JPS6045717B2 - Piston rings for internal combustion engines - Google Patents

Description

【発明の詳細な説明】 この発明は耐摩耗性の表面処理をされた高速で摺動する
ピストンリングに係る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high speed sliding piston ring with a wear-resistant surface treatment.

シリンダまたはシリンダライナと高速で摺動するピスト
ンリングは耐摩耗性を高めるため外周摺動面に硬質クロ
ムめつきを施したものが広く使用されているが、このめ
つき処理にかなりの長時間を要する上に、めつきの廃液
による公害発生の防止対策に多くの費用を要し、めつき
のコストが高くなる等の問題点がある。Piston rings that slide on the cylinder or cylinder liner at high speed are widely used with hard chrome plating applied to the outer sliding surface to increase wear resistance, but this plating process takes a considerable amount of time. In addition, there are problems in that a large amount of money is required to prevent pollution caused by waste liquid from plating, which increases the cost of plating.

硬質クロムめつき以外の表面処理としては元素周期律表
中の肱属に属する鉄、コバルトまたはニッケル中に炭化
珪素のような硬質粒子を分散させた分散めつきや、初期
なじみ性が良好なモリブデン溶射が既に採用されている
が、高鉛ガソリンを燃料とするガソリンエンジンに使用
した場合にはピストンリングの摩耗が多く、エンジンの
次期オーバホールまでの期間、いわゆる解放期間が短く
なるという欠点がある。Surface treatments other than hard chrome plating include dispersion plating, in which hard particles such as silicon carbide are dispersed in iron, cobalt, or nickel, which belong to the genus Elements in the periodic table, and molybdenum, which has good initial conformability. Thermal spraying has already been adopted, but when used in gasoline engines that use high-lead gasoline as fuel, the disadvantage is that piston rings are subject to a lot of wear, and the period until the engine's next overhaul, the so-called release period, is shortened. .

本発明は従来の表面処理を施されたピストンリングより
も一層耐摩耗性に優れると共に、相手材を摩耗させるこ
とが少なく、かつ焼着を生じ難いピストンリングを提供
することを目的とし、内燃機関用ピストンリングにおい
て、燐を２〜１踵量％含有するニッケルめつき層であつ
て、平均粒径０．５〜５μｍの窒化珪素粒子が容積比で
５〜３０％分散され、かつ熱処理を施されてマイクロビ
ッカース硬さ８００以上に硬化された複合ニッケルめつ
き層を摺動面に有することを特徴とする内燃機関用ピス
トンリングに係る。The purpose of the present invention is to provide a piston ring that has better wear resistance than piston rings that have been subjected to conventional surface treatment, that is less likely to wear out mating materials, and that is less likely to cause seizing. A piston ring for use in a nickel-plated layer containing 2 to 1% phosphorus, in which silicon nitride particles with an average particle size of 0.5 to 5 μm are dispersed in a volume ratio of 5 to 30%, and is heat-treated. The present invention relates to a piston ring for an internal combustion engine, characterized in that it has a composite nickel plating layer on its sliding surface that has been hardened to a micro-Vickers hardness of 800 or more.

めつきを施す母材としては通例のピストンリングの材料
として使用される鉄鋼材料、すなわち鋳鉄、鋼、鉄基焼
結合金あるいは鉄基耐熱合金等を使用する。The base material to be plated is a steel material commonly used as a material for piston rings, such as cast iron, steel, iron-based sintered alloy, or iron-based heat-resistant alloy.

