JPH06299284A - High strength nitrided sintered member excellent in wear resistance and its production - Google Patents
High strength nitrided sintered member excellent in wear resistance and its productionInfo
- Publication number
- JPH06299284A JPH06299284A JP5084792A JP8479293A JPH06299284A JP H06299284 A JPH06299284 A JP H06299284A JP 5084792 A JP5084792 A JP 5084792A JP 8479293 A JP8479293 A JP 8479293A JP H06299284 A JPH06299284 A JP H06299284A
- Authority
- JP
- Japan
- Prior art keywords
- less
- weight
- sintered
- wear resistance
- strength
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、耐摩耗性に優れた高強
度窒化焼結部材およびその製造方法に係わり、特に高強
度でかつ耐摩耗性に優れていることが要求される部材、
例えば、自動車エンジンのバルブシートや各種の摺動部
材の素材として利用するのに好適な耐摩耗性に優れた高
強度窒化焼結部材およびその製造方法に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-strength nitrided sintered member having excellent wear resistance and a method for manufacturing the same, and particularly to a member required to have high strength and excellent wear resistance,
For example, the present invention relates to a high-strength nitriding sintered member having excellent wear resistance, which is suitable for use as a material for a valve seat of an automobile engine and various sliding members, and a manufacturing method thereof.
【０００２】[0002]
【従来の技術】高強度でかつ耐摩耗性に優れていること
が要求される部材のひとつとして、自動車エンジンのバ
ルブシートがある。2. Description of the Related Art A valve seat for an automobile engine is one of the members which are required to have high strength and excellent wear resistance.
【０００３】このバルブシートは、バルブの傘部におけ
るサーフェス部分が密着するように円錐のリング形状に
成形したものであって、シリンダヘッドのうちとくにバ
ルブシート部分の要求特性を満足することができるよう
に、シリンダヘッドとは別部材として円錐のリング形状
に成形してシリンダヘッドに嵌め込むことにより使用さ
れる。This valve seat is formed in a conical ring shape so that the surface portion of the valve head portion is in close contact with the valve seat, and it is possible to satisfy the required characteristics of the valve seat portion of the cylinder head. In addition, it is used as a member separate from the cylinder head by molding it into a conical ring shape and fitting it into the cylinder head.
【０００４】ところで、近年の自動車エンジンの高回転
化や、燃料ガソリンの無鉛化などによって、バルブシー
トに対する要求特性がより一層厳しいものとなってお
り、バルブシートに対する熱的および機械的負荷はより
大きなものとなっている。By the way, due to the recent increase in the engine speed of automobiles and the unleading of fuel gasoline, the required characteristics for the valve seat have become more severe, and the thermal and mechanical load on the valve seat is greater. It has become a thing.
【０００５】したがって、バルブシートの素材として従
来は溶製材が用いられてきたが、近年においては焼結材
が用いられるようになってきている。Therefore, a molten material has been conventionally used as the material for the valve seat, but in recent years, a sintered material has been used.
【０００６】そして、なかには、鉄基焼結合金を用い、
基地を強化したり硬質相として基地中に分散させること
ができるように、Ｃｒ，Ｎｉ，Ｗ，Ｍｏ，Ｃｏ等の元素
を添加したものもあった。And, among others, an iron-based sintered alloy is used,
In some cases, elements such as Cr, Ni, W, Mo and Co were added so that the matrix can be strengthened or dispersed as a hard phase in the matrix.
【０００７】[0007]
【発明が解決しようとする課題】一方、自動車エンジン
の高回転化，ターボチャージャによる高出力化などのエ
ンジンの出力増大の傾向はさらに強まっており、従来以
上に強度および耐摩耗性に優れたバルブシート素材の開
発が望まれていた。On the other hand, there is an increasing tendency for engine output to increase, such as higher engine speeds of automobiles and higher output by turbochargers, and valves having higher strength and wear resistance than before. Development of seat material was desired.
【０００８】また、その他の各種摺動部材においても、
依然として強度および耐摩耗性を向上させることが望ま
れていた。Also, in other various sliding members,
It was still desired to improve strength and abrasion resistance.
【０００９】したがって、強度および耐摩耗性がさらに
改善された材料の開発が望まれているという課題があっ
た。Therefore, there has been a problem that it is desired to develop a material having further improved strength and wear resistance.
【００１０】[0010]
【発明の目的】本発明は、上述した従来の課題にかんが
みてなされたものであって、強度および耐摩耗性により
一層優れている焼結部材を提供することを目的としてい
る。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a sintered member which is further excellent in strength and wear resistance.
【００１１】[0011]
【課題を解決するための手段】本発明に係わる耐摩耗性
に優れた高強度窒化焼結部材は、Ｃｒ：６重量％以上３
０重量％以下、Ｍｏ：５重量％以下、残部実質的にＦｅ
よりなる合金マトリックス中に、ＦｅＭｏ，ＦｅＷ，Ｆ
ｅＣｒのうちから選ばれる１種または２種以上の硬質粒
子が２０重量％以下、ＣａＦ２，ＢａＦ２，ＢＮ，Ｍｏ
Ｓ２，ＷＳ２のうちから選ばれる１種または２種以上の
潤滑成分が２重量％以下の範囲で分散し、少なくとも表
面より０．５ｍｍ以上の深さまで窒化焼結している構成
としたことを特徴としており、場合によっては、前記合
金マトリックス中に、Ｓｉ：２重量％以下、Ｎｉ：５重
量％以下、Ｃ：３重量％以下のうちの１種または２種以
上を含んでいる構成としたことを特徴としており、この
ような耐摩耗性に優れた高強度窒化焼結部材に係わる発
明の構成をもって前述した従来の課題を解決するための
手段としている。A high-strength nitriding and sintering member having excellent wear resistance according to the present invention comprises Cr: 6% by weight or more and 3% or more.
