JPH11350196A - BN composite nickel-tungsten alloy film, method of forming the same, and piston ring - Google Patents
BN composite nickel-tungsten alloy film, method of forming the same, and piston ringInfo
- Publication number
- JPH11350196A JPH11350196A JP18160498A JP18160498A JPH11350196A JP H11350196 A JPH11350196 A JP H11350196A JP 18160498 A JP18160498 A JP 18160498A JP 18160498 A JP18160498 A JP 18160498A JP H11350196 A JPH11350196 A JP H11350196A
- Authority
- JP
- Japan
- Prior art keywords
- film
- tungsten alloy
- piston ring
- alloy film
- composite nickel
- 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.)
- Pending
Links
- 229910001080 W alloy Inorganic materials 0.000 title claims abstract description 21
- 239000002131 composite material Substances 0.000 title claims abstract description 12
- MOWMLACGTDMJRV-UHFFFAOYSA-N nickel tungsten Chemical compound [Ni].[W] MOWMLACGTDMJRV-UHFFFAOYSA-N 0.000 title claims abstract description 12
- 238000000034 method Methods 0.000 title description 4
- 239000002245 particle Substances 0.000 claims abstract description 10
- 239000000843 powder Substances 0.000 claims abstract description 10
- 239000000203 mixture Substances 0.000 claims abstract description 9
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 5
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 4
- 238000007747 plating Methods 0.000 claims description 27
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 9
- 239000003093 cationic surfactant Substances 0.000 claims description 4
- 238000009713 electroplating Methods 0.000 claims description 4
- CMPGARWFYBADJI-UHFFFAOYSA-L tungstic acid Chemical compound O[W](O)(=O)=O CMPGARWFYBADJI-UHFFFAOYSA-L 0.000 claims description 3
- HLLDCWDCVRXWPL-UHFFFAOYSA-N N.[Ni].[W] Chemical compound N.[Ni].[W] HLLDCWDCVRXWPL-UHFFFAOYSA-N 0.000 claims 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims 1
- 239000010931 gold Substances 0.000 claims 1
- 229910052737 gold Inorganic materials 0.000 claims 1
- ZODDGFAZWTZOSI-UHFFFAOYSA-N nitric acid;sulfuric acid Chemical compound O[N+]([O-])=O.OS(O)(=O)=O ZODDGFAZWTZOSI-UHFFFAOYSA-N 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- 238000005299 abrasion Methods 0.000 abstract description 8
- 229910052582 BN Inorganic materials 0.000 description 31
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 31
- 239000000463 material Substances 0.000 description 13
- 239000011651 chromium Substances 0.000 description 10
- 230000013011 mating Effects 0.000 description 8
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 6
- 229910052804 chromium Inorganic materials 0.000 description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 229910001141 Ductile iron Inorganic materials 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 2
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- LGQLOGILCSXPEA-UHFFFAOYSA-L nickel sulfate Chemical compound [Ni+2].[O-]S([O-])(=O)=O LGQLOGILCSXPEA-UHFFFAOYSA-L 0.000 description 2
- 229910000363 nickel(II) sulfate Inorganic materials 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 125000005211 alkyl trimethyl ammonium group Chemical group 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000010907 mechanical stirring Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
Landscapes
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
(57)【要約】
【解決手段】 ＮｉとＷとの組成比率が重量比で７０：
３０〜４０：６０であり、かつ平均粒径が０．５〜１０
μｍのＢＮ粉末が０．１〜２０重量％分散共析されてな
ることを特徴とするＢＮ複合ニッケル−タングステン合
金皮膜。
【効果】 本発明のＮｉ−Ｗ−ＢＮ皮膜は、耐磨耗性能
に優れ、ピストンリング用皮膜として好適である。(57) [Summary] A composition ratio of Ni and W is 70:
30 to 40:60, and the average particle size is 0.5 to 10
A BN composite nickel-tungsten alloy film, characterized in that 0.1 to 20% by weight of BN powder is dispersed and eutectoid. The Ni-W-BN film of the present invention has excellent abrasion resistance and is suitable as a film for a piston ring.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、良好な耐磨耗性能
を有するＢＮ（ボロンナイトライド）複合ニッケル−タ
ングステン合金皮膜及びその形成方法並びに該皮膜が被
覆されたピストンリングに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a BN (boron nitride) composite nickel-tungsten alloy film having good wear resistance, a method for forming the same, and a piston ring coated with the film.