これら材料で作られた部品の表面に本発明に係る窒化珪
素分散含燐ニッケルめつきを施すのには窒化珪素粒子を
懸濁させたニッケル・次亜燐酸塩浴中で化学めつきを施
すいわゆる無電解・法または窒化珪素粒子を懸濁させた
通常のニッケルめつき液に次亜燐酸塩を添加した液をめ
つき液とし、めつきしようとする部品を陰極とし、ニッ
ケル板またはボールを陽極として電気めつきを施す方法
のいずれでもよい。含燐ニッケルめつき層・は熱処理を
施すことによつて硬さが増加することが知られており、
例えは４００℃、１時間の熱処理によつてビッカース硬
さＨＶ５ＯＯ±５咽度の硬さがほぼＨｖｌＯＯ哩度まで
硬化する。本発明においてはこのように熱処理を施し、
めつき層を硬化させて使用する。窒化珪素分散めつきを
施すに当り、無電解ニッケルめつきの楊合はめつき層の
密着性が良好なのでニッケルストライクめつきは不要で
ある。In order to apply the silicon nitride dispersed phosphorus-containing nickel plating according to the present invention to the surfaces of parts made of these materials, so-called chemical plating is performed in a nickel/hypophosphite bath in which silicon nitride particles are suspended. The plating solution is an electroless plating solution or a solution made by adding hypophosphite to a normal nickel plating solution with silicon nitride particles suspended.The part to be plated is used as the cathode, and the nickel plate or ball is used as the anode. Any method of electroplating may be used. It is known that the hardness of the phosphorous-containing nickel plating layer increases by heat treatment.
For example, by heat treatment at 400° C. for 1 hour, the Vickers hardness of HV5OO±5 degrees is hardened to approximately HvlOO. In the present invention, heat treatment is performed in this way,
Use after hardening the plating layer. When performing silicon nitride dispersion plating, nickel strike plating is not necessary because the adhesion of the electroless nickel plating layer is good.

しかしながら電気めつきの場合には予めニッケルストラ
イクめつきを施しておくことは母材との密着性を良好に
するために好ましい。本発明に使用する窒化珪素粒子の
平均粒径は０．５〜５μｍの大きさで最大粒子径が１０
ｐｍ以下のものが好適であり、これが０．５μｍ以下で
は耐摩耗性改善の効果が不充分であり、５μｍよりも粗
くなるとめつき層が脆くなり、摺動中に欠けおちるのが
多くなる。However, in the case of electroplating, it is preferable to apply nickel strike plating in advance to improve adhesion to the base material. The average particle size of the silicon nitride particles used in the present invention is 0.5 to 5 μm, and the maximum particle size is 10 μm.
pm or less is preferable; if it is less than 0.5 μm, the effect of improving wear resistance will be insufficient; if it is rougher than 5 μm, the plated layer will become brittle and will often chip during sliding.

めつき層中の窒化珪素粒子の量は容積比で５〜３０％が
適当であり、これが５％より少ないと耐摩耗性改善の効
果が不充分であり、３０％を越えると摺動相手材を摩耗
させることが多くなる上に、含冫燐ニッケルめつき層の
強度も低下する。The appropriate amount of silicon nitride particles in the plating layer is 5 to 30% by volume; if it is less than 5%, the effect of improving wear resistance will be insufficient, and if it exceeds 30%, it will damage the sliding mating material. In addition, the strength of the phosphorus-containing nickel plating layer decreases.

第１図は本発明に係る摺動部品表面近くの断面の顕微鏡
組織を示す写真（２０ＣＰｉ）てあり、図中最下部の層
１は母材、中間の薄黒色のほぼ無地の層２は下地のニッ
ケルストライク層、その上の表２面層３が窒化珪素粒子
分散含燐ニッケルめつき層であり、熱処理により硬化し
た含燐ニッケルめつき層中に窒化珪素粒子が分散した組
織となつているのて耐摩耗性が著しく改善される。Fig. 1 is a photograph (20CPi) showing the microscopic structure of a cross section near the surface of a sliding part according to the present invention. In the figure, the lowest layer 1 is the base material, and the middle thin black almost plain layer 2 is the base material. The nickel strike layer, and the surface layer 3 on top of the nickel strike layer 3 is a phosphorous-containing nickel plating layer with silicon nitride particles dispersed therein, and has a structure in which silicon nitride particles are dispersed in the phosphorus-containing nickel plating layer hardened by heat treatment. As a result, wear resistance is significantly improved.