0 wt% or less, Mo: 5 wt% or less, balance substantially Fe
FeMo, FeW, F in an alloy matrix consisting of
20% by weight or less of one or more kinds of hard particles selected from eCr, CaF 2 , BaF 2 , BN, Mo
One or two or more kinds of lubricating components selected from S 2 and WS 2 are dispersed in a range of 2% by weight or less, and are nitrided and sintered to at least a depth of 0.5 mm or more from the surface. In some cases, the alloy matrix contains one or more of Si: 2 wt% or less, Ni: 5 wt% or less, and C: 3 wt% or less. This is a feature of the present invention, and the structure of the invention relating to such a high-strength nitrided sintered member having excellent wear resistance is a means for solving the above-mentioned conventional problems.
【００１２】また、本発明に係わる耐摩耗性に優れた高
強度窒化焼結部材の製造方法は、Ｃｒ：６重量％以上３
０重量％以下、Ｍｏ：５重量％以下、残部実質的にＦｅ
よりなる鋼合金粉末と、ＦｅＭｏ，ＦｅＷ，ＦｅＣｒの
うちから選ばれる１種または２種以上の硬質粒子を２０
重量％以下と、ＣａＦ２，ＢａＦ２，ＢＮ，ＭｏＳ２，
ＷＳ２のうちから選ばれる１種または２種以上の潤滑成
分を２重量％以下と、その他適宜の助剤成分を混合した
のち成形し、成形体を真空中ないしは略真空中（数１０
Ｔｏｒｒ以下の低圧の窒素ガス中である場合を含む。）
で焼結し、焼結の終了段階でＮ２ガスにより窒化する構
成としたことを特徴としている。The method for producing a high-strength nitrided sintered member having excellent wear resistance according to the present invention is Cr: 6% by weight or more and 3% or more.
0 wt% or less, Mo: 5 wt% or less, balance substantially Fe
Steel alloy powder consisting of 20 and one or more hard particles selected from FeMo, FeW and FeCr.
If the content is less than or equal to wt%, CaF 2 , BaF 2 , BN, MoS 2 ,
Mixing 2% by weight or less of one or more lubricating components selected from WS 2 and other appropriate auxiliary components, and then molding the molded product in a vacuum or a substantially vacuum (several tens).
Including the case of low pressure nitrogen gas below Torr. )
It is characterized in that it is sintered at 1, and is nitrided by N 2 gas at the end stage of sintering.
【００１３】また、同じ目的を達成する本発明に係わる
耐摩耗性に優れた高強度窒化焼結部材の製造方法は、Ｃ
ｒ：６重量％以上３０重量％以下、Ｍｏ：５重量％以
下、残部実質的にＦｅよりなる鋼合金粉末と、ＦｅＭ
ｏ，ＦｅＷ，ＦｅＣｒのうちから選ばれる１種または２
種以上の硬質粒子を２０重量％以下と、ＣａＦ２，Ｂａ
Ｆ２，ＢＮ，ＭｏＳ２，ＷＳ２のうちから選ばれる１種
または２種以上の潤滑成分を２重量％以下と、その他適
宜の助剤成分を混合したのち成形し、成形体をＮ２ガス
中で焼結して少なくとも表面より０．５ｍｍ以上の深さ
まで窒化する構成としたことを特徴としている。A method for producing a high-strength nitrided sintered member excellent in wear resistance according to the present invention, which achieves the same object, is C
r: 6 wt% or more and 30 wt% or less, Mo: 5 wt% or less, the balance being a steel alloy powder consisting essentially of Fe, and FeM
1 or 2 selected from o, FeW and FeCr
20% by weight or less of hard particles of at least one kind, CaF 2 , Ba
F 2, BN, and molded after mixing with one or the two or more 2 wt% lubricant component of the following selected from among MoS 2, WS 2, and other appropriate auxiliary component, the molded body N 2 gas It is characterized in that it is sintered inside and nitrided at least to a depth of 0.5 mm or more from the surface.
【００１４】そして、本発明に係わる耐摩耗性に優れた
高強度窒化焼結部材の製造方法の実施態様においては、
鋼合金粉末中に、Ｓｉ：２重量％以下、Ｎｉ：５重量％
以下、Ｃ：３重量％以下のうちの１種または２種以上を
含むものとした構成としたことを特徴としており、上記
した耐摩耗性に優れた高強度窒化焼結部材の製造方法に
係わる発明の構成をもって前述した従来の課題を解決す
るための手段としている。In an embodiment of the method for producing a high-strength nitrided sintered member having excellent wear resistance according to the present invention,
In steel alloy powder, Si: 2 wt% or less, Ni: 5 wt%
Hereinafter, C: characterized in that it is configured to include one or more of 3% by weight or less, and relates to a method for producing a high-strength nitrided sintered member having excellent wear resistance as described above. The structure of the invention is used as means for solving the above-mentioned conventional problems.
