JP3225649B2 - Wear resistant iron-based sintered alloy - Google Patents
Wear resistant iron-based sintered alloyInfo
- Publication number
- JP3225649B2 JP3225649B2 JP32571492A JP32571492A JP3225649B2 JP 3225649 B2 JP3225649 B2 JP 3225649B2 JP 32571492 A JP32571492 A JP 32571492A JP 32571492 A JP32571492 A JP 32571492A JP 3225649 B2 JP3225649 B2 JP 3225649B2
- Authority
- JP
- Japan
- Prior art keywords
- powder
- iron
- alloy
- less
- resistance
- 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.)
- Expired - Fee Related
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims description 56
- 229910045601 alloy Inorganic materials 0.000 title claims description 34
- 239000000956 alloy Substances 0.000 title claims description 34
- 229910052742 iron Inorganic materials 0.000 title claims description 24
- 239000000843 powder Substances 0.000 claims description 34
- 239000002245 particle Substances 0.000 claims description 21
- 229910052750 molybdenum Inorganic materials 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 10
- 229910052799 carbon Inorganic materials 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 8
- 239000000314 lubricant Substances 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 3
- 238000005245 sintering Methods 0.000 claims description 2
- 238000007493 shaping process Methods 0.000 claims 1
- 239000000463 material Substances 0.000 description 20
- 238000005260 corrosion Methods 0.000 description 12
- 230000007797 corrosion Effects 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 11
- 239000011159 matrix material Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 8
- 239000006104 solid solution Substances 0.000 description 8
- 229910001309 Ferromolybdenum Inorganic materials 0.000 description 7
- 238000005275 alloying Methods 0.000 description 7
- 229910000604 Ferrochrome Inorganic materials 0.000 description 6
- 238000005299 abrasion Methods 0.000 description 6
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 229910001145 Ferrotungsten Inorganic materials 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 3
- 229910020630 Co Ni Inorganic materials 0.000 description 2
- 229910002440 Co–Ni Inorganic materials 0.000 description 2
- 229910017112 Fe—C Inorganic materials 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 229910001563 bainite Inorganic materials 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- -1 Co: 4.1% Inorganic materials 0.000 description 1
- 229910001182 Mo alloy Inorganic materials 0.000 description 1
- 229910017313 Mo—Co Inorganic materials 0.000 description 1
- 229910000978 Pb alloy Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910000756 V alloy Inorganic materials 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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- Powder Metallurgy (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は、内燃機関に使用される
バルブシート、ピストンリング或いは排気系のカラー等
の焼結部品に有用な耐摩耗性に優れた鉄基焼結合金に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an iron-based sintered alloy having excellent wear resistance and useful for sintered parts such as valve seats, piston rings or exhaust system collars used in internal combustion engines.
【0002】[0002]
【従来の技術】従来のバルブシート材料としては、Fe
−C−Co−Ni基材料、Fe−C基材料に耐摩耗性の
向上を狙ってフェロモリブデン(Fe−Mo)、フェロ
クロム(Fe−Cr)等の金属間化合物またはFe−C
−Cr−Mo−V合金等を添加したものが使用されてい
る(特開昭56−154110号公報)。2. Description of the Related Art Conventional valve seat materials include Fe.
Intermetallic compounds such as ferromolybdenum (Fe-Mo) and ferrochrome (Fe-Cr) or Fe-C for the purpose of improving wear resistance of -C-Co-Ni-based material and Fe-C-based material
-Cr-Mo-V alloy or the like is used (JP-A-56-154110).
【0003】さらに、CrおよびMoを含有するFe−
C基地組織中に、Cr、Mo、V等からなる鉄系硬質粒
子を分散させ耐摩耗性と相手攻撃性を改善した焼結合金
(特開昭60−224762号公報)、またFe−C−
Co−Ni系基地組織中にFeMoおよびFeWからな
る硬質粒子を分散させさらにPb合金等を含浸させて耐
摩耗性を改善した焼結合金(特開昭62−202058
号公報)が開示されている。Further, Fe— containing Cr and Mo
A sintered alloy in which iron-based hard particles composed of Cr, Mo, V, etc. are dispersed in a C base structure to improve abrasion resistance and aggressiveness to a partner (Japanese Patent Laid-Open No. 60-224762), and Fe-C-
A sintered alloy in which hard particles made of FeMo and FeW are dispersed in a Co-Ni base matrix and impregnated with a Pb alloy or the like to improve wear resistance (Japanese Patent Laid-Open No. 62-202058)
Gazette).
