JP3212698B2 - Manufacturing method of cemented carbide parts - Google Patents
Manufacturing method of cemented carbide partsInfo
- Publication number
- JP3212698B2 JP3212698B2 JP18505792A JP18505792A JP3212698B2 JP 3212698 B2 JP3212698 B2 JP 3212698B2 JP 18505792 A JP18505792 A JP 18505792A JP 18505792 A JP18505792 A JP 18505792A JP 3212698 B2 JP3212698 B2 JP 3212698B2
- Authority
- JP
- Japan
- Prior art keywords
- water
- cemented carbide
- degreasing
- organic polymer
- heating
- 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
- 238000004519 manufacturing process Methods 0.000 title claims description 15
- 238000005238 degreasing Methods 0.000 claims description 40
- 239000011230 binding agent Substances 0.000 claims description 39
- 229920000620 organic polymer Polymers 0.000 claims description 34
- 229920001169 thermoplastic Polymers 0.000 claims description 34
- 239000004416 thermosoftening plastic Substances 0.000 claims description 34
- 239000000843 powder Substances 0.000 claims description 33
- 238000010438 heat treatment Methods 0.000 claims description 28
- 238000000034 method Methods 0.000 claims description 25
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 21
- 238000005245 sintering Methods 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 24
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 23
- 229910052799 carbon Inorganic materials 0.000 description 23
- 238000010828 elution Methods 0.000 description 19
- 238000005452 bending Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
- 230000007547 defect Effects 0.000 description 6
- 239000010419 fine particle Substances 0.000 description 6
- 238000001746 injection moulding Methods 0.000 description 6
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 4
- 239000005038 ethylene vinyl acetate Substances 0.000 description 4
- 238000004898 kneading Methods 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 238000010137 moulding (plastic) Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 4
- 230000008961 swelling Effects 0.000 description 4
- 235000021355 Stearic acid Nutrition 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000003657 drainage water Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000000314 lubricant Substances 0.000 description 3
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 3
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 3
- 239000003960 organic solvent Substances 0.000 description 3
- 239000012188 paraffin wax Substances 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- 239000008117 stearic acid Substances 0.000 description 3
- 239000008400 supply water Substances 0.000 description 3
- 239000002202 Polyethylene glycol Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920001223 polyethylene glycol Polymers 0.000 description 2
- 238000005979 thermal decomposition reaction Methods 0.000 description 2
- 238000003809 water extraction Methods 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229920000609 methyl cellulose Polymers 0.000 description 1
- 239000001923 methylcellulose Substances 0.000 description 1
- 235000010981 methylcellulose Nutrition 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920000193 polymethacrylate Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920001289 polyvinyl ether Polymers 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229920003169 water-soluble polymer Polymers 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
Description
【０００１】[0001]
【産業上の利用分野】本発明は、超硬合金製部品を可塑
成形法で製造する技術に関し、特にサブミクロン（１μ
ｍ以下をいう）の、粒子径の細かい超硬合金粉末を使用
する場合にも、焼結体密度が高く、機械的特性に優れ、
かつ均質な焼結体を得ることが可能な、超硬合金製部品
の製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for producing a part made of cemented carbide by a plastic molding method, and more particularly to a technique for manufacturing a submicron (1 .mu.
m or less), even when using a cemented carbide powder with a fine particle size, the sintered body density is high, the mechanical properties are excellent,
The present invention relates to a method for manufacturing a cemented carbide part capable of obtaining a homogeneous sintered body.
【０００２】[0002]
【従来の技術】従来、超硬合金粉末に有機バインダーを
配合して混練し、粉末に流動性を賦与してこれを可塑成
形し、得られる成形体を脱脂・焼結することにより超硬
合金粉末から可塑成形品を製造する方法が知られてい
る。2. Description of the Related Art Conventionally, a cemented carbide is prepared by compounding and kneading an organic binder with cemented carbide powder, imparting fluidity to the powder, plastic-molding the powder, and degreasing and sintering the obtained compact. A method for producing a plastic molded article from powder is known.
【０００３】また、この際行われる成形体の脱脂方法と
して、（イ）成形体を加熱することにより有機バインダ
ーを蒸発・分解させる方法及び（ロ）溶媒を用いて成形
体から有機バインダーを溶出する方法が知られている。[0003] Further, as a method of degreasing the molded body, a method of (a) evaporating and decomposing the organic binder by heating the molded body and (b) eluting the organic binder from the molded body using a solvent are used. Methods are known.
【０００４】しかしながら、（イ）の方法には、成形体
を変形させることなく、また欠陥を生じさせることなく
脱脂するには非常に長時間を要し、また、加熱時に有機
バインダー中の炭素が完全に除去できず、使用する超硬
合金粉末の本来の物性が得られなくなるという問題があ
る。However, in the method (a), it takes a very long time to degrease the molded article without deforming the molded article and without causing defects, and the carbon contained in the organic binder during heating is reduced. There is a problem that it cannot be completely removed, and the original physical properties of the cemented carbide powder used cannot be obtained.
【０００５】即ち、（イ）の方法では、成形体が加熱さ
れることにより軟化し、変形したり、脱脂体を焼結した
焼結体が健全相領域を外れてしまったりする。That is, in the method (a), the molded body is softened and deformed by heating, or the sintered body obtained by sintering the degreased body is out of the sound phase region.
【０００６】これを防止するため、熱分解温度の比較的
低いポリマーを組み合わせた有機バインダーを、変形温
度以下に加熱し、熱変形を起こす前に成形体中に含まれ
る有機バインダーを除去することが考えられる。In order to prevent this, it is necessary to heat an organic binder in which a polymer having a relatively low thermal decomposition temperature is combined to a temperature lower than a deformation temperature, and to remove the organic binder contained in the molded body before causing thermal deformation. Conceivable.
【０００７】しかしながら、変形温度以下で有機バイン
ダーを蒸発・分解して除去するには長時間を要し、しか
もこのように簡単に蒸発・分解できるような有機バイン
ダー組成では、成形時の流動性が不安定となって欠陥が
生じ易くなる。[0007] However, it takes a long time to evaporate and decompose the organic binder at a temperature lower than the deformation temperature, and the organic binder composition which can be easily evaporated and decomposed has a low fluidity during molding. It becomes unstable and defects easily occur.