【００１５】本発明に係わる耐摩耗性に優れた高強度窒
化焼結部材は、上記した成分組成を有するものである
が、その理由について以下に説明する。The high-strength nitrided sintered member having excellent wear resistance according to the present invention has the above-mentioned component composition, and the reason will be described below.
【００１６】Ｃｒ：６重量％以上３０重量％以下 Ｃｒは窒化焼結によって多量の窒化物を形成することに
より、焼結部材の耐摩耗性を著しく向上させるのに有効
であるので、このような効果を得ることができるように
６重量％以上とした。しかし、３０重量％を超えて添加
させると成形性が劣り、密度が上昇しないため強度およ
び耐摩耗性が低下することとなるので、Ｃｒは６重量％
以上３０重量％以下とした。Cr: 6% by weight or more and 30% by weight or less Cr is effective for significantly improving the wear resistance of the sintered member by forming a large amount of nitride by nitriding and sintering. The amount is 6% by weight or more so that the effect can be obtained. However, if it is added in an amount of more than 30% by weight, the formability will be poor and the density will not increase so that the strength and wear resistance will decrease, so Cr is 6% by weight.
The amount is 30% by weight or less.
【００１７】Ｍｏ：５重量％以下 ＭｏはＣｒと複炭化物を形成し、また、残留オーステナ
イトを少なくして熱間の強度を増加するのに有効である
が、添加量が多い場合には粉末を硬くして成形性を低下
させるため、５重量％以下とした。Mo: 5 wt% or less Mo forms a double carbide with Cr, and is effective for reducing retained austenite and increasing hot strength. However, when the addition amount is large, powder is added. In order to make it hard and reduce moldability, it was set to 5% by weight or less.
【００１８】Ｓｉ：２重量％以下 Ｓｉは粉末中の含有酸素量を低下させて焼結部材の特性
を向上させるのに有効であるので、場合によっては添加
することも良いが、多すぎると粉末を硬くすると共に球
状化するため成形性を低下させることとなるので、添加
するとしても２重量％以下とするのがよい。Si: 2% by weight or less Si is effective in reducing the oxygen content in the powder and improving the characteristics of the sintered member, so it may be added in some cases, but if too much, the powder Since it hardens and spheroidizes, the moldability is deteriorated. Therefore, even if it is added, the content is preferably 2% by weight or less.
【００１９】Ｎｉ：５重量％以下 Ｎｉは焼結部材の靭性を向上させるのに有効であるの
で、場合によっては添加することも良いが、多すぎると
窒化を減じ残留オーステナイトを増加することとなるの
で、添加するとしても５重量％以下とするのがよい。Ni: 5 wt% or less Ni is effective in improving the toughness of the sintered member, so it may be added in some cases, but if it is too much, nitriding is reduced and retained austenite is increased. Therefore, even if added, it is preferable to make it 5% by weight or less.
【００２０】Ｃ：３重量％以下 Ｃは炭化物を形成して硬さを増加し、焼結部材の耐摩耗
性を向上させ窒化量を増加させるのに有効であるので、
場合によっては添加することも良いが、多すぎると脆く
なって焼結部材の靭性を低下させることとなるので、添
加するとしても３重量％以下とするのがよい。C: 3 wt% or less C is effective in forming carbides to increase hardness, improving wear resistance of the sintered member and increasing nitriding amount.
It may be added in some cases, but if it is too much, it becomes brittle and the toughness of the sintered member is reduced, so even if it is added, it is preferable to be 3% by weight or less.
【００２１】ＦｅＭｏ，ＦｅＷ，ＦｅＣｒのうちから選
ばれる１種または２種以上の硬質粒子：２０重量％以下 ＦｅＭｏ，ＦｅＷ，ＦｅＣｒのうちから選ばれる１種ま
たは２種以上の硬質粒子は、焼結部材中に均一に分散し
てその耐摩耗性を向上させるが、多すぎると焼結部材の
靭性を低下させることとなるので、２０重量％以下の範
囲で分散させる。One or more hard particles selected from FeMo, FeW and FeCr: 20 wt% or less FeMo, FeW and one or more hard particles selected from FeCr are sintered. Although it is evenly dispersed in the member to improve its wear resistance, if it is too large, the toughness of the sintered member is lowered, so it is dispersed in a range of 20% by weight or less.
【００２２】ＣａＦ２，ＢａＦ２，ＢＮ，ＭｏＳ２，Ｗ
Ｓ２のうちから選ばれる１種または２種以上の潤滑成
分：２重量％以下 ＣａＦ２，ＢａＦ２，ＢＮ，ＭｏＳ２，ＷＳ２のうちか
ら選ばれる１種または２種以上の潤滑成分は、焼結部材
中に均一に分散してその摺動特性を向上させ、この結
果、耐摩耗性に優れたものとするので、２重量％以下の
範囲で添加する。CaF 2 , BaF 2 , BN, MoS 2 , W
One or more lubricating components selected from among S 2: 2 wt% or less CaF 2, BaF 2, BN, one or more lubricating components selected from among MoS 2, WS 2 is Since it is uniformly dispersed in the sintered member to improve its sliding characteristics and, as a result, it has excellent wear resistance, it is added in a range of 2% by weight or less.
