JPH0610455B2 - piston ring - Google Patents
piston ringInfo
- Publication number
- JPH0610455B2 JPH0610455B2 JP59218588A JP21858884A JPH0610455B2 JP H0610455 B2 JPH0610455 B2 JP H0610455B2 JP 59218588 A JP59218588 A JP 59218588A JP 21858884 A JP21858884 A JP 21858884A JP H0610455 B2 JPH0610455 B2 JP H0610455B2
- Authority
- JP
- Japan
- Prior art keywords
- piston ring
- chromium
- coating layer
- sample
- test
- 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 - Lifetime
Links
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 31
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical group [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 30
- 239000011651 chromium Substances 0.000 claims description 28
- 229910052804 chromium Inorganic materials 0.000 claims description 27
- 239000011247 coating layer Substances 0.000 claims description 21
- 229910052757 nitrogen Inorganic materials 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 3
- 239000000523 sample Substances 0.000 description 25
- 239000000463 material Substances 0.000 description 16
- 239000010410 layer Substances 0.000 description 9
- 230000013011 mating Effects 0.000 description 8
- 238000007747 plating Methods 0.000 description 8
- 238000007733 ion plating Methods 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 238000000576 coating method Methods 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 5
- 229910001873 dinitrogen Inorganic materials 0.000 description 5
- 239000002345 surface coating layer Substances 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 4
- 238000000151 deposition Methods 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 4
- 150000004767 nitrides Chemical class 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 3
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 3
- 238000002441 X-ray diffraction Methods 0.000 description 3
- CXOWYMLTGOFURZ-UHFFFAOYSA-N azanylidynechromium Chemical compound [Cr]#N CXOWYMLTGOFURZ-UHFFFAOYSA-N 0.000 description 3
- 239000010953 base metal Substances 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 230000008021 deposition Effects 0.000 description 3
- 239000010687 lubricating oil Substances 0.000 description 3
- 239000010936 titanium Substances 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- 238000007740 vapor deposition Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010894 electron beam technology Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005019 vapor deposition process Methods 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910000639 Spring steel Inorganic materials 0.000 description 1
- 229910000808 amorphous metal alloy Inorganic materials 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- SJKRCWUQJZIWQB-UHFFFAOYSA-N azane;chromium Chemical compound N.[Cr] SJKRCWUQJZIWQB-UHFFFAOYSA-N 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
- 238000005240 physical vapour deposition Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
- F16J9/26—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction characterised by the use of particular materials
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Description
【発明の詳細な説明】 〔発明の属する技術分野〕 この発明は、ピストンリングに関し、更に詳しくは耐焼
き付き特性と耐摩耗特性とが改善された内燃機関用ピス
トンリングに関する。Description: TECHNICAL FIELD The present invention relates to a piston ring, and more particularly to a piston ring for an internal combustion engine having improved seizure resistance and wear resistance.
往復動内燃機関に使用されるピストンリングには高度な
耐摩耗特性が要求させる。それ故、ピストンリングに耐
摩耗特性を付与することを目的として、摺動面に硬質ク
ロムめっき層を形成させたピストンリングが内燃機関用
ピストンリングとして従来から多用されている。Piston rings used in reciprocating internal combustion engines require high wear resistance. Therefore, for the purpose of imparting wear resistance to the piston ring, a piston ring having a hard chromium plating layer formed on the sliding surface has been widely used as a piston ring for an internal combustion engine.
ところで、近年、内燃機関がますます高速化、高出力化
する趨勢にあり、したがって、ピストンリングの使用条
件もますます過酷なものとなってきており、従来のクロ
ムめっき層を有するピストンリングでは耐摩耗特性や耐
食性が充分ではない場合があり、更に優れた耐摩耗耐焼
き付き特性を有するピストンリングが望まれている。By the way, in recent years, internal combustion engines are becoming faster and higher in power, and therefore the usage conditions of the piston ring are becoming more and more severe. In some cases, the wear characteristics and the corrosion resistance are not sufficient, and there is a demand for a piston ring having further excellent wear resistance and seizure resistance.
