JPH0323272A - Production of powder compact - Google Patents
Production of powder compactInfo
- Publication number
- JPH0323272A JPH0323272A JP1158496A JP15849689A JPH0323272A JP H0323272 A JPH0323272 A JP H0323272A JP 1158496 A JP1158496 A JP 1158496A JP 15849689 A JP15849689 A JP 15849689A JP H0323272 A JPH0323272 A JP H0323272A
- Authority
- JP
- Japan
- Prior art keywords
- compact
- powder
- powder compact
- degreasing
- sintering
- 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 52
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 239000011230 binding agent Substances 0.000 claims abstract description 19
- 238000005245 sintering Methods 0.000 claims abstract description 16
- 239000000919 ceramic Substances 0.000 claims abstract description 6
- 239000002184 metal Substances 0.000 claims abstract description 6
- 229910010272 inorganic material Inorganic materials 0.000 claims description 6
- 239000011147 inorganic material Substances 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 2
- 238000005238 degreasing Methods 0.000 abstract description 23
- 239000000463 material Substances 0.000 abstract description 14
- 238000000034 method Methods 0.000 abstract description 10
- 230000008602 contraction Effects 0.000 abstract 1
- 239000002657 fibrous material Substances 0.000 abstract 1
- 239000000203 mixture Substances 0.000 abstract 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 15
- 229910010271 silicon carbide Inorganic materials 0.000 description 14
- 239000000835 fiber Substances 0.000 description 7
- 238000002347 injection Methods 0.000 description 7
- 239000007924 injection Substances 0.000 description 7
- 230000007547 defect Effects 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 238000001746 injection moulding Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000005237 degreasing agent Methods 0.000 description 2
- 239000013527 degreasing agent Substances 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 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、粉末成形体の製造方法に関し、更に詳しくは
有機結合剤を含む粉末成形体より有機結合剤を除去する
方法及び更に焼結する方法に関するものである。Detailed Description of the Invention [Industrial Application Field] The present invention relates to a method for producing a powder compact, and more specifically, a method for removing an organic binder from a powder compact containing an organic binder, and further sintering. It is about the method.
従来、セラミックス或いは金属粉末の焼結体製造方法に
おいて、射出成形法、押出し成形法等により粉末成形体
を得る場合には、流動性を付与するために多量の有機結
合剤を添加する必要があった。しかし該有機結合剤は焼
結時に粉末戊形体に割れ、膨れ、変形等の欠陥を生じさ
せる。そのため、焼結前にあらかじめ有機結合剤を除去
する脱脂工程が必要である。また、有機結合剤除去のた
めの脱脂も昇温が急激であると前記欠陥を生じるため１
〜１０℃／ｈｒ程度のおだやかな昇温か必要である。近
年、前記欠陥が生ずることなく昇温速度を速めるために
粉末成形体を脱脂温度においても安定な無機粉末に埋設
して、粉末成形体表面から流出する有機結合剤を吸い取
る方法が用いられている。Conventionally, in the production of ceramic or metal powder sintered bodies, when obtaining powder compacts by injection molding, extrusion molding, etc., it is necessary to add a large amount of organic binder to impart fluidity. Ta. However, the organic binder causes defects such as cracking, blistering, and deformation in the powder body during sintering. Therefore, a degreasing step is required to remove the organic binder before sintering. In addition, degreasing to remove organic binders also causes the above-mentioned defects if the temperature rises rapidly.
A gentle temperature increase of about 10° C./hr is required. In recent years, in order to increase the heating rate without causing the above-mentioned defects, a method has been used in which a powder compact is embedded in an inorganic powder that is stable even at the degreasing temperature and the organic binder flowing out from the powder compact surface is absorbed. .
