JPH0339402A - Manufacture of metal powder sintered body - Google Patents
Manufacture of metal powder sintered bodyInfo
- Publication number
- JPH0339402A JPH0339402A JP17420789A JP17420789A JPH0339402A JP H0339402 A JPH0339402 A JP H0339402A JP 17420789 A JP17420789 A JP 17420789A JP 17420789 A JP17420789 A JP 17420789A JP H0339402 A JPH0339402 A JP H0339402A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- metal powder
- sintered body
- oxygen
- raw material
- 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
- 239000000843 powder Substances 0.000 title claims abstract description 42
- 239000002184 metal Substances 0.000 title claims abstract description 22
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 17
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 15
- 239000001301 oxygen Substances 0.000 claims abstract description 15
- 238000001746 injection moulding Methods 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract description 9
- 239000011230 binding agent Substances 0.000 claims abstract description 6
- 239000012298 atmosphere Substances 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims abstract description 5
- 230000001590 oxidative effect Effects 0.000 claims abstract description 5
- 229920001169 thermoplastic Polymers 0.000 claims abstract description 5
- 239000004416 thermosoftening plastic Substances 0.000 claims abstract description 5
- 239000011812 mixed powder Substances 0.000 claims abstract description 3
- 238000000465 moulding Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 9
- 238000005245 sintering Methods 0.000 abstract description 9
- 229910002804 graphite Inorganic materials 0.000 abstract description 7
- 239000010439 graphite Substances 0.000 abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 5
- 229910000851 Alloy steel Inorganic materials 0.000 abstract description 3
- 229910052799 carbon Inorganic materials 0.000 abstract description 3
- 238000005238 degreasing Methods 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 238000004663 powder metallurgy Methods 0.000 description 6
- 238000006722 reduction reaction Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 5
- 229910001111 Fine metal Inorganic materials 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000011049 filling Methods 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000009692 water atomization Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は射出成形を利用した金属粉末焼結体の製造方法
に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for manufacturing a metal powder sintered body using injection molding.
通常の粉末冶金法は金属粉末に粉末の充填性を向上させ
る目的で僅かのバインダーを添加してなるものをプレス
成形し、真空中あるいは非酸化性雰囲気中にて焼結して
目的の素材あるいは部品を製造する方法である。このプ
レス成形粉末冶金法では使用する金属粉末の粒径が制限
され、微細な粉末は充填性が悪いので使用することがで
きない。そのため、焼結時に金属粉末の緻密化が充分で
なく一般的に機械的性質が劣る。また金属粉末を直接金
型中にてプレス成形するために製品の形状にも制限があ
り、あ筐り複雑なものの製造は困難であるという欠点も
ある。In the normal powder metallurgy method, metal powder is press-molded with a small amount of binder added to improve the filling properties of the powder, and then sintered in a vacuum or non-oxidizing atmosphere to form the desired material or material. It is a method of manufacturing parts. In this press molding powder metallurgy method, the particle size of the metal powder used is limited, and fine powder cannot be used because it has poor filling properties. Therefore, the metal powder is not sufficiently densified during sintering, and mechanical properties are generally inferior. In addition, since the metal powder is directly press-molded in a mold, there are restrictions on the shape of the product, and it is difficult to manufacture products with complicated housings.
これに対して、金属粉末に熱可塑性のバインダーを配合
してスラリー化したものを金型中へ押出し成形する射出
成形法は微細な金属粉末を使用できるので焼結時に緻密
化し良好な機械的性質を得ることができ、ｌた複雑形状
の品物の製造も可能で有るという特徴を有している。On the other hand, the injection molding method, in which a slurry of metal powder mixed with a thermoplastic binder is extruded into a mold, can use fine metal powder, which becomes dense during sintering and has good mechanical properties. It has the characteristics that it is possible to obtain products with complex shapes.
