JPWO2014119720A1 - 耐摩耗性に優れた内燃機関用バルブシートおよびその製造方法 - Google Patents
耐摩耗性に優れた内燃機関用バルブシートおよびその製造方法 Download PDFInfo
- Publication number
- JPWO2014119720A1 JPWO2014119720A1 JP2014559770A JP2014559770A JPWO2014119720A1 JP WO2014119720 A1 JPWO2014119720 A1 JP WO2014119720A1 JP 2014559770 A JP2014559770 A JP 2014559770A JP 2014559770 A JP2014559770 A JP 2014559770A JP WO2014119720 A1 JPWO2014119720 A1 JP WO2014119720A1
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- Prior art keywords
- powder
- valve seat
- surface side
- internal combustion
- layer
- 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.)
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 43
- 238000004519 manufacturing process Methods 0.000 title claims description 23
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- 239000002245 particle Substances 0.000 claims abstract description 182
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 144
- 229910052742 iron Inorganic materials 0.000 claims abstract description 53
- 239000011812 mixed powder Substances 0.000 claims abstract description 45
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- 239000000314 lubricant Substances 0.000 claims abstract description 33
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- 239000007787 solid Substances 0.000 claims abstract description 30
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 24
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- 239000011159 matrix material Substances 0.000 claims abstract description 19
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 17
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 17
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- -1 C: 0.5 to 1.5% Substances 0.000 description 2
- 229910004261 CaF 2 Inorganic materials 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 229910001567 cementite Inorganic materials 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
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- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 2