【０００８】また、（イ）の方法では、脱脂初期に急激
な有機バインダーの蒸発や分解が生じると、成形体に膨
れや亀裂等の欠陥が生じる場合が多く、脱脂時間を長く
したり、脱脂雰囲気を加圧にしたりしなければならない
という問題もある。In the method (a), if the organic binder rapidly evaporates or decomposes in the early stage of degreasing, defects such as swelling and cracks often occur in the molded product, and the degreasing time is prolonged or the degreasing is performed. There is also a problem that the atmosphere must be pressurized.
【０００９】更に、超硬合金粉末は、ステンレス粉末よ
りも比重が重く、加熱による脱脂工程で成形体が軟化
し、修正不能なまでに熱変形を起こす。この熱変形の程
度を小さくするために、非焼結性セラミックス粉末中に
埋め込んで脱脂を行ったり、有機バインダーの量を少な
くすることにより、混練物の可塑成形性を犠牲にして変
形を抑える等の対策も行われているが、この場合には、
成形時の流動性が不安定となり、成形体に欠陥が生じ易
くなる。Further, the cemented carbide powder has a higher specific gravity than the stainless steel powder, so that the compact is softened in the degreasing step by heating and undergoes thermal deformation to the point where it cannot be corrected. In order to reduce the degree of this thermal deformation, it is embedded in non-sinterable ceramic powder and degreased, or by reducing the amount of organic binder, the deformation is suppressed at the expense of plastic moldability of the kneaded material. Measures have been taken, but in this case,
Fluidity during molding becomes unstable, and defects tend to occur in the molded body.
【００１０】一方、（ロ）の方法のように、変形温度以
下の低温において溶媒を用いて、有機バインダーの一部
を溶出除去し、不活性ガス雰囲気下で加熱すると、後の
加熱によっても変形を起こさず、有機バインダーを除去
することができる。On the other hand, as in the method (b), when a part of the organic binder is eluted and removed using a solvent at a low temperature not higher than the deformation temperature and heated in an inert gas atmosphere, the deformation is also caused by the subsequent heating. The organic binder can be removed without causing the occurrence.
【００１１】しかしながら、この（ロ）の方法にも、有
機バインダーの除去のためには有機溶剤を使用する必要
があり、またその有機溶剤が高価であり、有機溶剤の取
り扱いによっては危険を伴うという問題がある。However, in the method (b), it is necessary to use an organic solvent for removing the organic binder, and the organic solvent is expensive, and handling of the organic solvent is dangerous. There's a problem.
【００１２】更に、溶剤として水を使用する方法も考え
られるが、この方法にも、超硬合金粉末が水分を吸収し
易く、かつ水和物を作る際、焼結時に水和物が分解する
ことにより発生する酸素が、超硬合金粉末中の炭素を消
費し、炭素量のコントロールが難しいという問題があ
る。[0012] Further, a method using water as a solvent is also conceivable. In this method, too, the cemented carbide powder easily absorbs water, and when hydrate is formed, the hydrate is decomposed during sintering. The resulting oxygen consumes carbon in the cemented carbide powder, and it is difficult to control the amount of carbon.
【００１３】[0013]
【発明が解決しようとする課題】本発明は、前記従来技
術の有する問題を解決して、短時間の脱脂時間でも成形
体に変形や膨れを起こさず、しかも有機バインダー中の
炭素を完全に除去でき、使用する超硬合金粉末の本来の
物性が損なわれず、０．１〜１μｍの、粒子径の細かい
超硬合金粉末を使用する場合にも、焼結体密度が高く、
機械的特性に優れ、かつ均質な焼結体を得ることが可能
な、超硬合金製部品の製造方法を提供することを目的と
する。DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and does not cause deformation or swelling of a molded product even with a short degreasing time, and completely removes carbon in an organic binder. The original physical properties of the cemented carbide powder to be used are not impaired, and even when using cemented carbide powder with a fine particle diameter of 0.1 to 1 μm, the sintered body density is high,
An object of the present invention is to provide a method for manufacturing a cemented carbide part, which has excellent mechanical properties and can obtain a homogeneous sintered body.
【００１４】[0014]
【課題を解決するための手段】本発明の超硬合金製部品
の製造方法では、超硬合金粉末に少なくとも一種の水不
溶性熱可塑性有機ポリマーを混合して、該超硬合金粉末
の表面が該水不溶性熱可塑性有機ポリマーで被覆された
混練物を得、次いで該混練物に少なくとも一種の水溶性
熱可塑性有機ポリマーを含む有機バインダーを混合して
組成物を得、更に該組成物を可塑成形して成形体とし、
該成形体と水とを接触させて該水溶性熱可塑性有機ポリ
マーを溶出させた後、加熱炉において残りの有機バイン
ダーを加熱脱脂して脱脂体とし、該脱脂体を焼結するこ
とを手段とする。In the method for manufacturing a cemented carbide part according to the present invention, at least one kind of water-insoluble thermoplastic organic polymer is mixed with the cemented carbide powder so that the surface of the cemented carbide powder is Obtaining a kneaded material coated with a water-insoluble thermoplastic organic polymer, then mixing the kneaded material with an organic binder containing at least one water-soluble thermoplastic organic polymer to obtain a composition, and further plastic-molding the composition To form a compact,
Contacting the molded body with water to elute the water-soluble thermoplastic organic polymer, heating the remaining organic binder in a heating furnace to form a degreased body, and sintering the degreased body; I do.
【００１５】この際、加熱脱脂時の雰囲気を水素ガス気
流とすることが好ましい。また、この際、加熱脱脂時の
雰囲気を１００ｔｏｒｒ以下の圧力に保つことが好まし
い。At this time, it is preferable that the atmosphere at the time of heat degreasing is a hydrogen gas stream. At this time, it is preferable to maintain the atmosphere during the heating degreasing at a pressure of 100 torr or less.
【００１６】また、０．１〜１μｍの、粒子径の細かい
超硬合金粉末を使用する場合には、加熱脱脂時の雰囲気
を、水素ガス気流とし、かつ１００ｔｏｒｒ以下の圧力
に保つことが好ましい。When a cemented carbide powder having a fine particle diameter of 0.1 to 1 μm is used, it is preferable that the atmosphere at the time of heating and degreasing be a hydrogen gas stream and maintained at a pressure of 100 torr or less.