【０００２】[0002]
【従来の技術及び発明が解決しようとする課題】従来、
ピストンリングは、硬質クロムめっき皮膜等の硬質の皮
膜を形成し、その磨耗を低減することが行われている。
しかし、ピストンリングが適用される自動車エンジンの
シリンダー（相手材）には、球状黒鉛鋳鉄などの軟らか
い金属が多用されるので、クロムめっき皮膜（Ｃｒ皮
膜）等の硬質の皮膜をピストンリングに用いると、それ
自体の耐磨耗性能は良好であるが、相手材の磨耗が著し
い。従って、ピストンリング用として有効なめっき皮膜
が望まれていた。またこの場合、クロムめっき液は、高
濃度の無水クロム酸溶液であることから、地球環境にそ
ぐわず、公害の問題があるため、この点も解決課題であ
った。2. Description of the Related Art
The piston ring forms a hard film such as a hard chromium plating film and reduces its wear.
However, since a soft metal such as spheroidal graphite cast iron is often used for a cylinder (a counterpart material) of an automobile engine to which the piston ring is applied, if a hard film such as a chromium plating film (Cr film) is used for the piston ring, , Itself has good wear resistance, but the mating material is significantly worn. Therefore, a plating film effective for piston rings has been desired. In this case, since the chromium plating solution is a solution of chromic anhydride having a high concentration, it is not suitable for the global environment and has a problem of pollution.
【０００３】本発明は上記事情に鑑みなされたもので、
ピストンリング用に用いた場合に相手材の磨耗を軽減で
き、耐磨耗性能に優れたＢＮ複合ニッケル−タングステ
ン合金皮膜及びその形成方法並びに該皮膜を形成したピ
ストンリングを提供することを目的とする。[0003] The present invention has been made in view of the above circumstances,
An object of the present invention is to provide a BN composite nickel-tungsten alloy film excellent in abrasion resistance, which can reduce wear of a mating material when used for a piston ring, a method of forming the same, and a piston ring formed with the film. .
【０００４】[0004]
【課題を解決するための手段及び発明の実施の形態】本
発明者は、上記目的を達成するため鋭意検討を行った結
果、硬質のニッケル−タングステン合金皮膜（Ｎｉ−Ｗ
皮膜）に軟質のＢＮを共析させることにより、自動車エ
ンジン内部と同じ高温給油環境において、耐磨耗性能に
優れた皮膜が得られ、ピストンリング用皮膜として有効
であることを知見し、本発明をなすに至った。Means for Solving the Problems and Embodiments of the Invention The present inventors have conducted intensive studies to achieve the above object, and as a result, have found that a hard nickel-tungsten alloy film (Ni-W
By eutecting soft BN into the film, a film excellent in abrasion resistance can be obtained in the same high-temperature lubricating environment as the inside of an automobile engine, and found to be effective as a film for piston rings. Was reached.
【０００５】即ち、本発明は、 請求項１：ＮｉとＷとの組成比率が重量比で７０：３０
〜４０：６０であり、かつ平均粒径が０．５〜１０μｍ
のＢＮ粉末が０．１〜２０重量％分散共析されてなるこ
とを特徴とするＢＮ複合ニッケル−タングステン合金皮
膜、 請求項２：くえん酸４０〜１００ｇ／Ｌ、硫酸ニッケル
３０〜１００ｇ／Ｌ、タングステン酸７０〜１３０ｇ／
Ｌ、カチオン界面活性剤１〜５０００ｐｐｍ、平均粒径
０．５〜１０μｍのＢＮ粉末を含有し、アンモニア水で
ｐＨを４〜８に調整したニッケル−タングステン合金め
っき浴に、被めっき物を浸漬し、陰極電流密度５〜２０
Ａ／ｄｍ2 で電気めっきすることを特徴とする請求項１
記載のＢＮ複合ニッケル−タングステン合金皮膜、 請求項３：請求項１記載のＢＮ複合ニッケル−タングス
テン合金皮膜が形成されてなるピストンリングを提供す
る。That is, the present invention relates to: (1) The composition ratio of Ni and W is 70:30 by weight.
４０40: 60 and the average particle size is 0.5 to 10 μm
Of BN powder of 0.1-20% by weight
BN composite nickel-tungsten alloy skin characterized by the following:
Membrane, claim 2: citric acid 40-100 g / L, nickel sulfate
30-100 g / L, tungstic acid 70-130 g /
L, 1-5000 ppm of cationic surfactant, average particle size
Contains BN powder of 0.5 to 10 μm, with ammonia water
Nickel-tungsten alloy with pH adjusted to 4-8
The object to be plated is immersed in a plating bath, and the cathode current density is 5 to 20.