射出成形を利用した粉末冶金法すなわち射出成形粉末冶
金法は微細な金属粉末を使用できる特徴を有している反
面、以下のような問題点も併せもっている。Although the powder metallurgy method using injection molding, that is, the injection molding powder metallurgy method, has the feature of being able to use fine metal powder, it also has the following problems.
平均粒径が１０μｍ程度の微細金属粉末は一般に水アト
マイズ法にて製造されるために製造時に酸化され、粒径
が小さい程比表面積が大きいので酸化の程度が大きくな
る。そのため、従来の射出成形粉末冶金では、鉄粉を例
にとって説明すると素材粉末としてカーボニル鉄粉ある
いはステンレス鋼粉末が使用され、特に高強度等が要求
される機械部品等の製造には酸化されやすい低炭素、低
合金鋼の水アトマイズ微粉末を使用することは困難であ
る。Fine metal powder with an average particle diameter of about 10 μm is generally produced by a water atomization method and is therefore oxidized during production, and the smaller the particle diameter, the greater the specific surface area and therefore the greater the degree of oxidation. Therefore, in conventional injection molding powder metallurgy, carbonyl iron powder or stainless steel powder is used as the raw material powder, taking iron powder as an example. It is difficult to use water atomized fine powder of carbon and low alloy steel.
本発明は上記技術水準に鑑み、酸化されやすい金属粉末
でも射出成形を利用して性能の優れた金属粉末焼結体を
得ることができる方法を提供しようとするものである。In view of the above-mentioned state of the art, the present invention seeks to provide a method for obtaining a metal powder sintered body with excellent performance using injection molding even with metal powder that is easily oxidized.
本発明は金属粉末中の酸素に化学量論的に相当するグラ
ファイト粉末を配合した混合粉末に熱可塑性バインダー
を添加した原料粉末を、射出成形によう成形した後、非
酸化性雰囲気中にて脱脂し、その後真空中で加熱して金
属粉末の還元と焼結を行なうことを特徴とする金属粉末
焼結体の製造方法である。In the present invention, raw material powder is made by adding a thermoplastic binder to a mixed powder containing graphite powder that is stoichiometrically equivalent to oxygen in metal powder, and then molded by injection molding, and then degreased in a non-oxidizing atmosphere. This method of manufacturing a metal powder sintered body is characterized in that the metal powder is reduced and sintered by heating in vacuum.
すなわち、本発明は例えば比較的多量の酸素を含有した
水アトマイズ微粉末に、含有酸素と化学量論的に一致す
る量の炭素粉末（グラファイト粉末）を配合し、真空中
で加熱することによυグラファイトと酸素を反応させて
還元して焼結体中の酸素を除去して所期の目的の金属粉
末焼結体を得る方法である。That is, the present invention, for example, mixes carbon powder (graphite powder) in an amount stoichiometrically equal to the oxygen content into water atomized fine powder containing a relatively large amount of oxygen, and heats the mixture in a vacuum. υ This is a method of reacting graphite with oxygen and reducing it to remove oxygen from the sintered body to obtain the desired metal powder sintered body.
以下に示す化学反応式によう炭素と酸素が反応し、反応
生成物は気体になって、焼結体外へ逸散して還元される
。この反応速度は高温でかつ、００分圧が小さい程大き
く、圧力が１Ｏ−４Ｔｏｒｒ程度では約８００°Ｃ以上
にて反応が進行する。従って真空中にて約８００〜１１
００°Ｃで還元を行ない、その後引続き昇温して１２０
０〜１３００°Ｃにて焼結を行なえば低酸素で緻密な焼
結体、すなわち機械的性質の優れた焼結体を得ることが
できる。Carbon and oxygen react according to the chemical reaction formula shown below, and the reaction product becomes a gas, which escapes to the outside of the sintered body and is reduced. The rate of this reaction increases as the temperature and partial pressure decrease, and at a pressure of about 10-4 Torr, the reaction proceeds at about 800°C or higher. Therefore, approximately 800 to 11
Reduction was carried out at 00°C, and then the temperature was raised to 120°C.
