JP3246211B2 - Abrasion-resistant free graphite-precipitated iron-based sintered material with excellent seizure resistance - Google Patents
Abrasion-resistant free graphite-precipitated iron-based sintered material with excellent seizure resistanceInfo
- Publication number
- JP3246211B2 JP3246211B2 JP19592094A JP19592094A JP3246211B2 JP 3246211 B2 JP3246211 B2 JP 3246211B2 JP 19592094 A JP19592094 A JP 19592094A JP 19592094 A JP19592094 A JP 19592094A JP 3246211 B2 JP3246211 B2 JP 3246211B2
- Authority
- JP
- Japan
- Prior art keywords
- free graphite
- based sintered
- sintered material
- seizure resistance
- graphite
- 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 36
- 239000000463 material Substances 0.000 title claims description 27
- 229910052742 iron Inorganic materials 0.000 title claims description 16
- 238000005299 abrasion Methods 0.000 title claims 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 23
- 239000010439 graphite Substances 0.000 claims description 20
- 229910002804 graphite Inorganic materials 0.000 claims description 20
- 239000000203 mixture Substances 0.000 claims description 11
- 229910000859 α-Fe Inorganic materials 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 239000000843 powder Substances 0.000 description 11
- 238000005245 sintering Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 239000002994 raw material Substances 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 229910001567 cementite Inorganic materials 0.000 description 2
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000011812 mixed powder Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000001376 precipitating effect Effects 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910001096 P alloy Inorganic materials 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 102200082816 rs34868397 Human genes 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 1
Landscapes
- Powder Metallurgy (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、すぐれた耐焼付性を
有し、例えば各種駆動装置の摺動部品などとして適用し
た場合にすぐれた耐摩耗性を長期に亘って発揮する遊離
黒鉛析出鉄系焼結材料に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has excellent seizure resistance and, for example, free graphite-precipitated iron which exhibits excellent wear resistance over a long period of time when applied as a sliding part of various driving devices. It relates to a system-based sintered material.
【０００２】[0002]
【従来の技術】従来、例えば特開昭５７−１６１４８号
公報および特公昭５７−８８６０号公報に記載される通
り、フェライトの素地中に遊離黒鉛が分散分布した組織
を有する遊離黒鉛鉄系焼結材料が知られており、これが
オイルポンプのピストンシリンダや各種軸受などの各種
駆動装置の摺動部品として適用されていることも知られ
ている。また、上記の遊離黒鉛鉄系焼結材料が、所定の
配合組成を有する混合粉末から成形した圧粉体を、還元
性雰囲気中で、原料粉末として配合した黒鉛粉末が素地
に固溶しない低温、すなわち９００〜１０００℃の範囲
内の所定温度で焼結することにより製造されることも知
られている。2. Description of the Related Art Conventionally, as described in, for example, JP-A-57-16148 and JP-B-57-8860, free graphite iron-based sintering having a structure in which free graphite is dispersed and distributed in a ferrite base material. Materials are known, and it is also known that they are applied as sliding parts of various driving devices such as piston cylinders of oil pumps and various bearings. Further, the free graphite iron-based sintered material described above, a green compact formed from a mixed powder having a predetermined compounding composition, in a reducing atmosphere, at a low temperature at which the graphite powder blended as the raw material powder does not form a solid solution, That is, it is also known that it is manufactured by sintering at a predetermined temperature in the range of 900 to 1000 ° C.
【０００３】[0003]
【発明が解決しようとする課題】一方、近年の各種駆動
装置の高出力化および小型化はめざましく、これに伴な
い、これの構造部材である上記摺動部品の使用条件も一
段と厳しさを増す状況にあるが、上記の素地中に相対的
に粗大な未反応残留遊離黒鉛が分散分布した組織を有す
る従来遊離黒鉛鉄系焼結材料は、苛酷な条件下での使用
では焼付けが発生し易く、このような状況では必ずしも
満足な耐摩耗性を示さないのが現状である。On the other hand, in recent years, various types of driving devices have been remarkably increased in output and reduced in size, and accordingly, the use conditions of the above-mentioned sliding parts, which are structural members thereof, have become more severe. Despite the situation, the conventional free graphite iron-based sintered material having a structure in which relatively coarse unreacted residual free graphite is dispersed and distributed in the above-described base material is liable to be baked when used under severe conditions. Under such circumstances, at present, satisfactory wear resistance is not always exhibited.
