JP3347773B2 - Pure iron powder mixture for powder metallurgy - Google Patents
Pure iron powder mixture for powder metallurgyInfo
- Publication number
- JP3347773B2 JP3347773B2 JP24825492A JP24825492A JP3347773B2 JP 3347773 B2 JP3347773 B2 JP 3347773B2 JP 24825492 A JP24825492 A JP 24825492A JP 24825492 A JP24825492 A JP 24825492A JP 3347773 B2 JP3347773 B2 JP 3347773B2
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- powder
- weight
- pure iron
- iron powder
- content
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
- Powder Metallurgy (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、水を用いた噴霧法によ
り製造される純鉄系の粉末冶金用鉄粉に関するものであ
る。The present invention relates are those which relate to powder metallurgy of iron powder pure iron produced by spraying with water.
【０００２】[0002]
【従来の技術】粉末冶金用に使用されている鉄粉として
は、純鉄粉系と合金鋼粉系の２種類に大別される。純鉄
粉系は若干のＭｎ（通常０．１〜０．５重量％）とＳ
ｉ、Ｃなどを含み残部は鉄である。一方、合金鋼粉系は
Ｎｉ、Ｃｒ、Ｍｏなどをそれぞれ必要量含有したもので
ある。本発明は前者の純鉄粉系に関するものである。2. Description of the Related Art Iron powders used for powder metallurgy are roughly classified into two types: pure iron powders and alloy steel powders. Pure iron powder contains some Mn (usually 0.1-0.5% by weight) and S
The balance is iron, including i and C. On the other hand, the alloy steel powder contains Ni, Cr, Mo and the like in required amounts. The present invention relates to the former pure iron powder system.
【０００３】本発明の純鉄粉系の粉末の用途は、純鉄粉
にＣｕ粉、黒鉛粉などを添加混合し、金型中で圧粉成形
し、通常５．０〜７．２ｇ／ｃｍ3の密度をもった焼結
部品を製造することにある。合金鋼粉を用いる場合に比
べて純鉄粉系粉末を用いる場合は、焼結後の強度はそれ
ほど上がらないが、圧粉成形がより容易で、成形密度を
高くできるのが特徴である。そして、純鉄粉にＣｕ粉、
黒鉛粉などを添加して焼結体の強度を向上させることは
従来より用いられている技術である。その強度は添加し
たＣｕ粉、黒鉛粉量に依存し、要求される強度特性と合
金化に要する費用から選定されている。The use of the pure iron powder of the present invention is as follows: pure iron powder is mixed with Cu powder, graphite powder and the like, and the mixture is compacted in a mold, usually at 5.0 to 7.2 g / cm. To produce sintered parts with a density of 3 . When a pure iron powder-based powder is used as compared with the case where an alloy steel powder is used, the strength after sintering is not so high, but it is characterized in that the compacting is easier and the compacting density can be increased. And Cu powder to pure iron powder,
Improving the strength of a sintered body by adding graphite powder or the like is a conventionally used technique. The strength depends on the amount of the added Cu powder and graphite powder, and is selected from the required strength characteristics and the cost required for alloying.
【０００４】[0004]
【発明が解決しようとする課題】合金組成を変えずに、
これらの焼結体の強度をさらに高めるためには、成形密
度を高め最終焼結密度を高めたり、焼結温度を高め鉄粉
粒子間の結合を強化したり、添加合金成分の鉄粉粒子中
への拡散を充分に行わせる方法がある。しかし、同一成
形圧力での成形密度は鉄粉本来の圧縮性から制限され、
また成形圧力の増加は成形後の金型からの抜出力の増加
や金型寿命の低下を招くという問題があった。SUMMARY OF THE INVENTION Without changing the alloy composition,
In order to further increase the strength of these sintered bodies, the molding density is increased to increase the final sintering density, the sintering temperature is increased to strengthen the bond between the iron powder particles, There is a method to make the diffusion to the sufficient. However, the molding density at the same molding pressure is limited by the inherent compressibility of iron powder,
Further, there is a problem that an increase in molding pressure causes an increase in ejection force from a mold after molding and a decrease in mold life.