上記の表層の窒化珪素分散含燐ニッケルめつき層の厚さ
と、３もしニッケルストライクめつきを施す場合にはそ
の厚さとはいずれは機械的強度の観点から５μｍ以上で
あることが望ましい。次に本発明に係る摺動面の摩耗試
験および焼着試験について説明する。The thickness of the silicon nitride dispersed phosphorus-containing nickel plating layer on the surface layer and, if nickel strike plating is applied, are preferably 5 μm or more from the viewpoint of mechanical strength. Next, a wear test and a seizure test of sliding surfaces according to the present invention will be explained.

試験は第２図および第３３図に要部を図解的に示すライ
ター方式摩耗試験機によつて行なつた。その概要を述べ
ればステータホルダ１にＦＣ２遍で摺動面２がホーニン
グ仕上げされた円板３が取外し可能に取付けられており
、その中央には裏側から注油孔４を通して潤滑４油が注
油されるようにしてあり、図示しない油圧装置によつて
ステータホルダ１には図において右方へ向けて所定圧力
て押圧力がかかるようにしてある。円板３に対向してロ
ータ５上に取付けられた試験片保持具６の回転軸と同心
の円周上に等間隔に刻設された４個の取付孔にそれぞれ
試験片７が取付けられ、それぞれ所定の表面処理が施さ
れた試験片の５×５ｗ０ｎ角の先端端面が円板３の摺動
面２に接触し、図示しない駆動装置によつて所定速度で
回転する。試験はステータ側の注油孔４から一定油温の
潤滑油を摺動面に供給しながら行なう。 摩耗試験は一
定の押圧力の下でロータ５を回転させ、試験片７が所定
の摺動距離だけ円板３上を摺動したときの試験片７とス
テータ円板３の摩耗量によつて耐摩耗性を評価する。
またロータ５を回転させると試験片７と円板３との摩擦
によつてステータホルダ１には図示のようにトルクＦを
生ずるのでスピンドル８を介してロードセル９に作用さ
せ、押圧力の変化によるトルクＦの変化を動歪計１０で
読み、トルクＦが急激に上昇したときに焼着が生じたと
して、そのときの押圧力（面圧）をもつて耐焼着性を評
価する焼着試験を行なうこともできる。The test was conducted using a lighter type abrasion tester whose main parts are schematically shown in FIGS. 2 and 33. To give an overview, a disc 3 with a honed sliding surface 2 is removably attached to a stator holder 1, and lubricant 4 oil is applied to the center of the disc 3 through an oil hole 4 from the back side. A predetermined pressing force is applied to the stator holder 1 toward the right in the figure by a hydraulic device (not shown). A test piece 7 is attached to each of four attachment holes carved at equal intervals on a circumference concentric with the rotation axis of a test piece holder 6 attached to the rotor 5 facing the disk 3, The 5×5w0n square tip end face of each test piece, which has been subjected to a predetermined surface treatment, contacts the sliding surface 2 of the disk 3 and is rotated at a predetermined speed by a drive device (not shown). The test is conducted while lubricating oil at a constant temperature is supplied to the sliding surface from the oiling hole 4 on the stator side. In the wear test, the rotor 5 is rotated under a constant pressing force, and the amount of wear between the test piece 7 and the stator disk 3 is measured when the test piece 7 slides on the disk 3 by a predetermined sliding distance. Evaluate wear resistance.
Furthermore, when the rotor 5 is rotated, the friction between the test piece 7 and the disk 3 generates a torque F in the stator holder 1 as shown in the figure. The change in torque F was read with the dynamic strain meter 10, and if seizure occurred when the torque F suddenly increased, a seizure test was carried out to evaluate the seizure resistance using the pressing force (surface pressure) at that time. You can also do it.

