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JPS5940792B2 - Method for surface metallization of metal oxides - Google Patents
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JPS5940792B2 - Method for surface metallization of metal oxides - Google Patents

Method for surface metallization of metal oxides

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Publication number
JPS5940792B2
JPS5940792B2 JP10129180A JP10129180A JPS5940792B2 JP S5940792 B2 JPS5940792 B2 JP S5940792B2 JP 10129180 A JP10129180 A JP 10129180A JP 10129180 A JP10129180 A JP 10129180A JP S5940792 B2 JPS5940792 B2 JP S5940792B2
Authority
JP
Japan
Prior art keywords
titanium
metal oxide
metal
alloy
temperature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
JP10129180A
Other languages
Japanese (ja)
Other versions
JPS5727985A (en
Inventor
修 木村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tohoku Kinzoku Kogyo KK
Original Assignee
Tohoku Kinzoku Kogyo KK
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tohoku Kinzoku Kogyo KK filed Critical Tohoku Kinzoku Kogyo KK
Priority to JP10129180A priority Critical patent/JPS5940792B2/en
Publication of JPS5727985A publication Critical patent/JPS5727985A/en
Publication of JPS5940792B2 publication Critical patent/JPS5940792B2/en
Expired legal-status Critical Current

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  • Other Surface Treatments For Metallic Materials (AREA)

Description

【発明の詳細な説明】 本発明は金属酸化物の表面金属化方法に関する。[Detailed description of the invention] The present invention relates to a method for surface metallization of metal oxides.

金属酸化物の表面を金属化せしめることは該金属酸化物
と金属との接合固定を容易ならしめることにおいて重要
な課題である。従来金属酸化物製品例えばフェライト振
動子を他の金属体と接合固定するような場合、エポキシ
系などの有機接着剤が用いられていた。
Metallizing the surface of a metal oxide is an important issue in making it easier to bond and fix the metal oxide and metal. Conventionally, organic adhesives such as epoxy-based adhesives have been used to bond metal oxide products such as ferrite resonators to other metal bodies.

しかしこの様な接着剤は高温や振動には弱<接着部分力
禄!1離するという不具合が発生しやすい。一方、金属
酸化物の表面を金属化して鑞付けによつて他の金属体と
接合固定することも行なわれる。
However, such adhesives are weak against high temperatures and vibrations. It is easy for the problem of 1 separation to occur. On the other hand, the surface of the metal oxide is metallized and the metal oxide is bonded and fixed to another metal body by brazing.

この場合金属酸化物の表面金属化法としてMo−Mn法
が知られている。この方法は、MoとMnの粉末を金属
酸化物の表面上に塗布し、水素雰囲気中で焼結し、さら
にその上にニッケルメッキを行なつた上拡散処理して金
属化表面を得ている。しかしながら、このMo−Mn法
では焼結温度が1400〜1500℃と高く、また工程
が複雑である。また、金属酸化物同志を鑞付けする方法
として、金属酸化物の鑞付け面を与め金属化する工程を
取らず、チタン箔と、鑞材(Ag、Cu、Ni、あるい
はそれらの合金)の箔とを、鑞付けしたい金属酸化物同
志の間に挾み込み、900〜950℃に加熱して鑞付け
することが行なわれている。
In this case, the Mo-Mn method is known as a method for surface metallization of metal oxides. In this method, Mo and Mn powder is applied onto the surface of a metal oxide, sintered in a hydrogen atmosphere, and then nickel plated and diffused to obtain a metallized surface. . However, in this Mo-Mn method, the sintering temperature is as high as 1400 to 1500°C, and the process is complicated. In addition, as a method for brazing metal oxides together, titanium foil and brazing material (Ag, Cu, Ni, or alloys thereof) are used, without the step of providing a metal oxide brazing surface and metallizing. The foil is sandwiched between metal oxides to be brazed and brazed by heating to 900 to 950°C.

