JPH01104701A - Steel powder having excellent compressibility - Google Patents
Steel powder having excellent compressibilityInfo
- Publication number
- JPH01104701A JPH01104701A JP62258355A JP25835587A JPH01104701A JP H01104701 A JPH01104701 A JP H01104701A JP 62258355 A JP62258355 A JP 62258355A JP 25835587 A JP25835587 A JP 25835587A JP H01104701 A JPH01104701 A JP H01104701A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- iron powder
- uncomposite
- steel
- alloy
- 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.)
- Granted
Links
- 239000000843 powder Substances 0.000 title claims abstract description 58
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 29
- 239000010959 steel Substances 0.000 title claims abstract description 29
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 61
- 238000005275 alloying Methods 0.000 claims abstract description 25
- 239000002131 composite material Substances 0.000 claims abstract description 14
- 238000009792 diffusion process Methods 0.000 claims description 15
- 239000002245 particle Substances 0.000 claims description 13
- 238000011282 treatment Methods 0.000 claims description 6
- 229910045601 alloy Inorganic materials 0.000 abstract description 14
- 239000000956 alloy Substances 0.000 abstract description 14
- 239000000203 mixture Substances 0.000 abstract description 5
- 238000007873 sieving Methods 0.000 abstract description 3
- 239000002994 raw material Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 9
- 229910000851 Alloy steel Inorganic materials 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000005245 sintering Methods 0.000 description 4
- BERDEBHAJNAUOM-UHFFFAOYSA-N copper(I) oxide Inorganic materials [Cu]O[Cu] BERDEBHAJNAUOM-UHFFFAOYSA-N 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 240000005979 Hordeum vulgare Species 0.000 description 1
- 235000007340 Hordeum vulgare Nutrition 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- KRFJLUBVMFXRPN-UHFFFAOYSA-N cuprous oxide Chemical compound [O-2].[Cu+].[Cu+] KRFJLUBVMFXRPN-UHFFFAOYSA-N 0.000 description 1
- 229940112669 cuprous oxide Drugs 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010191 image analysis Methods 0.000 description 1
- 239000000463 material 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
- 239000011812 mixed powder Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 229910052721 tungsten Inorganic materials 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)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、合金元素を鉄粉表面に部分的拡散により結合
させた複合合金鉄粉と未複合合金鉄粉との混合物に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a mixture of composite alloyed iron powder and uncomposite alloyed iron powder in which alloying elements are bonded to the surface of the iron powder by partial diffusion.
自動車部品をはＬめ、鋼粉の焼結によって作られる部品
が様々な分野で使われているが、近年の技術的要請とし
て、如何に高強度で高密度の部品を提供するかが焦点と
なっている。高強度に着目した場合、一般に知られてい
る強化元素を含有させた合金鋼粉は１通常の純鉄粉より
も高水準の機械特性が実現でき、これからの工業的な発
展性を期待されているものである。ｉころが鋼粉中に合
金元素を均一に含有する、いわゆるプリアロイ鋼粉は一
般に鋼粉を硬くし鋼粉の圧縮性が低下してしまうので、
高密度を得るには不利である。−方、純鉄粉と合金元素
粉とを混合して成形し、焼結時に合金させて部品を作成
する混粉法では１合金元素の拡散が不十分で焼結体の強
度向上の面で不満が残る。Parts made by sintering steel powder are used in a variety of fields, including automobile parts, but in recent years, technological demands have focused on how to provide high-strength, high-density parts. It has become. When focusing on high strength, alloyed steel powder containing generally known strengthening elements can achieve a higher level of mechanical properties than ordinary pure iron powder, and is expected to have industrial potential in the future. It is something that exists. The so-called pre-alloyed steel powder, in which rollers uniformly contain alloying elements in the steel powder, generally hardens the steel powder and reduces the compressibility of the steel powder.
This is disadvantageous for obtaining high density. -On the other hand, in the mixed powder method, in which pure iron powder and alloying element powder are mixed and molded, and then alloyed during sintering to create parts, the diffusion of one alloying element is insufficient, making it difficult to improve the strength of the sintered body. I remain dissatisfied.