【００１７】本発明の超硬合金製部品の製造方法によれ
ば、このように脱脂処理として、成形体と水とを接触さ
せて水溶性熱可塑性有機ポリマーを溶出させた後、好ま
しくは、加熱脱脂時の雰囲気を、水素ガス気流とし、ま
たは１００ｔｏｒｒ以下の圧力に保ち、あるいは水素ガ
ス気流で、かつ１００ｔｏｒｒ以下の圧力に保ち、水不
溶性熱可塑性有機ポリマー等の残りの有機バインダーを
加熱除去し、その後、焼結処理を行うことにより、水抽
出脱脂時において、脱脂体に予め設けられたバインダー
の抜け道から、バインダーの加熱分解、蒸発、あるいは
バインダーと水素ガスの反応により生ずるガスが抜け、
その結果、成形体に変形や膨れを起こさず、脱脂時間を
短くすることができ、しかもバインダー中の炭素を完全
に除去することができる。According to the method for manufacturing a cemented carbide part according to the present invention, the degreasing treatment is carried out after the water-soluble thermoplastic organic polymer is eluted by bringing the molded body into contact with water and then heating. The atmosphere at the time of degreasing is a hydrogen gas stream, or kept at a pressure of 100 torr or less, or a hydrogen gas stream and kept at a pressure of 100 torr or less, and heat-removed the remaining organic binder such as a water-insoluble thermoplastic organic polymer. After that, by performing a sintering process, at the time of water extraction degreasing, a gas generated by the thermal decomposition of the binder, evaporation, or the reaction of the binder and hydrogen gas is released from a binder escape route provided in advance to the degreased body,
As a result, the molded body does not deform or swell, the degreasing time can be shortened, and carbon in the binder can be completely removed.
【００１８】本発明の超硬合金製部品の製造方法を実施
するに際しては、まず、超硬合金粉末に少なくとも一種
の水不溶性熱可塑性有機ポリマーを混合して、超硬合金
粉末の表面が水不溶性熱可塑性有機ポリマーで被覆され
た混練物を得る。In carrying out the method for manufacturing a cemented carbide part according to the present invention, first, at least one kind of water-insoluble thermoplastic organic polymer is mixed with the cemented carbide powder to make the surface of the cemented carbide powder water-insoluble. A kneaded product coated with a thermoplastic organic polymer is obtained.
【００１９】次いでこの混練物に少なくとも一種の水溶
性熱可塑性有機ポリマーを含む有機バインダーを混合し
て組成物を得る。Next, an organic binder containing at least one water-soluble thermoplastic organic polymer is mixed with the kneaded product to obtain a composition.
【００２０】超硬合金粉末としては、例えば、平均粒径
０．１〜３μｍの粉末が用いられる。As the cemented carbide powder, for example, a powder having an average particle size of 0.1 to 3 μm is used.
【００２１】本発明方法においては、有機バインダーと
して、少なくとも一種の水不溶性熱可塑性有機ポリマー
と、少なくとも一種の水溶性熱可塑性有機ポリマーとを
含む有機バインダーが用いられる。In the method of the present invention, an organic binder containing at least one water-insoluble thermoplastic organic polymer and at least one water-soluble thermoplastic organic polymer is used as the organic binder.
【００２２】これらの有機バインダーの配合量は、配合
される超硬合金粉末の特性によって異なるが、超硬合金
粉末重量に対し、５〜１０重量部程度とされ、体積比率
に換算すると４０〜６０容量％程度である。The amount of the organic binder varies depending on the characteristics of the cemented carbide powder to be incorporated, but is about 5 to 10 parts by weight based on the weight of the cemented carbide powder. It is about the capacity%.
【００２３】これらの有機バインダーのうち、水溶性熱
可塑性有機ポリマーの配合量は、脱脂性の点から５０重
量％以上が好ましい。Among these organic binders, the amount of the water-soluble thermoplastic organic polymer is preferably at least 50% by weight from the viewpoint of degreasing.
【００２４】水不溶性熱可塑性有機ポリマーとしては、
例えばポリスチレン、ポリエチレン、ポリメタクリル酸
エステル、エチレン酢酸ビニル共重合体、ワックス等が
用いられる。The water-insoluble thermoplastic organic polymer includes
For example, polystyrene, polyethylene, polymethacrylate, ethylene-vinyl acetate copolymer, wax and the like are used.
【００２５】水溶性熱可塑性有機ポリマーとしては、例
えばポリエチレンオキサイド、ポリエチレングリコー
ル、メチルセルロース、ポリアクリルアミド、ポリビニ
ルエーテル、ポリアクリル酸等が用いられる。As the water-soluble thermoplastic organic polymer, for example, polyethylene oxide, polyethylene glycol, methyl cellulose, polyacrylamide, polyvinyl ether, polyacrylic acid and the like are used.
【００２６】これらの化合物のうち、ポリエチレンオキ
サイドが、可塑成形性に優れ、他の水溶性熱可塑性有機
ポリマーとの相溶性が良好であるばかりでなく、前記水
不溶性熱可塑性有機ポリマーとの相溶性も良好であり、
特に好ましい。Among these compounds, polyethylene oxide is not only excellent in plastic moldability and good in compatibility with other water-soluble thermoplastic organic polymers, but also compatible with the water-insoluble thermoplastic organic polymer. Is also good,
Particularly preferred.
【００２７】更に、このようにして得られる組成物を可
塑成形、例えば射出成形して成形体とする。Further, the composition thus obtained is subjected to plastic molding, for example, injection molding to obtain a molded article.
【００２８】次いで、このようにして得られる成形体
に、次の２段階からなる脱脂処理を行って脱脂体とす
る。即ち、本発明方法においては、脱脂処理の第１工程
として、まず成形体と水（常温水及び加熱水を含む。以
下同様）とを接触させて、これにより前記水溶性熱可塑
性有機ポリマーを溶出させる。Next, the molded body thus obtained is subjected to a degreasing treatment comprising the following two steps to obtain a degreased body. That is, in the method of the present invention, as the first step of the degreasing treatment, first, the molded body is brought into contact with water (including room temperature water and heated water; the same applies hereinafter), whereby the water-soluble thermoplastic organic polymer is eluted. Let it.