これは活性金属法と呼ばれており、この方法で鑞付けが
行なわれる機構は完全には解明されていない。本発明は
、その機構を解明する段階で明らかになつた事実にもと
づいてなされたものである。上記のチタン箔と鑞材の箔
とを用いる鑞付け作業では、加熱中にTiが金属酸化物
を還元し、この還元された金属と鑞材とが合金を形成す
るものと考えられる。Tiの酸素吸収能力、即ち還元性
は、その相変態温度以上で急に大きくなることは例えば
、モートン(P、H、Morton)のデータ(溶接学
会編、溶接便覧、昭和41年2月、第861頁、図48
.4とその説明参照)等で明らかとなつている。
This is called the active metal method, and the mechanism by which brazing is performed by this method is not completely understood. The present invention was made based on the facts that became clear at the stage of elucidating the mechanism. It is believed that in the brazing operation using the titanium foil and the brazing material foil described above, Ti reduces the metal oxide during heating, and the reduced metal and the brazing material form an alloy. For example, the data of Morton (P, H, Morton) (edited by the Welding Society of Japan, Welding Handbook, February 1966, Vol. Page 861, Figure 48
.. 4 and its explanation).

従つて、本発明者は金属酸化物の表面を金属化するには
、Tiを金属酸化物表面に接触させて加熱すれば良いと
考え、そのような実験を行なつたところ、金属酸化物表
面にまだらなTiO3膜が形成されてしまい表面金属化
は不可能であることを見出した。
Therefore, the inventor thought that in order to metallize the surface of a metal oxide, it would be sufficient to bring Ti into contact with the metal oxide surface and heat it, and when conducting such an experiment, it was found that the surface of the metal oxide It was discovered that a mottled TiO3 film was formed and surface metallization was impossible.

そこで本発明者は、チタンと銀ろうとの合金を形成しこ
れを金属酸化物表面に接触させて加熱したところ、チタ
ンの相変態温度近傍の温度で、金属酸化物表面が還元さ
れ、成分金属が露出することを見出した。
Therefore, the inventor formed an alloy of titanium and silver solder, brought it into contact with the metal oxide surface, and heated it. At a temperature near the phase transformation temperature of titanium, the metal oxide surface was reduced, and the component metals were reduced. I found that I was exposed.

しかもこの場合、接触されたチタンと銀ろうとの合金は
被処理物から容易に剥離された。本発明は、上記のよう
な、新たな知見にもとづいてなされたものである。
Furthermore, in this case, the alloy of titanium and silver solder that was in contact was easily peeled off from the workpiece. The present invention has been made based on the above-mentioned new findings.

本発明の目的は、比較的低温でかつ簡単な工程5で金属
酸化物の表面を金属化する方法を提供することを目的と
し、これにより金属酸化物と他の金属との鑞付けや半田
付けを可能にするものである。
An object of the present invention is to provide a method for metallizing the surface of a metal oxide at a relatively low temperature and in a simple process 5, which enables brazing and soldering of the metal oxide and other metals. This is what makes it possible.

本発明は、銅とチタンあるいは銀ろうとチタンとの合金
を用意し、表面金属化したい金属酸化物の表面にこのチ
タン合金を接触させ、この状態で非酸化性雰囲気中にて
チタンの相変態点近傍の温度(750〜950゜C)に
加熱し、これによつて、該金属酸化物の表面層の酸化金
属をチタンで還元するようにして金属酸化物の表面を金
属化するものである。なト、ここで対象とする金属酸化
物の金属は酸素との親和力がチタンより小さい金属であ
ることは言う迄もない。
In the present invention, an alloy of copper and titanium or a silver solder and titanium is prepared, this titanium alloy is brought into contact with the surface of a metal oxide to be surface metallized, and in this state, the phase transformation point of titanium is reached in a non-oxidizing atmosphere. The surface of the metal oxide is metallized by heating to a temperature in the vicinity of 750 to 950 degrees Celsius, thereby reducing the metal oxide in the surface layer of the metal oxide with titanium. It goes without saying that the metal oxide of interest here has a smaller affinity for oxygen than titanium.

前述のように、チタンはその相変態点(885℃)二温
度以上にむいて酸素吸収納力が極端に大きくなつている
As mentioned above, titanium's oxygen absorption capacity becomes extremely large at temperatures above its phase transformation point (885° C.).