【0004】バルブシート材に要求される特性として
は、耐摩耗性の他に耐腐食性および耐熱性が挙げられ、
耐摩耗性は主として硬質粒子が受持ち、耐腐食性および
耐熱性は主として基地組織が受持ち、両者が相まって耐
久性を確保している。[0004] The characteristics required for the valve seat material include corrosion resistance and heat resistance in addition to wear resistance.
Hard particles are mainly responsible for wear resistance, and corrosion resistance and heat resistance are mainly responsible for base structures, and the two are combined to ensure durability.
【0005】[0005]
【発明が解決しようとする課題】最近、自動車エンジン
において、長寿命化、高出力、高回転化、排出ガス浄化
対策、あるいは燃費向上対策に対する改善要求が一段と
高まっている。このため、自動車エンジンにおけるエン
ジンバルブ、バルブシートに対しては、従来にも増して
厳しい使用環境に耐えることが不可避となってきてお
り、耐熱性、耐摩耗性をより一層向上させると共に、高
温での耐腐食性を向上させる必要が生じてきた。In recent years, there has been a growing demand for improvement in automobile engines for longer life, higher output, higher rotation speed, measures for purifying exhaust gas, or measures for improving fuel efficiency. For this reason, it has become unavoidable for engine valves and valve seats in automobile engines to withstand more severe use environments than ever before, and heat resistance and wear resistance are further improved, and at high temperatures. It has become necessary to improve the corrosion resistance of steel.
【0006】しかるに、従来の鉄系バルブシート材料の
基地の形成は、鉄粉に対して、合金元素であるNi、C
o、Mo等のそれぞれの元素の要素粉末を混合後、この
混合粉末を原料として成形、焼結し、Ni、Co、Mo
等を鉄中に拡散させている。そのため、これら合金元素
を鉄中に完全に拡散させることが難しく、添加量に見合
った特性の向上が得られにくい。[0006] However, the formation of the base of the conventional iron-based valve seat material is based on the alloying elements Ni, C
After mixing elemental powders of the respective elements such as o, Mo, etc., the mixed powder is molded and sintered as a raw material to obtain Ni, Co, Mo.
Etc. are diffused in iron. For this reason, it is difficult to completely diffuse these alloy elements into iron, and it is difficult to improve properties corresponding to the added amount.
【0007】そこで、合金元素添加の効果を効率良く引
き出すために、合金元素を予め鉄と合金化することが考
えられるが、これら合金元素を鉄と予め合金化すると、
固溶硬化により合金鉄粉の圧縮性が低下するため、圧粉
体の高密度化が難しくなり、耐久性向上に対し不利に作
用する。また、耐熱性、耐摩耗性、耐食性といった特性
向上の要求も高く、適切な成分が必要である。Therefore, in order to efficiently bring out the effect of alloying element addition, it is conceivable to alloy the alloying element with iron in advance.
The solid solution hardening reduces the compressibility of the alloyed iron powder, making it difficult to increase the density of the green compact, which is disadvantageous for improving the durability. In addition, there is a high demand for improvement in properties such as heat resistance, abrasion resistance, and corrosion resistance, and appropriate components are required.
【0008】本発明は従来の鉄系バルブシート材料に用
いられる鉄基焼結合金の前記のごとき問題点を解決すべ
くなされたものであって、近年のバルブシート材料の厳
しい使用環境に対応し、耐熱性、耐腐食性、耐摩耗性を
より一層向上させた鉄系焼結合金を提供することを目的
とする。The present invention has been made to solve the above-mentioned problems of the iron-based sintered alloy used for the conventional iron-based valve seat material, and has been adapted to the severe use environment of recent valve seat materials. It is an object of the present invention to provide an iron-based sintered alloy having further improved heat resistance, corrosion resistance, and wear resistance.