それ故、ピストンリングの耐摩耗耐焼き付き特性等を更
に改善するための努力が払われており、摺動面にイオン
プレーティング法により金属の窒化物あるいは炭化物の
皮膜を形成させたピストンリングも提案されている(特
開昭５７−５７８６８号及び特開昭５７−６５８３７
号)。Therefore, efforts are being made to further improve the wear resistance and seizure resistance of the piston ring, and a piston ring with a metal nitride or carbide film formed on the sliding surface by the ion plating method is also proposed. (JP-A-57-57868 and JP-A-57-65837).
issue).
しかしながら、金属の窒化物や炭化物の皮膜は硬質クロ
ムめっき層に比べて優れた耐摩耗耐焼き付き特性を示す
ものではあるが、窒化物や炭化物は高度が高く柔軟性に
欠け、その上、熱膨脹係数が金属のそれに比べて著しく
小さいために、金属母材との密着性が悪く、特に応力の
作用状態の下で使用されるピストンリングの摺動面層と
してこれらの窒化物や炭化物層を形成する場合には機関
の運転中にリング母材から剥離を生じ易いという問題が
あり、実用に供されるには到っていない。However, although metal nitride and carbide coatings have superior wear resistance and seizure resistance compared to hard chrome plating layers, nitrides and carbides have high altitude and lack flexibility, and in addition they have a coefficient of thermal expansion. Is much smaller than that of metal, so the adhesion to the metal base material is poor, and these nitride and carbide layers are formed as the sliding surface layer of the piston ring used especially under the action of stress. In this case, there is a problem that peeling easily occurs from the ring base material during the operation of the engine, and it has not been put to practical use.
また、イオンプレーティング法による上記被膜の形成は
被膜の生成速度が遅く、充分な厚さの被覆膜を形成する
には長時間を要するので生産上難があり実用に供し得る
ものではない。Further, the formation of the above-mentioned coating by the ion plating method is slow in the production rate of the coating, and it takes a long time to form a coating having a sufficient thickness, which is difficult to produce and cannot be put to practical use.
この発明は、上記に鑑み、従来の問題点を解消し、過酷
な使用条件下においても充分な耐摩耗耐焼き付き特性を
示すピストンリングを提供することを目的としたなされ
たものである。In view of the above, the present invention has been made with the object of solving the problems of the prior art and providing a piston ring exhibiting sufficient wear and seizure resistance even under severe operating conditions.
この発明は、ピストンリングの少なくとも一つの摺動面
に、クロムと窒素を組成とする非晶質でなる被覆層を形
成さることにより、前記の目的を達成する。The present invention achieves the above object by forming an amorphous coating layer having a composition of chromium and nitrogen on at least one sliding surface of a piston ring.
なお、本発明のピストンリングの被覆層は、PVD法、好
ましくは減圧された窒素ガス雰囲気中で金属クロムを蒸
着させる反応性イオンプレーティング法を利用し、窒素
ガス分圧を0.2〜0.7×１０-3torrとし、ピストンリング
素材を２５０℃以下の温度に保持し、金属クロムの蒸着
過程で該クロムと窒素とを組成とする非晶質とし形成す
ることができる。本発明において、被覆層を構成する成
分をクロムと窒素とした理由は、反応性イオンプレーテ
ィング法により母材金属表面に形成されるクロムの該母
材金属との密着性が良好であり、また、その熱膨張係数
が該母材金属のそれに近く、したがって、ピストンリン
グの使用中に被覆層が該金属母材から剥離することが防
止できるためである。また、本発明で被覆層構成成分と
して特にクロムを採用する他の理由は、イオンプレーテ
ィング法による金属クロムの蒸着速度が他の金属のそれ
よりも大であり、生産性の観点からきわめて有効である
ためである。The coating layer of the piston ring of the present invention uses a PVD method, preferably a reactive ion plating method of depositing metal chromium in a reduced pressure nitrogen gas atmosphere, and has a nitrogen gas partial pressure of 0.2 to 0.7 × 10. -3 torr, the piston ring material is kept at a temperature of 250 ° C. or lower, and it can be formed as an amorphous material having a composition of chromium and nitrogen in the vapor deposition process of metallic chromium. In the present invention, the reason that the components constituting the coating layer are chromium and nitrogen is that the adhesion of chromium formed on the surface of the base metal by the reactive ion plating method to the base metal is good, and This is because its coefficient of thermal expansion is close to that of the base metal, and thus it is possible to prevent the coating layer from peeling off from the metal base during use of the piston ring. Another reason for particularly using chromium as a coating layer constituent in the present invention is that the deposition rate of metallic chromium by the ion plating method is higher than that of other metals, and it is extremely effective from the viewpoint of productivity. Because there is.
