被膜よりなる水素透過防止被膜であって、
上記ナノ積層DLC被膜が、相互に硬度の異なる複数の領域に区分された複合ナノ積層DLC被膜よりなり、
各領域が、それぞれ硬度の異なる2種類のDLC薄膜を交互に積層させた構造を備えており、
さらに、上記複合ナノ積層DLC被膜全体の厚さが530nm以上であることを特徴とする水素透過防止被膜。
A hydrogen permeation preventive coating comprising a nano-laminated DLC coating in which a plurality of nano-level DLC thin films are laminated on the surface of a base material made of nylon 11 ,
The nano-laminated DLC film is composed of a composite nano-laminated DLC film divided into a plurality of regions having different hardnesses from each other,
Each region has a structure in which two types of DLC thin films having different hardnesses are alternately laminated,
Further, the hydrogen permeation preventive coating, wherein the total thickness of the composite nano-laminated DLC coating is 530 nm or more.
ポリイミドよりなる基材の表面に、ナノレベルの膜厚のDLC薄膜を複数積層させたナノ積層DLC被膜よりなる水素透過防止被膜であって、
上記ナノ積層DLC被膜が、相互に硬度の異なる複数の領域に区分された複合ナノ積層DLC被膜よりなり、
各領域が、それぞれ硬度の異なる2種類のDLC薄膜を交互に積層させた構造を備えており、
さらに、上記複合ナノ積層DLC被膜全体の厚さが178nm以上であることを特徴とする水素透過防止被膜。
A hydrogen permeation preventive coating comprising a nano-laminated DLC coating in which a plurality of nano-level DLC thin films are laminated on the surface of a substrate made of polyimide,
The nano-laminated DLC film is composed of a composite nano-laminated DLC film divided into a plurality of regions having different hardnesses from each other,
Each region has a structure in which two types of DLC thin films having different hardnesses are alternately laminated,
Further, the hydrogen permeation preventive coating, wherein the total thickness of the composite nano-laminated DLC coating is 178 nm or more.
アルミニウムよりなる基材の表面に、ナノレベルの膜厚のDLC薄膜を複数積層させたナノ積層DLC被膜よりなる水素透過防止被膜であって、
上記ナノ積層DLC被膜が、相互に硬度の異なる複数の領域に区分された複合ナノ積層DLC被膜よりなり、
各領域が、それぞれ硬度の異なる2種類のDLC薄膜を交互に積層させた構造を備えており、
また、上記複合ナノ積層DLC被膜全体の厚さが530nm以上であり、
さらに、上記複合ナノ積層DLC被膜と基材との間に、3層の金属被膜を積層させた構造の中間層が形成されていることを特徴とする水素透過防止被膜。
A hydrogen permeation preventive coating comprising a nano-laminated DLC coating in which a plurality of nano-level DLC thin films are laminated on the surface of a substrate made of aluminum ,
The nano-laminated DLC film is composed of a composite nano-laminated DLC film divided into a plurality of regions having different hardnesses from each other,
Each region has a structure in which two types of DLC thin films having different hardnesses are alternately laminated,
The total thickness of the composite nano-laminated DLC film is 530 nm or more,
Furthermore, an intermediate layer having a structure in which three metal coatings are laminated is formed between the composite nano-laminated DLC coating and the base material.
上記複合ナノ積層DLC被膜が3つの領域に区分されており、
中間に位置する領域の硬度が最も高く設定されていることを特徴とする請求項1〜3の何れかに記載の水素透過防止被膜。
The composite nano-laminated DLC film is divided into three regions,
The hydrogen permeation preventive coating according to any one of claims 1 to 3, wherein the hardness of the region located in the middle is set to be the highest.
上記硬度の異なる2種類のDLC薄膜の中、硬度の高い方のDLC薄膜の膜厚を、他方のDLC薄膜の膜厚よりも厚く形成したことを特徴とする請求項1〜4の何れかに記載の水素透過防止被膜。   5. The DLC thin film having a higher hardness among the two types of DLC thin films having different hardnesses is formed to be thicker than the film thickness of the other DLC thin film. The hydrogen permeation preventive coating described.
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