そこで合金元素を鉄粉表面に拡散処理によって部分的に
合金化させ、複合合金鋼粉として圧縮性と均質性を同時
に満足させる技術が一般化するに至っている。このよう
な複合合金鋼粉を製造するには、鉄粉と実質的に４４Ｂ
ｍ以下の粒度の合金元素となる粉末とを均一に混合し、
加熱してこれらの粉末に拡散による冶金的結合を起こさ
せる。この技術は特公昭４５−９６４９号公報に記載さ
れ、合金元素とし゛てＮｉ、Ｃｕ、Ｍｏなどが選択可能
である。Therefore, a technique has become popular in which alloying elements are partially alloyed by diffusion treatment on the surface of iron powder to create a composite alloy steel powder that satisfies compressibility and homogeneity at the same time. In order to produce such composite alloy steel powder, it is necessary to combine iron powder and substantially 44B
uniformly mixed with a powder serving as an alloying element with a particle size of m or less,
Heating causes these powders to undergo metallurgical bonding by diffusion. This technique is described in Japanese Patent Publication No. 45-9649, and Ni, Cu, Mo, etc. can be selected as alloying elements.
しかし、このような複合合金鋼粉の製造において、部分
的な拡散結合をどの程度にするがが、圧縮性と均質性を
両立させるためのポイントとなる。すなわち、鉄粉と合
金元素とが殆ど冶金結合していないならば、単純な混粉
法と特性上天なるところがなく、強度向上が図れない。However, in the production of such composite alloy steel powder, the degree of partial diffusion bonding is a key point in achieving both compressibility and homogeneity. That is, if there is almost no metallurgical bond between the iron powder and the alloying element, there is no improvement in strength compared to the simple powder mixing method in terms of properties.
他方、拡散が進み過ぎると、鉄粉粒子中に合金元素が均
一に合金化されてしまうので鉄粉が硬くなり、圧縮性が
低下してしまう、従って、各々の鉄粉における合金元素
粉末との結合状態が最適になっていることが望ましい。On the other hand, if the diffusion progresses too much, the alloying elements will be uniformly alloyed in the iron powder particles, making the iron powder hard and reducing its compressibility. It is desirable that the bonding state be optimal.
このような最適状態を実現するには、粒度分布をもった
鉄粉と合金元素を含む粉末とを混合し。To achieve this optimal state, iron powder with a particle size distribution and powder containing alloying elements are mixed.
加熱するだけでは不可能である。This is not possible just by heating.
本発明者らの研究に基づく知見によれば、鉄粉の粒度に
よって加熱時の拡散の進行が異なるから、粗い鉄粉と細
かい鉄粉とで異なった処理を施す必要がある。すなわち
、同一時間加熱すると、粗い鉄粉では合金元素はごく表
面のみに拡散し、鉄粉内部が軟かく保たれていても、細
かい鉄粉粒子では拡散が鉄粉内部まで進んでしまい、プ
リアロイ鋼粉と同様に硬化した粒子となって圧縮性が低
下する。According to the findings based on research by the present inventors, since the progress of diffusion during heating differs depending on the particle size of the iron powder, it is necessary to perform different treatments for coarse iron powder and fine iron powder. In other words, when heated for the same amount of time, alloying elements in coarse iron powder diffuse only to the very surface, and even if the inside of the iron powder is kept soft, in fine iron powder particles, the diffusion progresses to the inside of the iron powder, resulting in pre-alloyed steel. Like powder, it becomes hardened particles and its compressibility decreases.
本発明はこのような従来の複合合金鋼粉に見られる問題
を解決し、圧縮性をより向上させようとするものである
。The present invention aims to solve the problems encountered in conventional composite alloy steel powders and further improve compressibility.
本発明は、合金元素を拡散処理によって鉄粉表面に合金
させた複合合金鉄粉と、未複合合金鉄粉とからなる鋼粉
であって、該鋼粉の粒径が４４ｇｍ以下の微粉の一部ま
たは全部を未複合合金鉄粉とすることにより、該鋼粉の
圧縮性を向上させるもので、該鋼粉の粒径が４４ｇｍ以
下の微粉のうち、３０重量％以上を未複合合金鉄粉とす
ることにより所期の目的を達成し得たものである。The present invention is a steel powder consisting of a composite alloy iron powder in which alloying elements are alloyed on the surface of the iron powder by diffusion treatment, and an uncomposite alloy iron powder, the steel powder having a particle size of 44 gm or less. The compressibility of the steel powder is improved by making part or all of it into uncomposite alloyed iron powder, and 30% by weight or more of the fine powder with a particle size of 44 gm or less is made into uncomposite alloyed iron powder. By doing so, the intended purpose was achieved.