例えば、１×１０-5torrの真空中でクロムまたはチタン
を蒸発材料としてこれに２KWの電子ビームを照射し、該
蒸発材料から２４０ｍｍ離れて位置する炭素鋼(Ｓ４５
Ｃ)板の表面にクロムまたはチタンを蒸着させたとこ
ろ、チタンの蒸着速度は０．３４μ／ｍｉｎであるのに
対してクロムのそれは４．０μ／ｍｉｎであり、クロム
の蒸着速度は極めて速いものである。このクロムの大な
る蒸着速度は、本発明における如く反応性イオンプレー
ティング法によりクロムと窒素との非晶質被覆層を形成
させた場合にもみられる。For example, in a vacuum of 1 × 10 -5 torr, chromium or titanium is used as an evaporation material, and this is irradiated with an electron beam of 2 KW, and carbon steel (S45) located 240 mm away from the evaporation material is used.
C) When chromium or titanium is vapor-deposited on the surface of the plate, the vapor deposition rate of titanium is 0.34 μ / min, whereas that of chromium is 4.0 μ / min, and the vapor deposition rate of chromium is extremely high. Is. This high deposition rate of chromium is also observed when an amorphous coating layer of chromium and nitrogen is formed by the reactive ion plating method as in the present invention.
本発明のピストンリングは、その摺動面に、クロムと窒
素を組成とする非晶質でなる被覆層を形成させたもので
ある。したがって、該被覆層は耐蝕特性が良好である上
にピストンリング母材との密着は良好であり且つその耐
摩耗耐焼き付き特性は、硬質クロムめっき層を有する従
来のピストンリングに比べ格段に優れたもなる。The piston ring of the present invention has an amorphous coating layer composed of chromium and nitrogen formed on the sliding surface thereof. Therefore, the coating layer has good corrosion resistance, good adhesion to the piston ring base material, and its wear and seizure resistance is far superior to that of a conventional piston ring having a hard chromium plating layer. Also becomes.
１００×１００×１０ｍｍの鋳鉄製平板の片面をラッピ
ングして１μｍ以下の表面粗さに仕上げ、試料素材とし
た。これを反応性オンプレーティング装置の容器中にセ
ットし、該容器内を排気して５×１０-4torrの真空とし
て後、試料を加熱した。試料が所定温度に達してから容
器内にアルゴンガスを導入して１×１０-2torrとしボン
バードによる試料表面のクリーニングをおこない、次い
で容器内に窒素ガスを導入し所定の窒素ガス分圧にし、
金属クロムを蒸発材としてＨＣＤ型電子銃により蒸発さ
せ蒸着処理をおこなった。得られた試料表面被覆層につ
いて厚さおよび硬さを測定した。なお、被覆層の組織構
成はＸ線解析によっておこなった。操作条件および調査
結果を第１表および第５図に示す。第５図より明らかな
如く、試料ＮＯ．１は非晶質をなしており、試料ＮＯ．
２〜４はいづれも結晶質を示している。One side of a 100 × 100 × 10 mm cast iron flat plate was lapped to a surface roughness of 1 μm or less to obtain a sample material. This was set in a container of a reactive on-plating apparatus, the inside of the container was evacuated to a vacuum of 5 × 10 −4 torr, and then the sample was heated. After the sample reaches a predetermined temperature, argon gas is introduced into the container to 1 × 10 -2 torr to clean the sample surface by bombardment, and then nitrogen gas is introduced into the container to a predetermined nitrogen gas partial pressure,
A vapor deposition process was performed by evaporating metallic chromium using an HCD type electron gun as an evaporating material. The thickness and hardness of the obtained sample surface coating layer were measured. The texture of the coating layer was determined by X-ray analysis. The operating conditions and survey results are shown in Table 1 and FIG. As is clear from FIG. No. 1 is amorphous and sample No.