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- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 229910017061 Fe Co Inorganic materials 0.000 description 1
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- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 1
Classifications
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- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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- F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
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Abstract
Description
また、特許文献4に記載された技術では、更なる耐摩耗性の向上のために、微細な硬質粒子を多量に含有すると、硬質粒子が凝集して、均一に分散しにくくなり、しかも凝集した硬質粒子が摩耗の起点になるという問題があった。
そして、微細な硬質粒子を分散させて更なる耐摩耗性の向上を図ろうとして、微細な硬質粒子粉末を多量に配合すると、硬質粒子同士が凝集しやすくなり、かえって硬質粒子の分散が粗くなる場合があることを見出した。これは、純鉄粉や合金鋼粉などの基地形成のための鉄系粉末を、硬質粒子粉末に比べて粒径が大きい粗い粉末で構成した場合に顕著になることを知見した。
鉄系粉末と、硬質粒子粉末と、黒鉛粉末と、合金元素粉末と、固体潤滑剤粉末を原料粉として、原料粉の種類を種々変化させて配合し、V型混合機で混練して混合粉A,Cとした。これらの混合粉を金型に装入しメカニカルプレス機で圧縮成形して、圧粉密度:7.0g/cm3の1層のバルブシート形状の圧粉体とし、この圧粉体に仮焼結処理を施し、さらに加圧成形したのち、還元雰囲気中で焼結温度:1150℃で焼結処理を施す、2P2S工程を施し、鉄基焼結体とした。なお、混合粉には、潤滑剤粒子粉末として、鉄系粉末と合金元素粉末と黒鉛粉末と硬質粒子粉末と固体潤滑剤粉末との合計量を100質量部として、ステアリン酸亜鉛を1.0質量部配合した。
試験時間:6h
カム回転数:3000rpm
バルブ回転数:20rpm
スプリング荷重:2940kgf(300N)(セット時)
バルブ材:T400肉盛材
リフト量:9mm
なお、LPG+Air量、冷却水量は一定とした。
得られた結果から、混合粉Aを用いた鉄基焼結体(基準材)を基準(1.00)にして、耐摩耗性および圧環強度を比較し、表1に示す。
ついで、得られた鉄基焼結体から組織観察用試験片を採取し、断面を研磨し腐食(腐食液:マーブル液)して、光学顕微鏡で組織を観察した。その一例を混合粉Aを用いた鉄基焼結体および混合粉Cを用いた鉄基焼結体について、模式図とともに図1に示す。図1から、混合粉Aを使用した鉄基焼結体では、硬質粒子が凝集して粗大な硬質粒子相を形成している。これに対し、混合粉Cを使用した鉄基焼結体では、硬質粒子の凝集は認められず、硬質粒子相は基地中に比較的均一に分散している。
(1)1層または一体化した2層からなる鉄基焼結体製内燃機関用バルブシートであって、前記バルブシートの少なくともバルブ当たり面側の層が、質量%で、C:0.3〜2.0%を含み、Co、Si、Ni、Mo、Cr、Mn、S、W、Vのうちから選ばれた1種または2種以上を合計で70%以下含有し、残部Feおよび不可避的不純物からなる基地部組成と、硬質粒子を前記バルブ当たり面側の層全量に対する質量%で10〜65%含み、かつ該硬質粒子を1000個/mm2以上分散させてなる基地部組織とを有することを特徴とする耐摩耗性に優れた内燃機関用バルブシート。
(2)(1)において、前記硬質粒子が、ビッカース硬さHV0.1で500〜1200HVであるCo基金属間化合物粒子またはFe基金属間化合物粒子であることを特徴とする内燃機関用バルブシート。
(3)(2)において、前記Co基金属間化合物粒子が、Mo−Fe−Cr−Si系Co基金属間化合物粒子であることを特徴とする内燃機関用バルブシート。
(4)(1)ないし(3)のいずれかにおいて、固体潤滑剤粒子を、前記基地部組織中に、前記バルブ当たり面側の層全量に対する質量%で0.5〜2.0%含有することを特徴とする内燃機関用バルブシート。