本発明の鋼粉は、例えば原料鉄粉を篩目が４４ｇｍの篩
を用いて篩分け、粗粉または粗粉と一部の微粉との混合
物のみに、通常の方法により合金元素を拡散合金させた
のち、複合合金化された粉末に残余の未複合合金鉄粉を
混合することにより得ることができる。The steel powder of the present invention can be produced by, for example, sieving raw iron powder using a sieve with a sieve mesh size of 44 gm, and diffusion-alloying alloying elements into only the coarse powder or a mixture of the coarse powder and some fine powder by a normal method. Afterwards, it can be obtained by mixing the remaining uncomposite alloyed iron powder with the composite alloyed powder.
本発明の鋼粉は微粉の一部または全部が合金化されてお
らず、軟らかいので圧縮性がよく、圧粉密度の高い焼結
体を得ることができる。In the steel powder of the present invention, part or all of the fine powder is not alloyed and is soft, so it has good compressibility and a sintered body with high green density can be obtained.
未複合合金鉄粉の粒径の上限を４４μｍとした理由は、
未複合合金鉄粉を焼結時に合金元素と拡散合金させ、焼
結体の均質性の低下を防止するためである。The reason why the upper limit of the particle size of uncomposite alloyed iron powder is set to 44 μm is as follows.
This is to prevent the homogeneity of the sintered body from deteriorating by diffusing and alloying the uncomposite alloyed iron powder with alloying elements during sintering.
鋼粉の粒径が４４μｍ以下の微粉のうちの未複合合金鉄
粉の割合を３０重量％以上としたのは、３０重量％未満
では効果が不十分となるからである。The reason why the proportion of uncomposite alloyed iron powder in the fine steel powder having a grain size of 44 μm or less is set to 30% by weight or more is because the effect is insufficient if it is less than 30% by weight.
本発明に用いられる合金元素としては、Ｎｉ。The alloying element used in the present invention is Ni.
Ｃｕ 、 Ｍ ｏ 、 Ｗ 、 Ｓ ｎ等が金属粉末ま
たは化合物の粉末として用いられ、これ等の粉末は粒径
が４４μｍ以上の部分が１０％以下のものが望ましく、
合金元素の含有量は鋼粉全体に対し、何れも０、２〜２
０重量％程度である。Cu, Mo, W, Sn, etc. are used as metal powders or compound powders, and these powders preferably have a particle size of 44 μm or more in a proportion of 10% or less,
The content of alloying elements is 0, 2 to 2, based on the whole steel powder.
It is about 0% by weight.
実施例１
粒径が１８０ｇｍ以下のアトマイズ純鉄粉と、粒径が４
４ＪＬｍ以下の亜酸化銅（Ｃｕ２０）粉末とを準備した
。Example 1 Atomized pure iron powder with a particle size of 180 gm or less and a particle size of 4
Cuprous oxide (Cu20) powder of 4 JLm or less was prepared.
鉄粉を篩目が４４μｍの篩で篩分け、粗粒部分（＋４４
μｍ）と微粒部分（−４４ｇｍ）とに分割した０分割の
割合は＋４４ｐＬｍが７４．７重量％、−４４ルｍが２
５．３重量％であった。The iron powder was sieved through a sieve with a mesh size of 44 μm, and the coarse part (+44
μm) and the fine part (-44gm), the ratio of 0 division is 74.7% by weight for +44pLm and 2% by weight for -44pLm.
It was 5.3% by weight.
次の工程を基本として、未複合合金鉄粉を含み、２重量
％のＣｕを含有する鋼粉を作成した。Steel powder containing uncomposite alloyed iron powder and containing 2% by weight of Cu was produced based on the following process.
工程ＩＨ＋４４μｍ鉄粉７５０ｇと、第１表にＸ゛とし
て示した量の一４４μｍ鉄粉との
混合
工程２二工程ｌによる混合鉄粉とＣｕ２０２２．５ｇと
の混合
工程３：工程２による混合物の拡散処理水素ガス中、７
００℃で１時間
工程４：工程３で生成した複合合金鉄粉と第１表にｙと
して示した量の一４４ＪＬｍ鉄粉との混合
鋼粉Ａ−Ｈについて、
（１） 微粉（−４４ｇ、ｍ）に占める未複合合金鉄
粉の割合
■ 圧縮性
■ 焼結体の寸法精度
を測定した。Step 2: Mixing 750 g of IH+44 μm iron powder with 144 μm iron powder in the amount shown as X in Table 1. Mixing of the mixed iron powder with 2.5 g of Cu20 in Step 2. Step 3: Diffusion of the mixture in Step 2. In treated hydrogen gas, 7
00°C for 1 hour Step 4: Regarding the mixed steel powder A-H of the composite alloy iron powder produced in Step 3 and the amount of 144 JLm iron powder shown as y in Table 1, (1) Fine powder (-44 g, m) Proportion of uncomposite alloyed iron powder ■ Compressibility ■ The dimensional accuracy of the sintered body was measured.