【0009】[0009]
【課題を解決するための手段】発明者等は、鉄粉に添加
元素を合金化すると合金粉末が固溶硬化して圧縮性が低
下することに鑑み、合金化しても固溶硬化しない添加元
素の組成範囲について研究を進めた。その結果、添加元
素の特定組成範囲において、合金粉末の圧縮性が確保で
きることを見出した。また、前記特定組成範囲の合金粉
末を用いた場合、焼結体の耐腐食性および耐摩耗性の向
上についても研究を重ね、特定の添加元素の組合せと、
硬質粒子を分散させることにより、焼結体の耐腐食性お
よび耐摩耗性が著しく向上することを見出して、本発明
を完成した。In view of the fact that when alloying an additive element with iron powder, the alloy powder is solid-solution hardened and the compressibility is reduced, the present inventors have proposed an additive element which does not form a solid solution hardening even when alloyed. Research on the composition range of As a result, it has been found that the compressibility of the alloy powder can be ensured in the specific composition range of the additive element. Further, when using the alloy powder of the specific composition range, repeated studies on the corrosion resistance and wear resistance of the sintered body, a combination of specific additional elements,
The present inventors have found that by dispersing the hard particles, the corrosion resistance and wear resistance of the sintered body are significantly improved, and completed the present invention.
【0010】本発明の耐摩耗性に優れた鉄基焼結合金
は、重量比で、Co;2〜15%、Mo;3〜10%を
含有し、残部が不可避不純物とFeからなる鉄基合金粉
末に対し、Fe−55〜70%Mo−0.5%以下C、
Fe−55〜70%Cr−0.5%以下C、Fe−75
〜85%W−0.5%以下Cの硬質粒子の1種または2
種以上を合計で2〜30%、黒鉛粉末0.3〜1.7%
と成形用潤滑剤を混合し、成形し、焼結して得られたこ
とを要旨とする。The iron-based sintered alloy of the present invention having excellent wear resistance contains, by weight, 2-15% of Co and 3-10% of Mo, with the balance being an iron-based alloy composed of unavoidable impurities and Fe. Based on the alloy powder, Fe-55 to 70% Mo-0.5% or less C,
Fe-55 to 70% Cr-0.5% or less C, Fe-75
One or more hard particles of up to 85% W-0.5% or less C
2 to 30% in total of more than seeds, 0.3 to 1.7% of graphite powder
And a molding lubricant, and then molded and sintered.
【0011】[0011]
【作用】本発明の鉄基焼結合金は、重量比でCo;2〜
15%、Mo;3〜10%を含有した合金粉末を用いて
基地組織を焼結したので、合金元素の素地への固溶均質
度が高く、要素粉末を混合する従来法に比べて、少ない
合金量で優れた耐腐食性、耐酸化性および耐摩耗性を得
ることができる。The iron-based sintered alloy of the present invention has a weight ratio of Co;
Since the base structure was sintered using an alloy powder containing 15%, Mo; 3 to 10%, the homogeneity of solid solution of the alloy element in the base material was high, and the solid solution was less than the conventional method of mixing the element powder. Excellent corrosion resistance, oxidation resistance and wear resistance can be obtained with the amount of alloy.
【0012】また、鉄基合金元粉末のCoおよびMo含
有量を前記組成範囲に規制したので、圧縮性の低下割合
が少なく、要素粉末を混合する従来法に比べて、圧縮性
が若干低下するもののほぼ同等であり、密度と関連性の
強い耐酸化性、耐食性に対して影響を及ぼすおそれはな
がなく、添加量に見合った特性の向上が得られる。さら
に、この基地組織に硬質粒子を分散したので、耐摩耗性
に優れる。Further, since the contents of Co and Mo in the iron-base alloy base powder are restricted to the above-mentioned composition ranges, the compressibility is less reduced, and the compressibility is slightly lowered as compared with the conventional method of mixing element powders. However, there is no danger of affecting the oxidation resistance and corrosion resistance, which are strongly related to the density, and the characteristics corresponding to the added amount can be improved. Further, since hard particles are dispersed in the matrix, the abrasion resistance is excellent.
【0013】本発明の鉄基焼結合金は、従来の要素粉を
混合した焼結合金がMo、Co濃度にバラツキがあり、
オーステナイト生成元素のCo濃度の高いところでオー
ステナイトとなり、フェライト生成元素のMoの多いと
ころはパーライトとなり、混合組織となるので耐摩耗性
に劣るのに対して、CoおよびMoがFe基地に均一に
固溶するので、基地がベイナイトとなり、耐摩耗性に優
れる。[0013] In the iron-based sintered alloy of the present invention, the sintered alloy obtained by mixing the conventional element powders has variations in Mo and Co concentrations.
Where austenite-forming element Co has high Co concentration, it becomes austenite, and where ferrite-forming element Mo is high, it becomes pearlite and has a mixed structure, resulting in poor abrasion resistance. Therefore, the base becomes bainite and has excellent wear resistance.
