JP6503393B2 - 摺動材料及びその製造方法、並びに摺動部材及び軸受装置 - Google Patents
摺動材料及びその製造方法、並びに摺動部材及び軸受装置 Download PDFInfo
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- JP6503393B2 JP6503393B2 JP2017043927A JP2017043927A JP6503393B2 JP 6503393 B2 JP6503393 B2 JP 6503393B2 JP 2017043927 A JP2017043927 A JP 2017043927A JP 2017043927 A JP2017043927 A JP 2017043927A JP 6503393 B2 JP6503393 B2 JP 6503393B2
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- copper alloy
- sliding
- sliding material
- substrate
- alloy layer
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- 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- 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
- F16C33/121—Use of special materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D13/00—Centrifugal casting; Casting by using centrifugal force
- B22D13/02—Centrifugal casting; Casting by using centrifugal force of elongated solid or hollow bodies, e.g. pipes, in moulds rotating around their longitudinal axis
- B22D13/023—Centrifugal casting; Casting by using centrifugal force of elongated solid or hollow bodies, e.g. pipes, in moulds rotating around their longitudinal axis the longitudinal axis being horizontal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/08—Casting in, on, or around objects which form part of the product for building-up linings or coverings, e.g. of anti-frictional metal
- B22D19/085—Casting in, on, or around objects which form part of the product for building-up linings or coverings, e.g. of anti-frictional metal of anti-frictional metal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/16—Casting in, on, or around objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
- B22D27/045—Directionally solidified castings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/013—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium
- B32B15/015—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium the said other metal being copper or nickel or an alloy thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/18—Layered products comprising a layer of metal comprising iron or steel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/0084—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ carbon or graphite as the main non-metallic constituent