【００２３】本発明に係わる耐摩耗性に優れた高強度窒
化焼結部材は、上記したＣｒ，Ｍｏ，Ｓｉ，Ｎｉ，Ｃ等
の合金成分およびＦｅＭｏ，ＦｅＷ，ＦｅＣｒ等の硬質
粒子，ＣａＦ２，ＢａＦ２，ＢＮ，ＭｏＳ２，ＷＳ２等
の潤滑成分を含有し、少なくとも表面より０．５ｍｍ以
上の深さまで窒化焼結しているものであるが、この場合
の窒素量は、窒化時における窒素ガス圧力や温度や時間
などによっても異なるが、およそ、１００Ｔｏｒｒで
０．２重量％、６００Ｔｏｒｒで０．６重量％、８００
Ｔｏｒｒで１．０重量％である。The high-strength nitriding and sintering member having excellent wear resistance according to the present invention includes alloy components such as Cr, Mo, Si, Ni and C, hard particles such as FeMo, FeW and FeCr, CaF 2 , It contains a lubricating component such as BaF 2 , BN, MoS 2 and WS 2 and is nitrided and sintered at least to a depth of 0.5 mm or more from the surface. In this case, the amount of nitrogen is nitrogen at the time of nitriding. Depending on the gas pressure, temperature, time, etc., it is approximately 0.2 wt% at 100 Torr, 0.6 wt% at 600 Torr, 800
It is 1.0 wt% in Torr.
【００２４】このような窒化焼結部材を製造するに際し
ては、Ｃｒ：６重量％以上３０重量％以下、Ｍｏ：５重
量％以下、場合によってはＳｉ：２重量％以下、Ｎｉ：
５重量％以下、Ｃ：３重量％以下、残部実質的にＦｅよ
りなる鋼合金粉末と、ＦｅＭｏ，ＦｅＷ，ＦｅＣｒのう
ちから選ばれる１種または２種以上の硬質粒子を２０重
量％以下と、ＣａＦ２，ＢａＦ２，ＢＮ，ＭｏＳ２，Ｗ
Ｓ２のうちから選ばれる１種または２種以上の潤滑成分
を２重量％以下と、必要によっては適宜のバインダー等
の助剤成分とを混合して均一分散させたのち成形し、適
宜の脱ろうを行ったあと、成形体を真空中または略真空
中（例えば、数１０Ｔｏｒｒの窒素ガス中）で焼結し、
焼結の終了段階で、例えば８００℃以上の温度で窒素ガ
スを１００Ｔｏｒｒないしは８００Ｔｏｒｒ程度に加圧
し、５分以上１時間程度までの加熱を行って成形体の少
なくとも表面より０．５ｍｍ以上の深さまで窒化する。In manufacturing such a nitrided sintered member, Cr: 6% by weight or more and 30% by weight or less, Mo: 5% by weight or less, and in some cases Si: 2% by weight or less, Ni:
5% by weight or less, C: 3% by weight or less, the balance being steel alloy powder consisting essentially of Fe, and 20% by weight or less of one or more hard particles selected from FeMo, FeW and FeCr. CaF 2 , BaF 2 , BN, MoS 2 , W
2 % by weight or less of one or more lubricating components selected from S 2 and, if necessary, auxiliary components such as an appropriate binder are mixed and uniformly dispersed, and then molded and appropriately demolded. After brazing, the molded body is sintered in a vacuum or a substantially vacuum (for example, in a nitrogen gas of several tens Torr),
At the end of sintering, for example, nitrogen gas is pressurized at a temperature of 800 ° C. or higher to about 100 Torr or 800 Torr and heated for about 5 minutes to about 1 hour to a depth of at least 0.5 mm from the surface of the compact. Nitriding.
【００２５】窒化後は、そのまま窒素ガス急冷すること
により焼入れまでを一工程で実施することが可能である
が、焼入れは別工程であってもよい。After nitriding, it is possible to perform quenching in one step by quenching nitrogen gas as it is, but quenching may be performed in another step.