【0014】次に、本発明において、合金元素等の組成
範囲を限定した理由について説明する。 Fe−2〜15%Co−2〜10%Mo合金粉末;この
合金粉末は本発明材のマトリックスを形成するものであ
り、Coは素地に固溶してこれを強化するとともに、耐
熱性を向上させる効果があるが、2%未満ではその効果
が不足し、一方15%を越えて含有させると効果のさら
なる向上は見られるものの経済性に欠けるため、この点
を考慮してその含有量を2〜15%と定めた。Next, the reason why the composition range of alloying elements and the like in the present invention is limited will be described. Fe-2 to 15% Co-2 to 10% Mo alloy powder; this alloy powder forms the matrix of the material of the present invention, and Co forms a solid solution in the matrix to strengthen it and improve heat resistance. When the content is less than 2%, the effect is insufficient. On the other hand, when the content is more than 15%, the effect is further improved, but the economy is low. 1515%.
【0015】Moは素地に固溶してこれを強化するとと
もに、高温域における強度および耐腐食性の改善に効果
を示し、炭素を含む焼結体においては、一部が炭化物を
生成し耐摩耗性の改善に効果を示す。これらの効果は、
含有量が3%未満では不充分であり、10%を越えると
効果の向上は認められるものの、粉末の圧縮性低下を招
くため、3〜10%と定めた。Mo forms a solid solution in the matrix and strengthens it, and also has the effect of improving the strength and corrosion resistance in a high-temperature region. It is effective in improving sex. These effects are
If the content is less than 3%, the content is insufficient, and if it exceeds 10%, although the effect is improved, the compressibility of the powder is reduced.
【0016】Fe−Mo、Fe−Cr、Fe−W(硬質
粒子粉末);2〜30% Fe−Mo、Fe−Cr、Fe−W粉は、基地中に分散
し、耐摩耗性向上に寄与する。この硬質粒子の添加量が
2%未満では、耐摩耗性向上が不充分であり、30%を
越えて添加しても、添加の割に向上が小さく、また成形
性の低下を招くため、その添加量を2〜30%とした。
なお、硬質粉末粒子の粒径は149μm以下とすること
が好ましい。粒径が149μmを越えると基地組織中に
均一に分散しなくなるからである。Fe-Mo, Fe-Cr, Fe-W (hard particle powder): 2 to 30% Fe-Mo, Fe-Cr, Fe-W powder is dispersed in the matrix and contributes to improvement of wear resistance. I do. If the addition amount of the hard particles is less than 2%, the improvement of the wear resistance is insufficient, and even if it exceeds 30%, the improvement is small for the addition, and the moldability is lowered. The addition amount was 2 to 30%.
The hard powder particles preferably have a particle size of 149 μm or less. If the particle size exceeds 149 μm, the particles will not be uniformly dispersed in the matrix.
【0017】黒鉛粉末;0.3〜1.7% 黒鉛は炭素分としてマトリックスに固溶しマトリックス
を強化するとともに、一部はマトリックス中のFeまた
はMoと炭化物を形成し、耐摩耗性の向上に効果を示
す。添加量が0.3%未満では前記効果が期待できず、
また1.7%を越えて添加すると焼結合金を脆化させる
ので、その添加量を0.3〜1.7%に限定した。な
お、黒鉛粉末粒子の粒径は45μm以下とすることが好
ましい。粒径が45μmを越えると炭素濃度が不均一に
なるからである。Graphite powder; 0.3 to 1.7% Graphite is dissolved in the matrix as a carbon component to strengthen the matrix, and partly forms carbide with Fe or Mo in the matrix to improve wear resistance. The effect is shown. If the added amount is less than 0.3%, the above effect cannot be expected,
Further, if added in excess of 1.7%, the sintered alloy will be embrittled, so the amount added is limited to 0.3-1.7%. Preferably, the particle size of the graphite powder particles is 45 μm or less. If the particle size exceeds 45 μm, the carbon concentration becomes non-uniform.