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- C22C32/0089—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with other, not previously mentioned inorganic compounds as the main non-metallic constituent, e.g. sulfides, glass
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C—CHEMISTRY; METALLURGY
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- C22C9/02—Alloys based on copper with tin as the next major constituent
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- C—CHEMISTRY; METALLURGY
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
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- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
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- F16C17/10—Sliding-contact bearings for exclusively rotary movement for both radial and axial load
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- Y10T428/263—Coating layer not in excess of 5 mils thick or equivalent
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Description
また、特許文献3のように、鋼材側背面から冷却剤を衝突させて1方向凝固させる方法においては、急速な冷却によって合金強度を向上させることができるが、銅合金の凝固収縮の速度が大きくなり、銅合金と鋼材とが剥離しようとする力が大きくなるため、接合を阻害して接合力の低下につながる。
Snを2.0〜15.0質量%、
Biを0〜30.0質量%、
Al、Zn、Mn、Si、Ni、Fe、P、Zr、Ti、Mgのうちから選ばれる1種または2種以上を総量で5.0質量%以下
を含み、残部が銅および不可避不純物である。
銅合金は、さらに、MoS2、グラファイトのいずれか又は両方を総量で10.0体積%以下含むことができる。
一具体例によれば、冷却剤は水または油とすることができる。
一具体例によれば、基材を準備するステップが、1つまたは複数の基材からなる円筒形状体を成形するステップを含み、鋳込むステップが、円筒形状体を、円筒形状の中心軸線の周りに回転させながら鋳込むステップを含む。
基材2は、銅合金層3を支持して摺動材料1の強度を確保するものである。その素材は、例えば亜共析鋼、共析鋼、過共析鋼、鋳鉄、高速度鋼、工具鋼、オーステナイト系ステンレス鋼、フェライト系ステンレス鋼などの一般市販される鉄基材料、あるいは純銅、リン青銅、黄銅、クロム銅、ベリリウム銅、コルソン合金など銅基材料でよいが、他の材料でもよい。
摺動材料は、基材の厚さが1.0〜25.0mmであり、銅合金層の厚さが0.1〜3.0mmであることが好ましい。
さらに、本発明による摺動材料1は、銅合金層3上にオーバーレイを施してもよい。オーバーレイは、例えば、Sn、Biなどの軟質金属層、あるいは固体潤滑剤を分散した樹脂層など、周知の材料を使用できる。なお、オーバーレイを施した場合でも、銅合金層3のオーバーレイを施した摺動側表面を便宜的に摺動面という。
銅合金層3は、摺動本体部6と傾斜部5を含む。摺動本体部6は銅合金層3の摺動層として機能する主要部であり、その表面が本摺動材料1からなる摺動部材の摺動面8を形成している。したがって、摺動本体部6の組成、とりわけ錫濃度は、銅合金層3を形成する銅合金の組成と概ね同じである。傾斜部5は、摺動本体部6と基材2との間に位置し、その一方の表面が銅合金層3と基材の接合面7を形成する。傾斜部5内では、錫濃度が界面7に向かって減少している。銅合金層3内の錫濃度は、摺動本体部6では概ね一定でありその値は銅合金の組成と概ね同じであるが、傾斜部5では摺動本体部6との界面から接合面7に向かって減少する。ただし、傾斜部5内の錫濃度の減少は、必ずしも単調に減少していなくてもよく、階段状でもよく、途中で増加することがあってもよい。すなわち、傾斜部5内で錫濃度が全体として接合面7に向かって減少すればよい。しかし、傾斜部5において摺動本体部6側から接合面7側へ錫濃度値が単調に減少する形態が好ましい。