（Ｄについては、鋼粉を４４ｇｍの篩で篩分け、篩下を
樹脂に埋込んだ後、走査型電子顕微鏡（ＥＰＭＡ）でＣ
ｕの分布を観察し、鉄粉のうち、Ｃｕと拡散結合の無い
鉄粉の、観察面上の面積を画像解析装置によって測定し
、観察面上の全鉄粉面積との比から、未複合合金鉄粉の
割合として表示した。(For D, after sieving the steel powder with a 44 gm sieve and embedding the bottom of the sieve in resin, the C
Observe the distribution of u, measure the area of the iron powder on the observation surface of the iron powder that has no diffusion bond with Cu using an image analysis device, and calculate the uncompounded area from the ratio to the total iron powder area on the observation surface. Expressed as a percentage of alloyed iron powder.
■については、ステアリン酸亜鉛を１重量％混合し、成
形圧カフｔ／ｃｒｎ’で、長さ３５ｍｍ、幅１０ｍｍ、
高さ６ｍｍの直方体成形体を各１０個成形し、その密度
を測って平均値を圧粉密度として表示した。Regarding ■, 1% by weight of zinc stearate was mixed, molding pressure cuff t/crn', length 35mm, width 10mm,
Ten rectangular parallelepiped bodies each having a height of 6 mm were molded, and their densities were measured and the average value was expressed as green density.
■については、上記成形体をＨ２ガス中１２００℃で１
時間焼結し、焼結前後の長さ方向の寸法変化を測定し、
その標準偏差を測定した。Regarding (2), the above molded body was heated at 1200°C in H2 gas for 1 hour.
Sinter for a time, measure the dimensional change in the longitudinal direction before and after sintering,
The standard deviation was measured.
一４４ＪＬｍ鉄粉の混合量と測定結果を第１表に示した
。Table 1 shows the amount of 144 JLm iron powder mixed and the measurement results.
上記の試験結果から、４４ｇｍ以下の微粉のうちの未複
合合金鉄粉の割合が３０重量％以上であれば、（鋼粉Ｃ
，Ｄ、Ｅ）、未複合合金鉄粉の割合が３０重量％未猫の
場合（鋼粉Ａ、、Ｂ）よりも顕著な圧縮性向上が見られ
、寸法精度は鋼粉Ａ。From the above test results, if the proportion of uncomposite alloyed iron powder in the fine powder of 44 gm or less is 30% by weight or more, (steel powder C
, D, E), a remarkable improvement in compressibility was observed compared to when the ratio of uncomposite alloyed iron powder was 30% by weight (steel powder A, , B), and the dimensional accuracy was that of steel powder A.
Ｂと同程度であった。It was about the same as B.
実施例２
ベースとした鉄粉は実施例１と同じアトマイズ鉄粉であ
り、工程も実施例１と同様とした。−ただし、工程２に
ついてはＣｕ２Ｏ２２，５ｇの代りに第２表に記載の合
金元素を最終組成に適合する量だけ用いた。また工程３
での拡散処理温度と時間は、それぞれの試料について第
２表に記載の通りとした。Example 2 The base iron powder was the same atomized iron powder as in Example 1, and the process was also the same as in Example 1. -However, for step 2, instead of 2.5 g of Cu2O2, alloying elements listed in Table 2 were used in amounts compatible with the final composition. Also process 3
The diffusion treatment temperature and time for each sample were as described in Table 2.
実験結果を第２表に示した。The experimental results are shown in Table 2.
なお、合金元素の種類、含有量および試薬、ならびに拡
散処理を同一とした、従来の拡散合金法による複合合金
鋼粉に対する測定値を比較例として第２表に併記した。Table 2 also shows, as a comparative example, the measured values for composite alloy steel powder using the conventional diffusion alloying method, in which the type, content and reagent of alloying elements, and diffusion treatment were the same.