【0018】[0018]
【実施例】本発明の好適な実施例を比較例と対比して説
明し、本発明の特徴を明らかにする。本発明の実施例1
〜8として、重量比でCo;4.4%、Mo;4.1%
残部が実質的にFeである鉄基噴霧合金粉A、重量比で
Co;4.1%、Mo;7.2%残部が実質的にFeで
ある鉄基噴霧合金粉B(いずれも粒径177μm以下)
をアトマイズ法により製作するとともに、市販の純鉄粉
(粒径177μm以下)とフェロモリブデン粉(Fe−
61%Mo−0.6%Si−0.03%C)、フェロク
ロム粉(Fe−60%Cr−0.3%Si−0.002
%C)、フェロタングステン粉(Fe−79%W−0.
2%Si−0.03%C)を搗砕して粒径149μm以
下にしたものと、黒鉛粉および潤滑剤ステアリン酸亜鉛
を準備し、表1に示す配合組成になるように秤量後、密
度6.9g/cm3の圧粉体を成形した。DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described in comparison with comparative examples to clarify the features of the present invention. Embodiment 1 of the present invention
-8, Co; 4.4%, Mo; 4.1% by weight.
Iron-based sprayed alloy powder A in which the balance is substantially Fe, Co: 4.1%, Mo; 7.2% in weight ratio Iron-based sprayed alloy powder B in which the balance is substantially Fe (177 μm or less)
Was manufactured by the atomizing method, and commercially available pure iron powder (particle size: 177 μm or less) and ferromolybdenum powder (Fe-
61% Mo-0.6% Si-0.03% C), ferrochrome powder (Fe-60% Cr-0.3% Si-0.002)
% C), ferrotungsten powder (Fe-79% W-0.
2% Si-0.03% C) were ground to a particle size of 149 μm or less, graphite powder and a lubricant zinc stearate were prepared, weighed so as to have a composition shown in Table 1, and then weighed. A compact of 6.9 g / cm 3 was molded.
【0019】また、比較材1〜3として、鉄基噴霧合金
粉A、噴霧鉄粉、Co粉、Mo粉、搗砕して粒径149
μm以下にしたフェロモリブデン粉(Fe−61%Mo
−0.6%Si−0.03%C)およびフェロタングス
テン粉(Fe−79%W−0.2%Si−0.03%
C)、黒鉛粉および潤滑剤ステアリン酸亜鉛を準備し、
表1に示す配合組成になるように秤量後、密度6.9g
/cm3の圧粉体を成形した。得られた実施例および比
較例の圧粉体を分解アンモニアガス雰囲気中で、138
3Kの温度で2.4Ksの時間焼結合金し、各実施例と
比較材を製作した。Further, as comparative materials 1 to 3, iron-based sprayed alloy powder A, sprayed iron powder, Co powder, Mo powder, and ground to a particle size of 149
μm or less ferromolybdenum powder (Fe-61% Mo)
-0.6% Si-0.03% C) and ferrotungsten powder (Fe-79% W-0.2% Si-0.03%)
C), prepare graphite powder and lubricant zinc stearate,
After weighing so as to have the composition shown in Table 1, the density was 6.9 g.
/ Cm 3 was molded. The obtained green compacts of Examples and Comparative Examples were decomposed in an atmosphere of decomposed ammonia gas to 138.
The alloy was sintered at a temperature of 3 K for 2.4 Ks for a period of 2.4 Ks to produce each example and comparative material.
【0020】[0020]
【表1】 [Table 1]
【0021】得られた各実施例および比較材をバルブシ
ートリングに加工し、実機に模したバルブ・バルブシー
ト試験機を用い、耐摩耗性を調査した。この試験装置
は、プロパンガスの燃焼によってバルブとバルブシート
を加熱し、カムの駆動によってバルブを開閉する機構に
より、バルブとバルブシートの叩き摩耗状況を再現する
ものである。Each of the obtained examples and comparative materials was processed into a valve seat ring, and abrasion resistance was examined using a valve / valve seat tester simulating an actual machine. This test apparatus reproduces the beating wear of the valve and the valve seat by a mechanism that heats the valve and the valve seat by burning propane gas and opens and closes the valve by driving a cam.
【0022】試験は、バルブ材質をJIS SUH4と
し、バルブの温度を1023K、バルブシートの温度を
623Kに保つよう制御し、カムの回転数を2000r
pmにし、運転時間36Ksの条件で行い、バルブシー
ト摩耗量をバルブシートの当り幅増加量として測定し
た。得られた結果は図1に示した。In the test, the valve material was set to JIS SUH4, the temperature of the valve was controlled to 1023K, the temperature of the valve seat was maintained to 623K, and the number of rotations of the cam was set to 2000 rpm.
pm and the operation time was 36 Ks, and the amount of valve seat wear was measured as the increase in the contact width of the valve seat. The results obtained are shown in FIG.