一方チタンの融点は1675℃と高いが、銀との共晶点
が855℃で、銅との共晶点が880とCであるので、
銀ろうや銅との合金にすることによつて融点をトげるこ
とができ、750〜 冫950℃で軟化し易くなる。従
つて不発明の方法では、チタンの合金が、その酸素吸収
能力の極端に大きな相変態点近傍の温度で被処理物であ
る金属酸化物表面に接触し易くなり、この結果、活性化
したチタンの方へ金属酸化物中の酸素が拡散して吸収さ
れるので、酸化金属がチタンによつて還元され、金属酸
化物表面が金属化される。以ト本発明をフエライト振動
子の放射面と側面の一部を金属化する場合に適用した実
施例を図面を参照して詳細に説明する。
On the other hand, titanium has a high melting point of 1675°C, but its eutectic point with silver is 855°C and its eutectic point with copper is 880°C.
By alloying it with silver solder or copper, the melting point can be raised, making it easier to soften at temperatures of 750 to 950°C. Therefore, in the uninvented method, the titanium alloy easily contacts the surface of the metal oxide to be treated at a temperature close to its phase transformation point, where its oxygen absorption capacity is extremely large, and as a result, activated titanium Since oxygen in the metal oxide diffuses and is absorbed toward the titanium, the metal oxide is reduced by titanium, and the surface of the metal oxide is metallized. DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to metallizing a part of the radiation surface and side surfaces of a ferrite vibrator will be described in detail with reference to the drawings.

まず、チタンと銀ろう(Ag35wt%、Cu37wt
%、Zn28wt%で融点 780℃)の合金粒子を形成した。
First, titanium and silver solder (Ag35wt%, Cu37wt%
%, Zn28wt% and melting point 780°C) were formed.

実際には、スポンジ状の(即ち多孔性の)チタン粒子と
上記銀ろうの箔小片とを7対3の割合で混合して、アル
・ゴン雰囲気中にて920℃に10分間保持した。これ
によつて、銀ろうがスポンジ状のチタンの各粒子に吸収
され、銀ろうと合金化されたチタン粒子を得た。この銀
ろうとチタンの合金粒子1を第1図に示すように耐火容
器2の中に充填し、Ni−Znフエライト振動子3の表
面金属化したい部分を、この合金粒子充填中に埋め込ん
だ。
In practice, spongy (i.e., porous) titanium particles and the silver solder foil pieces were mixed in a ratio of 7:3 and held at 920° C. for 10 minutes in an argon atmosphere. As a result, the silver solder was absorbed into each spongy titanium particle to obtain titanium particles alloyed with the silver solder. The alloy particles 1 of silver solder and titanium were filled in a fireproof container 2 as shown in FIG. 1, and the portion of the Ni--Zn ferrite vibrator 3 whose surface was to be metallized was embedded in the alloy particles.

この状態で、アルゴン雰囲気中にて870℃に20分間
保持した。かくして処理された振動子3は、合金粒子充
填層中に埋め込まれていた部分の表面、即ち、第2図に
斜線で示された領域4と振動放射面が白色を呈し、地金
のニツケル粒子が表面に露出していることを示した。即
ち、振動子3の表面が金属化された。ニツケルが表面に
露出していることはX線回折で確認された。また、この
表面の比抵抗を測定したところ、1Ω一?以であつた。
これは、Nl−Znフエライトの表面の比抵抗は通常1
00KΩ−?以上を示すことを考慮すると比抵抗の大幅
な減少を意味し、また半田付けや鑞付けは10Ω−?以
下であれば容易に行なえることから、良好な金属化であ
ることを示している。比較的低温で、しη)も簡単な処
理で上述のような良好な金属化が行なわれる理由は以ト
のとむりと考えられる。銀ろうと合金化されたスポンジ
状チタン粒子は、その融点は低くなつており、その表面
は共晶点である約850℃程度となつている。従つて、
870℃の加熱によつて、このチタン合金が軟化して被
処理体のフエライト表面に良く接触するようになる。即
ち良く濡れる。実際には、チタン粒子全体は溶けてしま
わないが、表面が一部溶け出しているものと考えられる
。一方、この870゜Cという温度はチタンの相変態温
度(885゜C)近傍にあり、この温度では、前述した
ようにチタンの酸素吸収能力は極めて高い。それ故、チ
タン合金に接触しているフエライト表面のニツケル酸化
物が還元され、ニツケルが表面に露出することになる。
ここで重要なことは、被処理体表面にはチタン合金は溶
着していないことである。
In this state, the temperature was maintained at 870° C. for 20 minutes in an argon atmosphere. In the vibrator 3 treated in this way, the surface of the portion embedded in the alloy particle packed layer, that is, the area 4 indicated by diagonal lines in FIG. was exposed on the surface. That is, the surface of the vibrator 3 was metallized. It was confirmed by X-ray diffraction that nickel was exposed on the surface. Also, when I measured the specific resistance of this surface, I found it to be 1Ω. So it was.
This means that the specific resistance of the surface of Nl-Zn ferrite is usually 1.
00KΩ-? Considering the above, it means a significant decrease in resistivity, and soldering or brazing is 10Ω-? If the metallization is less than or equal to 100%, it can be easily performed, which indicates that the metallization is good. The reason why the above-mentioned good metallization can be achieved at a relatively low temperature and by a simple process is considered to be as follows. Sponge-like titanium particles alloyed with silver solder have a low melting point, and the surface temperature is about 850° C., which is the eutectic point. Therefore,
By heating at 870° C., this titanium alloy is softened and comes into good contact with the ferrite surface of the object to be treated. In other words, it gets wet well. In reality, the entire titanium particle does not melt, but it is thought that some of the surface of the titanium particle melts. On the other hand, this temperature of 870° C. is near the phase transformation temperature of titanium (885° C.), and at this temperature, titanium has an extremely high oxygen absorption ability as described above. Therefore, the nickel oxide on the ferrite surface that is in contact with the titanium alloy is reduced, and nickel is exposed on the surface.
What is important here is that no titanium alloy is welded to the surface of the object to be treated.