2 to 4 all show crystalline.
第１表より次のことが理解できる。 The following can be understood from Table 1.
１）窒素分圧が高く且つ試料温度が高いと蒸着皮膜層は
窒化クロムの組織となるが窒素分圧を低くし、試料温度
を低くすることにより非晶質でなる被覆層が得られる。1) When the nitrogen partial pressure is high and the sample temperature is high, the vapor-deposited coating layer has a structure of chromium nitride, but by lowering the nitrogen partial pressure and lowering the sample temperature, an amorphous coating layer can be obtained.
２）蒸着層の形成速度は窒素分圧が高くなるにつれて低
下する傾向を示している。2) The vapor deposition layer formation rate tends to decrease as the nitrogen partial pressure increases.
３）蒸着層の硬度は、クロムと窒素との非晶質となる場
合、ＨｍＶ １６７５と高く(試料NO.1)、従来の硬質ク
ロムめっき層の硬度（ＨｍＶ １０００程度）に比較し
て大幅に上昇されており、全体が窒化クロムである硬度
との差は比較的少ない。3) The hardness of the vapor-deposited layer is as high as HmV 1675 (Sample No. 1) when it becomes amorphous of chromium and nitrogen, which is significantly higher than that of the conventional hard chrome plating layer (about HmV 1000). It has been raised, and the difference from the hardness which is entirely chromium nitride is relatively small.
４）蒸着層の形成速度は数μｍ／ｍｉｎでありピストン
リングの表面処理として実用可能である。4) The deposition rate of the vapor-deposited layer is several μm / min, which is practical for surface treatment of piston rings.
前記の試料ＮＯ．１（本発明に係る表面被覆層を有する
試料）およびＮＯ．２〜４（窒化クロムの表面被覆層を
有する試料）から一方の正方形端部が被覆層となるよう
に５×５×１０ｍｍの試験片を採取し、耐焼付試験と耐
摩耗試験をおこなった。また、比較のために従来の硬質
クロムめっきを施した試料(Ｃｒめっき)及びイオンプレ
ーティング法により窒化チタンの被覆層を形成させた試
料(ＴｉＮ)についても同様な試験を実施した。The sample NO. 1 (sample having a surface coating layer according to the present invention) and NO. A test piece of 5 × 5 × 10 mm was sampled from 2 to 4 (sample having a surface coating layer of chromium nitride) so that one square end portion became a coating layer, and a seizure resistance test and an abrasion resistance test were performed. For comparison, a similar test was performed on a sample (Cr plating) which has been subjected to conventional hard chromium plating and a sample (TiN) which has a coating layer of titanium nitride formed by an ion plating method.
（耐焼き付き試験） 試験装置は第２図及び第３図にその概要を図解的に示す
ものであって、ステータ（４）に取外し可能に取り付け
られた直径８０ｍｍの円板（摺動相手材）（５）の中央
には裏側から注油孔（６）を通して潤滑油が注油され
る。また、ステータ(４)は図示省略した油圧装置によっ
て右方に向けて所定圧力で押され押圧力Ｐが作用するよ
うにしてある。円板（５）に相対向してロータ（７）が
配され、該ロータは図示省略した駆動装置によって所定
速度で回転する。(Seizure resistance test) The test apparatus is schematically shown in FIGS. 2 and 3, and is a disk (sliding mating member) with a diameter of 80 mm detachably attached to the stator (4). Lubricating oil is injected into the center of (5) from the back side through the oil injection hole (6). Further, the stator 4 is pushed rightward by a predetermined pressure by a hydraulic device (not shown) so that the pushing force P acts. A rotor (7) is arranged so as to face the disk (5), and the rotor is rotated at a predetermined speed by a drive device (not shown).