(5)(1)ないし(4)のいずれかにおいて、前記バルブ当たり面側の層と一体化された着座面側の層が、質量%で、C:0.3〜2.0%を含み、残部Feおよび不可避的不純物からなる基地部組成または、質量%でC:0.3〜2.0%を含み、Mo、Si、Ni、Cr、Mn、S、W、Vのうちから選ばれた1種または2種以上を合計で10%以下含有し、残部Feおよび不可避的不純物からなる基地部組成を有することを特徴とする内燃機関用バルブシート。
(6)(5)において、固体潤滑剤粒子を、前記着座面側の層の基地相中に、前記着座面側の層全量に対する質量%で0.5〜2.0%含むことを特徴とする内燃機関用バルブシート。
(7)原料粉末として、鉄系粉末と硬質粒子粉末と黒鉛粉末と、あるいはさらに合金元素粉末と、あるいはさらに固体潤滑剤粒子粉末とを配合し混合して混合粉とし、該混合粉を金型に挿入し圧縮成形して所定形状、密度の圧粉体とし、該圧粉体を焼結して、1層または一体化した2層からなる鉄基焼結体製バルブシートとする、内燃機関用バルブシートの製造方法であって、前記バルブシートの少なくともバルブ当たり面側の層形成用として、前記原料粉末を、焼結後の基地部組成が、質量%で、C:0.3〜2.0%を含み、Co、Si、Ni、Mo、Cr、Mn、S、W、Vのうちから選ばれた1種または2種以上を合計で70%以下含有し、残部Feおよび不可避的不純物からなる組成となるように配合し、かつ焼結後の基地部の組織が、前記硬質粒子を前記バルブ当たり面側の層全量に対する質量%で10〜65%含み、かつ該硬質粒子を1000個/mm2以上分散させてなる組織となるように、硬質粒子粉末の一部または全部を、平均粒径で15〜50μmの粉末とし、かつ前記鉄系粉末を平均粒径が15〜50μmの粉末として配合する、ことを特徴とする耐摩耗性に優れた内燃機関用バルブシートの製造方法。
(8)(7)において、前記硬質粒子粉末が、ビッカース硬さHV0.1で500〜1200HVであるCo基金属間化合物粉末またはFe基金属間化合物粉末であることを特徴とする内燃機関用バルブシートの製造方法。
(9)(8)において、前記Co基金属間化合物粉末が、Mo−Fe−Cr−Si系Co基金属間化合物粉末であることを特徴とする内燃機関用バルブシートの製造方法。
(10)(7)ないし(9)のいずれかにおいて、前記固体潤滑剤粒子粉末を、焼結後の前記バルブ当たり面側の層の基地相中に、前記バルブ当たり面側の層全量に対する質量%で0.5〜2.0%となるように混合することを特徴とする内燃機関用バルブシートの製造方法。
(11)(7)ないし(10)のいずれかにおいて、前記焼結後、さらに成形と焼結とを少なくとも1回以上繰返すことを特徴とする内燃機関用バルブシートの製造方法。
(12)(7)ないし(11)のいずれかにおいて、前記バルブシートが前記バルブ当たり面側の層と一体化された着座面側の層を有し、該着座面側の層形成用として、前記混合粉を、前記原料粉末として鉄系粉末と黒鉛粉末と、あるいはさらに合金元素粉末と、あるいはさらに固体潤滑剤粒子粉末とを、焼結後の着座面側の層の基地部組成が、質量%で、C:0.3〜2.0%を含み、残部Feおよび不可避的不純物からなる組成、または質量%で、C:0.3〜2.0%を含み、Mo、Si、Ni、Cr、Mn、S、W、Vのうちから選ばれた1種または2種以上を合計で10%以下含有し、残部Feおよび不可避的不純物からなる組成、となるように配合し、かつ前記鉄系粉末を平均粒径が60〜80μmの粉末として配合した混合粉とすることを特徴とする内燃機関用バルブシートの製造方法。
(13)(12)において、前記固体潤滑剤粒子粉末を、焼結後の前記着座面側の層の基地中に、前記着座面側の層全量に対する質量%で0.5〜2.0%となるように混合することを特徴とする内燃機関用バルブシートの製造方法。
(14)(7)ないし(13)のいずれかに記載の内燃機関用バルブシートの製造方法により製造されてなることを特徴とする内燃機関用バルブシート。
本発明におけるバルブシートのバルブ当り面側層は、基地相中に硬質粒子が分散した基地部を有する、鉄系焼結合金製とする。基地相中に硬質粒子を分散させることにより、バルブシートの耐摩耗性が顕著に向上する。このため、配合する硬質粒子粉末は、ビッカース硬さHV0.1で500〜1200HVの粉末とすることが好ましい。このような粉末としては、Co基金属間化合物粉末またはFe基金属間化合物粉末、あるいはFe-Mo系硬質粒子粉末が例示できる。なかでも、Co基金属間化合物粒子は、比較的軟らかなCo基地中に硬さの高い金属間化合物が分散した粒子であり、相手攻撃性が低いという特徴があり好ましい。また、Co基金属間化合物粉末は、Si−Cr−Mo系Co基金属間化合物、Si−Ni−Cr−Mo系Co基金属間化合物、Mo−Fe−Cr−Si系Co基金属間化合物粉末が、また、Fe基金属間化合物粉末は、Co−Ni−Cr−Mo系Fe基金属間化合物が、それぞれ例示できる。なお、Co基金属間化合物粒子、Fe基金属間化合物粒子の硬さは500〜1200HV0.1であることが好ましい。