（イ）摩耗試験：潤滑油として加鉛ガソリンを燃料 と
する実機テストに使用後のエンジンオイルＳＡＥＮＯ．
３Ｏにダスト（ＪＩＳ４重）を０．２ｇ／ｅ添加し た
温度８０℃の油を用いて、注油孔４から供給 し、ステ
ータホルダ１にはロータ側に向けて油 圧１００ｋｇ／
ｄの押圧力を加えながら、試験片７ の摩擦速度を３ま
たは５ｍ／Ｓｅｃとし、摺動距離 が１００ｈとなるま
でロータ５を回転させた。(a) Wear test: Engine oil SAENO. after being used in an actual machine test using leaded gasoline as a lubricant.
Oil at a temperature of 80°C, which is 3O with 0.2g/e of dust (JIS 4-heavy) added, is supplied from the oil fill hole 4, and the stator holder 1 is supplied with oil pressure of 100kg/e toward the rotor.
While applying a pressing force of d, the friction speed of the test piece 7 was set to 3 or 5 m/Sec, and the rotor 5 was rotated until the sliding distance reached 100 h.

試験片７の端面の表面処理としては本発明に 係る
分散含燐ニッケルめつき層厚さ１２０μｍを 形成し、
平均粒径１μｍの窒化珪素粒子を容積 比で２５％均一
に分散させ、４００゜Ｃ×１時間の硬 化熱処理を施し
てＨＭｖ８ＯＯ〜１０００としたもの で、電気めつき
法、無電解法とも同程度の硬さ であつた。成積は第４
図において符号Ｆ（電気 めつき法）、符号Ｇ（無電解
法）で示してあ る。 対比材として窒化珪素が分散
されていない含 燐ニッケルめつきの無電解カニゼン（
符号ＲＡ）、一般に耐摩耗性表面処理に用いられる硬
質クロムめつき（符号Ｂ）、耐摩耗性、耐スカ ツフ性
が注目されているモリブ下ン溶射（符号Ｃ）、平均粒径
１μｍの炭化珪素粒子が均一に 分散されたニッケルめ
つき（符号Ｄ）および同じく炭化珪素分散含燐ニッケル
無電解めつき（符号Ｅ）を施した試験片についても同様
に試験を行なつた。As a surface treatment for the end face of the test piece 7, a dispersed phosphorous-containing nickel plating layer according to the present invention was formed with a thickness of 120 μm.
Silicon nitride particles with an average particle size of 1 μm are uniformly dispersed at 25% by volume, and hardening heat treated at 400°C for 1 hour to give HMv8OO~1000, and is the same for both electroplating and electroless methods. It was moderately hard. The result is the fourth
In the figure, they are indicated by symbol F (electroplating method) and symbol G (electroless method). As a contrast material, electroless Kanizen (phosphorus-containing nickel plated) without silicon nitride dispersed was used.
RA), a hard material commonly used for wear-resistant surface treatment.
High-quality chrome plating (code B), thermal spraying under molybdenum (code C), which is attracting attention for its wear resistance and scuff resistance, and nickel plating with uniformly dispersed silicon carbide particles with an average particle size of 1 μm (code D) and a test piece to which electroless nickel plating containing phosphorus containing silicon carbide was similarly applied (symbol E) was similarly tested.

試験結果は第４図（図中３，５はそれぞれ摩擦速度を示
す）に示してあるとおりで、ロータの摩耗量は摩擦距離
１００ｋｍ当りの試験片４本のめつき面の摩耗厚さの合
計で、またステータの摩耗量は摩耗痕の断面積で示して
ある。The test results are shown in Figure 4 (numbers 3 and 5 indicate the friction speed), and the amount of rotor wear is the sum of the wear thickness of the plated surfaces of the four test pieces per 100 km of friction distance. Also, the amount of wear on the stator is shown by the cross-sectional area of the wear marks.

本発明に係る窒化珪素分散含燐ニッケルめつき層（符号
Ｆ，Ｇ）を有する試験片およびステーータは摩耗量が最
も少なく、また炭化珪素を分散させた含燐ニッケルめつ
きの試験片Ｅに比しても明らかに優れた耐摩耗性を有す
ることが判る。The test pieces and stators having silicon nitride-dispersed phosphorous-containing nickel plating layers (symbols F and G) according to the present invention had the least amount of wear, and compared to test piece E with phosphorous-containing nickel plating in which silicon carbide was dispersed. It can be seen that it has clearly excellent wear resistance.