【0023】図1に示したように、比較材の当り幅増加
量が90〜120μmであるのに対して、本発明の実施
例の当り幅増加量は45〜75μmであって、本発明合
金は耐摩耗性に優れていることが確認された。なお、実
施例3と比較材3、並びに実施例4と比較材1とはそれ
ぞれ焼結体組成は同じであるが、摩耗量は実施例が比較
材の約半分に減少しており、実施例の耐摩耗性が従来材
に比べて優れていることがわかる。As shown in FIG. 1, the contact width increase of the comparative material is 90 to 120 μm, whereas the contact width increase of the embodiment of the present invention is 45 to 75 μm. Was confirmed to have excellent wear resistance. Although the sintered body compositions of Example 3 and Comparative Material 3 and Example 4 and Comparative Material 1 were the same, the wear amount was reduced to about half of that of Comparative Example. It can be seen that the abrasion resistance of the material was superior to that of the conventional material.
【0024】これは、本発明の特徴とするところであ
り、Fe−Mo−Coを予め合金粉にて形成させること
により、比較材のように要素粉を混合させたものに比べ
均質化に優れた基地組織を得ることが可能となり、同一
組成でありながら耐摩耗性に優れた鉄基焼結合金を得る
ことができた。This is a feature of the present invention. By forming Fe-Mo-Co in advance as an alloy powder, the homogeneity is superior to that obtained by mixing element powders as a comparative material. It was possible to obtain a base structure, and it was possible to obtain an iron-based sintered alloy having the same composition and excellent wear resistance.
【0025】[0025]
【発明の効果】本発明の耐摩耗性鉄基焼結合金は以上説
明したように、重量比で、Co;2〜15%、Mo;3
〜10%を含有し、残部が不可避不純物とFeからなる
鉄基合金粉末に対し、フェロモリブデン粉、フェロクロ
ム粉、フェロタングステン粉の硬質粒子の1種または2
種以上を合計で2〜30%、黒鉛粉末0.3〜1.7%
と成形用潤滑剤を混合し、成形し、焼結して得られたこ
とを特徴とするものであって、合金元素の素地への固溶
均質度が高く、要素粉末を混合する従来法に比べて、少
ない合金量で優れた耐腐食性、耐酸化性および耐摩耗性
を得ることができる。合金元素の組成範囲を前記組成範
囲に規制したので、圧縮性の低下割合が少なく、要素粉
末を混合する従来法に比べて、圧縮性が若干低下するも
ののほぼ同等であり、密度と関連性の強い耐酸化性、耐
食性に対して影響を及ぼすおそれはない。また、硬質粒
子を分散させたのでさらに耐摩耗性が向上し、Coおよ
びMoがFe基地に均一に固溶するので、基地がベイナ
イトとなり、耐摩耗性に優れる。As described above, the wear-resistant iron-based sintered alloy of the present invention has a weight ratio of Co: 2 to 15% and Mo: 3 as described above.
One or two of hard particles of ferromolybdenum powder, ferrochrome powder, and ferrotungsten powder with respect to an iron-based alloy powder containing 10% to 10%, with the balance being unavoidable impurities and Fe.
2 to 30% in total of more than seeds, 0.3 to 1.7% of graphite powder
It is obtained by mixing, molding, and sintering, and has a high degree of solid solution uniformity of the alloying element in the base material. In comparison, excellent corrosion resistance, oxidation resistance and wear resistance can be obtained with a small amount of alloy. Since the composition range of the alloying element is restricted to the above composition range, the compressibility is less reduced, and as compared with the conventional method of mixing the element powders, the compressibility is slightly reduced but almost the same, and the density and relevance are reduced. There is no risk of affecting strong oxidation resistance and corrosion resistance. Further, since the hard particles are dispersed, the wear resistance is further improved, and Co and Mo are uniformly dissolved in the Fe base, so that the base becomes bainite and the wear resistance is excellent.