Co基金属間化合物粒子の中では、Mo−Fe−Cr−Si系Co基金属間化合物粒子が、硬質粒子としてとくに耐摩耗性を向上する作用が顕著である。Mo−Fe−Cr−Si系Co基金属間化合物粒子は質量%で、Mo:35〜47%、Fe:3〜15%、Cr:3〜10%、Si:2〜5%、残部Coおよび不可避的不純物からなる組成とすることが好ましい。
硬質粒子の分散量が、10%未満では、所望の耐摩耗性が確保できない。一方、65%を超える分散は、効果が飽和し、添加量に見合う効果が期待できなくなる。このため、バルブ当り面側層における硬質粒子の分散量をバルブ当り面側層全量に対する質量%で、10〜65%の範囲に限定した。なお、より好ましくは30〜40%である。
C:0.3〜2.0%
Cは、焼結体の強度、硬さを増加させ、焼結時に金属原子の拡散を容易にする元素であり、本発明では、0.3%以上含有させることが好ましい。一方、2.0%を超える含有は、基地中にセメンタイトが生成しやすくなるとともに、焼結時に液相が発生しやすく、寸法精度が低下するという問題がある。このため、Cは0.3〜2.0%の範囲に限定した。なお、好ましくは0.9〜1.1%である。
Co、Si、Ni、Mo、Cr、Mn、S、W、Vはいずれも、焼結体の強度、硬さを増加させ、さらには耐摩耗性を向上させる元素であり、このような効果を得るためには、硬質粒子起因を含め、少なくとも1種を選択し合計で25%以上含有することが望ましい。一方、これらの元素の含有量が合計で70%を超えると、成形性が低下し、強度も低下する。このため、Co、Si、Ni、Mo、Cr、Mn、S、W、Vのうちから選ばれた1種または2種以上を合計で、70%以下に限定した。なお、好ましくは合計で60%以下、さらに好ましくは40%以下である。
また、混合粉に原料粉末として配合される硬質粒子粉末は、焼結体中で基地相中に分散し耐摩耗性向上に寄与する。配合する硬質粒子粉末を微細な粉末とするほど、基地中に微細に分散する傾向があり、耐摩耗性の向上のためには、できるだけ微細な粉末を使用することが好ましい。このため、本発明では、硬質粒子粉末は、製造性、とくに流動性の観点から、微細な硬質粒子粉末である、平均粒径が15〜50μm(−#350程度)の粉末とした。なお、粉末の平均粒径測定は、例えば、レーザー回析法を用いて得られた値を用いるものとする。
硬質粒子粉末、固体潤滑剤粉末、鉄系粉末以外に、混合粉に配合される粉末、例えばNi粉、Co粉、黒鉛粉等の合金元素粉末も、硬質粒子を微細に分散させるという観点から、平均粒径が15〜50μmを有する粉末とすることが好ましい。上記した平均粒径を超えて大きな粉末では、硬質粒子を微細に分散させることができなくなる。
なお、着座面側層の焼結後の基地相組成(なお、固体潤滑剤粒子が分散している場合にはそれを含む基地部組成)の限定理由はつぎのとおりである。
Cは、焼結体の強度、硬さを増加させる元素であり、本発明では、バルブシートとして所望の強度、硬さを確保するために、着座面側層では0.3%以上含有することが望ましいが、2.0%を超える含有は、基地中にセメンタイトが生成しやすくなるとともに、焼結時に液相が発生しやすく、寸法精度が低下するという問題がある。このため、Cは0.3〜2.0%の範囲に限定することが好ましい。なお、より好ましくは0.9〜1.1%である。
Mo、Si、Ni、Cr、Mn、S、W、Vのうちから選ばれた1種または2種以上:合計で10%以下
Mo、Si、Ni、Cr、Mn、S、W、Vはいずれも、着座面側層の強度、硬さを増加させる元素であり、必要に応じて選択して1種または2種以上を含有できる。このような効果を得るためには、合計で1%以上含有することが望ましいが、これら元素の含有量が合計で10%を超えて含有しても効果が飽和し含有量に見合う効果が期待できなくなり経済的に不利となる。このため、含有する場合には合計で10%以下に限定することが好ましい。なお、より好ましくは5〜6%である。
なお、上記した以外の着座面側層の残部は、Feおよび不可避的不純物からなる。
本発明では、ダイ、コアロッド、上パンチ、下パンチと、互いに独立して駆動可能な2種のフィーダーとを有するプレス成形機を用いることが好ましい。以下、バルブ当り面側層と着座面側層との2層からなるバルブシートを例にして説明する。
そして、得られた圧粉体に、ついで焼結処理を施して上下2層構造の焼結体とする。焼結処理の条件としては、還元雰囲気中で行なうこと以外は、所望の特性に応じて適宜、決定すればよく、とくに限定する必要はない。なお、焼結温度は、1100〜1200℃とすることが焼結拡散の観点から好ましい。