【０００４】[0004]
【課題を解決するための手段】そこで、本発明者等は、
上述のような観点から、耐焼付性のすぐれた遊離黒鉛鉄
系焼結材料を開発すべく研究を行なった結果、原料粉末
として、基本的にＦｅ−Ｂ−Ｓ合金粉末と黒鉛粉末を用
い、これを所定の配合組成に配合し、混合してなる混合
粉末より成形した圧粉体に、還元性雰囲気中、相対的に
高い焼結温度である１１００〜１２５０℃の範囲内の所
定温度に加熱して黒鉛粉末を前記Ｆｅ−Ｂ−Ｓ合金粉末
中に十分に固溶させ、この状態から望ましくは４０℃／
min.以下の冷却速度で冷却する焼結を施すと、前記Ｂお
よびＳ成分が、素地中に固溶した黒鉛がセメンタイトと
して析出するのを抑制し、一方これが遊離黒鉛として析
出するのを著しく促進するように作用することから、フ
ェライトからなる素地に微細な遊離黒鉛が析出した組織
を有する鉄系焼結材料が得られるようになり、この結果
の遊離黒鉛析出鉄系焼結材料は、すぐれた耐焼付性を示
し、摺動部品として用いた場合に、苛酷な条件下での使
用にも長期に亘ってすぐれた耐摩耗性を示すようになる
という研究結果を得たのである。Means for Solving the Problems Accordingly, the present inventors have
From the above-mentioned viewpoints, as a result of researching to develop a free graphite iron based sintered material having excellent seizure resistance, as a raw material powder, basically, Fe-BS alloy powder and graphite powder were used, This is blended into a prescribed blending composition, and the green compact formed from the mixed powder is heated in a reducing atmosphere to a prescribed temperature within a relatively high sintering temperature range of 1100 to 1250 ° C. Then, the graphite powder is sufficiently dissolved in the Fe-BS-alloy powder, and from this state, desirably 40 ° C /
When sintering is performed at a cooling rate of not more than min., the B and S components suppress the graphite dissolved in the base material from depositing as cementite, while significantly promoting the precipitation as free graphite. As a result, an iron-based sintered material having a structure in which fine free graphite is precipitated on a ferrite matrix can be obtained, and the resulting free graphite-precipitated iron-based sintered material is excellent. Research results show that they exhibit seizure resistance and, when used as sliding parts, exhibit excellent wear resistance over a long period of time even under severe conditions.
【０００５】この発明は、上記の研究結果にもとづいて
なされたものであって、重量％で（以下、％は重量％を
示す）、 Ｃ：０．４〜１％、 Ｓ：０．０２〜０．５％、 Ｂ：０．０１〜０．５％、 を含有し、さらに必要に応じて、 Ｐ：０．０５〜０．６％、 を含有し、残りがＦｅと不可避不純物からなる組成、並
びにフェライトの素地に微細な遊離黒鉛が析出した組織
を有する、耐焼付性のすぐれた耐摩耗性遊離黒鉛析出鉄
系焼結材料に特徴を有するものである。[0005] The present invention has been made based on the above-mentioned research results, and is expressed in terms of% by weight (hereinafter,% indicates% by weight), C: 0.4 to 1%, S: 0.02 to 0.5%, B: 0.01-0.5%, and if necessary, P: 0.05-0.6%, with the balance being Fe and unavoidable impurities In addition, the present invention is characterized by a wear-resistant free graphite-precipitated iron-based sintered material having excellent seizure resistance and having a structure in which fine free graphite is precipitated on a ferrite base material.