しかしながら、粉末成形体を埋設する無機粉末（以下脱
脂材と記す）の粒径が細かいと製造工程における取扱い
が困難であり、また、脱脂材の粒径が粗いと脱脂材と粉
末成形体の接触面積が小さくなるため脱脂材としての機
能が弱まり、有機結合剤が急激に粉末成形体から抜ける
ため粉末成形体に割れ、膨れ、変形等の欠陥が生じやす
い。また、脱脂材に埋設したまま焼結すると作業能率が
大巾に向上するが、粉末成形体が焼結により収縮した場
合、脱脂材が粉末であるとブリッヂングを起こし、粉末
成形体を完全に保持し得ず、焼結体に変形が生じること
があった。However, if the particle size of the inorganic powder (hereinafter referred to as degreasing material) used to embed the powder compact is small, it is difficult to handle it during the manufacturing process, and if the particle size of the degreasing material is coarse, there may be contact between the degreasing material and the powder compact. Since the area becomes smaller, the function as a degreasing agent is weakened, and the organic binder is rapidly released from the powder compact, which tends to cause defects such as cracking, blistering, and deformation in the powder compact. In addition, sintering while embedded in the degreasing material greatly improves work efficiency, but if the powder compact shrinks due to sintering, bridging will occur if the degreasing material is powder, and the powder compact will not be completely retained. This may cause deformation of the sintered body.
本発明は、上述Ｉ，た問題点を解決するためになされた
ものであり、脱脂材として繊維状無機物を用いることに
より、脱脂性、作業性ともに優れ、脱脂材に埋設したま
ま焼結しても、焼結体に変形を生じさせない粉末成形体
の製造方法を提供することを目的としている。The present invention has been made to solve the above-mentioned problems, and by using a fibrous inorganic material as a degreasing material, it has excellent degreasing properties and workability, and it can be sintered while being embedded in the degreasing material. Another object of the present invention is to provide a method for producing a powder compact that does not cause deformation of the sintered body.
［課題を解決するための手段］
この目的を達成するために本発明の粉末成形体の製造方
広は、脱脂温度或いは焼桔温度においても安定な繊維状
無機物に粉末成形体を埋設して脱脂すること及び更に埋
設状態のままで焼結することを手段としている。[Means for Solving the Problems] In order to achieve this object, the method for producing the powder compact of the present invention involves embedding the powder compact in a fibrous inorganic material that is stable even at the degreasing temperature or the sintering temperature, and degreasing the powder compact. The method is to sinter the material while it is still buried.
［作用］
上記の構戒を有する本発明の繊維状無機物は、粉末に比
べ作業工程において容易に取扱うことができ、また脱脂
にひきつづき焼結に供しても粉末成形体の焼結収縮に追
従して変形し、粉末成形体を完全に保持し得る。[Function] The fibrous inorganic material of the present invention having the above-mentioned structure can be handled more easily in the work process than powder, and also follows the sintering shrinkage of the powder compact even when it is subjected to sintering after degreasing. It can be deformed and completely hold the powder compact.
［実施例コ
以下、本発明を具体化したー実施例を図面を参照して説
明する。[Embodiments] Hereinafter, embodiments embodying the present invention will be described with reference to the drawings.
図面に本発明の一実施例を示す。炭化珪素射出成形体１
を黒鉛容器３に入れられた炭化珪素繊維２に埋設し、こ
れを脱脂炉に挿入しＡｒガス５ｋｇ ／ ｃ ｍ ”の
圧力下で昇温率１０℃／ｈｒで５００℃まで昇温し脱脂
した後、そのまま焼結炉に挿入し、２１００℃Ｘｌｈｒ
で焼結した。得られた炭化珪素焼結体は相対密度９７％
で割れ、膨れ、変形の無い良好なものであった。An embodiment of the present invention is shown in the drawings. Silicon carbide injection molded body 1
was embedded in silicon carbide fiber 2 placed in a graphite container 3, which was inserted into a degreasing furnace and degreased by increasing the temperature to 500°C at a temperature increase rate of 10°C/hr under a pressure of 5 kg/cm'' of Ar gas. After that, insert it into the sintering furnace as it is and heat it at 2100℃Xlhr.
Sintered with The obtained silicon carbide sintered body has a relative density of 97%
It was in good condition with no cracks, bulges, or deformations.
即ち、炭化珪素射出成形体１を炭化珪素繊維２に埋設し
、脱脂することにより粉末を脱脂剤として用いる場合に
比べて作業工程において取扱いの容易な脱脂が可能であ
る。更にそのまま焼結しても炭化珪素射出成形体１の焼
結収縮に炭化珪素繊維２が追従して変形し、常に炭化珪
素射出成形体１を覆うため炭化珪素射出成形体１の自重
に起因するダレ等の変形を防止することができる。That is, by embedding silicon carbide injection molded body 1 in silicon carbide fiber 2 and degreasing it, it is possible to perform degreasing which is easier to handle in the working process than when powder is used as a degreasing agent. Furthermore, even if sintered as is, the silicon carbide fibers 2 follow the sintering shrinkage of the silicon carbide injection molded body 1 and deform, always covering the silicon carbide injection molded body 1, which is caused by the weight of the silicon carbide injection molded body 1. Deformation such as sag can be prevented.