（ロ）焼着試験：潤滑油は摩耗試験と同じものを使用し
、ステータホルダ１にはロータ側に向けてます油圧４０
ｋ９／ｄの押圧力を加え、摩擦速度８ｍ／Ｓｅｃでロー
タ５を３分間回転させ、次に押圧力を５０ｋ９／Ｃｌｔ
として３分間回転させ、このようにして順次押圧力を１
０ｋ９／Ｃｌｔづつ段階的に増５加して各々３分間保持
し、ロードセル９を介して動歪計１０でトルクＦの変化
を記録し、急激にトルクの増加したときの押圧力から接
触面圧を求めて焼付発生面圧とした。(b) Seizure test: Use the same lubricating oil as in the wear test, with stator holder 1 facing the rotor side. Hydraulic pressure 40
Apply a pressing force of k9/d, rotate the rotor 5 for 3 minutes at a friction speed of 8 m/Sec, then apply a pressing force of 50 k9/Clt.
Rotate for 3 minutes and increase the pressing force to 1 in this way.
The torque F was increased stepwise by 0k9/Clt and held for 3 minutes each time, and the change in torque F was recorded by the dynamic strain meter 10 via the load cell 9, and the contact surface pressure was determined from the pressing force when the torque suddenly increased. was determined and used as the surface pressure at which seizure occurred.

本発明に係る試験片としては（イ）摩耗試験におけると
同じ処理を施したものを用い、また対比のため同様（イ
）摩耗試験の対比材と同じ処理を施した試験片について
試験を行なつた。なお試験は２回行ない、その結果は第
１表に示すとおりである。本発明に係る窒化珪素分散含
燐ニッケルめつきを施した試験片は初期なじみ性質が良
好であることが周知のモリブデン溶射品と同等かそれ以
上の成積を示し、窒化珪素の代りに炭化珪素を分散させ
た含燐ニッケルめつき層を有する試験片Ｅよりも顕著に
優れた耐焼着性を示している。As the test piece according to the present invention, a test piece that was subjected to the same treatment as in (a) the abrasion test was used, and for comparison, the test was also conducted on a test piece that was subjected to the same treatment as the control material in (a) the abrasion test. Ta. The test was conducted twice and the results are shown in Table 1. The test piece coated with silicon nitride-dispersed phosphorous-containing nickel plating according to the present invention showed good initial conformability properties, and showed a build-up comparable to or better than that of the well-known molybdenum sprayed product, and silicon carbide was used instead of silicon nitride. The anti-seizure property was significantly superior to that of test piece E, which had a phosphorous-containing nickel plating layer with dispersed phosphorus-containing nickel.

（ハ）ベンチテストニ次にピストンリングについて実施
例およびペンチテスト成積を述べる。(c) Bench test Next, examples and pliers test results for piston rings will be described.

７７×１．２×３．２Ｔｒ＄Ｌ鋼製第一圧力リングおよ
び７７×０．６１×２．３Ｔ！ｒｌ！Ｌ鋼製組合せ油掻
きリングのレール外周面にまず通例のニッケルストライ
クめつき方法で厚さ１０ｐｍのニッケルめつき層を形成
させておき、次にスルファミン酸ニッケル４５０ｇ／ｌ
、塩化ニッケル３０ｇ／′、硼酸３０ｇ／ｅ１次亜燐酸
ナトリウム２ｇ／′から成るベースめつき液に平均粒径
１μｍ（最大粒径５μｍ）窒化珪素粒子を６０ｇ／ｆ添
加し撹拌しながら液温５０〜５３℃、ＰＨ４．５の浴中
で、電流密度８Ａｄイとしてニッケルストライク層の上
に厚さ１２０ｐｍの窒化珪素分散含燐ニッケルめつき層
を電気めつき法で形成させた。77×1.2×3.2Tr$L steel first pressure ring and 77×0.61×2.3T! rl! First, a nickel plating layer with a thickness of 10 pm was formed on the outer peripheral surface of the rail of the L steel combination oil scraper ring using the usual nickel strike plating method, and then 450 g/l of nickel sulfamate was applied.
, 60 g/f of silicon nitride particles with an average particle size of 1 μm (maximum particle size of 5 μm) were added to a base plating solution consisting of 30 g/' of nickel chloride, 30 g/e of boric acid, 2 g/' of sodium hypophosphite, and the solution temperature was raised to 50°C while stirring. A silicon nitride dispersed phosphorus-containing nickel plating layer having a thickness of 120 pm was formed on the nickel strike layer by electroplating in a bath at ~53°C and pH 4.5 at a current density of 8A.