【０００６】つぎに、この発明の遊離黒鉛析出鉄系焼結
材料において、成分組成を上記の通りに限定した理由を
説明する。 （ａ） Ｃ Ｃ成分には、ＢおよびＳの共存作用で素地中に微細な遊
離黒鉛として析出して耐焼付性を向上させ、この結果と
してすぐれた耐摩耗性を発揮せしめる作用があるが、そ
の含有量が０．４％未満では遊離黒鉛の析出が不十分で
前記作用に所望の効果が得られず、一方その含有量が１
％を越えると素地にパーライトが形成されるようになっ
て耐焼付性に低下傾向が現われることから、その含有量
を０．４〜１％と定めた。望ましくは０．５〜０．８％
の含有がよい。Next, the reason why the component composition of the free graphite-precipitated iron-based sintered material of the present invention is limited as described above will be described. (A) C The C component has the effect of precipitating as fine free graphite in the base material due to the coexistence of B and S to improve seizure resistance and consequently exhibiting excellent wear resistance. When the content is less than 0.4%, the precipitation of free graphite is insufficient, and the desired effect cannot be obtained in the above-mentioned action.
%, Pearlite is formed on the substrate, and the seizure resistance tends to decrease. Therefore, the content is set to 0.4 to 1%. Desirably 0.5 to 0.8%
Is good.
【０００７】（ｂ） ＳおよびＢ これらの成分には、共存して素地に固溶した黒鉛が冷却
過程でセメンタイトとして析出するのを抑制し、一方微
細な遊離黒鉛として析出するのを促進させる作用があ
り、この場合前記作用を十分に発揮させるには、原料粉
末としてＦｅ中にＢおよびＳを所定量含有させた溶湯か
らアトマイズ法により形成したＦｅ−Ｂ−Ｓ合金粉末を
使用するのが望ましく、したがって、その含有量がＳお
よびＢのいずれかでもＳ：０．０２％未満およびＢ：
０．０１％未満になると前記作用に所望の効果が得られ
ず、一方その含有量がいずれかでもＳ：０．５％および
Ｂ：０．５％を越えると焼結性が阻害され、強度が低下
するようになることから、その含有量をＳ：０．０２〜
０．５％、Ｂ：０．０１〜０．５％と定めた。なお、望
ましくはＳ：０．１〜０．３％、Ｂ：０．０５〜０．２
％の含有がよい。(B) S and B These components coexist to suppress the graphite dissolved as a solid solution in the matrix from precipitating as cementite in the cooling process, while promoting the precipitation as fine free graphite. In this case, in order to sufficiently exert the above-mentioned effect, it is desirable to use Fe-BS alloy powder formed by atomization from a molten metal containing B and S in a predetermined amount in Fe as a raw material powder. Therefore, if the content of either S or B is S: less than 0.02% and B:
If the content is less than 0.01%, the desired effect cannot be obtained, and if the content exceeds any of S: 0.5% and B: 0.5%, the sinterability is impaired, and the strength is reduced. Is reduced, the content is S: 0.02 to
0.5%, B: 0.01 to 0.5%. Preferably, S: 0.1-0.3%, B: 0.05-0.2.
% Is good.
【０００８】（ｃ） Ｐ Ｐ成分には、焼結時に液相を形成して焼結性を向上さ
せ、強度の向上に寄与する作用があるので、必要に応じ
て含有されるが、その含有量が０．０５％未満では所望
の強度向上効果が得られず、一方その含有量が０．６％
を越えると脆化するようになることから、その含有量を
０．０５〜０．６％と定めた。なお、望ましくは０．２
〜０．３％の含有がよい。(C) The PP component has a function of forming a liquid phase at the time of sintering to improve the sinterability and contributing to the improvement of the strength. If the amount is less than 0.05%, a desired strength improving effect cannot be obtained, while the content is 0.6%.