ロータ（７）の円板（５）に対向する端面には試料保持
具（７ａ）が設けられていて、該試料保持具（７ａ）に
は同心円上に等間隔をなして正方形の摺動面を有する４
個の試験片（８）が取り付けられ該摺動面が円板（５）
に対接摺動する。A sample holder (7a) is provided on the end surface of the rotor (7) facing the disc (5), and the sample holder (7a) has a square sliding surface on concentric circles at equal intervals. Having 4
A test piece (8) is attached and the sliding surface is a disc (5)
Sliding in contact with.
このような装置において、摺動面に所定給油速度で給油
しながらロータ（７）を回転させる。一定時間毎にステ
ータ（４）に作用する圧力を段階的に増加させ、円板
（５）と試料片との摺動により発生する摩擦力をトルク
Ｔとしてスピンドル（９）を介してロードセル（１０）
に作用させ、その変化を動歪計（１１）で読み、記録計
（１２）に記録させる。焼付き現象が発生するとトルク
Ｔが急激に上昇する。したがって、トルクＴが急激に上
昇するときに摺動接触面に作用している接触面圧を焼き
付き発生面圧とし、この焼き付き発生面圧の大小で耐焼
き付き特性の良否を判定する。In such a device, the rotor (7) is rotated while the sliding surface is being lubricated at a prescribed lubrication speed. The pressure acting on the stator (4) is increased stepwise at regular time intervals, and the frictional force generated by the sliding of the disk (5) and the sample piece is taken as the torque T, and the load cell (10) is passed through the spindle (9). )
The change is read by the dynamic strain gauge (11) and recorded by the recorder (12). When the seizure phenomenon occurs, the torque T rapidly increases. Therefore, the contact surface pressure acting on the sliding contact surface when the torque T rapidly rises is defined as the seizure-occurring surface pressure, and whether the seizure resistance is good or bad is determined based on the magnitude of the seizure-occurring surface pressure.
試験条件は次の通り。The test conditions are as follows.
摺動速度：８ｍ／秒 潤滑油 ：ＳＡＥ＃２０モータオイル 潤滑油の供給条件：３００ｍｌ／分 油温９０℃ 接触圧力：２０ｋｇ／ｃｍ2から３分間経過毎に１０ｋ
ｇ／ｃｍ2づつ上昇させる。Sliding speed: 8 m / sec Lubricating oil: SAE # 20 motor oil Lubricating oil supply condition: 300 ml / min Oil temperature 90 ° C Contact pressure: 20 kg / cm 2 10 k every 3 minutes
Increase by g / cm 2 .
摺動相手材〔円板(5)〕：鋳鉄材ＦＣ３０試験結果を第
２表に示す。Sliding mating material [disc (5)]: cast iron material FC30 test results are shown in Table 2.
第２表より明らかな如く、本発明に係る表面被覆層（試
料ＮＯ．１）は窒化チタン等の被覆層（試料ＮＯ．２〜
４）を凌駕する耐焼き付き特性を示し、硬質クロムめっ
き材に比較して格段に優れた耐焼き付き特性を示してい
る。 As is clear from Table 2, the surface coating layer (Sample No. 1) according to the present invention is a coating layer of titanium nitride or the like (Sample No. 2 to Sample No. 2).
It shows seizure resistance superior to that of 4), and is significantly superior to the hard chrome plated material.
（耐摩耗試験） 前記の耐焼き付き試験で用いた試験装置を使用し、接触
圧力を１００ｋｇ／ｃｍ2とし、摩擦速度を３ｍ／ｍｉ
ｎ，５ｍ／ｍｉｎ，８ｍ／ｍｉｎの３段階にして各摩擦
速度で、摩擦距離を４００ｋｍ、給油量を５００ｍｌ／
ｍｉｎとして試験片と相手円板とを摺動させた後、試験
片および相手円板を試験装置から取り外し、両者の摩耗
量を測定した。なお、試験片および相手円板の材料は前
記の耐焼き付き試験に於けると同一とした。(Abrasion resistance test) Using the test apparatus used in the seizure resistance test, the contact pressure was 100 kg / cm 2 , and the friction speed was 3 m / mi.
n, 5 m / min, 8 m / min in 3 stages, at each friction speed, friction distance 400 km, oil supply amount 500 ml /
After sliding the test piece and the mating disk at min, the test piece and the mating disk were removed from the test device, and the amount of wear of both was measured. The materials of the test piece and the mating disc were the same as those used in the seizure resistance test.