【００２９】この際、成形体と水との接触は、成形体を
水に浸漬することにより行うことが作業上から好まし
い。更にこの接触した水を流動化させることにより前記
水溶性熱可塑性有機ポリマーを急速に溶出させることが
できる。At this time, the contact between the molded body and water is preferably carried out by immersing the molded body in water from the viewpoint of work. Further, by fluidizing the contacted water, the water-soluble thermoplastic organic polymer can be rapidly eluted.
【００３０】この際、超硬合金粉末表面が水不溶性熱可
塑性有機ポリマーにより被覆されているため、超硬合金
粉末と水との反応が防止され、炭素量のコントロールが
容易となる。At this time, since the surface of the cemented carbide powder is coated with the water-insoluble thermoplastic organic polymer, the reaction between the cemented carbide powder and water is prevented, and the amount of carbon is easily controlled.
【００３１】次いで、前記脱脂処理の第１工程で得られ
る脱脂体に、脱脂処理の第２工程として、更に加熱炉に
おいて加熱脱脂を行い、水不溶性熱可塑性有機ポリマー
等の残りの有機バインダーを加熱除去して脱脂体とす
る。Next, the degreased body obtained in the first step of the degreasing treatment is further subjected to heat degreasing in a heating furnace as a second step of the degreasing treatment, and the remaining organic binder such as a water-insoluble thermoplastic organic polymer is heated. Remove to make defatted body.
【００３２】この加熱脱脂を行うに際しては、加熱炉の
雰囲気を、水素ガス気流とするか、又は減圧下（１００
ｔｏｒｒ以下）に保つか、あるいは減圧下（１００ｔｏ
ｒｒ以下）の水素ガス気流とすることが、水不溶性熱可
塑性有機ポリマー等の残りの有機バインダーの除去時間
をより短縮し、また炭素もより除去できるという点から
好ましい。When performing the heating degreasing, the atmosphere of the heating furnace is set to a hydrogen gas stream or a reduced pressure (100
Torr or less, or under reduced pressure (100 to
It is preferable to use a hydrogen gas stream of (rr or less) since the time for removing the remaining organic binder such as a water-insoluble thermoplastic organic polymer can be further shortened and carbon can be further removed.
【００３３】更に、このようにして得られる脱脂体を焼
結することにより、目的とする超硬合金製部品が得られ
る。Further, by sintering the degreased body obtained in this way, a target cemented carbide part can be obtained.
【００３４】前記脱脂処理及び焼結について、より好ま
しい態様に基づいて、以下に、詳細に説明する。The degreasing treatment and the sintering will be described in detail below based on more preferred embodiments.
【００３５】例えば、前記成形体と水とを接触させ、こ
の接触した水を流動化させることにより、前記水溶性熱
可塑性有機ポリマーを急速に溶出させる。次いでこの第
１工程で得られる脱脂体を、例えば密閉構造のカーボン
ヒーター炉の中に入れ、１×１０-2ｔｏｒｒまで真空引
きした後、炉内に水素ガスを充填させ、炉内が常圧にな
った後、水素ガスを２〜５ｌ／ｍｉｎ程度流しながら、
昇温速度５０℃／ｈｒ以下で、約３００〜４００℃程度
まで加熱して脱脂を行なう。その後、炉内を真空引き
し、炉内の真空度が１００ｔｏｒｒ以下に保たれるよう
にしながら、焼結温度まで昇温して焼結する。For example, the water-soluble thermoplastic organic polymer is rapidly eluted by bringing the molded body into contact with water and fluidizing the contacted water. Next, the degreased body obtained in the first step is placed in, for example, a carbon heater furnace having a closed structure, evacuated to 1 × 10 -2 torr, and then filled with hydrogen gas in the furnace. After that, while flowing hydrogen gas at about 2 to 5 l / min,
Degreasing is performed by heating to a temperature of about 300 to 400 ° C. at a heating rate of 50 ° C./hr or less. Thereafter, the inside of the furnace is evacuated, and the furnace is heated to a sintering temperature and sintered while keeping the degree of vacuum in the furnace at 100 torr or less.
【００３６】また、この第１工程で得られる脱脂体を、
例えば密閉構造のカーボンヒーター炉の中に入れ、真空
引きし、炉内の圧力が１００ｔｏｒｒ以下の真空度に達
した後、この真空度を保ちながら、昇温速度５０℃／ｈ
ｒ以下で、約３００〜４００℃程度まで加熱して脱脂を
行う。その後、炉内を真空引きし、炉内の真空度が１０
０ｔｏｒｒ以下に保たれるようにしながら、焼結温度ま
で昇温して焼結する。The degreased body obtained in the first step is
For example, it is placed in a carbon heater furnace having a closed structure and evacuated. After the pressure in the furnace reaches a degree of vacuum of 100 torr or less, the temperature is raised at a rate of 50 ° C./h while maintaining the degree of vacuum.
r or less, it is heated to about 300 to 400 ° C. to perform degreasing. Then, the inside of the furnace is evacuated and the degree of vacuum in the furnace is set to 10
While maintaining the pressure at 0 torr or less, the temperature is raised to the sintering temperature and sintering is performed.
【００３７】また、この第１工程で、０．１〜１μｍ
の、粒子径の細かい超硬合金粉末を使用した成形体から
得られる脱脂体を、例えば密閉構造のカーボンヒーター
炉の中に入れ、１×１０-2ｔｏｒｒまで真空引きした
後、炉内に水素ガスを充填させ、炉内が常圧になった
後、水素ガスを２〜５ｌ／ｍｉｎ程度流しながら、炉内
の真空度が１００ｔｏｒｒ以下に保たれるようにしなが
ら、約３００〜４００℃程度まで加熱して脱脂を行う。
その後、炉内を真空引きし、炉内の真空度が１００ｔｏ
ｒｒ以下に保たれるようにしながら、焼結温度まで昇温
して焼結する。In the first step, 0.1 to 1 μm
The degreased body obtained from the compact using the cemented carbide powder having a fine particle diameter is placed in, for example, a closed carbon heater furnace and evacuated to 1 × 10 -2 torr. After the gas is filled and the inside of the furnace is at normal pressure, while flowing hydrogen gas at about 2 to 5 l / min, while maintaining the degree of vacuum in the furnace at 100 torr or less, up to about 300 to 400 ° C. Degreasing by heating.