傾斜部5内では、摺動本体部6から界面7に向かって、錫濃度の減少に伴って強度は小さくなるが靭性、延性が大きくなっていく。そのため、傾斜部5は、凝固収縮による接合面7への負荷や摺動中の剪断応力が接合面に応力集中することを軽減する「応力緩和層」の役割を果たし、剪断応力に対する接合強度を向上させる。これにより、錫含有銅合金による摺動性、耐焼付性、耐摩耗性を維持しながら、基材2との接合強度にも優れた摺動材料1が得られる。
さらに、この摺動材料1は、銅合金層3と基材2とを直接接合しており、高価な銅めっき付き鋼材を使用する必要が無いので摺動材料1のコストを低減できる。
通常、傾斜部5内で最大錫濃度となるのは摺動本体部6と接する位置であり、基材との界面7近傍において錫濃度は最小値をとる。したがって、傾斜部5は、摺動本体部6と接する位置での錫濃度に対する、接合面7近傍の錫濃度の比率が0.1〜0.8となることが好ましく、0.2〜0.6がより好ましい。本明細書では、傾斜部5の錫濃度のこの比率を「錫濃度の比率」または「錫濃度比」と称する。
Sn:2.0〜15.0質量%
Snは、銅合金のCuマトリックスを固溶強化する作用、または金属間化合物を形成して銅合金の強度を向上させる作用があり、耐摩耗性を向上させる。それだけでなく、Snは耐食性及び摺動特性も向上させる。この効果は、Sn2.0質量%未満では不十分である。Snが15.0質量%を超えると、銅合金が硬くなりすぎて摺動特性が劣化すると共に、合金が脆くなり靭性が損なわれる。したがって、Sn成分は2.0〜15.0質量%とする。
Biは、銅合金マトリックス中に分散した軟質なBi相を形成し、耐摩耗性、非焼付性の向上に寄与する。しかし、Bi自身の強度が小さいことからBiが30.0質量%を越えると銅合金の強度が低下する傾向がある。更に好ましくは、Bi成分は8.0〜25.0質量%である。
これらの元素は、銅合金のCuマトリックスを固溶強化する作用、または金属間化合物を形成して銅合金の強度を向上させる作用がある。したがって、これらの元素を5.0質量%以下含有であれば摺動材料の強度の向上に寄与できる。しかし、これらの元素の含有量が多いと金属間化合物量が多くなって銅合金の靱性が低下する傾向があるため、最大5.0質量%が好ましい。より好ましくは0.1質量%以上1.1質量%以下である。
まず、基材2を準備する。基材2は上記に説明した材質の平板、または円筒体とできるが、あるいはその他の形状でもよい。
上記に説明した組成の銅合金を溶解して、溶融した銅合金を基材2の接合表面上に鋳込む。この際、酸化を防ぐために、不活性ガスや還元性の雰囲気とする、あるいはフラックスを用いることが好ましい。
基材は、銅合金層3を接合させるべき基材表面(接合表面)の反対側表面から、冷却剤により基材2を冷却する。冷却剤は、例えば水または油とすることができ、水または油を基材2の接合表面の反対側表面に衝突させることにより冷却する。
このようにして銅合金の鋳込み、冷却を行なうことにより、銅合金は、基材2の接合表面に接触した銅合金から優先的に一方向凝固される。本実施形態では、銅合金の自由表面側(銅合金層の接合表面とは反対側に相当する)からは冷却を行なわない。
また、鋳造法は全体を溶融させてマトリクスを形成できるために、鋳造法によって銅合金をライニングすることで、焼結法による粉末合金同士の結合よりも銅合金層として十分な合金強度を確保できる。
別の具体例として、遠心鋳造を採用することもできる。もちろん、本発明はこれらの鋳造方法に限定されるものではない。
基材の準備
基材としてSPCC製の鋼板を用い、湯漏れ防止のために周辺部を残し上面中央部を切削して、周辺部に堰を形成した箱形状に加工した。鋳込み厚さの設定は5mmであった。摺動材料の基材となる部分の肉厚は6mmである。酸化防止剤として、溶融硼砂によって基材表面を覆い、H2ガスを含む還元ガス雰囲気中にて1000℃〜1200℃で基材の予熱を行なった。
銅合金として、表1および表2に示す実施例1〜21および比較例1〜5の各組成となるように、純銅、純錫及びその他の成分の材料を配合し、大気中で溶解した。銅合金の溶湯は1100℃〜1200℃で大気中で保持し、予熱された基材上に注湯した。
注湯後、基材下部に設置された散水ノズルから基材底面に向かって冷却水を衝突させた。比較例については、少量の一定流量で連続的に冷却水を衝突させた(冷却水流量40L/minで180秒間冷却)。他方、実施例1〜7および13〜21については、図3に示すように、冷却初期(1段階)に冷却水量を比較例よりも多くして冷却時間を短くし(冷却水流量85L/minで30秒間)、冷却初期の後(2段階目)は1段階目よりも冷却水量を少なくして冷却時間長くし(冷却水流量20L/minで60秒間)、意図的に不連続的な2段階の冷却条件を適用した。2段階の冷却工程終了後は、大気中で放冷して、室温まで徐冷した。実施例8〜12は、実施例1〜7および13〜21よりも第1段階の冷却水量を増大させて(冷却水流量130L/minで20秒間)冷却効果を大きくした。2段階目以降は実施例1〜7および13〜21と同じ条件である。