【０００５】さらに、焼結温度の上昇は高温焼結炉の設
置、焼結炉体の寿命低下や焼結コストの上昇などをまね
き、焼結時の経済的負担が増加する。本発明の目的は、
上述したような純鉄粉の特徴を持つと同時に、成形、焼
結条件の変更なく、かつ特殊な合金成分の新たなる追加
も要することなく、純鉄粉焼結体強度の向上を得ること
である。Further, an increase in the sintering temperature leads to the installation of a high-temperature sintering furnace, a reduction in the life of the sintering furnace body, an increase in sintering cost, and the like, and an economic burden during sintering increases. The object of the present invention is
While having the characteristics of pure iron powder as described above, it is possible to improve the strength of the pure iron powder sintered body without changing the forming and sintering conditions, and without requiring a new addition of a special alloy component. is there.
【０００６】[0006]
【課題を解決するための手段】本発明は、Ｓｉ含有量
０．００８重量％未満、Ｍｎ含有量０．０１重量％以上
０．３０重量％以下、かつ酸素含有量０．１５重量％以
下で、残部がＦｅと不可避的不純物である、水を用いた
噴霧法により製造される粉末冶金用純鉄粉と、少なくと
も黒鉛０．９〜１．０重量％を含有することを特徴とす
る粉末冶金用純鉄粉混合物である。SUMMARY OF THE INVENTION The present invention relates to a method for manufacturing a semiconductor device having a Si content of less than 0.008% by weight, a Mn content of 0.01% to 0.30% by weight, and an oxygen content of 0.15% by weight or less. , the balance being Fe and unavoidable impurities, and for powder metallurgy pure iron powder produced by spraying with water, little if
Also contains 0.9 to 1.0% by weight of graphite.
It is a pure iron powder mixture for powder metallurgy .
【０００７】[0007]
【作用】発明者らは上述したような成形、焼結条件の変
更なく、かつ特殊な合金成分のあらたな追加を要するこ
となく、高い強度が得られ、しかも純鉄粉の特徴を有す
る鉄粉を製造することを目的に、鋭意研究した結果、表
１に示すように、鉄粉中のＳｉ含有量を低減することに
より、ある黒鉛添加量以上で強度が急激に向上すること
見出した。The present inventors have obtained iron powder having high strength without changing the molding and sintering conditions as described above, and without requiring a new addition of a special alloy component, and having the characteristics of pure iron powder. As a result of intensive studies for the purpose of producing a steel powder, as shown in Table 1, it was found that, by reducing the Si content in the iron powder, the strength was sharply improved at a certain graphite addition amount or more.
【０００８】[0008]
【表１】 [Table 1]
【０００９】従来、鉄中の不純物元素は非金属介在物と
なった場合、その増加により鉄中Ｃ量に関係なく焼結体
強さを低下させることが知られているが、本知見では特
定の添加黒鉛量以上でＳｉ含有量低減の効果が得られて
いる。このことから、粉末冶金用純鉄粉におけるＳｉ含
有量低減の効果は、従来知られている非金属介在物低減
の効果と全く異なる効果であることが分かった。Conventionally, it has been known that when an impurity element in iron becomes a nonmetallic inclusion, the strength of the sintered body is reduced irrespective of the amount of C in the iron due to its increase. The effect of reducing the Si content is obtained with the amount of graphite added or more. From this, it was found that the effect of reducing the Si content in the pure iron powder for powder metallurgy was a completely different effect from the conventionally known effect of reducing nonmetallic inclusions.