Then, the inside of the furnace is evacuated and the degree of vacuum in the furnace is 100 to
While maintaining the temperature at rr or less, the temperature is raised to the sintering temperature and sintering is performed.
【００３８】[0038]
【作用】これらの工程を経ることにより、本発明におい
ては、水抽出脱脂時において、脱脂体に予め設けられた
バインダーの抜け道から、バインダーの加熱分解、蒸
発、あるいはバインダーと水素ガスとの反応により生ず
るガスが抜け、その結果、成形体に変形や膨れを起こさ
ず、脱脂時間を短くすることができ、しかもバインダー
中の炭素を完全に除去することができる。According to the present invention, through these steps, during the water extraction degreasing, the binder is thermally decomposed and evaporated, or a reaction between the binder and hydrogen gas is performed through a binder escape route provided in advance in the degreased body. The generated gas escapes, and as a result, the molded body does not deform or swell, the degreasing time can be shortened, and the carbon in the binder can be completely removed.
【００３９】また、この脱脂体を焼結した焼結体は、焼
結体密度が高く、機械的特性に優れ、均質な組織を有す
るものである。The sintered body obtained by sintering the degreased body has a high sintered body density, excellent mechanical properties, and a homogeneous structure.
【００４０】即ち、前記の工程を経る本発明の超硬合金
部品の製造方法によれば、成形体と水とを接触させるこ
とにより、水溶性熱可塑性有機ポリマーの除去時間が短
縮され、しかもその十分な除去が可能となる。That is, according to the method for manufacturing a cemented carbide part of the present invention through the above-described steps, the time for removing the water-soluble thermoplastic organic polymer is reduced by bringing the molded body into contact with water. Sufficient removal becomes possible.
【００４１】そのため、その後の加熱処理による水不溶
性熱可塑性有機ポリマーの除去において、水との接触に
より成形体中に生じる水溶性ポリマーの溶出痕が、加熱
脱脂時に、バインダーが加熱分解又は蒸発した際に生ず
るガスの抜け道になり、あるいは水素ガス中で加熱脱脂
を行う場合は、水素ガスとバインダーとの接する面積が
増加すること等の理由により、その後の急速加熱が可能
となり、その結果、従来に比して大幅に脱脂時間を短縮
することができる。また、このように脱脂時間が短縮さ
れることから、生産コストを低減させることもできる。Therefore, in the subsequent removal of the water-insoluble thermoplastic organic polymer by a heat treatment, traces of the water-soluble polymer eluted in the molded article due to contact with water are generated when the binder is thermally decomposed or evaporated during degreasing by heating. When performing degreasing by heating in hydrogen gas or when performing degreasing by heating in hydrogen gas, rapid heating can be performed thereafter because of the increase in the area in contact with the hydrogen gas and the binder. The degreasing time can be greatly reduced as compared with the above. Further, since the degreasing time is shortened in this manner, the production cost can be reduced.
【００４２】また、前記のように第１工程で得られる脱
脂体を、水素ガス気流中で、あるいは減圧下（１００ｔ
ｏｒｒ以下）で加熱脱脂処理する場合には、急速加熱が
可能となり、従って全脱脂時間を短縮することができ、
また、有機バインダー中の炭素をほぼ完全に除去するこ
とができる。Further, the degreased body obtained in the first step as described above is placed in a stream of hydrogen gas or under reduced pressure (100 t).
(orr or less), when heating and degreasing, rapid heating is possible, and therefore the total degreasing time can be shortened,
Further, carbon in the organic binder can be almost completely removed.
【００４３】また、この第１工程で、０．１〜１μｍ
の、粒子径の細かい超硬合金粉末を用いる成形体から得
られる脱脂体を、水素ガス気流中で、かつ減圧下（１０
０ｔｏｒｒ以下）に炉内の圧力を保ちながら、加熱脱脂
処理する場合には、脱脂体に膨れや亀裂の発生がなく、
従って、この脱脂体を焼結処理しても、健全で均質な組
織を有し、高い焼結体密度を有する焼結体を得ることが
できる。In the first step, 0.1 to 1 μm
A degreased body obtained from a compact using a cemented carbide powder having a fine particle diameter in a hydrogen gas stream and under reduced pressure (10
(0 torr or less), when performing degreasing by heating while maintaining the pressure in the furnace, there is no swelling or cracking of the degreased body,
Therefore, even if this degreased body is sintered, a sintered body having a sound and homogeneous structure and a high sintered body density can be obtained.
【００４４】[0044]
【実施例】以下、実施例により本発明を詳細に説明す
る。The present invention will be described below in detail with reference to examples.
【００４５】実施例１ 組成がＷＣ−６Ｃｏ超硬合金粉末（平均粒子径１．０〜
１．２μｍ）１００重量部に、水不溶性熱可塑性有機ポ
リマーとしてエチレン酢酸ビニル共重合体１．０重量部
を配合し、混練機により１４５℃で３０分間混練して混
練物を得た。Example 1 A WC-6Co cemented carbide powder having an average particle diameter of 1.0 to
1.2 μm) of 100 parts by weight of a water-insoluble thermoplastic organic polymer was mixed with 1.0 part by weight of an ethylene-vinyl acetate copolymer, and kneaded with a kneader at 145 ° C. for 30 minutes to obtain a kneaded product.
【００４６】次いで、該混練物に対し、水溶性熱可塑性
有機ポリマーとしてポリエチレンオキサイド３．０重量
部、パラフィンワックス１．５重量部及び潤滑剤として
ステアリン酸０．５重量部を配合し、これらを混練機に
より１４５℃で３０分間混練して組成物を得た。Next, 3.0 parts by weight of polyethylene oxide as a water-soluble thermoplastic organic polymer, 1.5 parts by weight of paraffin wax and 0.5 part by weight of stearic acid as a lubricant were added to the kneaded product. The composition was obtained by kneading at 145 ° C. for 30 minutes using a kneader.
【００４７】得られた組成物を粉砕し、スクリュー式射
出成形機により、射出成形温度１６０℃、射出圧力１０
００ｋｇ／ｃｍ2 で射出成形して、次の３サイズの棒状
成形体を得た。The obtained composition was pulverized, and the injection molding temperature was 160 ° C. and the injection pressure was 10 with a screw type injection molding machine.