該めつき層中の窒化珪素粒子の量は容積比で２５％であ
つた。次に４００℃、１時間加熱して硬化熱処理を施し
、表面硬さＨＭｖ８ＯＯ〜９５０とした。上記電気めつ
き法とは別に、硫酸ニッケル２５ｇ／ｅ１次亜燐酸ナト
リウム３０ｇ／ｅ１コハク酸１６ｇ／ｅ１リンゴ酸２４
ｇ／Ｅ．．ＰＨ４．２、液温９０℃、平均粒径１μｍ（
最大粒径５μｍ）の窒化珪素粒子を１．５ｇ／′添加し
ためつき浴を撹拌しながら、その中で前記寸法と同じ寸
法のリングを無電解めつきして厚さ１００ｐｍ（７）窒
化珪素分散含燐ニッケルめつき層を形成させた。これら
のピストンリングをシリンダボア径７７順、４サイクル
、直列４気筒水冷エンジンに組付けて、高鉛ガソリンを
燃料とし５５００ｒ．ｐ．ｍ．、全負荷、１０ＣＷＩ間
の下記のペンチテスト（１），（２）を行ない、ピスト
ンリングの外周摺動面および鋳鉄（ＦＣ２５）製シリン
ダライナ内周面の摩耗量を測定した。The amount of silicon nitride particles in the plating layer was 25% by volume. Next, a hardening heat treatment was performed by heating at 400° C. for 1 hour to obtain a surface hardness of HMv8OO to 950. Apart from the above electroplating method, nickel sulfate 25g/e1 sodium hypophosphite 30g/e1 succinic acid 16g/e1 malic acid 24
g/E. ．． PH4.2, liquid temperature 90℃, average particle size 1μm (
While stirring a matting bath to which 1.5 g/' of silicon nitride particles with a maximum particle size of 5 μm were added, a ring having the same dimensions as above was electrolessly plated to a thickness of 100 pm. (7) Silicon nitride A dispersed phosphorous-containing nickel plating layer was formed. These piston rings were assembled into a 4-cycle, in-line 4-cylinder water-cooled engine with a cylinder bore diameter of 77, and a 5,500 r.p.m. p. m. The following pliers tests (1) and (2) were carried out at full load and 10 CWI to measure the amount of wear on the outer circumferential sliding surface of the piston ring and the inner circumferential surface of the cast iron (FC25) cylinder liner.

比較のため硬質クロムめつき、モリブデン溶射、炭化珪
素分散ニッケルめつき（厚さ１５０μｍ１粒子径および
分散量は本発明の上記例と同程度とした）を施したピス
トンリングについても同様に試験を行なつた。（１）
第１圧力リングに上記表面処理を施した圧力リングを、
第２圧力リングには７７×１．５×３．３顛の鋳鉄製リ
ングを、油掻きリングには７７×０．６１×２．３醋の
クロムめつきレールを有する組合せリングを使用した。For comparison, piston rings with hard chrome plating, molybdenum spraying, and silicon carbide dispersed nickel plating (thickness: 150 μm, particle size and dispersion amount were similar to those of the above example of the present invention) were similarly tested. Summer. (1)
A pressure ring in which the first pressure ring has been subjected to the above surface treatment,
A cast iron ring measuring 77 x 1.5 x 3.3 mm was used as the second pressure ring, and a combination ring with a chrome plated rail measuring 77 x 0.61 x 2.3 mm was used as the oil scraper ring.