試験片の摩耗量は試験片の摩耗高さで、また、相手円板
の摩耗量は摩耗によって生じた環状摩耗痕の半径方向断
面積で測定した。The wear amount of the test piece was measured by the wear height of the test piece, and the wear amount of the mating disk was measured by the radial cross-sectional area of the annular wear mark generated by the wear.
試験結果を第４図に示す。The test results are shown in FIG.
窒化クロムや窒化チタンでなる被覆層を有する試験片
（試料ＮＯ．２，４およびＴｉＮ）は、耐摩耗特性が優
れているとして従来実用に供されている硬質クロムめっ
きに較べ良好な耐摩耗特性を示しており、クロムと窒素
との非晶質組織でなる被覆層を有する試験片（試料Ｎ
Ｏ．１）は自身の摩耗量および相手円板の摩耗量共に試
料ＮＯ．２，４やＴｉＮよりも少なく、一層優れた耐摩
耗特性を示している。なお、前記の試料ＮＯ．３は前記
耐焼き付き特性試験において満足な特性を示さなかった
ので、本耐摩耗試験の対象から除いた。The test pieces having a coating layer made of chromium nitride or titanium nitride (Samples No. 2, 4 and TiN) have excellent wear resistance characteristics as compared with the hard chromium plating which has been conventionally put to practical use because of its excellent wear resistance characteristics. And a test piece having a coating layer composed of an amorphous structure of chromium and nitrogen (Sample N
O. In sample No. 1), both the amount of wear of itself and the amount of wear of the mating disk are both. It has less wear resistance than 2, 4 and TiN, and shows more excellent wear resistance. The sample No. No. 3 did not show satisfactory characteristics in the seizure resistance test, and thus was excluded from the subject of the wear resistance test.
次に、第１図に示すように、ばね鋼(SUP-8)製ピストン
リング(２)を製作し、その外周摺動面に前記方法により
クロムと窒素を成分組成とする非晶質組織でなる表面被
覆層(３)を形成した。Next, as shown in FIG. 1, a piston ring (2) made of spring steel (SUP-8) was manufactured, and the outer peripheral sliding surface thereof was made to have an amorphous structure composed of chromium and nitrogen by the above method. The following surface coating layer (3) was formed.
被覆層(３)の形成条件およびその特性は次の通りであ
る。The conditions for forming the coating layer (3) and its characteristics are as follows.
形成条件:Arガス分圧...１×１０-3torr 窒素ガス分圧...０．３×１０-3torr 電子ビーム出力...２５Ｖ−３００Ａ 素材温度...２００℃ 処理時間...６０分 被覆層特性:被覆層厚さ...３５μｍ 硬 さ ...HmV１６７５ 組 織 ...Ｘ線解析により非晶質であることを確認
した。Forming conditions: Ar gas partial pressure ... 1 × 10 -3 torr Nitrogen gas partial pressure ... 0.3 × 10 -3 torr Electron beam output ... 25V-300A Material temperature ... 200 ° C Processing time. .. 60 minutes Coating layer characteristics: coating layer thickness ... 35 μm hardness ... HmV1675 tissue ... X-ray analysis confirmed amorphous.