【００２６】また、上記窒化焼結部材を製造する他の方
法としては、Ｃｒ：６重量％以上３０重量％以下、Ｍ
ｏ：５重量％以下、場合によってはＳｉ：２重量％以
下、Ｎｉ：５重量％以下、Ｃ：３重量％以下、残部実質
的にＦｅよりなる鋼合金粉末と、ＦｅＭｏ，ＦｅＷ，Ｆ
ｅＣｒのうちから選ばれる１種または２種以上の硬質粒
子を２０重量％以下と、ＣａＦ２，ＢａＦ２，ＢＮ，Ｍ
ｏＳ２，ＷＳ２のうちから選ばれる１種または２種以上
の潤滑成分を２重量％以下と、必要によっては適宜のバ
インダー等の助剤成分とを混合して均一分散させたのち
成形し、適宜の脱ろうを行ったあと、成形体を例えば８
００℃以上の温度でかつ窒素ガスを１００Ｔｏｒｒない
しは８００Ｔｏｒｒ程度に加圧し、５分以上１時間程度
までの加熱を行って成形体の少なくとも表面より０．５
ｍｍ以上の深さまで窒化する。As another method for producing the nitrided sintered member, Cr: 6% by weight or more and 30% by weight or less, M
o: 5 wt% or less, in some cases Si: 2 wt% or less, Ni: 5 wt% or less, C: 3 wt% or less, the balance being a steel alloy powder consisting essentially of Fe, and FeMo, FeW, F
20% by weight or less of one or two or more kinds of hard particles selected from eCr, CaF 2 , BaF 2 , BN, M
2 % by weight or less of one or more lubricating components selected from oS 2 and WS 2 and, if necessary, an auxiliary component such as an appropriate binder and the like are uniformly dispersed and molded, After performing appropriate dewaxing, the molded body is
At a temperature of 00 ° C. or higher, nitrogen gas is pressurized to about 100 Torr or 800 Torr, and heating is performed for 5 minutes or more and up to about 1 hour to obtain 0.5 or more from at least the surface of the compact.
Nitriding to a depth of mm or more.
【００２７】窒化後は、そのまま窒素ガス急冷すること
により焼入れまでを一工程で実施することが可能である
が、焼入れは別工程であってもよい。After nitriding, it is possible to perform quenching in one step by quenching nitrogen gas as it is, but quenching may be performed in another step.
【００２８】[0028]
【発明の作用】本発明に係わる窒化焼結部材およびその
製造方法では、所定の成分組成をもつ粉末の成形体を焼
結時ないしは焼結後に窒素ガス中で加熱・加圧すること
によってその内部まですなわち少なくとも表面より０．
５ｍｍ以上の深さまで窒化させたものであるから、適量
のＣｒ系窒化物，Ｆｅ系窒化物，Ｃｒ−Ｍｏ系複炭化物
等が分散していると共に、硬質粒子として適量のＦｅＭ
ｏおよび潤滑成分として適量のＣａＦ２が分散している
ものとなっていることから、耐摩耗性に優れた高強度の
窒化焼結部材となる。In the nitriding sintered member and the method for producing the same according to the present invention, a powder compact having a predetermined component composition is heated / pressurized in nitrogen gas during or after sintering to reach its interior. That is, at least 0.
Since it is nitrided to a depth of 5 mm or more, an appropriate amount of Cr-based nitride, Fe-based nitride, Cr-Mo-based double carbide, etc. are dispersed, and an appropriate amount of FeM as hard particles.
Since o and a proper amount of CaF 2 as a lubricating component are dispersed, a high-strength nitrided sintered member having excellent wear resistance is obtained.
【００２９】[0029]
（実施例１）表１に示す組成の焼結体が得られるように
原料粉末を調製し、０．７５重量％のステアリン酸亜鉛
と共に混合した後、成形圧力６ｔｏｎ／ｃｍ２で直径１
１ｍｍ×高さ１０ｍｍに成形した。(Example 1) A raw material powder was prepared so that a sintered body having a composition shown in Table 1 was obtained, mixed with 0.75% by weight of zinc stearate, and then molded at a molding pressure of 6 ton / cm 2 to have a diameter of 1
It was molded into 1 mm × height 10 mm.
【００３０】この成形体を下記に示す条件で焼結並びに
窒化処理を行なった。The compact was sintered and nitrided under the conditions shown below.
【００３１】 室温→１２００℃ 真空１０−２ｔｏｒｒ １２００℃×４０分 〃 １２００℃×２０分 Ｎ２ガス １００ｔｏｒｒ １２００℃→室温 Ｎ２ガス ２ｂａｒｒ この処理の結果、表２に示す特性の焼結体よりなる窒化
焼結部材が得られた。Room temperature → 1200 ° C. Vacuum 10 −2 torr 1200 ° C. × 40 minutes 〃 1200 ° C. × 20 minutes N 2 gas 100 torr 1200 ° C. → room temperature N 2 gas 2 barr As a result of this treatment, a sintered body having the characteristics shown in Table 2 is obtained. A nitride sintered member was obtained.
【００３２】[0032]
【表１】 [Table 1]
【００３３】[0033]
【表２】 [Table 2]
【００３４】表２に示した結果より明らかなように、本
発明を実施することにより、焼結工程のみで窒化された
窒化焼結部材を得ることが可能であった。As is clear from the results shown in Table 2, by carrying out the present invention, it was possible to obtain a nitrided sintered member that was nitrided only in the sintering step.
【００３５】（実施例２）実施例１で用いた原料粉末に
黒鉛を加えて、表３に示す組成の焼結体が得られるよう
に原料粉末を調製した後、実施例１と同様の条件で成形
並びに窒化処理を行なった。この処理の結果、表４に示
す特性の焼結体よりなる窒化焼結部材が得られた。Example 2 Graphite was added to the raw material powder used in Example 1 to prepare a raw material powder so that a sintered body having the composition shown in Table 3 was obtained, and then the same conditions as in Example 1 were applied. Was molded and nitrided. As a result of this treatment, a nitrided sintered member made of a sintered body having the characteristics shown in Table 4 was obtained.