A / dmTwo 2. An electroplating method according to claim 1.
The BN composite nickel-tungsten alloy film according to claim 3. The BN composite nickel-tungsten according to claim 1.
Provide a piston ring on which a ten alloy film is formed
You.
【０００６】本発明に従って形成したＮｉ−Ｗ合金マト
リックスにＢＮを共析しためっき皮膜は、高速摺動での
動摩擦係数が小さくなり、皮膜自体は若干磨耗するが、
相手材を磨耗しない長所を有する。自動車エンジンのシ
リンダーには球状黒鉛鋳鉄など軟らかい金属が多用され
るので、相手材シリンダーを磨耗しない性能はエンジン
のピストンリングの皮膜材料として適している。[0006] The plating film formed by codepositing BN on the Ni-W alloy matrix formed according to the present invention has a low dynamic friction coefficient at high speed sliding, and the film itself is slightly worn.
It has the advantage of not wearing the mating material. Since a soft metal such as spheroidal graphite cast iron is frequently used for a cylinder of an automobile engine, its performance of not abrading a mating cylinder is suitable as a coating material for a piston ring of an engine.
【０００７】即ち、自動車エンジン内部の３５０℃・給
油の環境下で硬質のＮｉ−Ｗ合金に潤滑性のあるＢＮを
共析した皮膜をピストンリングに用い、球状黒鉛鋳鉄を
シリンダー（相手材）に用いて摺動させると磨耗は双方
で軽減する。給油して使用すれば若干のＢＮの粉末が油
の中に潤滑剤として分散した状態となり、優れた耐磨耗
性環境が実現する。相手材（シリンダー）を磨耗しない
という性能はエンジンのピストンリングの皮膜材料とし
て有効である。しかも、Ｃｒ皮膜のように公害の問題を
発生せず、Ｃｒに代わる皮膜として利用できる。このＮ
ｉ−Ｗ合金にＢＮを共析した皮膜は、自動車エンジンに
限られず、耐磨耗性を必要とする摺動部分にＣｒの代替
品として利用できる。That is, in a 350 ° C. oil supply environment inside a car engine, a hard Ni—W alloy is coated with a BN having lubricity on a piston ring, and a spheroidal graphite cast iron is used as a cylinder (a mating material). When used and slid, wear is reduced on both sides. If used after lubrication, some BN powder will be dispersed in the oil as a lubricant, and an excellent wear-resistant environment will be realized. The performance of not abrading the mating material (cylinder) is effective as a coating material for the piston ring of the engine. Moreover, it does not cause a problem of pollution unlike the Cr film, and can be used as a film that replaces Cr. This N
A film obtained by codepositing BN on an i-W alloy is not limited to an automobile engine, and can be used as a substitute for Cr for a sliding portion requiring abrasion resistance.
【０００８】以下、本発明につき更に詳しく説明する。
本発明のＢＮ粉末が分散共析されたＢＮ複合ニッケル−
タングステン合金皮膜（以下、Ｎｉ−Ｗ−ＢＮ皮膜とい
う）は、ＮｉとＷとの組成比率が、重量比として７０：
３０〜４０：６０であり、好ましくは５５：４５〜４
５：５５である。Ｎｉ量が多すぎると、マトリックスと
なるＮｉ−Ｗ合金の硬度が低下するという問題があり、
またＮｉ量が少なすぎると、Ｎｉ−Ｗ合金の形成そのも
のが困難となるという問題がある。このＮｉ−Ｗ皮膜に
分散、共析されるＢＮ粉末の含有量は、皮膜中０．１〜
２０重量％、好ましくは０．５〜５重量％、更に好まし
くは１〜３重量％である。ＢＮ量が０．１重量％より少
ないと、油中に分散して潤滑剤として寄与する量が少な
いため、潤滑性能が発揮されない。２０重量％より多い
と、めっき皮膜からの脱落が多く、皮膜の消耗が激しい
という不利が生じる。また、このＢＮ粉末の平均粒径は
０．５〜１０μｍ、好ましくは１〜３μｍであり、平均
粒径が０．５μｍより小さい場合は、ＢＮ共析量の増加
に伴いめっき浴中のＢＮ消費量が激しい。１０μｍより
大きい場合は、耐磨耗性能が低下するという問題が生じ
る。Hereinafter, the present invention will be described in more detail.