Injection molding was performed at 00 kg / cm 2 to obtain a rod-shaped molded product of the following three sizes.
【００４８】（イ）7mm ×7mm ×70mm （ロ）14mm×14mm×100mm （ハ）20mm×20mm×100mm(B) 7mm x 7mm x 70mm (b) 14mm x 14mm x 100mm (c) 20mm x 20mm x 100mm
【００４９】次いで、得られた棒状成形体と水とを、図
１に示す装置を使用して接触させて、水温６０℃、給排
水の水量１ｌ／ｍｉｎの条件で５時間溶出処理した。こ
のときの溶出率は、（イ）が９２％、（ロ）が８０％、
（ハ）が６５％であった。図２は、（ハ）の場合につい
て、溶出時間と溶出率との関係を示す図である。Then, the obtained rod-shaped molded body was brought into contact with water using the apparatus shown in FIG. 1 and subjected to elution treatment for 5 hours at a water temperature of 60 ° C. and a supply / drainage water amount of 1 l / min. At this time, the elution rate was (a) 92%, (b) 80%,
(C) was 65%. FIG. 2 is a diagram showing the relationship between the elution time and the elution rate for the case (c).
【００５０】次いで、これらの成形体を真空乾燥後、真
空雰囲気炉で炉内の真空度を１×１０-2ｔｏｒｒ以下に
した後、炉内を水素ガスにて大気圧まで充填し、水素ガ
ス気流中で常温から１００℃まで０．５時間、１００℃
から３００℃まで４時間で昇温し、３００℃で０．５時
間保持した。Next, these compacts are vacuum-dried, the degree of vacuum in the furnace is reduced to 1 × 10 -2 torr or less in a vacuum atmosphere furnace, and the inside of the furnace is filled with hydrogen gas to atmospheric pressure. 0.5 hours from normal temperature to 100 ° C in air flow, 100 ° C
From 300 ° C. for 4 hours and kept at 300 ° C. for 0.5 hour.
【００５１】得られた脱脂体を調べたところ、いずれの
部品も膨れや亀裂の発生がみられず、変形もみられなか
った。また９８％から９９％の有機バインダーの除去が
認められた。When the obtained degreased bodies were examined, no swelling or cracking was observed in any of the parts, and no deformation was observed. Also, 98% to 99% of the organic binder was removed.
【００５２】その後、これらの脱脂体を真空雰囲気下
で、１４５０℃で１時間焼結し、得られた焼結体につい
て、焼結体密度、炭素量及び抗折力を測定した。Thereafter, these degreased bodies were sintered in a vacuum atmosphere at 1450 ° C. for 1 hour, and the sintered bodies thus obtained were measured for density, carbon content and bending strength.
【００５３】（イ）が焼結体密度１４．９５ｇ／ｃ
ｍ3 、炭素量５．８０％、抗折力１９５ｋｇ／ｍｍ2 、
（ロ）が焼結体密度１４．９０ｇ／ｃｍ3 、炭素量５．
７８％、抗折力２０５ｋｇ／ｍｍ2 、（ハ）が焼結体密
度１４．８５ｇ／ｃｍ3 、炭素量５．７６％、抗折力２
１０ｋｇ／ｍｍ2 であった。(A) is a sintered body density of 14.95 g / c.
m 3 , carbon content 5.80%, bending strength 195 kg / mm 2 ,
(B) shows a sintered body density of 14.90 g / cm 3 and a carbon content of 5.
78%, bending strength 205 kg / mm 2 , (c): sintered body density 14.85 g / cm 3 , carbon content 5.76%, bending strength 2
It was 10 kg / mm 2 .
【００５４】また、いずれの試験片も１５００倍で顕微
鏡観察したところ、粗大ポア（５μｍ以上）の存在は確
認されず、健全で、かつ均質な組織を有し、高い焼結体
密度を有することが確認された。In addition, when any of the test pieces was observed under a microscope at 1500 ×, the presence of coarse pores (5 μm or more) was not confirmed, and the test pieces had a sound and homogeneous structure and a high sintered body density. Was confirmed.
【００５５】実施例２ 組成がＷＣ−１２Ｃｏ超硬合金粉末（平均粒子径１．０
〜１．５μｍ）１００重量部に、水不溶性熱可塑性有機
ポリマーとしてエチレン酢酸ビニル共重合体１．０重量
部を配合し、混練機により１４５℃で３０分間混練して
混練物を得た。Example 2 The composition was WC-12Co cemented carbide powder (average particle size 1.0
1.0-1.5 parts by weight of a water-insoluble thermoplastic organic polymer and 100 parts by weight of an ethylene-vinyl acetate copolymer, and kneaded with a kneader at 145 ° C. for 30 minutes to obtain a kneaded product.
【００５６】次いで、該混練物に対し、水溶性熱可塑性
有機ポリマーとしてポリエチレンオキサイド３．０重量
部、パラフィンワックス１．５重量部及び潤滑剤として
ステアリン酸１．０重量部を配合し、実施例１と同様に
混練、射出成形を行って、次の２サイズの棒状成形体を
得た。Next, 3.0 parts by weight of polyethylene oxide as a water-soluble thermoplastic organic polymer, 1.5 parts by weight of paraffin wax and 1.0 part by weight of stearic acid as a lubricant were added to the kneaded product. Kneading and injection molding were carried out in the same manner as in Example 1 to obtain the following two-size rod-shaped moldings.
【００５７】（ニ）14mm×14mm×100mm （ホ）20mm×20mm×100mm(D) 14 mm x 14 mm x 100 mm (e) 20 mm x 20 mm x 100 mm
【００５８】次いで、得られた棒状成形体と水とを、図
１に示す装置を使用して接触させて、水温６０℃、給排
水の水量３ｌ／ｍｉｎの条件で３時間溶出処理した。こ
のときの溶出率は、（ニ）が８６％、（ホ）が７４％で
あった。図３は、（ホ）の場合について、溶出時間と溶
出率との関係を示す図である。Next, the obtained rod-shaped molded body was brought into contact with water using the apparatus shown in FIG. 1 and subjected to an elution treatment at a water temperature of 60 ° C. and a supply / drainage water amount of 3 l / min for 3 hours. The elution rate at this time was 86% for (d) and 74% for (e). FIG. 3 is a diagram showing the relationship between the elution time and the elution rate in the case of (e).