【００３６】[0036]
【表３】 [Table 3]
【００３７】[0037]
【表４】 [Table 4]
【００３８】表４に示した結果より明らかなように、黒
鉛を添加することによって、焼結体中の残留窒素が増加
し、窒化が一層起きやすくなるとともに、残留酸素は減
少し、より望ましい焼結体を得ることができた。また、
残留炭素が増えることにより強度の向上も得ることがで
きた（後述の表８参照）。As is clear from the results shown in Table 4, by adding graphite, the residual nitrogen in the sintered body is increased, nitriding is more likely to occur, and the residual oxygen is reduced. I was able to get a unity. Also,
It was also possible to improve the strength by increasing the residual carbon (see Table 8 below).
【００３９】（実施例３）実施例１で用いた原料粉末に
黒鉛粉末と、カーボニルニッケルを加えて、表５に示す
組成の焼結体が得られるように原料粉末を調製した後、
実施例１と同様の条件で成形並びに窒化処理を行なった
ところ、焼結体の残留窒素は０．１重量％程度で窒化の
効果が十分得られなかったので、窒化処理条件を変え
て、下記に示す条件で焼結並びに窒化処理を行なった。Example 3 Graphite powder and carbonyl nickel were added to the raw material powder used in Example 1 to prepare a raw material powder so that a sintered body having the composition shown in Table 5 was obtained.
When molding and nitriding were performed under the same conditions as in Example 1, the residual nitrogen in the sintered body was about 0.1% by weight, and the effect of nitriding was not sufficiently obtained. Sintering and nitriding were performed under the conditions shown in.
【００４０】 室温→１２００℃ 真空１０−２ｔｏｒｒ １２００℃×４０分 〃 １２００℃×２０分 Ｎ２ガス ６００ｔｏｒｒ １２００℃→室温 Ｎ２ガス ２ｂａｒｒ この処理の結果、表６に示す特性の焼結体よりなる窒化
焼結部材が得られた。Room temperature → 1200 ° C. Vacuum 10 −2 torr 1200 ° C. × 40 minutes 〃 1200 ° C. × 20 minutes N 2 gas 600 torr 1200 ° C. → room temperature N 2 gas 2 barr As a result of this treatment, a sintered body having the characteristics shown in Table 6 is obtained. A nitride sintered member was obtained.
【００４１】[0041]
【表５】 [Table 5]
【００４２】[0042]
【表６】 [Table 6]
【００４３】表６に示した結果より明らかなように、窒
化焼結体が容昜に得られ、さらに強度の向上した焼結体
が得られた。また、この結果から、Ｎｉを添加して高強
度の焼結体を得るには、窒化処理においてＮ２ガスの圧
力を高くすることが必要であることが認められた。As is clear from the results shown in Table 6, a nitrided sintered body was easily obtained, and a sintered body having further improved strength was obtained. From this result, it was confirmed that in order to obtain a high-strength sintered body by adding Ni, it is necessary to increase the pressure of N 2 gas in the nitriding treatment.
【００４４】（評価例）実施例１〜３で得られた各焼結
体と、比較例として実施例１と同じ合金組成であるが窒
化処理をしないで得られた焼結体、および現用材として
表７に示す合金組成を持ち、１１６０℃×６０分真空焼
結→熱間鍛造→１１６０℃×６０分真空焼結→Ｎ２ガス
２ｂａｒｒ冷却して得られた焼結体をそれぞれ６５０℃
の時効処理を施して、各焼結体の引っ張り強さ，摩耗量
を測定したところ、表８に示す結果であった。(Evaluation Example) Each of the sintered bodies obtained in Examples 1 to 3, as a comparative example, a sintered body having the same alloy composition as that of Example 1 but not subjected to the nitriding treatment, and the working material. And the alloy composition shown in Table 7 is obtained by vacuum sintering at 1160 ° C. for 60 minutes → hot forging → vacuum sintering at 1160 ° C. for 60 minutes → cooling of N 2 gas at 2 barr at 650 ° C.
When the tensile strength and the amount of wear of each sintered body were measured by subjecting the sintered body to the aging treatment, the results are shown in Table 8.
【００４５】[0045]
【表７】 [Table 7]
【００４６】[0046]
【表８】 [Table 8]
【００４７】表８に示した結果より明らかなように、本
発明実施例により得られた各焼結体では、現用材よりも
強度および耐摩耗性に優れた焼結体となっていることが
認められ、このように特性の優れた焼結体が容昜に得ら
れることが確かめられた。As is clear from the results shown in Table 8, each of the sintered bodies obtained according to the examples of the present invention is a sintered body superior in strength and wear resistance to the current material. It was confirmed that it was possible to obtain a sintered body with excellent characteristics.