, The content becomes determined to be 0.05 to 0.6%. Preferably, 0.2
-0.3% is good.
【０００９】[0009]
【実施例】ついで、この発明の遊離黒鉛析出鉄系焼結材
料を実施例により具体的に説明する。原料粉末として、
いずれも−３００メッシュの粒度を有するＢおよびＳの
含有量を種々変化せしめた各種のＦｅ−Ｂ−Ｓ合金粉
末、黒鉛粉末、およびＦｅ−Ｐ合金（Ｐ：２７％含有）
粉末を用意し、これら原料粉末を表１に示される配合組
成に配合し、潤滑剤としてステアリン酸亜鉛：０．５％
を加えてＶ型回転混合機中で３０分間混合した後、６to
n ／cm2 の圧力で圧粉体にプレス成形し、ついでメッシ
ュベルト式連続焼結炉にて、吸熱性還元雰囲気中、１１
００〜１２５０℃の範囲内の所定温度に２５分間保持
後、３５℃／min.の冷却速度で室温まで冷却の条件で焼
結することにより、実質的に上記配合組成と同じ成分組
成並びに表１に示される素地組織を有し、かつ外径：１
８mm×内径：８mm×厚さ：１０mmの寸法をもった軸受形
状の本発明遊離黒鉛析出鉄系焼結材料（以下、本発明焼
結材料という）１〜１０および比較遊離黒鉛析出鉄系焼
結材料（以下、比較焼結材料という）１〜４をそれぞれ
製造した。なお、上記比較焼結材料１〜４は、構成成分
のうち遊離黒鉛の析出に影響を及ぼす成分のいずれかの
含有量がこの発明の範囲から外れた組成を有するもので
ある。EXAMPLE Next, the free graphite-precipitated iron-based sintered material of the present invention will be described in detail with reference to examples. As raw material powder,
Various Fe-BS-alloy powders, graphite powders, and Fe-P alloys (P: 27% content) each having variously changed contents of B and S having a particle size of -300 mesh
Powders were prepared, and these raw material powders were blended in the blending composition shown in Table 1, and zinc stearate: 0.5% was used as a lubricant.
And mixed in a V-type rotary mixer for 30 minutes.
n / cm 2 at a pressure of n / cm 2 and then pressed in a mesh belt type continuous sintering furnace in an endothermic reducing atmosphere.
After holding at a predetermined temperature in the range of 00 to 1250 ° C. for 25 minutes, and then sintering at room temperature at a cooling rate of 35 ° C./min., The composition is substantially the same as the above-mentioned composition. And having an outer diameter of 1
Free graphite-precipitated iron-based sintered materials of the present invention 1 to 10 and comparative free graphite-precipitated iron-based sintering in the form of bearings having dimensions of 8 mm x inner diameter: 8 mm x thickness: 10 mm Materials (hereinafter referred to as comparative sintered materials) 1 to 4 were produced, respectively. In addition, the comparative sintered materials 1 to 4 have compositions in which the content of any of the components affecting the precipitation of free graphite is out of the range of the present invention.
【００１０】[0010]
【表１】 [Table 1]
【００１１】つぎに、この結果得られた各種の焼結材料
を軸受として用い、これにＳ４５Ｃの炭素鋼製軸を挿通
し、潤滑油なしの状態で、前記軸を４０００r.p.m.（周
速：１００ｍ／min.）で回転させながら、これに面圧を
漸次増加して行き、軸受に焼付現象が発生した時点の面
圧（焼付荷重）を測定した。この測定結果を表１に示し
た。Next, various sintered materials obtained as a result are used as bearings, and a shaft made of S45C carbon steel is inserted into the bearings, and without lubricating oil, the shaft is rotated at 4000 rpm (peripheral speed: While rotating at 100 m / min.), The surface pressure was gradually increased, and the surface pressure (seizure load) at the time when seizure occurred on the bearing was measured. The measurement results are shown in Table 1.