以下、実施例に基づいて、さらに本発明について説明する。
これら混合粉を、ダイ、コアロッド、上パンチ、下パンチと、互いに独立して駆動可能な2種のフィーダーと、を有するプレス成形機を用いて、上下2層の圧粉体とした。
得られた焼結体の各層から分析用試料を採取し、発光分析により各元素の含有量を求めた。測定は、2層の境界面より内側の断面とした。
また、得られたバルブシート(焼結体)を、図2に示す単体リグ摩耗試験機に装入し、下記の試験条件
試験温度:300℃(シート面)
試験時間:6hr
カム回転数:3000rpm
バルブ回転数:20rpm
スプリング荷重:2940kgf(300N)(セット時)
リフト量:9mm
バルブ材質:T400肉盛材
なお、LPG+Air量、冷却水量は一定とした。
で運転し、試験後の試験片(バルブシート)の凹み深さを測定し、摩耗量(μm)を算出した。焼結体No.1の摩耗量を基準(1.00)として、当該焼結体の摩耗量比を算出した。基準より摩耗量が少ない場合を○、それ以外を×として耐摩耗性を評価した。
2 セティングプレート
3 熱源(LPG+Air)
4 バルブ
Claims (14)
- 1層または一体化した2層からなる鉄基焼結体製内燃機関用バルブシートであって、前記バルブシートの少なくともバルブ当たり面側の層が、質量%で、C:0.3〜2.0%を含み、Co、Si、Ni、Mo、Cr、Mn、S、W、Vのうちから選ばれた1種または2種以上を合計で70%以下含有し、残部Feおよび不可避的不純物からなる基地部組成と、硬質粒子を前記バルブ当たり面側の層全量に対する質量%で10〜65%含み、かつ該硬質粒子を1000個/mm2以上分散させてなる基地部組織とを有することを特徴とする耐摩耗性に優れた内燃機関用バルブシート。
- 前記硬質粒子が、ビッカース硬さHV0.1で500〜1200HVであるCo基金属間化合物粒子またはFe基金属間化合物粒子であることを特徴とする請求項1に記載の内燃機関用バルブシート。
- 前記Co基金属間化合物粒子が、Mo−Fe−Cr−Si系Co基金属間化合物粒子であることを特徴とする請求項2に記載の内燃機関用バルブシート。
- 固体潤滑剤粒子を、前記基地部組織中に、前記バルブ当たり面側の層全量に対する質量%で0.5〜2.0%含有することを特徴とする請求項1ないし3のいずれかに記載の内燃機関用バルブシート。
- 前記バルブ当たり面側の層と一体化された着座面側の層が、質量%で、C:0.3〜2.0%を含み、残部Feおよび不可避的不純物からなる基地部組成または、質量%でC:0.3〜2.0%を含み、Mo、Si、Ni、Cr、Mn、S、W、Vのうちから選ばれた1種または2種以上を合計で10%以下含有し、残部Feおよび不可避的不純物からなる基地部組成を有することを特徴とする請求項1ないし4のいずれかに記載の内燃機関用バルブシート。
- 固体潤滑剤粒子を、前記着座面側の層の基地相中に、前記着座面側の層全量に対する質量%で0.5〜2.0%含むことを特徴とする請求項5に記載の内燃機関用バルブシート。
- 原料粉末として、鉄系粉末と硬質粒子粉末と黒鉛粉末と、あるいはさらに合金元素粉末と、あるいはさらに固体潤滑剤粒子粉末とを配合し混合して混合粉とし、該混合粉を金型に挿入し圧縮成形して所定形状、密度の圧粉体とし、該圧粉体を焼結して、1層または一体化した2層からなる鉄基焼結体製バルブシートとする、内燃機関用バルブシートの製造方法であって、前記バルブシートの少なくともバルブ当たり面側の層形成用として、前記原料粉末を、焼結後の基地部組成が、質量%で、C:0.3〜2.0%を含み、Co、Si、Ni、Mo、Cr、Mn、S、W、Vのうちから選ばれた1種または2種以上を合計で70%以下含有し、残部Feおよび不可避的不純物からなる組成となるように配合し、かつ焼結後の基地部の組織が、硬質粒子を前記バルブ当たり面側の層全量に対する質量%で10〜65%含み、かつ該硬質粒子を1000個/mm2以上分散させてなる組織となるように、硬質粒子粉末の一部または全部を、平均粒径で15〜50μmの粉末とし、かつ前記鉄系粉末を平均粒径が15〜50μmの粉末として配合する、ことを特徴とする耐摩耗性に優れた内燃機関用バルブシートの製造方法。
- 前記硬質粒子粉末が、ビッカース硬さHV0.1で500〜1200HVであるCo基金属間化合物粉末またはFe基金属間化合物粉末であることを特徴とする請求項7に記載の内燃機関用バルブシートの製造方法。
- 前記Co基金属間化合物粉末が、Mo−Fe−Cr−Si系Co基金属間化合物粉末であることを特徴とする請求項8に記載の内燃機関用バルブシートの製造方法。