試験結果は第２表に示すとおりである。（２）油掻きリ
ングに上記の表面処理を施したリングを使用し、第１圧
力リングはクロムめつきリングを、第２圧力リングは鋳
鉄製リング（寸法はいずれも上記（１）の場合に同じ）
を使用して試験を行なつた結果は第３表に示すとおりで
ある。The test results are shown in Table 2. (2) Use a ring with the above surface treatment for the oil scraper ring, the first pressure ring is a chrome-plated ring, and the second pressure ring is a cast iron ring (all dimensions are as in (1) above). same)
Table 3 shows the results of the tests conducted using .

上記第２表、第３表から明らかなように比較品のうち摺
動面に炭化珪素分散ニッケルめつき層を有するピストン
リングは特に耐摩耗性が優れているが、本発明に係る窒
化珪素分散含燐ニッケルめつき層を有するピストンリン
グはこれよりも摩耗量が少なく、更に優れた耐摩耗性を
有していることが判る。As is clear from Tables 2 and 3 above, among the comparative products, the piston ring having a silicon carbide-dispersed nickel plating layer on the sliding surface has particularly excellent wear resistance, but the silicon nitride-dispersed nickel plated layer according to the present invention It can be seen that the piston ring having a phosphorous-containing nickel plating layer has less wear than this and has even better wear resistance.

以上説明したように摺動面に窒化珪素分散含燐ニッケル
めつきを施した本発明に係る摺動部品は・炭化珪素分散
含燐ニッケルめつきまたはその他の耐摩耗性表面処理を
施した摺動部品に比して高鉛ガソリンを燃料とするエン
ジンのピストンリング用として優れた耐摩耗性を示し、
エンジンの解放期間を顕著に延長することができる。As explained above, the sliding parts according to the present invention whose sliding surfaces are plated with silicon nitride-dispersed phosphorous-containing nickel are: - Sliding parts whose sliding surfaces are plated with silicon carbide-dispersed phosphorous-containing nickel or other wear-resistant surface treatments. It exhibits superior wear resistance for piston rings in engines that use high-lead gasoline as fuel compared to other parts.
The engine release period can be significantly extended.

またその他の高速で摺動する摺動部品に適用して自己の
寿命ならず、相手摺動部品の寿命を長くせることができ
、広い適用範囲において工業上の効果は著しい。In addition, it can be applied to other sliding parts that slide at high speeds to extend the life of not only the sliding parts themselves but also the other sliding parts, and the industrial effect is remarkable in a wide range of applications.

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

第１図は本発明に係る摺動部品断面の顕微鏡組織を示す
写真、第２図は摩耗試験機の一部破砕側面図、第３図は
同じく第２図■−■矢視正面図、第４図は摩耗試験結果
を示すグラフである。Fig. 1 is a photograph showing a microscopic structure of a cross section of a sliding part according to the present invention, Fig. 2 is a partially fragmented side view of the wear tester, Fig. 3 is a front view as seen from Fig. 2 Figure 4 is a graph showing the results of the wear test.

Claims (1)

【特許請求の範囲】[Claims] １ 内燃機関用ピストンリングにおいて、燐を２〜１０
重量％含有するニッケルめつき層であつて、平均粒径０
．５〜５μｍの窒化珪素粒子が容積比で５〜３０％分散
され、かつ熱処理を施されてマイクロビッカース硬さ８
００以上に硬化された複合ニッケルめつき層を摺動面に
有することを特徴とする内燃機関用ピストンリング。1. In piston rings for internal combustion engines, phosphorus is added in amounts of 2 to 10
A nickel plating layer containing % by weight, with an average particle size of 0
．． Silicon nitride particles with a diameter of 5 to 5 μm are dispersed in a volume ratio of 5 to 30%, and heat treated to achieve a micro Vickers hardness of 8.
A piston ring for an internal combustion engine, characterized in that it has a composite nickel plating layer hardened to 00 or higher on its sliding surface.