【００１２】[0012]
【発明の効果】表１に示される結果から、本発明焼結材
料１〜１０は、いずれもフェライト素地に微細な遊離黒
鉛が分散分布した組織を有し、すぐれた耐焼付性を示す
のに対して、比較焼結材料１〜４に見られるように、
Ｃ，Ｓ、およびＢのうちのいずれかの成分含有量（表１
に※印を付す）がこの発明の範囲から外れた組成になる
と耐焼付性に所望の向上効果が得られないことが明らか
である。上述のように、この発明の遊離黒鉛析出鉄系焼
結材料は、例えば各種駆動装置の摺動部品として用いた
場合に、苛酷な条件下でもすぐれた耐焼付性を示し、長
期に亘ってすぐれた耐摩耗性を示すので、これの高出力
化および小型化にも十分満足に対応することができるな
ど工業上有用な特性を有するのである。From the results shown in Table 1, it can be seen that all of the sintered materials 1 to 10 of the present invention have a structure in which fine free graphite is dispersed and distributed in a ferrite base material and exhibit excellent seizure resistance. On the other hand, as seen in the comparative sintered materials 1 to 4,
Content of any one of C, S, and B (Table 1
It is apparent that the desired effect of improving the seizure resistance cannot be obtained if the composition is outside the range of the present invention. As described above, the free graphite-precipitated iron-based sintered material of the present invention exhibits excellent seizure resistance even under severe conditions and is excellent over a long period of time, for example, when used as a sliding part for various driving devices. Because of its high wear resistance, it has industrially useful characteristics such as high output and small size.
フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) C22C 38/00 304 B22F 1/02 C22C 33/02 103 C22C 38/60 Continuation of front page (58) Field surveyed (Int. Cl. 7 , DB name) C22C 38/00 304 B22F 1/02 C22C 33/02 103 C22C 38/60
Claims (2)
びにフェライトの素地に微細な遊離黒鉛が析出した組織
を有することを特徴とする耐焼付性のすぐれた耐摩耗性
遊離黒鉛析出鉄系焼結材料。1. The composition contains, by weight%, C: 0.4 to 1%, S: 0.02 to 0.5%, and B: 0.01 to 0.5%, with the balance being Fe and inevitable impurities. And an abrasion-resistant free graphite-precipitated iron-based sintered material having excellent seizure resistance, characterized by having a composition in which fine free graphite is precipitated on a ferrite base.
びにフェライトの素地に微細な遊離黒鉛が析出した組織
を有することを特徴とする耐焼付性のすぐれた耐摩耗性
遊離黒鉛析出鉄系焼結材料。2. In% by weight, C: 0.4 to 1%, S: 0.02 to 0.5%, B: 0.01 to 0.5%. With excellent balance of seizure resistance, characterized by having a composition of 0.5 to 0.6%, with the balance being Fe and unavoidable impurities, and having a structure in which fine free graphite is precipitated on a ferrite base. Free graphite precipitated iron-based sintered material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19592094A JP3246211B2 (en) | 1994-07-28 | 1994-07-28 | Abrasion-resistant free graphite-precipitated iron-based sintered material with excellent seizure resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19592094A JP3246211B2 (en) | 1994-07-28 | 1994-07-28 | Abrasion-resistant free graphite-precipitated iron-based sintered material with excellent seizure resistance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0841608A JPH0841608A (en) | 1996-02-13 |
| JP3246211B2 true JP3246211B2 (en) | 2002-01-15 |
Family
ID=16349187
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19592094A Expired - Fee Related JP3246211B2 (en) | 1994-07-28 | 1994-07-28 | Abrasion-resistant free graphite-precipitated iron-based sintered material with excellent seizure resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3246211B2 (en) |
-
1994
- 1994-07-28 JP JP19592094A patent/JP3246211B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0841608A (en) | 1996-02-13 |
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