【００４８】[0048]
【発明の効果】本発明に係わる窒化焼結部材は、Ｃｒ：
６重量％以上３０重量％以下、Ｍｏ：５重量％以下、残
部実質的にＦｅよりなる合金マトリックス中に、ＦｅＭ
ｏ，ＦｅＷ，ＦｅＣｒのうちから選ばれる１種または２
種以上の硬質粒子が２０重量％以下、ＣａＦ２，ＢａＦ
２，ＢＮ，ＭｏＳ２，ＷＳ２のうちから選ばれる１種ま
たは２種以上の潤滑成分が２重量％以下の範囲で分散
し、少なくとも表面より０．５ｍｍ以上の深さまで窒化
焼結している構成となっているので、適量のＣｒ系窒化
物，Ｆｅ系窒化物，Ｃｒ−Ｍｏ系複合炭化物等が分散し
ていると共に、硬質粒子として適量のＦｅＭｏ，Ｆｅ
Ｗ，ＦｅＣｒのうちから選ばれる１種または２種以上お
よび潤滑成分として適量のＣａＦ２，ＢａＦ２，ＢＮ，
ＭｏＳ２，ＷＳ２のうちから選ばれる１種または２種以
上が分散したものとなっていることから、耐摩耗性に優
れた高強度の窒化焼結部材であり、強度および耐摩耗性
に優れていることが要求されるバルブシートや各種摺動
部材等の素材として好適なものであるという著大なる効
果がもたらされ、本発明に係わる窒化焼結部材の製造方
法によって、上記強度および耐摩耗性に優れた窒化焼結
部材が製造されるという著大なる効果がもたらされる。The nitrided sintered member according to the present invention is made of Cr:
FeM in an alloy matrix of 6 wt% or more and 30 wt% or less, Mo: 5 wt% or less, and the balance substantially Fe.
1 or 2 selected from o, FeW and FeCr
20% by weight or less of hard particles of at least one kind, CaF 2 , BaF
2 , 1 or 2 or more kinds of lubricating components selected from 2 , BN, MoS 2 and WS 2 are dispersed in a range of 2% by weight or less, and are nitrided and sintered to at least a depth of 0.5 mm or more from the surface. Since it has a constitution, an appropriate amount of Cr-based nitride, Fe-based nitride, Cr-Mo-based composite carbide, etc. are dispersed, and an appropriate amount of FeMo, Fe as hard particles.
One or more selected from W and FeCr and an appropriate amount of CaF 2 , BaF 2 , BN as a lubricating component,
Since one or more selected from MoS 2 and WS 2 are dispersed, it is a high-strength nitrided sintered member having excellent wear resistance and excellent in strength and wear resistance. It has a great effect that it is suitable as a material for valve seats, various sliding members, etc. which are required to have the above-mentioned strength and resistance by the method for producing a nitrided sintered member according to the present invention. A significant effect is produced that a nitrided sintered member having excellent wear properties is manufactured.
Claims (5)
ｏ：５重量％以下、残部実質的にＦｅよりなる合金マト
リックス中に、ＦｅＭｏ，ＦｅＷ，ＦｅＣｒのうちから
選ばれる１種または２種以上の硬質粒子が２０重量％以
下、ＣａＦ２，ＢａＦ２，ＢＮ，ＭｏＳ２，ＷＳ２のう
ちから選ばれる１種または２種以上の潤滑成分が２重量
％以下の範囲で分散し、少なくとも表面より０．５ｍｍ
以上の深さまで窒化焼結していることを特徴とする耐摩
耗性に優れた高強度窒化焼結部材。1. Cr: 6% by weight or more and 30% by weight or less, M
o: 5% by weight or less, 20% by weight or less of CaF 2 , BaF 2 , one or more kinds of hard particles selected from FeMo, FeW and FeCr in an alloy matrix consisting essentially of Fe. One or more lubricating components selected from BN, MoS 2 and WS 2 are dispersed in a range of 2% by weight or less, and at least 0.5 mm from the surface.
A high-strength nitriding-sintering member having excellent wear resistance, which is nitriding-sintered to the above depth.
以下、Ｎｉ：５重量％以下、Ｃ：３重量％以下を含む請
求項１に記載の耐摩耗性に優れた高強度窒化焼結部材。2. Si: 2% by weight in the alloy matrix
The high-strength nitrided sintered member according to claim 1, which contains Ni: 5 wt% or less and C: 3 wt% or less.
ｏ：５重量％以下、残部実質的にＦｅよりなる鋼合金粉
末と、ＦｅＭｏ，ＦｅＷ，ＦｅＣｒのうちから選ばれる
１種または２種以上の硬質粒子を２０重量％以下と、Ｃ
ａＦ２，ＢａＦ２，ＢＮ，ＭｏＳ２，ＷＳ２のうちから
選ばれる１種または２種以上の潤滑成分を２重量％以下
を混合したのち成形し、成形体を真空中ないしは略真空
中で焼結し、焼結の終了段階でＮ２ガスにより少なくと
も表面より０．５ｍｍ以上の深さまで窒化することを特
徴とする耐摩耗性に優れた高強度窒化焼結部材の製造方
法。3. Cr: 6% by weight or more and 30% by weight or less, M
o: 5 wt% or less, a balance of steel alloy powder consisting essentially of Fe, and 20 wt% or less of one or more hard particles selected from FeMo, FeW, and FeCr, and C
Mixing 2 % by weight or less of one or more lubricating components selected from aF 2 , BaF 2 , BN, MoS 2 , and WS 2 and then molding, and burning the molded body in a vacuum or in a substantially vacuum. A method for producing a high-strength nitrided sintered member having excellent wear resistance, which comprises nitriding with N 2 gas to a depth of at least 0.5 mm or more from the surface at the end of sintering.