BN composite nickel in which BN powder of the present invention is dispersed and eutectoid
In a tungsten alloy film (hereinafter, referred to as a Ni-W-BN film), the composition ratio of Ni and W is 70:
30:40:60, preferably 55: 45-4
5:55. If the amount of Ni is too large, there is a problem that the hardness of the Ni-W alloy serving as a matrix decreases,
On the other hand, if the amount of Ni is too small, there is a problem that formation of the Ni-W alloy itself becomes difficult. The content of the BN powder dispersed and eutectoid in the Ni—W film is 0.1 to
It is 20% by weight, preferably 0.5-5% by weight, more preferably 1-3% by weight. If the BN amount is less than 0.1% by weight, the amount of the BN dispersed in oil and contributing as a lubricant is small, so that the lubrication performance is not exhibited. If the amount is more than 20% by weight, there is a disadvantage that the film is often dropped from the plating film, and the film is greatly consumed. The average particle size of the BN powder is 0.5 to 10 μm, preferably 1 to 3 μm. When the average particle size is smaller than 0.5 μm, the BN consumption in the plating bath increases with an increase in the amount of BN eutectoid. The amount is intense. If it is larger than 10 μm, there arises a problem that abrasion resistance performance is reduced.
【０００９】上記Ｎｉ−Ｗ−ＢＮ皮膜は、くえん酸４０
〜１００ｇ／Ｌ、硫酸ニッケル３０〜１００ｇ／Ｌ、タ
ングステン酸７０〜１３０ｇ／Ｌ、カチオン界面活性剤
１〜５０００ｐｐｍ、特に１００〜１０００ｐｐｍ、上
記ＢＮ粉末を１〜１００ｇ／Ｌ、特に１０〜５０ｇ／Ｌ
含有し、アンモニア水でｐＨを４〜８、特に４〜６に調
整した電気めっき浴を使用して、所用の被めっき物に電
気めっきを行うことにより形成することができる。The above-mentioned Ni-W-BN film is made of citric acid 40
-100 g / L, nickel sulfate 30-100 g / L, tungstic acid 70-130 g / L, cationic surfactant 1-5000 ppm, especially 100-1000 ppm, and the above-mentioned BN powder 1-100 g / L, especially 10-50 g / L.
It can be formed by performing electroplating on an object to be plated using an electroplating bath containing the aqueous solution and adjusting the pH to 4 to 8, particularly 4 to 6, with aqueous ammonia.
【００１０】この場合、カチオン界面活性剤は、ＢＮに
吸着することにより、ＢＮに濡れ性を付与し、複合めっ
き浴中へのＢＮの分散を容易にし、ＢＮの共析に寄与す
るという作用を有し、例えばアルキルジメチルベンジル
アンモニウム塩、アルキルトリメチルアンモニウム塩、
パーフルオロアルキルトリメチルアンモニウム塩等を用
いることができる。In this case, the cationic surfactant has an effect of imparting wettability to BN by adsorbing to BN, facilitating dispersion of BN in the composite plating bath, and contributing to BN eutectoid. Having, for example, an alkyldimethylbenzylammonium salt, an alkyltrimethylammonium salt,
A perfluoroalkyltrimethylammonium salt or the like can be used.
【００１１】めっき条件は適宜選定することができる
が、陰極電流密度（Ｄk）は５〜２０Ａ／ｄｍ2 であり、
まためっき温度は５０〜８０℃とすることができる。な
お、陽極としてはステンレススチールを用いることがで
き、撹拌はカソードロッキング、ポンプによる液流動、
スターラーによる機械撹拌、穴明き板のめっき槽内の上
下動による撹拌などを採用することができる。また、上
記被めっき物の種類は特に制限されず、スチール、鋳鉄
などによって形成したものを用いることができる。The plating conditions can be appropriately selected.
Is the cathode current density (Dk) Is 5 to 20 A / dmTwo And
Further, the plating temperature can be 50 to 80 ° C. What
You can use stainless steel for the anode.
Stirring, cathode rocking, liquid flow by pump,
Mechanical stirring by stirrer, perforated plate plating tank
Stirring by lowering can be adopted. Also on
The type of plating object is not particularly limited, and steel, cast iron
What was formed by such as can be used.