【００５９】次いで、これらの成形体を真空乾燥後、実
施例１と同様に水素ガス気流中で加熱脱脂したところ、
いずれの脱脂体にも欠陥が認められなかった。Next, these compacts were vacuum-dried and then heated and degreased in a stream of hydrogen gas in the same manner as in Example 1.
No defect was observed in any of the degreased bodies.
【００６０】その後、これらの脱脂体を真空雰囲気下
で、１４００℃で１時間焼結し、得られた焼結体につい
て、焼結体密度、炭素量及び抗折力を測定した。Thereafter, these degreased bodies were sintered in a vacuum atmosphere at 1400 ° C. for 1 hour, and the sintered bodies thus obtained were measured for sintered body density, carbon content and bending strength.
【００６１】（ニ）が焼結体密度１４．４５ｇ／ｃ
ｍ3 、炭素量５．４５％、抗折力２９０ｋｇ／ｍｍ2 、
（ホ）が焼結体密度１４．３５ｇ／ｃｍ3 、炭素量５．
４０％、抗折力２８０ｋｇ／ｍｍ2 であった。(D) The sintered body density is 14.45 g / c
m 3 , carbon content 5.45%, bending strength 290 kg / mm 2 ,
(E) has a sintered body density of 14.35 g / cm 3 and a carbon content of 5.
40%, and the transverse rupture strength was 280 kg / mm 2 .
【００６２】また、いずれの試験片も１５００倍で顕微
鏡観察したところ、粗大ポア（５μｍ以上）の存在は確
認されず、健全で、かつ均質な組織を有し、高い焼結体
密度を有することが確認された。In addition, when any of the test pieces was observed under a microscope at 1500 ×, the presence of coarse pores (5 μm or more) was not confirmed, and the test pieces had a sound and homogeneous structure and a high sintered body density. Was confirmed.
【００６３】実施例３ 組成がＷＣ−１３．５Ｃｏー０．５ＴａＣの超硬合金粉
末（平均粒子径０．６〜０．８μｍ）１００重量部に、
水不溶性熱可塑性有機ポリマーとしてエチレン酢酸ビニ
ル共重合体０．５重量部を配合し、混練機により１４５
℃で３０分間混練して混練物を得た。Example 3 100 parts by weight of a cemented carbide powder having a composition of WC-13.5Co-0.5TaC (average particle diameter: 0.6 to 0.8 μm)
0.5 parts by weight of an ethylene-vinyl acetate copolymer was blended as a water-insoluble thermoplastic organic polymer, and 145 was mixed with a kneader.
The mixture was kneaded at 30 ° C for 30 minutes to obtain a kneaded product.
【００６４】次いで、該混練物に対し、水溶性熱可塑性
有機ポリマーとしてポリエチレングリコール３．５重量
部、パラフィンワックス２．０重量部及び潤滑剤として
ステアリン酸０．５重量部を配合し、実施例１と同様に
混練、射出成形を行って、次の２サイズの棒状成形体を
得た。Then, 3.5 parts by weight of polyethylene glycol as a water-soluble thermoplastic organic polymer, 2.0 parts by weight of paraffin wax and 0.5 part by weight of stearic acid as a lubricant were added to the kneaded product. Kneading and injection molding were carried out in the same manner as in Example 1 to obtain the following two-size rod-shaped moldings.
【００６５】（ヘ）14mm×14mm×100mm （ト）20mm×20mm×100mm(F) 14 mm x 14 mm x 100 mm (g) 20 mm x 20 mm x 100 mm
【００６６】次いで、得られた棒状成形体と水とを、図
１に示す装置を使用して接触させて、水温５０℃、給排
水の水量３ｌ／ｍｉｎの条件で３時間溶出処理した。こ
のときの溶出率は、（ヘ）が８３％、（ト）が７１％で
あった。図４は、（ヘ）及び（ト）の場合について、溶
出時間と溶出率との関係を示す図である。Next, the obtained rod-shaped compact was brought into contact with water using the apparatus shown in FIG. 1 and subjected to an elution treatment at a water temperature of 50 ° C. and a supply / drainage water volume of 3 l / min for 3 hours. The elution rate at this time was 83% for (f) and 71% for (g). FIG. 4 is a diagram showing the relationship between the elution time and the elution rate in the cases (f) and (g).
【００６７】次いで、これらの成形体を真空乾燥後、真
空雰囲気炉で炉内の真空度を１×１０-2ｔｏｒｒ以下に
保ちつつ、水素ガスを真空雰囲気炉内に供給しながら加
熱脱脂したところ、いずれの脱脂体にも欠陥が認められ
なかった。Next, these compacts were vacuum-dried and then heated and degreased in a vacuum atmosphere furnace while supplying a hydrogen gas into the vacuum atmosphere furnace while maintaining the degree of vacuum in the furnace at 1 × 10 −2 torr or less. No defects were found in any of the degreased bodies.
【００６８】その後、これらの脱脂体を真空雰囲気下
で、１３６０℃で１時間焼結し、得られた焼結体につい
て、焼結体密度、炭素量及び抗折力を測定した。Thereafter, these degreased bodies were sintered in a vacuum atmosphere at 1360 ° C. for 1 hour, and the sintered bodies thus obtained were measured for sintered body density, carbon content and bending strength.
【００６９】（ヘ）が焼結体密度１４．１５ｇ／ｃ
ｍ3 、炭素量５．１５％、抗折力２９０ｋｇ／ｍｍ2 、
（ト）が焼結体密度１４．０５ｇ／ｃｍ3 、炭素量５．
２５％、抗折力２８０ｋｇ／ｍｍ2 であった。(F) is a sintered body density of 14.15 g / c
m 3 , carbon content 5.15%, bending strength 290 kg / mm 2 ,
(G) has a sintered body density of 14.05 g / cm 3 and a carbon content of 5.
The bending strength was 280 kg / mm 2 , 25%.