If sintering is performed at 0 to 1300°C, a dense sintered body with low oxygen content, that is, a sintered body with excellent mechanical properties, can be obtained.
Ｃ＋○＝ ｃ ｏ （１）〔
実施例〕
本発明の一実施態様を以下に説明する。第１表に化学組
成、第１図に粒度構成を示す８４５Ｃ相当の水アトマイ
ズ金属粉末に、次式で示す量のグラファイト微粉末（平
均粒径４μｍ）を添加してロッキングミキサーにて３時
間混合し、グラファイト添加量＝Ｑ、４５Ｘ１２／１６
＝Ｏ１４（重量％）（２）
これに変性ワックスと熱可塑性プラヌテイックからなる
バインダーを８重量％配合して加圧ニーダ中でＱ、５詩
間混練した。これを粉砕後、温度約１４０°Ｃ１圧力１
５００〜１８００ｋｇｆ／ｄ２にて射出成形し、更に成
形体を窒素雰囲気中にて圧力８ ｋｇ ｆ ／ ５２、
最高加熱温度６００°Ｃ１最高温度での保持５時間にて
脱脂を行なった。C+○=c o (1) [
Example] One embodiment of the present invention will be described below. To water atomized metal powder equivalent to 845C whose chemical composition is shown in Table 1 and particle size structure shown in Figure 1, fine graphite powder (average particle size 4 μm) in the amount shown by the following formula is added and mixed for 3 hours in a rocking mixer. Graphite addition amount = Q, 45X12/16
=O14 (% by weight) (2) 8% by weight of a binder consisting of modified wax and thermoplastic planutic was blended with this and kneaded in a pressure kneader for 5 hours. After pulverizing this, the temperature is about 140°C, the pressure is 1
Injection molding is performed at 500 to 1800 kgf/d2, and the molded body is further heated at a pressure of 8 kgf/52 in a nitrogen atmosphere.
Degreasing was carried out at a maximum heating temperature of 600°C and holding at the maximum temperature for 5 hours.
第１表 原料粉末の化学組成 （ｗｔ％）これを第２図
に示すヒートパターンで、真空度（圧力）が１０−’
Ｔｏｒｒオーダにて還元及び真空焼結を実施した。第２
図にかいて１０００ ’Ｃで２時間保持したのは、焼結
が進行して緻密化する以前に還元反応を促進するためで
ある。Table 1 Chemical composition of raw material powder (wt%) This is shown in the heat pattern shown in Figure 2 at a vacuum degree (pressure) of 10-'
Reduction and vacuum sintering were performed at Torr order. Second
The reason why the temperature was maintained at 1000'C for 2 hours as shown in the figure is to promote the reduction reaction before sintering progresses and becomes densified.
真空焼結後の化学組成は第２表に示すとかりてあシ、原
料粉末中の酸素の９９．２％カニ除去されてｈ５．グラ
ファイトを配合して真空中で加熱することによυ充分な
還元が行なわれていることが判る。また、との巣作での
焼結体の相対密度は約９７％であり、機械的性質はグラ
ファイトを添加しない場合に比較して、引張強さは約１
．５倍、伸びは２．３倍に向上し、特に酸素を低減する
ことにより材料の靭性が向上することが判明した。The chemical composition after vacuum sintering is shown in Table 2. After 99.2% of the oxygen in the raw material powder has been removed, the chemical composition is as shown in Table 2. It can be seen that sufficient reduction is achieved by blending graphite and heating in vacuum. In addition, the relative density of the sintered body made with graphite is about 97%, and the tensile strength is about 1% compared to the case where no graphite is added.
．． It was found that the toughness of the material was improved by 5 times, and the elongation was improved by 2.3 times, especially by reducing oxygen.