【００１０】そして本発明者らは、この知見に基づき、
本発明をなした。次に、本発明において鋼粉の成分を規
定した理由を述べる。Ｓｉ含有量を０．００８重量％未
満に限定した理由は、Ｓｉ含有量を０．００８重量％以
上にすると、黒鉛添加量を高くしても圧環強度の十分な
上昇が得られないからである。Ｍｎ含有量を０．０１重
量％以上に限定した理由は、鉄粉の通常の工業的製造工
程においてＭｎは不純物元素として入りうる元素であ
り、その含有量を０．０１重量％未満に低減すること
は、比較的困難でその達成には鉄粉製造コストの上昇を
伴うため実用的でないからである。Then, based on this finding, the present inventors
The present invention has been made. Next, the reason for defining the components of the steel powder in the present invention will be described. The reason for limiting the Si content to less than 0.008% by weight is that if the Si content is 0.008% by weight or more, sufficient increase in radial crushing strength cannot be obtained even when the amount of graphite added is increased. . The reason for limiting the Mn content to 0.01% by weight or more is that Mn is an element that can enter as an impurity element in a normal industrial production process of iron powder, and reduces the content to less than 0.01% by weight. This is because it is relatively difficult, and it is not practical to achieve it because the production cost of iron powder increases.
【００１１】Ｍｎ含有量を０．３０重量％以下に限定し
た理由は、Ｍｎは強度を向上させる元素ではあるが、
０．３０重量％を超えて添加された場合、黒鉛添加量を
高くした場合の圧環強度の上昇がか十分得られないから
である。酸素含有量を０．１５重量％以下に限定した理
由は、０．１５重量％を超えると、黒鉛添加量を高くし
た場合の圧環強度の上昇が十分得られないからである。The reason for limiting the Mn content to 0.30% by weight or less is that Mn is an element for improving strength,
If it exceeds 0.30% by weight, it is not possible to sufficiently increase the radial crushing strength when the amount of graphite is increased. The reason for limiting the oxygen content to 0.15% by weight or less is that if it exceeds 0.15% by weight, the radial crushing strength cannot be sufficiently increased when the amount of graphite added is increased.
【００１２】一方、Ｓｉ含有量が０．００８重量％未
満、Ｍｎ含有量が０．０１重量％以上０．３０重量％以
下で残部がＦｅと不可避的不純物であるような組成を有
した水を用いた噴霧法により製造された原料粉である水
噴霧生粉の乾燥条件について、乾燥雰囲気中の酸素濃度
を７．５体積％以下に限定した理由は、７．５体積％を
超えると、焼鈍後の鉄粉中の酸素含有量が０．１５重量
％を超え、黒鉛添加量を高くした場合のの圧環強度の上
昇が十分得られないためである。On the other hand, water having a composition such that the Si content is less than 0.008% by weight, the Mn content is 0.01% by weight or more and 0.30% by weight or less, and the balance is Fe and inevitable impurities is used. The reason for limiting the oxygen concentration in the dry atmosphere to 7.5% by volume or less with respect to the drying conditions of the water-sprayed raw powder, which is the raw material powder produced by the spraying method used, is that if the concentration exceeds 7.5% by volume, annealing is performed. This is because the subsequent increase in the radial crushing strength when the oxygen content in the iron powder exceeds 0.15% by weight and the amount of graphite added is high cannot be obtained.
【００１３】乾燥雰囲気を窒素雰囲気としたのは、雰囲
気中の酸素濃度の制御が容易で、かつ低温でも水素など
のように爆発の危険性がなく、さらにＡｒに比べ経済的
であるからである。乾燥温度は、１００℃以上、２００
℃以下、乾燥時間は３０分以上、１２０以下であれば充
分である。The reason why the nitrogen atmosphere is used as the dry atmosphere is that the oxygen concentration in the atmosphere can be easily controlled, and there is no danger of explosion even at a low temperature unlike hydrogen, and it is more economical than Ar. . Drying temperature is 100 ° C or more, 200
The drying temperature is not more than 30 minutes and not more than 120 minutes.
【００１４】還元条件は通常の純鉄粉の還元条件で充分
である。以下、本発明を実施例に基づいて説明する。As for the reducing conditions, ordinary reducing conditions of pure iron powder are sufficient. Hereinafter, the present invention will be described based on examples.