【図1】摩耗試験における本発明の実施例と比較例の摩
耗量を示す図である。FIG. 1 is a diagram showing the wear amount of an example of the present invention and a comparative example in a wear test.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平2−111848(JP,A) 特開 昭63−317646(JP,A) (58)調査した分野(Int.Cl.7,DB名) C22C 38/00 304 B22F 1/00 B22F 5/00 C22C 33/02 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-111848 (JP, A) JP-A-63-317646 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) C22C 38/00 304 B22F 1/00 B22F 5/00 C22C 33/02
Claims (1)
〜10%を含有し、残部が不可避不純物とFeからなる
鉄基合金粉末に対し、Fe−55〜70%Mo−0.5
%以下C、Fe−55〜70%Cr−0.5%以下C、
Fe−75〜85%W−0.5%以下Cの硬質粒子の1
種または2種以上を合計で2〜30%、黒鉛粉末0.3
〜1.7%と成形用潤滑剤を混合し、成形し、焼結して
得られたことを特徴とする耐摩耗性に優れた鉄基焼結合
金。1. A weight ratio of Co: 2 to 15%, Mo: 3
Fe-55 to 70% Mo-0.5 with respect to an iron-based alloy powder containing 10% to 10%, with the balance being unavoidable impurities and Fe.
% Or less C, Fe-55 to 70% Cr-0.5% or less C,
Fe-75 to 85% W-0.5% or less C of hard particles 1
2-30% in total of two or more species, graphite powder 0.3
An iron-based sintered alloy having excellent wear resistance, which is obtained by mixing, shaping, and sintering a mixture of about 1.7% with a forming lubricant.
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP32571492A JP3225649B2 (en) | 1992-12-04 | 1992-12-04 | Wear resistant iron-based sintered alloy |
DE69313253T DE69313253T3 (en) | 1992-11-27 | 1993-11-29 | Iron alloy powder for sintering, sintered iron alloy with abrasion resistance and process for producing the same |
US08/158,313 US5512080A (en) | 1992-11-27 | 1993-11-29 | Fe-based alloy powder adapted for sintering, Fe-based sintered alloy having wear resistance, and process for producing the same |
EP93119229A EP0604773B2 (en) | 1992-11-27 | 1993-11-29 | Fe-based alloy powder adapted for sintering, Fe-based sintered alloy having wear resistance, and process for producing the same |
US08/429,827 US5503654A (en) | 1992-11-27 | 1995-04-27 | Fe-based alloy powder and adapted for sintering, Fe-based sintered alloy having wear resistance, and process for producing the same |
US08/429,846 US5489324A (en) | 1992-11-27 | 1995-04-27 | Fe-based sintered alloy having wear resistance |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP32571492A JP3225649B2 (en) | 1992-12-04 | 1992-12-04 | Wear resistant iron-based sintered alloy |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH06172942A JPH06172942A (en) | 1994-06-21 |
JP3225649B2 true JP3225649B2 (en) | 2001-11-05 |
Family
ID=18179878
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Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP32571492A Expired - Fee Related JP3225649B2 (en) | 1992-11-27 | 1992-12-04 | Wear resistant iron-based sintered alloy |
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Country | Link |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102094146A (en) * | 2010-12-03 | 2011-06-15 | 无锡润鹏复合新材料有限公司 | Novel high-temperature resistant self-lubricating sliding bearing material and preparation method thereof |
CN105344992A (en) * | 2015-11-19 | 2016-02-24 | 苏州紫光伟业激光科技有限公司 | Metallurgy powder composition |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5649830B2 (en) * | 2010-02-23 | 2015-01-07 | 株式会社リケン | Valve seat |
CN102965590B (en) * | 2012-11-20 | 2015-12-09 | 江苏高博智融科技有限公司 | A kind of brazing and preparation thereof |
JP7085661B1 (en) * | 2021-03-03 | 2022-06-16 | 株式会社リケン | Valve seat made of iron-based sintered alloy |
-
1992
- 1992-12-04 JP JP32571492A patent/JP3225649B2/en not_active Expired - Fee Related
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102094146A (en) * | 2010-12-03 | 2011-06-15 | 无锡润鹏复合新材料有限公司 | Novel high-temperature resistant self-lubricating sliding bearing material and preparation method thereof |
CN102094146B (en) * | 2010-12-03 | 2013-06-26 | 无锡润鹏复合新材料有限公司 | Novel high-temperature resistant self-lubricating sliding bearing material and preparation method thereof |
CN105344992A (en) * | 2015-11-19 | 2016-02-24 | 苏州紫光伟业激光科技有限公司 | Metallurgy powder composition |
Also Published As
Publication number | Publication date |
---|---|
JPH06172942A (en) | 1994-06-21 |
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