JP6511126B1 - 摺動部材およびピストンリング - Google Patents
摺動部材およびピストンリング Download PDFInfo
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- JP6511126B1 JP6511126B1 JP2017251863A JP2017251863A JP6511126B1 JP 6511126 B1 JP6511126 B1 JP 6511126B1 JP 2017251863 A JP2017251863 A JP 2017251863A JP 2017251863 A JP2017251863 A JP 2017251863A JP 6511126 B1 JP6511126 B1 JP 6511126B1
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- 238000007373 indentation Methods 0.000 claims abstract description 73
- 229910021385 hard carbon Inorganic materials 0.000 claims abstract description 40
- 238000009826 distribution Methods 0.000 claims abstract description 32
- 230000007423 decrease Effects 0.000 claims abstract description 11
- 239000000758 substrate Substances 0.000 claims description 41
- 239000000463 material Substances 0.000 claims description 28
- 230000003746 surface roughness Effects 0.000 claims description 11
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 150000004767 nitrides Chemical class 0.000 claims description 4
- 150000001247 metal acetylides Chemical class 0.000 claims description 3
- 229910052750 molybdenum Inorganic materials 0.000 claims description 3
- 229910052721 tungsten Inorganic materials 0.000 claims description 3
- 229910052720 vanadium Inorganic materials 0.000 claims description 3
- 239000010408 film Substances 0.000 description 141
- 238000012360 testing method Methods 0.000 description 44
- 239000010410 layer Substances 0.000 description 31
- 238000000034 method Methods 0.000 description 22
- 230000000052 comparative effect Effects 0.000 description 20
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- 238000010849 ion bombardment Methods 0.000 description 14
- 238000007733 ion plating Methods 0.000 description 12
- 230000002093 peripheral effect Effects 0.000 description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 8
- 229910052799 carbon Inorganic materials 0.000 description 8
- 229910003460 diamond Inorganic materials 0.000 description 8
- 239000010432 diamond Substances 0.000 description 8
- 230000001965 increasing effect Effects 0.000 description 8
- 238000005498 polishing Methods 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 7
- 238000012545 processing Methods 0.000 description 7
- 239000011248 coating agent Substances 0.000 description 6
- 238000000576 coating method Methods 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 5
- 239000002344 surface layer Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000009661 fatigue test Methods 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 238000012805 post-processing Methods 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000011651 chromium Substances 0.000 description 3
- 238000010891 electric arc Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 238000005240 physical vapour deposition Methods 0.000 description 3