尚、粉末射出成形を構成する粉末は炭化珪素のほか、ア
ルミナ，ジルコニア，窒化珪素等のセラミックス粉末、
あるいは金属粉末を用いることができる。また粉末成形
体の成形方法は射出成形のほか、押出し成形，プレス成
形，鋳込み成形等を用いることができる。また繊維状無
機物は炭化珪素繊維のほか、アルミナ繊維，カーボン繊
維等の繊維や炭化珪素ウィスカー，カーボンウィスカー
等のウィスカーのうち脱脂温度、脱脂雰囲気或いは焼結
温度、焼結雰囲気において粉末成形体と反応しない安定
なものであれば使用することができる。In addition to silicon carbide, the powders used in powder injection molding include ceramic powders such as alumina, zirconia, and silicon nitride.
Alternatively, metal powder can be used. In addition to injection molding, extrusion molding, press molding, casting molding, etc. can be used as a molding method for the powder compact. In addition to silicon carbide fibers, fibrous inorganic substances react with powder compacts at the degreasing temperature, degreasing atmosphere, sintering temperature, and sintering atmosphere among fibers such as alumina fibers and carbon fibers, and whiskers such as silicon carbide whiskers and carbon whiskers. It can be used as long as it is stable.
［発明の効果］
以上詳述したことから明らかなように、本発明によれば
、作業性の優れた脱脂，焼結方法を提供できる。更に粉
末成形体を脱脂材から取り出さず、脱脂，焼結を続けて
行なった場合でも粒末成形体に変形が生じにくい焼結方
法を提供することができる。[Effects of the Invention] As is clear from the detailed description above, according to the present invention, a degreasing and sintering method with excellent workability can be provided. Furthermore, it is possible to provide a sintering method in which deformation of the powder compact is less likely to occur even when the powder compact is continuously degreased and sintered without being removed from the degreasing material.
図面は本発明の一実施例を示す構成図である。
図中、１は炭化珪素射出成形体、２は炭化珪素繊維、３
は黒鉛容器である。The drawing is a configuration diagram showing an embodiment of the present invention. In the figure, 1 is a silicon carbide injection molded product, 2 is a silicon carbide fiber, and 3 is a silicon carbide injection molded product.
is a graphite container.
Claims (2)
形した粉末成形体より、前記有機結合剤を除去する粉末
成形体の製造方法において、前記粉末成形体を繊維状無
機物に埋設した状態で加熱し、前記粉末成形体から前記
有機結合剤を除去することを特徴とする粉末成形体の製
造方法。1. A method for producing a powder compact, in which an organic binder is added to ceramic or metal powder, and the organic binder is removed from a compacted powder compact, which comprises: heating the powder compact while embedded in a fibrous inorganic material; A method for producing a powder compact, comprising removing the organic binder from the powder compact.
形した粉末成形体より、前記有機結合剤を除去する粉末
成形体の製造方法において、前記粉末成形体を繊維状無
機物に埋設した状態で加熱し前記粉末成形体から、前記
有機結合剤を除去し、その後前記繊維状無機物に埋設し
た状態で焼結を行なうことを特徴とする粉末成形体の製
造方法。2. A method for producing a powder compact, in which an organic binder is added to ceramic or metal powder, and the organic binder is removed from the powder compact, which is heated while the powder compact is embedded in a fibrous inorganic material. A method for producing a powder compact, comprising removing the organic binder from the powder compact, and then sintering the organic binder embedded in the fibrous inorganic material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1158496A JPH0323272A (en) | 1989-06-21 | 1989-06-21 | Production of powder compact |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1158496A JPH0323272A (en) | 1989-06-21 | 1989-06-21 | Production of powder compact |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0323272A true JPH0323272A (en) | 1991-01-31 |
Family
ID=15673009
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1158496A Pending JPH0323272A (en) | 1989-06-21 | 1989-06-21 | Production of powder compact |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0323272A (en) |
-
1989
- 1989-06-21 JP JP1158496A patent/JPH0323272A/en active Pending
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