【００１２】本発明に係るピストンリングは、鉄鋼、特
殊鋼等による基体に、上述した方法により上記Ｎｉ−Ｗ
−ＢＮ皮膜を形成したものである。この場合、この皮膜
厚さは適宜選定されるが、５〜１００μｍ、特に１０〜
５０μｍとすることが、この皮膜の特性を効果的に達成
する点から好ましい。[0012] The piston ring according to the present invention is formed on a substrate made of steel, special steel, or the like by using the above-described Ni-W
-A BN film was formed. In this case, the thickness of this film is appropriately selected, but is 5 to 100 μm, particularly 10 to 100 μm.
It is preferable that the thickness be 50 μm from the viewpoint of effectively achieving the characteristics of the film.
【００１３】[0013]
【発明の効果】本発明のＮｉ−Ｗ−ＢＮ皮膜は、耐磨耗
性能に優れ、ピストンリング用皮膜として好適である。The Ni-W-BN film of the present invention has excellent wear resistance and is suitable as a film for a piston ring.
【００１４】[0014]
【実施例】以下、実施例と比較例を示し、本発明を具体
的に説明するが、本発明は下記実施例に制限されるもの
ではない。EXAMPLES The present invention will be described below in detail with reference to examples and comparative examples, but the present invention is not limited to the following examples.
【００１５】〔実施例１〕基材としてピストン用鋼材か
ら切り出した１２ｍｍ×１０ｍｍ×６ｍｍの鉄鋼ブロッ
クを用い、常法により前処理を行った後、下記組成のめ
っき液にて下記条件で電気めっきを行い、平均粒径０．
８μｍのＢＮが複合されたＮｉ−Ｗ合金めっき皮膜を形
成した。Example 1 A 12 mm × 10 mm × 6 mm steel block cut from a steel material for a piston was used as a base material, pretreated by a conventional method, and then electroplated with a plating solution having the following composition under the following conditions. And average particle size of 0.
An Ni-W alloy plating film in which BN of 8 μm was composited was formed.
【００１６】 [0016]
【００１７】〔実施例２〕下記組成のめっき液を用い、
下記条件でめっきした以外は実施例１と同様にして、平
均粒径１．０μｍのＢＮが複合されたＮｉ−Ｗ合金めっ
き皮膜を形成した。Example 2 Using a plating solution having the following composition,
A Ni-W alloy plating film in which BN having an average particle size of 1.0 μm was composited was formed in the same manner as in Example 1 except that plating was performed under the following conditions.
【００１８】 [0018]
【００１９】〔実施例３〕下記組成のめっき液を用い、
下記条件でめっきした以外は実施例１と同様にして、平
均粒径３．２μｍのＢＮが複合されたＮｉ−Ｗ合金めっ
き皮膜を形成した。Example 3 Using a plating solution having the following composition,
A Ni-W alloy plating film in which BN having an average particle size of 3.2 μm was formed in the same manner as in Example 1 except that plating was performed under the following conditions.
【００２０】 [0020]
【００２１】〔比較例〕実施例と同様の基材に下記組成
のクロムめっき液を用い、下記条件で１５０分間めっき
し、７０μｍのクロムめっき皮膜を形成した。Comparative Example A chromium plating film having a composition of 70 μm was formed on the same substrate as that of the example using a chromium plating solution having the following composition under the following conditions for 150 minutes.
【００２２】 [0022]
【００２３】上記実施例，比較例で得られためっき皮膜
について、自動車エンジンシリンダーとピストンリング
との磨耗を確実に具現し得る磨耗試験機を用いて、以下
のように磨耗試験を行った。The plating films obtained in the above Examples and Comparative Examples were subjected to an abrasion test as follows using an abrasion tester capable of reliably realizing abrasion between an automobile engine cylinder and a piston ring.
【００２４】図１は、３５０℃、給油、摩擦面３０００
ｒｐｍの条件で磨耗試験を実施した結果である。試験片
は１２ｍｍ×１０ｍｍ×６ｍｍの鉄鋼製ブロックに上記
めっき皮膜を形成したもので、相手材は直径４５ｍｍ、
厚み６ｍｍの球状黒鉛鋳鉄である。摺動面は試験片の１
０ｍｍ×６ｍｍ面と相手材の半径約１６ｍｍの円周上
で、円周長は約１００ｍｍとなる。回転速度が３０００
ｒｐｍでは摺動面の相対速度は約１８ｋｍ／ｈｒとな
る。図１の縦軸は１時間経過後の試験片及び相手材の磨
耗量（ｍｇ／ｈｒ）である。FIG. 1 shows a condition where the temperature is 350 ° C.