- 239000013074 reference sample Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 238000004299 exfoliation Methods 0.000 description 2
- 238000007541 indentation hardness test Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910000639 Spring steel Inorganic materials 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- -1 cemented carbide Inorganic materials 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- DYRBFMPPJATHRF-UHFFFAOYSA-N chromium silicon Chemical compound [Si].[Cr] DYRBFMPPJATHRF-UHFFFAOYSA-N 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910001105 martensitic stainless steel Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
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- 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
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- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
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- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F5/00—Piston rings, e.g. associated with piston crown
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- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/06—Sliding surface mainly made of metal
- F16C33/12—Structural composition; Use of special materials or surface treatments, e.g. for rust-proofing
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Abstract
Description
[1]基材と、該基材の上に形成された硬質炭素皮膜と、を有する摺動部材であって、
前記硬質炭素皮膜は、前記基材側から前記硬質炭素皮膜の表面側に向かってインデンテーション硬さが漸減し、
前記硬質炭素皮膜は、その膜厚をTtotal(μm)とし、その前記基材側からの厚さ位置をT(μm)として、0≦T/Ttotal≦0.6におけるインデンテーション硬さ分布がT/Ttotalを変数とする第1の直線で近似され、0.9≦T/Ttotal≦1におけるインデンテーション硬さ分布がT/Ttotalを変数とする第2の直線で近似され、
さらに、前記第1の直線のT=0μmにおける前記硬質炭素皮膜のインデンテーション硬さをH1(GPa)とし、前記第1の直線と前記第2の直線との交点における前記硬質炭素皮膜のインデンテーション硬さをH2(GPa)とし、該交点における前記厚さ位置をT2(μm)とし、前記第2の直線のT=Ttotalにおける前記硬質炭素皮膜のインデンテーション硬さをH3(GPa)としたとき、前記H2および前記T2が下記(1)式および下記(2)式を満たすことを特徴とする摺動部材。
記
(H3−H1)×T2/Ttotal+H1<H2≦0.9×H1・・・(1)
0.6≦T2/Ttotal≦0.9・・・(2)
記
H2≧0.6×H1・・・(3)
記
2≦b/a≦30・・・(4)
図1を参照して、本実施形態による摺動部材100は、基材10と、基材10の上に形成された硬質炭素皮膜12と、を有する。
本実施形態における基材10は、摺動部材として必要な強度を有するものであれば特に限定されないが、基材10の材料としては、例えば、鉄、鋳鉄、超硬合金、ステンレス鋼、アルミニウム合金など導電性を有する材料が挙げられる。また、基材10の材料を鉄系材料とする場合は、焼入れ及び焼戻しなどの硬化処理や窒化処理を施してもよい。なお、摺動部材100をピストンリングとして用いる場合には、従来から適用されているマルテンサイト系ステンレス鋼、バネ鋼、炭素鋼などを基材に用いることが好ましい。
本実施形態における硬質炭素皮膜12は、ダイヤモンドライクカーボン(DLC:Diamond Like Carbon)皮膜12である。以下では、図2を参照して、DLC皮膜12の特性を説明する。
T=(a’+b)×a/φ
ここで、上記換算式は、一般に薄膜の膜厚測定に用いられるカロテストにおいて膜厚を算出するための計算式を表面が曲面となるDLC皮膜に好適に適用したものである。図3(C)も参照して、aはDLC皮膜と基材(あるいは中間層)との境界から試験方向に沿った距離であり、bは基材(あるいは中間層)の露出面の試験方向に沿った長さであり、a’(=a)はカロテストの計算式に合わせるためのパラメータであり、φはピストンリングの呼称径である。
0.6≦T2/Ttotal≦0.9・・・(2)
図4を参照して、本発明の一実施形態によるピストンリング200は、上記の摺動部材100からなるものであり、その外周面20が図1に示すDLC皮膜の表面12Aとなる。ピストンリング200は、摺動面となる外周面20が高い耐摩耗性と低い摩擦係数を両立し、かつ耐剥離性に優れたDLC皮膜の表面12Aとなっているので、高負荷の摺動環境下でも高い耐摩耗性と優れた耐剥離性が得られる。なお、ピストンリングの内周面22および上下面24A,24Bは、図1に示す構造とする必要はない。