EPMA装置(型式:日本電子株式会社(JEOL)製JXA−8530F FIELD EMISSION ELECTRON PROBE MICROANALYZER)により、各試料の断面を縦85μm、横116μmの視野を観察し、接合面が横方向になるように撮影した。EPMA装置のEDSにより線分析を行い、接合面近傍の錫濃度分布を測定した。そして、線分析によって得られた、錫元素の強度比を錫濃度比として評価した。断面組織写真は1試料当たり10か所以上撮影した。
銅合金層と基材の接合強度は、銅合金の引張強さに対する銅合金層と基材の剪断強さの比率(剪断強さ/引張強さ)により評価した。剪断強さは、引張強さの影響を受けるため、成分が違う材料を比較できるように、剪断強さ/引張強さの比により接合強度の指標とした。
剪断強さは、図5に示すように銅合金層と基材とが所定の接合面積で接合している試験片に加工して、両端に引張荷重(引張力)を印加していったときに、接合部が破壊する最高引張り応力で示したものである(特開2002−224852号公報参照)。
実施例1〜7の冷却条件では、Sn含有量に関わらず錫濃度比はほぼ一定であったが、実施例8〜12の冷却条件ではSn含有量が増えると錫濃度比は減少する傾向がみられた。
錫濃度比が0.8以下の実施例1〜12の剪断強度は、剪断強さ/引張強さが0.76以上となり、比較例1〜5の値を大きく上回った。錫濃度比に対する剪断強さ/引張強さの関係を図6に示す。錫濃度比の値は、剪断強さ/引張強さの値と大きく相関することがわかる。とりわけ錫濃度比が0.6以下となると(実施例8〜12)、特に剪断強さ/引張強さが約0.88以上となり優れた接合強度が得られた。
表3に、試験結果を示す。表3から、上記添加成分を添加しても、錫濃度比は0.64%〜0.79%の範囲にあり、実施例5の錫濃度比0.72と同等の値であった。そのため、接合強度(剪断強さ/引張強さ)は、0.76〜0.87であり、実施例5の0.86と同程度となった。この結果から添加成分が及ぼす錫濃度比および接合強度への影響は小さいことがわかる。
2 基材
3 銅合金層
5 傾斜部
6 摺動本体部
7 接合面
8 摺動面
11 シール部材
12 回転装置
13 ゲート
Claims (11)
- 基材と、該基材に接合された銅合金層とを有する摺動材料であって、
前記銅合金層は、
Snを2.0〜15.0質量%、
Biを0〜30.0質量%、
Al、Zn、Mn、Si、Ni、Fe、P、Zr、Ti、Mgのうちから選ばれる1種または2種以上を総量で5.0質量%以下
を含み、残部が銅および不可避不純物である銅合金からなり、該銅合金層は、摺動面を含む摺動本体部と、基材との接合面を含む傾斜部を有し、
前記傾斜部の錫濃度は、前記摺動本体部側から前記基材との接合面に向かって小さくなっており、前記傾斜部内の錫濃度の比率は、質量%比で0.1〜0.8、前記傾斜部の厚さが4〜57μmであり、
剪断強さ/引張強さの値が0.76以上である摺動材料。 - 前記比率が、0.2〜0.6である、請求項1に記載された摺動材料。
- 前記銅合金が、MoS2、グラファイトのいずれか又は両方を総量で10.0体積%以下さらに含む、請求項1または請求項2に記載された摺動材料。
- 前記銅合金層上にオーバーレイをさらに有する、請求項1から請求項3までのいずれか1項に記載された摺動材料。
- 前記基材の厚さが1.0〜25.0mmであり、前記銅合金層の厚さが0.1〜3.0mmである、請求項1から請求項4までのいずれか1項に記載された摺動材料。
- 前記傾斜部の厚さが、10〜50μmである、請求項1から請求項5までのいずれか1項に記載された摺動材料。
- 請求項1から請求項6までのいずれか1項に記載された摺動材料を製造する方法であって、
前記基材を準備するステップ、
前記銅合金を溶融するステップ、
溶融した前記銅合金を前記基材の接合すべき表面上に鋳込むステップ、及び
前記基材の接合すべき表面の反対側面から冷却剤により前記基材を冷却して、前記銅合金を一方向凝固させるステップ、
前記鋳込みから所定時間後に、前記冷却剤の供給量を減少させるステップ
を含む、摺動材料を製造する方法。 - 前記冷却剤が、水または油である、請求項7に記載された摺動材料を製造する方法。
- 前記基材を準備するステップが、1つ又は複数の基材から円筒形状体を成形するステップを含み、
前記鋳込むステップが、前記円筒形状体を、円筒形状の中心軸線の周りに回転させながら鋳込むステップを含む、請求項7または請求項8に記載された摺動材料を製造する方法。 - 請求項1から請求項6までのいずれか1項に記載された摺動材料を含む摺動部材。
- 請求項10に記載された摺動部材と軸とを有する軸受装置。
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