It is a result of performing a wear test under the condition of rpm. The test piece is a steel block of 12 mm x 10 mm x 6 mm with the above-mentioned plating film formed thereon.
6 mm thick spheroidal graphite cast iron. The sliding surface is the test piece 1
On a 0 mm × 6 mm surface and the circumference of the counterpart material having a radius of about 16 mm, the circumference length is about 100 mm. Rotation speed 3000
At rpm, the relative speed of the sliding surface is about 18 km / hr. The vertical axis in FIG. 1 represents the wear amount (mg / hr) of the test piece and the mating material after one hour.
【００２５】図１の結果から明らかなように、Ｎｉ−Ｗ
皮膜にＢＮが共析した皮膜は、クロムに比較し、それ自
体は若干磨耗するが、相手材の磨耗量は非常に少なかっ
た。従って自動車エンジンのピストンリングに適用する
ことにより、シリンダーの磨耗は軽減され、ピストンリ
ングも併せて磨耗が軽減されることが想定される。As is apparent from the results shown in FIG.
The film in which BN was eutectoid was slightly worn by itself as compared with chromium, but the amount of wear of the mating material was very small. Therefore, by applying the present invention to a piston ring of an automobile engine, it is assumed that the wear of the cylinder is reduced and the wear of the piston ring is also reduced.
【図１】実施例及び比較例のめっき皮膜の磨耗試験の結
果を示すグラフである。FIG. 1 is a graph showing the results of a wear test of plating films of Examples and Comparative Examples.
Claims (3)
３０〜４０：６０であり、かつ平均粒径が０．５〜１０
μｍのＢＮ粉末が０．１〜２０重量％分散共析されてな
ることを特徴とするＢＮ複合ニッケル−タングステン合
金皮膜。1. The composition ratio of Ni and W is 70:
30 to 40:60, and the average particle size is 0.5 to 10
A BN composite nickel-tungsten alloy film, characterized in that 0.1 to 20% by weight of BN powder is dispersed and eutectoid.
ケル３０〜１００ｇ／Ｌ、タングステン酸７０〜１３０
ｇ／Ｌ、カチオン界面活性剤１〜５０００ｐｐｍ、平均
粒径０．５〜１０μｍのＢＮ粉末を含有し、アンモニア
水でｐＨを４〜８に調整したニッケル−タングステン合
金めっき浴に、被めっき物を浸漬し、陰極電流密度５〜
２０Ａ／ｄｍ2 で電気めっきすることを特徴とする請求
項１記載のＢＮ複合ニッケル−タングステン合金皮膜。2. Citric acid 40 to 100 g / L, sulfuric acid nitric acid
Kel 30-100 g / L, tungstic acid 70-130
g / L, 1-5000 ppm of cationic surfactant, average
It contains BN powder having a particle size of 0.5 to 10 μm and contains ammonia
Nickel-tungsten alloy adjusted to pH 4-8 with water
The object to be plated is immersed in a gold plating bath, and the cathode current density is 5
20A / dmTwo Claims: Electroplating with
Item 3. A BN composite nickel-tungsten alloy film according to item 1.
グステン合金皮膜が形成されてなるピストンリング。3. A piston ring formed with the BN composite nickel-tungsten alloy film according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18160498A JPH11350196A (en) | 1998-06-12 | 1998-06-12 | BN composite nickel-tungsten alloy film, method of forming the same, and piston ring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18160498A JPH11350196A (en) | 1998-06-12 | 1998-06-12 | BN composite nickel-tungsten alloy film, method of forming the same, and piston ring |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11350196A true JPH11350196A (en) | 1999-12-21 |
Family
ID=16103721
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18160498A Pending JPH11350196A (en) | 1998-06-12 | 1998-06-12 | BN composite nickel-tungsten alloy film, method of forming the same, and piston ring |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11350196A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1132499A3 (en) * | 2000-03-07 | 2004-02-25 | Ebara Corporation | Alloy coating, method for forming the same, and member for high temperature apparatuses |
-
1998
- 1998-06-12 JP JP18160498A patent/JPH11350196A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1132499A3 (en) * | 2000-03-07 | 2004-02-25 | Ebara Corporation | Alloy coating, method for forming the same, and member for high temperature apparatuses |
| US6899926B2 (en) | 2000-03-07 | 2005-05-31 | Ebara Corporation | Alloy coating, method for forming the same, and member for high temperature apparatuses |
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