各発明例および比較例において、既述の方法で、「試験面の長径」に対する「基材あるいは中間層の試験面の長径方向に沿った長さ」の比率が20%以下になるように、ピストンリングの外周面に斜め研磨を施して、インデンテーション硬さ試験を実施した。膜厚にもよるが、各発明例および比較例において、L/Ttotalは35〜100倍であった。インデンテーション硬さ試験機はエリオニクス社製のENT−1100aを用いた。また、押し込み荷重は6mNとし、試験面を5μmピッチの等間隔で圧子を連続的に押し込むことで、DLC膜厚の深さ方向の硬さ分布を得た。また、各発明例および比較例において、DLC皮膜の断面をSEM(Scanning Electron Microscope)にて観察することで膜厚を測定した。また、各発明例および比較例において、以下の方法により耐摩耗性(被膜寿命)、摩擦係数、及び耐剥離性を評価した。
各発明例および比較例において、簡易アブレッシブ摩耗試験を行った。簡易アブレッシブ摩耗試験では、ダイヤモンドペースを研磨剤としてDLC皮膜の表面に塗布し、図5(A)に示すように、DLC皮膜の表面上で鋼球を回転させることで研磨を行い、研磨痕を定期的に観察した。基材の表面が露出するまでの時間を摩滅時間とした。これは一般に薄膜の膜厚測定に用いられるカロテストを、研磨条件管理で簡易アブレッシブ摩耗試験としてみなすものである。また、各発明例および比較例に対して、以下の方法で基準サンプルを作製した。すなわち、基準サンプルとして、DLC皮膜の膜厚全域において、各発明例および比較例のH1と同じインデンテーション硬さを有するサンプルをイオンプレーティング法により作製した。試験片はas−coat状態とした。なお、DLC皮膜のインデンテーション硬さ以外は、各発明例および比較例と同様である。各基準サンプルに対して、同様の簡易アブレッシブ摩耗試験を行い、基材の表面が露出するまでの時間を基準摩滅時間とした。そして、各発明例および比較例について、摩滅時間比(=摩滅時間/基準摩滅時間)を算出して、耐摩耗性を評価した。評価結果を表1に示す。なお、摩滅時間比が0.70以上であれば、高い耐摩耗性(皮膜寿命)を有するとみなすことができるので、表1では、摩滅時間比が0.70以上の場合を「○」とし、0.70未満の場合を「×」とした。また、試験条件は次のとおりとした。
試験鋼球:SUJ2 φ31.75mm
ダイヤモンドペースト:0.25μm
鋼球回転速度:500rpm
各発明例および比較例において、実機試験の剥離を迅速に再現することができる評価として転動すべり疲労試験を行った。図5(B)に試験機の概略を示す。転動すべり疲労試験では、回転するドラム30と摺動する試験片32に繰り返し荷重を加えることで、比較的短時間でDLC皮膜の耐剥離性を確認することができる。ここで、試験片32は、各発明例および比較例におけるピストンリングの外周面の一部が当該転動すべり疲労試験における摺動面となるように、各ピストンリングを切断して得たものである。これらピストンリング外周は所定のラッピング加工でDLC表面を加工したものである。光学顕微鏡で、試験後の試験片32の摺動面における剥離の有無を観察することにより、耐剥離性を評価した。また、試験中の摩擦力を検出することで摩擦係数も評価した。ピストンリング外周表面の表面粗さともに評価結果を表1に示す。なお、表1では、摩擦係数が0.16以下の場合を「○」とし、0.16超えの場合を「×」とした。また、試験条件は次のとおりとした。
荷重:20〜50N、サインカーブ50Hz
相手材(ドラム):直径80mmのSUJ2材
摺動速度:正転逆転パターン運転(±10m/s)、速度±10m/sで20s保持
加速度:0.23m/s2
潤滑剤:無添加モーターオイル、0.1cc/min
温度:ドラム表面温度80℃
試験時間:正転逆転パターン運転を1サイクルとして10サイクル
摩擦係数:5サイクルまでの初期摩擦係数とする
10 基材
12 硬質炭素皮膜(DLC皮膜)
12A 摺動面
200 ピストンリング
20 外周面
22 内周面
24A,24B 上下面
30 ドラム
32 試験片
Claims (9)
- 基材と、該基材の上に形成された硬質炭素皮膜と、を有する摺動部材であって、
前記硬質炭素皮膜は、前記基材側から前記硬質炭素皮膜の表面側に向かってインデンテーション硬さが漸減し、
前記硬質炭素皮膜は、その膜厚をTtotal(μm)とし、その前記基材側からの厚さ位置をT(μm)として、0≦T/Ttotal≦0.6におけるインデンテーション硬さ分布がT/Ttotalを変数とする第1の直線で近似され、0.9≦T/Ttotal≦1におけるインデンテーション硬さ分布がT/Ttotalを変数とする第2の直線で近似され、
さらに、前記第1の直線のT=0μmにおける前記硬質炭素皮膜のインデンテーション硬さをH1(GPa)とし、前記第1の直線と前記第2の直線との交点における前記硬質炭素皮膜のインデンテーション硬さをH2(GPa)とし、該交点における前記厚さ位置をT2(μm)とし、前記第2の直線のT=Ttotalにおける前記硬質炭素皮膜のインデンテーション硬さをH3(GPa)としたときに、前記H2および前記T2が下記(1)式および下記(2)式を満たすことを特徴とする摺動部材。
記
(H3−H1)×T2/Ttotal+H1<H2≦0.9×H1・・・(1)
0.6≦T2/Ttotal≦0.9・・・(2) - 前記H2は、下記(3)式をさらに満たす、請求項1に記載の摺動部材。
記
H2≧0.6×H1・・・(3) - 前記第1の直線の傾きをaとし、前記第2の直線の傾きをbとしたとき、b/aが下記(4)式をさらに満たす、請求項1または2に記載の摺動部材。
記
2≦b/a≦30・・・(4) - 前記H1は30GPa以上である、請求項1〜3のいずれか一項に記載の摺動部材。
- 前記H3は5GPa以上20GPa以下である、請求項1〜4のいずれか一項に記載の摺動部材。
- 前記Ttotalは3μm以上である、請求項1〜5のいずれか一項に記載の摺動部材。
- 前記硬質炭素皮膜の表面粗さRaが0.15μm以下である、請求項1〜6のいずれか一項に記載の摺動部材。
- 前記基材と前記硬質炭素皮膜との間に、Cr、Ti、Co、V、Mo、及びW、並びにそれらの炭化物、窒化物、及び炭窒化物から選択された一つ以上の材料からなる中間層を有する、請求項1〜7のいずれか一項に記載の摺動部材。
- 請求項1〜8のいずれか一項に記載の摺動部材からなるピストンリング。
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