ｏ：５重量％以下、残部実質的にＦｅよりなる鋼合金粉
末と、ＦｅＭｏ，ＦｅＷ，ＦｅＣｒのうちから選ばれる
１種または２種以上の硬質粒子を２０重量％以下と、Ｃ
ａＦ２，ＢａＦ２，ＢＮ，ＭｏＳ２，ＷＳ２のうちから
選ばれる１種または２種以上の潤滑成分を２重量％以下
を混合したのち成形し、成形体をＮ２ガス中で焼結して
少なくとも表面より０．５ｍｍ以上の深さまで窒化する
ことを特徴とする耐摩耗性に優れた高強度窒化焼結部材
の製造方法。4. Cr: 6% by weight or more and 30% by weight or less, M
o: 5 wt% or less, a balance of steel alloy powder consisting essentially of Fe, and 20 wt% or less of one or more hard particles selected from FeMo, FeW, and FeCr, and C
After mixing 2% by weight or less of one or more lubricating components selected from aF 2 , BaF 2 , BN, MoS 2 , and WS 2 , the mixture is molded, and the compact is sintered in N 2 gas. A method for producing a high-strength nitrided sintered member having excellent wear resistance, which comprises nitriding at least 0.5 mm or more from the surface.
Ｎｉ：５重量％以下、Ｃ：３重量％以下を含む請求項３
または４に記載の耐摩耗性に優れた高強度窒化焼結部材
の製造方法。5. A steel alloy powder containing Si: 2% by weight or less,
Ni: 5 wt% or less, C: 3 wt% or less is included.
Alternatively, the method for producing a high-strength nitrided sintered member having excellent wear resistance according to 4 above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5084792A JPH06299284A (en) | 1993-04-12 | 1993-04-12 | High strength nitrided sintered member excellent in wear resistance and its production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5084792A JPH06299284A (en) | 1993-04-12 | 1993-04-12 | High strength nitrided sintered member excellent in wear resistance and its production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06299284A true JPH06299284A (en) | 1994-10-25 |
Family
ID=13840558
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5084792A Pending JPH06299284A (en) | 1993-04-12 | 1993-04-12 | High strength nitrided sintered member excellent in wear resistance and its production |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06299284A (en) |
Cited By (5)
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|---|---|---|---|---|
| WO1997005980A1 (en) * | 1995-08-08 | 1997-02-20 | Komatsu Ltd. | Self-lubricating sintered sliding material and method for manufacturing the same |
| WO1999025889A1 (en) * | 1997-11-14 | 1999-05-27 | Mitsubishi Materials Co. | VALVE SEAT MADE OF Fe-BASE SINTERED ALLOY EXCELLENT IN WEAR RESISTANCE |
| WO2005037469A1 (en) * | 2003-10-21 | 2005-04-28 | Matsushita Electric Industrial Co., Ltd. | Wear-resistant parts and method for manufacture thereof |
| CN114054747A (en) * | 2022-01-11 | 2022-02-18 | 爱柯迪股份有限公司 | Boron nitride powder composite doped stainless steel piston ring for engine and preparation method thereof |
| CN114082960A (en) * | 2021-11-11 | 2022-02-25 | 江苏徐工工程机械研究院有限公司 | Preparation method of shaft sleeve, shaft sleeve and excavator |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997005980A1 (en) * | 1995-08-08 | 1997-02-20 | Komatsu Ltd. | Self-lubricating sintered sliding material and method for manufacturing the same |
| US6015775A (en) * | 1995-08-08 | 2000-01-18 | Komatsu Ltd. | Self-lubricating sintered sliding material and method for manufacturing the same |
| WO1999025889A1 (en) * | 1997-11-14 | 1999-05-27 | Mitsubishi Materials Co. | VALVE SEAT MADE OF Fe-BASE SINTERED ALLOY EXCELLENT IN WEAR RESISTANCE |
| WO2005037469A1 (en) * | 2003-10-21 | 2005-04-28 | Matsushita Electric Industrial Co., Ltd. | Wear-resistant parts and method for manufacture thereof |
| JPWO2005037469A1 (en) * | 2003-10-21 | 2007-11-22 | 松下電器産業株式会社 | Abrasion resistant parts and method of manufacturing |
| JP4668793B2 (en) * | 2003-10-21 | 2011-04-13 | パナソニック株式会社 | Abrasion resistant parts and method of manufacturing |
| CN114082960A (en) * | 2021-11-11 | 2022-02-25 | 江苏徐工工程机械研究院有限公司 | Preparation method of shaft sleeve, shaft sleeve and excavator |
| WO2022193752A1 (en) * | 2021-11-11 | 2022-09-22 | 江苏徐工工程机械研究院有限公司 | Bushing manufacturing method, bushing, and excavator |
| CN114082960B (en) * | 2021-11-11 | 2023-01-17 | 江苏徐工工程机械研究院有限公司 | Preparation method of shaft sleeve, shaft sleeve and excavator |
| CN114054747A (en) * | 2022-01-11 | 2022-02-18 | 爱柯迪股份有限公司 | Boron nitride powder composite doped stainless steel piston ring for engine and preparation method thereof |
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