【００７０】また、いずれの試験片も１５００倍で顕微
鏡観察したところ、粗大ポア（５μｍ以上）の存在は確
認されず、健全で、かつ均質な組織を有し、高い焼結体
密度を有することが確認された。In addition, microscopic observation of all the test pieces at 1500 magnifications revealed that the presence of coarse pores (5 μm or more) was not confirmed, and that the test pieces had a sound and homogeneous structure and a high sintered body density. Was confirmed.
【００７１】[0071]
【発明の効果】本発明の超硬合金製部品の製造方法によ
れば、短時間の脱脂時間でも成形体の変形や膨れを起こ
さず、しかも有機バインダー中の炭素を完全に除去で
き、使用する超硬合金粉末の本来の物性が損なわれず、
０．１〜１μｍの、粒子径の細かい超硬合金粉末を使用
する場合にも、焼結体密度が高く、機械的特性に優れ、
かつ均質な焼結体を得ることができる。According to the method of manufacturing a cemented carbide part according to the present invention, the compact is not deformed or swollen even with a short degreasing time, and the carbon in the organic binder can be completely removed. The original physical properties of cemented carbide powder are not impaired,
Even when using a cemented carbide powder having a fine particle diameter of 0.1 to 1 μm, the sintered body density is high and the mechanical properties are excellent,
In addition, a homogeneous sintered body can be obtained.
【図１】本発明の方法を実施するに際し使用される装置
の概略構成図である。FIG. 1 is a schematic structural diagram of an apparatus used in performing a method of the present invention.
【図２】図１に示す装置を使用して脱脂したときの、溶
出時間と溶出率との関係を示す図である。FIG. 2 is a diagram showing a relationship between an elution time and an elution rate when degreased using the apparatus shown in FIG.
【図３】図１に示す装置を使用して脱脂したときの、溶
出時間と溶出率との関係を示す図である。FIG. 3 is a diagram showing the relationship between the elution time and the elution rate when degreased using the apparatus shown in FIG.
【図４】図１に示す装置を使用して脱脂したときの、溶
出時間と溶出率との関係を示す図である。FIG. 4 is a diagram showing the relationship between the elution time and the elution rate when degreasing is performed using the apparatus shown in FIG.
１ 溶出槽 ２ 水 ３ 排出管 ４ 給水管 ５ 成形体 ６ 支持台 ７ 給水口 DESCRIPTION OF SYMBOLS 1 Elution tank 2 Water 3 Discharge pipe 4 Water supply pipe 5 Molded body 6 Support base 7 Water supply port
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) B22F 3/02 B22F 1/00 B22F 3/10 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 7 , DB name) B22F 3/02 B22F 1/00 B22F 3/10
Claims (4)
性熱可塑性有機ポリマーを混合して、該超硬合金粉末の
表面が該水不溶性熱可塑性有機ポリマーで被覆された混
練物を得、次いで該混練物に少なくとも一種の水溶性熱
可塑性有機ポリマーを含む有機バインダーを混合して組
成物を得、更に該組成物を可塑成形して成形体とし、該
成形体と水とを接触させて該水溶性熱可塑性有機ポリマ
ーを溶出させた後、加熱炉において残りの有機バインダ
ーを加熱脱脂して脱脂体とし、該脱脂体を焼結すること
を特徴とする超硬合金製部品の製造方法。1. A kneaded product in which at least one water-insoluble thermoplastic organic polymer is mixed with cemented carbide powder to obtain a kneaded material whose surface is coated with the water-insoluble thermoplastic organic polymer. An organic binder containing at least one water-soluble thermoplastic organic polymer is mixed with the kneaded product to obtain a composition, and the composition is further plastically molded to form a molded article. A method for producing a cemented carbide part, comprising: eluted a thermoplastic organic polymer; heat-degrease the remaining organic binder in a heating furnace to form a degreased body; and sintering the degreased body.
ることを特徴とする請求項１に記載の超硬合金製部品の
製造方法。2. The method for manufacturing a cemented carbide part according to claim 1, wherein the atmosphere during the heating degreasing is a hydrogen gas stream.
下の圧力に保つことを特徴とする請求項１に記載の超硬
合金製部品の製造方法。3. The method for manufacturing a cemented carbide part according to claim 1, wherein the atmosphere during the heating degreasing is maintained at a pressure of 100 torr or less.
し、加熱脱脂時の雰囲気を、水素ガス気流とし、かつ１
００ｔｏｒｒ以下の圧力に保つことを特徴とする請求項
１に記載の超硬合金製部品の製造方法。4. Use of cemented carbide powder having a diameter of 0.1 to 1 μm, an atmosphere for degreasing by heating, a hydrogen gas flow,
The method for producing a cemented carbide part according to claim 1, wherein the pressure is maintained at not more than 00 torr.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18505792A JP3212698B2 (en) | 1992-07-13 | 1992-07-13 | Manufacturing method of cemented carbide parts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18505792A JP3212698B2 (en) | 1992-07-13 | 1992-07-13 | Manufacturing method of cemented carbide parts |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0625709A JPH0625709A (en) | 1994-02-01 |
| JP3212698B2 true JP3212698B2 (en) | 2001-09-25 |
Family
ID=16164056
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18505792A Expired - Fee Related JP3212698B2 (en) | 1992-07-13 | 1992-07-13 | Manufacturing method of cemented carbide parts |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3212698B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3872714B2 (en) * | 2002-04-22 | 2007-01-24 | 有限会社コーキ・エンジニアリング | Method for producing molding composition for powder sintering, composition produced by the method, sintering method thereof, and powder sintered member thereof |
| WO2005011900A1 (en) * | 2003-08-04 | 2005-02-10 | Coki Engineering Inc. | Molding composition for powder sintering, method of sintering powder for sintering, and sinter member made from the powder |
| NL2003325C2 (en) * | 2009-08-03 | 2011-02-04 | Syroko B V | Method for producing a powder injection moulded part. |
| CN104357696B (en) * | 2014-12-01 | 2016-04-27 | 技锋精密刀具（马鞍山）有限公司 | A kind of sintering process of carbide paraffin production technique goods |
| CN109014178B (en) * | 2018-08-31 | 2020-08-04 | 晋城鸿刃科技有限公司 | Hard alloy extrusion forming preparation method |
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1992
- 1992-07-13 JP JP18505792A patent/JP3212698B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0625709A (en) | 1994-02-01 |
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