- 前記固体潤滑剤粒子粉末を、焼結後の前記バルブ当たり面側の層の基地相中に、前記バルブ当たり面側の層全量に対する質量%で0.5〜2.0%となるように混合することを特徴とする請求項7ないし9のいずれかに記載の内燃機関用バルブシートの製造方法。
- 前記焼結後、さらに成形と焼結とを少なくとも1回以上繰返すことを特徴とする請求項7ないし10のいずれかに記載の内燃機関用バルブシートの製造方法。
- 前記バルブシートが前記バルブ当たり面側の層と一体化された着座面側の層を有し、該着座面側の層形成用として、前記混合粉を、前記原料粉末として鉄系粉末と黒鉛粉末と、あるいはさらに合金元素粉末と、あるいはさらに固体潤滑剤粒子粉末とを、焼結後の着座面側の層の基地部組成が、質量%で、C:0.3〜2.0%を含み、残部Feおよび不可避的不純物からなる組成、または質量%で、C:0.3〜2.0%を含み、Mo、Si、Ni、Cr、Mn、S、W、Vのうちから選ばれた1種または2種以上を合計で10%以下含有し、残部Feおよび不可避的不純物からなる組成、となるように配合し、かつ前記鉄系粉末を平均粒径が60〜80μmの粉末として配合した混合粉とすることを特徴とする請求項7ないし11のいずれかに記載の内燃機関用バルブシートの製造方法。
- 前記固体潤滑剤粒子粉末を、焼結後の前記着座面側の層の基地相中に、前記着座面側の層全量に対する質量%で0.5〜2.0%となるように混合することを特徴とする請求項12に記載の内燃機関用バルブシートの製造方法。
- 請求項7ないし13のいずれかに記載の内燃機関用バルブシートの製造方法により製造されてなることを特徴とする内燃機関用バルブシート。
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CN112301255B (zh) * | 2020-10-27 | 2021-07-30 | 上海交通大学 | 一种模具用高导热高强Co-Fe-Ni合金及其增材制造方法 |
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JP3926320B2 (ja) * | 2003-01-10 | 2007-06-06 | 日本ピストンリング株式会社 | 鉄基焼結合金製バルブシートおよびその製造方法 |
JP4716366B2 (ja) | 2005-10-24 | 2011-07-06 | 日立粉末冶金株式会社 | 焼結バルブシートの製造方法 |
JP4582587B2 (ja) | 2005-10-12 | 2010-11-17 | 日立粉末冶金株式会社 | 耐摩耗性焼結部材の製造方法 |
US7757396B2 (en) | 2006-07-27 | 2010-07-20 | Sanyo Special Steel Co., Ltd. | Raw material powder for laser clad valve seat and valve seat using the same |
CN102046824B (zh) | 2008-03-31 | 2014-06-04 | 日本活塞环株式会社 | 阀座用铁基烧结合金以及内燃机用阀座 |
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- 2014-01-31 US US14/764,299 patent/US10428700B2/en active Active
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JPH05202451A (ja) * | 1992-01-28 | 1993-08-10 | Teikoku Piston Ring Co Ltd | バルブシート用焼結合金 |
JP2005248234A (ja) * | 2004-03-03 | 2005-09-15 | Nippon Piston Ring Co Ltd | バルブシート用鉄基焼結合金材 |
JP2008030071A (ja) * | 2006-07-27 | 2008-02-14 | Sanyo Special Steel Co Ltd | レーザー肉盛バルブシート用原料粉末およびこれを用いたバルブシート |
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US20150369090A1 (en) | 2015-12-24 |
JP6290107B2 (ja) | 2018-03-07 |
BR112015018090A2 (pt) | 2017-07-18 |
US10428700B2 (en) | 2019-10-01 |
WO2014119720A1 (ja) | 2014-08-07 |
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