【００１５】[0015]
【実施例】表２に実施例および比較例に用いた純鉄粉の
化学組成を示す。いずれの鉄粉もＰ、Ｓ含有量は０．０
１重量％、Ａｌは０．０１重量％未満である。EXAMPLES Table 2 shows the chemical compositions of the pure iron powders used in Examples and Comparative Examples. Each iron powder has a P and S content of 0.0
1% by weight, Al is less than 0.01% by weight.
【００１６】[0016]
【表２】 [Table 2]
【００１７】これらの鉄粉は、溶鋼を水噴霧した生粉を
種々の酸素濃度の窒素雰囲気中で１４０°で６０分乾燥
した後、純水素雰囲気中９３０°で２０分還元したの
ち、粉砕分級して製造された。圧環強度は鈍鉄粉に、銅
粉を２重量％、黒鉛粉を０．６および１．０重量％の２
種類、潤滑剤であるステアリン酸亜鉛を１重量％を添加
混合し、密度が６．８０ｇ／ｃｍ3 となるよう圧粉成形
した外径３８ｍｍ、内径２５ｍｍ、高さ１０ｍｍのリン
グ状試験片を、ＣＯ2 含有量０．３％のＲＸガス中で１
１３０℃×２０ｍｉｎ焼結した試験片を用いて測定し
た。These iron powders are obtained by drying raw powder obtained by spraying molten steel with water at 140 ° for 60 minutes in a nitrogen atmosphere having various oxygen concentrations, reducing the powder in a pure hydrogen atmosphere at 930 ° for 20 minutes, and then pulverizing and classifying. It was manufactured. The radial crushing strength is 2% by weight of copper powder and 0.6 and 1.0 % by weight of graphite powder to dull iron powder.
A ring-shaped test specimen having an outer diameter of 38 mm, an inner diameter of 25 mm, and a height of 10 mm, obtained by adding and mixing 1% by weight of zinc stearate as a kind and a lubricant and compacting so as to have a density of 6.80 g / cm 3 , 1 in RX gas with 0.3% CO 2 content
The measurement was performed using a test piece sintered at 130 ° C. for 20 minutes.
【００１８】本発明による実施例１〜６は黒鉛添加量
１．０重量％の圧環強度が９００Ｎ／ｍｍ2 以上と高
く、かつ黒鉛添加量０．６重量％の圧環強度に比べ著し
く向上している。しかし、比較例１は、Ｍｎ含有量が
０．３５％と規定上限を越えているため、黒鉛添加量が
１％のときの圧環強度が７００Ｎ／ｍｍ2 と期待よりは
るかに低い。In Examples 1 to 6 according to the present invention, the radial crushing strength of 1.0% by weight of graphite was as high as 900 N / mm 2 or more, and was significantly improved as compared with the radial crushing strength of 0.6% by weight of graphite. I have. However, in Comparative Example 1, since the Mn content exceeds the prescribed upper limit of 0.35%, the radial crushing strength when the graphite addition amount is 1% is 700 N / mm 2, which is far lower than expected.
【００１９】比較例２は、Ｏが０．１８％と本発明の規
定上限を越えているため、比較例１ほどではないが、黒
鉛添加量が１％のときの圧環強度が８２０Ｎ／ｍｍ2 と
期待より低い。比較例３および４は、Ｓｉ含有量が本発
明の上限を越えているため、やはり黒鉛添加量が１％の
ときの圧環強度が期待より低い。さらに黒鉛添加量０．
６重量％の圧環強度も低下している。In Comparative Example 2, since the O content was 0.18%, which exceeds the upper limit of the present invention, although not as large as in Comparative Example 1, the radial crushing strength when the amount of graphite added was 1% was 820 N / mm 2. And lower than expected. In Comparative Examples 3 and 4, since the Si content exceeds the upper limit of the present invention, the radial crushing strength when the amount of graphite added is 1% is also lower than expected. In addition, the amount of graphite added is 0.