処理終了後、被処理体表面にうす皮が付看するが、手で
容易に剥離できる。また表面金属は、被処理体としての
フエライトの金属が露出しているのであつて、他の金属
膜をフエライト表面上に付加形成したものではない。
After the treatment is finished, a thin layer of skin remains on the surface of the object to be treated, but it can be easily peeled off by hand. Further, the surface metal is the exposed metal of the ferrite as the object to be treated, and is not formed by additionally forming another metal film on the ferrite surface.

なち・、金属化のための加熱は、チタンを活性化し、酸
素吸収能力を大きくする一方、チタン合金が被処理物表
面に良く濡れるようにするためのものであるから、チタ
ン合金を完全に溶かす温度に迄加熱する必要はない。従
つて、上記実施例のような870℃に限定されるもので
はなく、チタンの相変態温度近傍の750〜950℃の
間で良い。第3図は、この加熱温度と得られた表面比抵
抗と 3の関係を示す。また、金属化のための加熱処理
の際の雰囲気はアルゴン雰囲気に限るものではなく、一
般に非酸化件雰囲気であれば良い。
In other words, heating for metallization activates titanium and increases its oxygen absorption capacity, while also allowing the titanium alloy to wet the surface of the workpiece. There is no need to heat it to melting temperature. Therefore, the temperature is not limited to 870°C as in the above embodiment, but may be between 750 and 950°C, which is near the phase transformation temperature of titanium. FIG. 3 shows the relationship between this heating temperature and the obtained surface resistivity. Furthermore, the atmosphere during the heat treatment for metallization is not limited to an argon atmosphere, but may generally be any non-oxidizing atmosphere.

上記実施例では金属酸化物としてZn−Niフエライト
の場合について示したが、本発明は、酸素との親和力が
チタンより小さな金属の酸化物に対して適用可能である
ことは言う迄もない。
In the above embodiment, Zn--Ni ferrite was used as the metal oxide, but it goes without saying that the present invention is applicable to metal oxides that have a smaller affinity for oxygen than titanium.