上記のピストンリングを排気量１５００ＣＣ、水冷４気
筒の４サイクルガソリンエンジンの第１圧力リングに組
み込み、加鉛ガソリンを燃料として回転数５５００ｒｐ
ｍ、油温１１０℃、冷却水温度９０℃、全負荷の条件で
２００時間のベンチテストを行った後、ピストンリング
外周面の摩耗料を測定した。なお、比較のために外周面
に硬質クロムめっきを施したピストンリングを用いて同
様の試験を実施した。The piston ring described above was incorporated into the first pressure ring of a water-cooled 4-cylinder 4-cycle gasoline engine with a displacement of 1500 CC, and the rotational speed was 5500 rp using lead gasoline as fuel.
m, oil temperature 110 ° C., cooling water temperature 90 ° C., a bench test was carried out for 200 hours under the conditions of full load, and the wear material on the outer peripheral surface of the piston ring was measured. For comparison, the same test was carried out using a piston ring having an outer peripheral surface plated with hard chromium.
試験の結果、硬質クロムめっきを施した従来のピストン
リングの外周面の摩耗量は７９μｍであったのに対し、
本発明のピストンリングのそれは１５μｍであった。ま
た、本発明のピストンリングには被覆層の剥離等も発生
していなかった。As a result of the test, while the wear amount of the outer peripheral surface of the conventional piston ring plated with hard chromium was 79 μm,
That of the piston ring of the present invention was 15 μm. Further, the coating of the piston ring of the present invention did not peel off.
以上の通りで、本発明のピストンリングは、その摺動面
にクロムと窒素とを組成とする非晶質合金層を有する。
したがって、摺動面の耐蝕性が良好であるとともに、耐
焼き付き特性が良好で且つ耐摩耗特性に優れており、過
酷な運転条件下で使用される内燃機関に使用する場合に
特にその効果が顕著である。As described above, the piston ring of the present invention has the amorphous alloy layer composed of chromium and nitrogen on the sliding surface thereof.
Therefore, the sliding surface has good corrosion resistance, good seizure resistance, and excellent wear resistance, and its effect is particularly remarkable when used for an internal combustion engine used under severe operating conditions. Is.
第１図は本発明のピストンリングの一例を示す断面図、
第２〜３図は耐焼き付きおよび耐摩耗試験装置を示す一
部断面図および側面図、第４図は耐摩耗試験結果を示す
グラフ図。第５図は各試料についてのＸ線解析チャート
を示す図。 図中： １……ピストンリング母材 ２……ピストンリング ３……被覆層 ４……ステータ ５……円板(摺動相手材) ７……ロータ ８……試料FIG. 1 is a sectional view showing an example of a piston ring of the present invention,
2 to 3 are partial cross-sectional views and side views showing a seizure resistance and wear resistance test apparatus, and FIG. 4 is a graph showing the results of the wear resistance test. FIG. 5 is a diagram showing an X-ray analysis chart for each sample. In the figure: 1 …… Piston ring base material 2 …… Piston ring 3 …… Coating layer 4 …… Stator 5 …… Disk (sliding mating material) 7 …… Rotor 8 …… Sample
Claims (1)
を組成とする非晶質でなる被覆層を形成させたことを特
徴とするピストンリング。1. A piston ring, wherein an amorphous coating layer having a composition of chromium and nitrogen is formed on at least one sliding surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59218588A JPH0610455B2 (en) | 1984-10-19 | 1984-10-19 | piston ring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59218588A JPH0610455B2 (en) | 1984-10-19 | 1984-10-19 | piston ring |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6198949A JPS6198949A (en) | 1986-05-17 |
| JPH0610455B2 true JPH0610455B2 (en) | 1994-02-09 |
Family
ID=16722304
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59218588A Expired - Lifetime JPH0610455B2 (en) | 1984-10-19 | 1984-10-19 | piston ring |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0610455B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62298647A (en) * | 1986-06-18 | 1987-12-25 | Nippon Piston Ring Co Ltd | Sliding member for internal combustion engine |
| JPH01159449A (en) * | 1987-12-15 | 1989-06-22 | Riken Corp | Piston ring with compound nitriding layer |
| JPH0754591Y2 (en) * | 1989-02-23 | 1995-12-18 | 株式会社リケン | Internal combustion engine |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59127858U (en) * | 1983-02-18 | 1984-08-28 | 日本ピストンリング株式会社 | piston ring |
-
1984
- 1984-10-19 JP JP59218588A patent/JPH0610455B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6198949A (en) | 1986-05-17 |
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