The radial crushing strength of 6% by weight is also reduced.
【００２０】以上の結果から、本発明で規定した組成範
囲の水噴霧純鉄粉は黒鉛添加量が高くなった場合に著し
い強度の上昇が得られることは明白である。またこの規
定範囲の組成を得るための水噴霧生粉の乾燥条件を規定
の範囲とすべきことも明らかである。From the above results, it is apparent that the water-sprayed pure iron powder having the composition range specified in the present invention can obtain a remarkable increase in strength when the amount of graphite added is increased. It is also clear that the conditions for drying the water-sprayed raw powder to obtain the composition within the specified range should be within the specified range.
【００２１】[0021]
【発明の効果】本発明の粉末冶金用純鉄粉にCu、黒鉛添
加した混合物は、従来の粉末冶金用純鉄粉にCu、黒鉛添
加した混合物にくらべ、焼結した際に、同一の成型焼結
条件でかつ格別の合金成分を加えることなく、添加黒鉛
量の増加に伴い同一黒鉛量で格段に強度が向上するの
で、高強度の焼結部品の設計、製造が容易となる。According to the present invention, pure iron powder for powder metallurgy of the present invention is added with Cu and graphite.
Compared with the conventional mixture of pure iron powder for powder metallurgy , Cu and graphite were added , the sintered mixture had the same amount of graphite added under the same molding and sintering conditions and without adding any special alloying components. With the increase, the strength is remarkably improved with the same amount of graphite, so that the design and manufacture of a high-strength sintered part becomes easy.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 大村 武雄 千葉県千葉市中央区川崎町１番地 川崎 製鉄株式会社 千葉製鉄所内 (56)参考文献 特開 昭60−56001（ＪＰ，Ａ) 特開 昭54−114467（ＪＰ，Ａ) 特開 昭56−93802（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) B22F 1/00 C22C 33/02 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takeo Omura 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Kawasaki Steel Corporation Chiba Works (56) References JP-A-60-56001 (JP, A) JP-A Sho 54-114467 (JP, A) JP-A-56-93802 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) B22F 1/00 C22C 33/02
Claims (1)
含有量０．０１重量％以上０．３０重量％以下、かつ酸
素含有量０．１５重量％以下で、残部がＦｅと不可避的
不純物である、水を用いた噴霧法により製造される粉末
冶金用純鉄粉と、少なくとも黒鉛０．９〜１．０重量％
を含有することを特徴とする粉末冶金用純鉄粉混合物。1. An Si content of less than 0.008% by weight, Mn
Content 0.01 wt% 0.30 wt% or less, and an oxygen content of 0.15 wt% or less, the balance being Fe and unavoidable impurities, powder metallurgy produced by atomization using water Pure iron powder and at least 0.9 to 1.0% by weight of graphite
A pure iron powder mixture for powder metallurgy, comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24825492A JP3347773B2 (en) | 1992-09-17 | 1992-09-17 | Pure iron powder mixture for powder metallurgy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24825492A JP3347773B2 (en) | 1992-09-17 | 1992-09-17 | Pure iron powder mixture for powder metallurgy |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06100902A JPH06100902A (en) | 1994-04-12 |
| JP3347773B2 true JP3347773B2 (en) | 2002-11-20 |
Family
ID=17175437
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24825492A Expired - Fee Related JP3347773B2 (en) | 1992-09-17 | 1992-09-17 | Pure iron powder mixture for powder metallurgy |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3347773B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3588174T2 (en) * | 1984-07-23 | 1998-06-10 | Texas Instruments Inc | Video system |
| JP6490259B2 (en) * | 2017-09-04 | 2019-03-27 | Ｄｏｗａエレクトロニクス株式会社 | Method for producing Fe powder or alloy powder containing Fe |
-
1992
- 1992-09-17 JP JP24825492A patent/JP3347773B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06100902A (en) | 1994-04-12 |
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