そのような金属の例としては、F.D.Richads
OnandJ.H.E.Jeffes,.I.rOnS
teelInst−ラ!160,261(1948)の
論文にむけるFig.lに示される酸化物の標準生成自
由エネルギーと温度との関係を示すグラフから明らかな
ように、実施例にち・ける、Fe,Ni,Znの外に、
Cu,Pb,Sn,CO,K,,Na,Mn,Cr,】
Si等が挙げられる。上述のように、本発明はチタンの
酸素吸収能力が比較的低温であるその相変態点(885
℃)近傍で極めて大きいことに看目し、その相変態点近
傍でチタンが軟化して被処理体表面に良く接触するよう
にチタンとの共晶点がこの温度近傍にある金属即ち銅や
銀ろうをチタンに吸収させ合金を作り、このチタン合金
を金属酸化物に接触させてチタンの相変態点近傍の温度
でチタンに金属酸化物の酸素を吸収可能としたもので、
これにより比較的低温でしかも簡単な工程で良好な表面
金属化が行なえるようになつた。
Examples of such metals include F. D. Richards
OnandJ. H. E. Jeffes,. I. rOnS
tealInst-La! Fig. 160, 261 (1948). As is clear from the graph showing the relationship between standard free energy of formation of oxides and temperature shown in 1, in addition to Fe, Ni, and Zn,
Cu, Pb, Sn, CO, K,, Na, Mn, Cr,]
Examples include Si. As mentioned above, the present invention shows that the oxygen absorption capacity of titanium is lower than its phase transformation point (885
℃), metals such as copper and silver whose eutectic point with titanium is near this temperature are used so that titanium softens near its phase transformation point and makes good contact with the surface of the workpiece. An alloy is created by absorbing wax into titanium, and this titanium alloy is brought into contact with a metal oxide, allowing the titanium to absorb oxygen from the metal oxide at a temperature near the phase transformation point of titanium.
This has made it possible to achieve good surface metallization at relatively low temperatures and in a simple process.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は、本発明の一実施例の金属化工程の状態を示す
断面図、第2図は、処理されたフエライト振動子の斜視
図、第3図は、処理温度と表面比抵抗との関係を示すグ
ラフである。 1・・・・・・チタン合金粒子、2・・・・・・耐火容
器、3・・・・・・フエライト振動子。
FIG. 1 is a cross-sectional view showing the state of the metallization process in an embodiment of the present invention, FIG. 2 is a perspective view of a treated ferrite resonator, and FIG. 3 is a graph showing the relationship between treatment temperature and surface resistivity. It is a graph showing a relationship. 1... Titanium alloy particles, 2... Fireproof container, 3... Ferrite vibrator.

Claims (1)

【特許請求の範囲】[Claims] 1 銅とチタンあるいは銀ろうとチタンの合金を用意し
、表面金属化したい金属酸化物(ただし、金属としては
酸素との親和力がチタンより小さいもの)の表面に該チ
タン合金を接触させ、非酸化性雰囲気中でチタンの相変
態点近傍の温度に加熱し、これによつて該金属酸化物の
表面層の酸化金属をチタンで還元するようにしたことを
特徴とする金属酸化物の表面金属化方法。
1 Prepare an alloy of copper and titanium or silver solder and titanium, and bring the titanium alloy into contact with the surface of the metal oxide that you want to surface metallize (however, as a metal, it has a smaller affinity for oxygen than titanium), and then A method for surface metallization of a metal oxide, which comprises heating in an atmosphere to a temperature near the phase transformation point of titanium, thereby reducing the oxidized metal in the surface layer of the metal oxide with titanium. .
JP10129180A 1980-07-25 1980-07-25 Method for surface metallization of metal oxides Expired JPS5940792B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10129180A JPS5940792B2 (en) 1980-07-25 1980-07-25 Method for surface metallization of metal oxides

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10129180A JPS5940792B2 (en) 1980-07-25 1980-07-25 Method for surface metallization of metal oxides

Publications (2)

Publication Number Publication Date
JPS5727985A JPS5727985A (en) 1982-02-15
JPS5940792B2 true JPS5940792B2 (en) 1984-10-02

Family

ID=14296735

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10129180A Expired JPS5940792B2 (en) 1980-07-25 1980-07-25 Method for surface metallization of metal oxides

Country Status (1)

Country Link
JP (1) JPS5940792B2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6163503A (en) * 1984-09-04 1986-04-01 Osamu Kimura Method of surface metallizing of metal oxide using fine powder titanium alloy
JPH0747515B2 (en) * 1986-09-25 1995-05-24 京セラ株式会社 Metallizing composition
DE102016220082B4 (en) * 2016-10-14 2026-04-30 Würth Elektronik eiSos Gmbh & Co. KG Method for metallizing ferrite ceramics and components with a ferrite ceramic

Also Published As

Publication number Publication date
JPS5727985A (en) 1982-02-15

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