第２表 グラファイト添加還元・焼結後の化学紙ｅ、（
ｗｔ％）以上、本発明につき特殊な実施例によって本発
明を説明したが、本発明は鉄粉焼結体の製造ばかうでな
く、他の金属粉末焼結体の製造にも適用しうるものであ
る。Table 2 Chemical paper e after graphite addition reduction and sintering (
wt%) The present invention has been described above with reference to specific examples, but the present invention can be applied not only to the production of iron powder sintered bodies but also to the production of other metal powder sintered bodies. It is.
本発明により以下の効果が発揮される。 The present invention exhibits the following effects.
（１）例えば、比較的酸素含有量の多い低炭素、低合金
鋼の水アトマイズ微粉末が使用できる。(1) For example, water atomized fine powder of low carbon, low alloy steel with a relatively high oxygen content can be used.
この結果、任意の組成の焼結体を射出成形粉末冶金法に
て製造可能である。As a result, a sintered body of any composition can be manufactured by injection molding powder metallurgy.
（２）焼結体中の酸素量が低減し、材料の機械的性質が
著しく向上する。(2) The amount of oxygen in the sintered body is reduced, and the mechanical properties of the material are significantly improved.
（３）比較的低置な水アトマイズ粉末を使用できるため
製造コストが低下する。(3) Production costs are reduced because water atomized powder can be used at a relatively low location.
第１図は本発明の実施例にかいて使用する原料粉末の粒
度分布を示す図表、第２図は本発明の実施例にかいて採
用した還元、焼結時のヒートパターンを示す図表である
。Fig. 1 is a chart showing the particle size distribution of the raw material powder used in the embodiment of the present invention, and Fig. 2 is a chart showing the heat pattern during reduction and sintering employed in the embodiment of the present invention. .
Claims (1)
粉末を配合した混合粉末に熱可塑性バインダーを添加し
た原料粉末を、射出成形により成形した後、非酸化性雰
囲気中にて脱脂し、その後真空中で加熱して金属粉末の
還元と焼結を行なうことを特徴とする金属粉末焼結体の
製造方法。The raw material powder is made by adding a thermoplastic binder to a mixed powder containing graphite powder that is stoichiometrically equivalent to the oxygen in the metal powder. After molding by injection molding, it is degreased in a non-oxidizing atmosphere, and then vacuum molded. A method for producing a metal powder sintered body, which comprises heating the metal powder inside to reduce and sinter the metal powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17420789A JPH0339402A (en) | 1989-07-07 | 1989-07-07 | Manufacture of metal powder sintered body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17420789A JPH0339402A (en) | 1989-07-07 | 1989-07-07 | Manufacture of metal powder sintered body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0339402A true JPH0339402A (en) | 1991-02-20 |
Family
ID=15974598
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17420789A Pending JPH0339402A (en) | 1989-07-07 | 1989-07-07 | Manufacture of metal powder sintered body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0339402A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013109531A (en) * | 2011-11-18 | 2013-06-06 | Fujitsu Fip Corp | Apparatus and program for nutrition management |
| CN105251998A (en) * | 2015-11-04 | 2016-01-20 | 深圳艾利门特科技有限公司 | Sintering method for controlling carbon and oxygen content of powder metallurgy products |
| CN106825559A (en) * | 2017-01-07 | 2017-06-13 | 东莞易力禾电子有限公司 | resistor copper electrode sintering process |
-
1989
- 1989-07-07 JP JP17420789A patent/JPH0339402A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013109531A (en) * | 2011-11-18 | 2013-06-06 | Fujitsu Fip Corp | Apparatus and program for nutrition management |
| CN105251998A (en) * | 2015-11-04 | 2016-01-20 | 深圳艾利门特科技有限公司 | Sintering method for controlling carbon and oxygen content of powder metallurgy products |
| CN106825559A (en) * | 2017-01-07 | 2017-06-13 | 东莞易力禾电子有限公司 | resistor copper electrode sintering process |
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