本発明により、多種類の合金元麦において圧粉密度を向
上させることができた。EFFECT OF THE INVENTION According to the present invention, it was possible to improve the green density of various types of alloying barley.
本発明によれば、従来の複合合金鋼粉の均質性を損なう
ことなく、圧縮性を向上させることができ、高密度材料
の製造が容易となるとともに、同一成形密度とするのに
低い成形圧力が使用でき、金型摩耗を低減して部品製造
費用を節減することができる。According to the present invention, the compressibility can be improved without impairing the homogeneity of conventional composite alloy steel powder, making it easier to manufacture high-density materials, and reducing the compacting pressure to achieve the same compacting density. can be used to reduce mold wear and reduce component manufacturing costs.
Claims (1)
複合合金鉄粉と、未複合合金鉄粉とからなる鋼粉であっ
て、該鋼粉の粒径が４４μｍ以下の微粉のうち、３０重
量％以上が未複合合金鉄粉であることを特徴とする圧縮
性に優れる鋼粉。1 Steel powder consisting of composite alloyed iron powder in which alloying elements are alloyed on the surface of the iron powder by diffusion treatment and non-compounded alloyed iron powder, of which the steel powder has a particle size of 44 μm or less, 30% by weight Steel powder with excellent compressibility, characterized in that more than % of the powder is uncomposite alloyed iron powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62258355A JPH075921B2 (en) | 1987-10-15 | 1987-10-15 | Method for producing composite alloy steel powder with excellent compressibility |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62258355A JPH075921B2 (en) | 1987-10-15 | 1987-10-15 | Method for producing composite alloy steel powder with excellent compressibility |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01104701A true JPH01104701A (en) | 1989-04-21 |
| JPH075921B2 JPH075921B2 (en) | 1995-01-25 |
Family
ID=17319080
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62258355A Expired - Lifetime JPH075921B2 (en) | 1987-10-15 | 1987-10-15 | Method for producing composite alloy steel powder with excellent compressibility |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH075921B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010533789A (en) * | 2007-07-17 | 2010-10-28 | ホガナス アクチボラグ （パブル） | Iron-based composite powder |
| WO2018142778A1 (en) * | 2017-02-02 | 2018-08-09 | Ｊｆｅスチール株式会社 | Mixed powder for powder metallurgy, sintered body, and method for producing sintered body |
| KR20190104571A (en) * | 2017-02-02 | 2019-09-10 | 제이에프이 스틸 가부시키가이샤 | Powder powder metallurgical powder, sintered compact, and manufacturing method of the sintered compact |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59145756A (en) * | 1983-02-08 | 1984-08-21 | Hitachi Powdered Metals Co Ltd | Manufacture of sintered alloy for member of control valve mechanism of internal-combustion engine |
-
1987
- 1987-10-15 JP JP62258355A patent/JPH075921B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59145756A (en) * | 1983-02-08 | 1984-08-21 | Hitachi Powdered Metals Co Ltd | Manufacture of sintered alloy for member of control valve mechanism of internal-combustion engine |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010533789A (en) * | 2007-07-17 | 2010-10-28 | ホガナス アクチボラグ （パブル） | Iron-based composite powder |
| WO2018142778A1 (en) * | 2017-02-02 | 2018-08-09 | Ｊｆｅスチール株式会社 | Mixed powder for powder metallurgy, sintered body, and method for producing sintered body |
| JPWO2018142778A1 (en) * | 2017-02-02 | 2019-02-07 | Ｊｆｅスチール株式会社 | Mixed powder for powder metallurgy, sintered body, and method for producing sintered body |
| KR20190104571A (en) * | 2017-02-02 | 2019-09-10 | 제이에프이 스틸 가부시키가이샤 | Powder powder metallurgical powder, sintered compact, and manufacturing method of the sintered compact |
| KR20190104570A (en) * | 2017-02-02 | 2019-09-10 | 제이에프이 스틸 가부시키가이샤 | Powder powder metallurgical powder, sintered compact, and manufacturing method of the sintered compact |
| CN110267754A (en) * | 2017-02-02 | 2019-09-20 | 杰富意钢铁株式会社 | The manufacturing method of powder used in metallurgy mixed powder, sintered body and sintered body |
| US11414731B2 (en) | 2017-02-02 | 2022-08-16 | Jfe Steel Corporation | Mixed powder for powder metallurgy, sintered body, and method for producing sintered body |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH075921B2 (en) | 1995-01-25 |
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