JP2978052B2 - Composition for powder metallurgy and method for producing the same - Google Patents
Composition for powder metallurgy and method for producing the sameInfo
- Publication number
- JP2978052B2 JP2978052B2 JP6064565A JP6456594A JP2978052B2 JP 2978052 B2 JP2978052 B2 JP 2978052B2 JP 6064565 A JP6064565 A JP 6064565A JP 6456594 A JP6456594 A JP 6456594A JP 2978052 B2 JP2978052 B2 JP 2978052B2
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- powder
- composition
- carbon
- weight
- plate
- Prior art date
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- 239000000203 mixture Substances 0.000 title claims description 69
- 238000004519 manufacturing process Methods 0.000 title claims description 24
- 238000004663 powder metallurgy Methods 0.000 title claims description 21
- 239000000843 powder Substances 0.000 claims description 74
- 229910052799 carbon Inorganic materials 0.000 claims description 54
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 53
- 239000000956 alloy Substances 0.000 claims description 43
- 229910045601 alloy Inorganic materials 0.000 claims description 43
- 229910052759 nickel Inorganic materials 0.000 claims description 27
- 229910052804 chromium Inorganic materials 0.000 claims description 23
- 229910052721 tungsten Inorganic materials 0.000 claims description 22
- 150000001875 compounds Chemical class 0.000 claims description 21
- 239000002131 composite material Substances 0.000 claims description 20
- 229910052751 metal Inorganic materials 0.000 claims description 16
- 239000002184 metal Substances 0.000 claims description 16
- 239000007858 starting material Substances 0.000 claims description 14
- 239000011812 mixed powder Substances 0.000 claims description 11
- 229910002804 graphite Inorganic materials 0.000 claims description 10
- 239000010439 graphite Substances 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 10
- 239000007789 gas Substances 0.000 claims description 9
- 150000002739 metals Chemical class 0.000 claims description 7
- 239000006104 solid solution Substances 0.000 claims description 7
- 239000000919 ceramic Substances 0.000 claims description 5
- 150000001247 metal acetylides Chemical class 0.000 claims description 5
- 239000011195 cermet Substances 0.000 claims description 3
- 150000004767 nitrides Chemical class 0.000 claims description 3
- 230000000737 periodic effect Effects 0.000 claims description 3
- 229910052720 vanadium Inorganic materials 0.000 claims description 3
- 238000005255 carburizing Methods 0.000 claims description 2
- 239000011261 inert gas Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- -1 as well as Co Substances 0.000 claims 2
- 239000013078 crystal Substances 0.000 description 17
- 239000012071 phase Substances 0.000 description 12
- 238000000034 method Methods 0.000 description 11
- 238000002156 mixing Methods 0.000 description 11
- 238000005245 sintering Methods 0.000 description 11
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 11
- 239000002245 particle Substances 0.000 description 9
- 229910052719 titanium Inorganic materials 0.000 description 9
- 239000011230 binding agent Substances 0.000 description 6
- 229910052715 tantalum Inorganic materials 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229920000049 Carbon (fiber) Polymers 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- 239000004917 carbon fiber Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 229910003460 diamond Inorganic materials 0.000 description 2
- 239000010432 diamond Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 238000003908 quality control method Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 229910020599 Co 3 O 4 Inorganic materials 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 238000010000 carbonizing Methods 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Description
【０００１】[0001]
【産業上の利用分野】本発明は、板状の炭化タングステ
ンを晶出させて、硬さ，靭性，耐摩耗性，耐欠損性，耐
塑性変形性，耐熱亀裂性に優れる超硬合金またはサーメ
ットに代表される焼結合金を作製するための出発物質と
して適する粉末冶金用組成物およびその製造方法に関す
るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cemented carbide or cermet having excellent hardness, toughness, wear resistance, fracture resistance, plastic deformation resistance, and heat crack resistance by crystallizing plate-like tungsten carbide. The present invention relates to a powder metallurgy composition suitable as a starting material for producing a sintered alloy represented by the formula (1) and a method for producing the same.
【０００２】[0002]
【従来の技術】一般に、金属化合物の硬質相と金属の結
合相とでなる超硬合金またはサーメットに代表される焼
結合金は、多種多用の用途に実用されている。この焼結
合金は、硬さを高めて耐摩耗性を向上させると靭性の低
下および耐欠損性の劣下が生じ、逆に靭性および耐欠損
性を高めると硬さおよび耐摩耗性が低下するという二律
背反的傾向を示すという問題がある。この問題を解決す
るものとしての提案が多数行われている。2. Description of the Related Art In general, cemented carbides or sintered alloys such as cermets comprising a hard phase of a metal compound and a binder phase of a metal have been put to practical use in a wide variety of applications. In this sintered alloy, when the hardness is increased and the wear resistance is improved, the toughness is reduced and the fracture resistance is deteriorated, and when the toughness and the fracture resistance are increased, the hardness and the wear resistance are reduced. There is a problem that shows a trade-off tendency. Many proposals have been made to solve this problem.
【０００３】これらの提案の１つの方向として、ＷＣの
結晶面による機械的特性の異方性について注目したも
の、具体的には、例えばＷＣ結晶の（００１）面が最高
硬さで、（１００）面方向が最高弾性率を示すことか
ら、（１００）面方向に優先的に成長させ、（００１）
面が発達した三角状または六角状に代表される板状ＷＣ
の存在した焼結合金もしくはその製造方法に関するもの
がある。As one direction of these proposals, attention has been paid to the anisotropy of mechanical properties due to the crystal plane of WC. Specifically, for example, the (001) plane of the WC crystal has the highest hardness and (100) ) Since the plane direction shows the highest elastic modulus, it is preferentially grown in the (100) plane direction, and (001)
Plate-shaped WC represented by triangular or hexagonal shape with developed surface
And a method for producing the same.
【０００４】板状ＷＣに関連する先行技術の代表的なも
のに、特公昭４７−２３０４９号公報，特公昭４７−２
３０５０号公報，特開昭５７−３４００８号公報，特開
平２−４７２３９号公報，特開平２−５１４０８号公
報，特開平２−１３８４３４号公報，特開平２−２７４
８２７号公報および特開平５−３３９６５９号公報があ
る。[0004] Representative examples of prior art relating to plate-like WC include Japanese Patent Publication No. 47-23049 and Japanese Patent Publication No. 47-2.
JP-A-3050, JP-A-57-34008, JP-A-2-47239, JP-A-2-51408, JP-A-2-138434, JP-A-2-274
827 and JP-A-5-339659.
【０００５】[0005]
【発明が解決しようとする課題】板状ＷＣに関連する先
行技術の内、特公昭４７−２３０４９号公報，特公昭４
７−２３０５０号公報には、板状ＷＣを成長させるため
の多孔性の凝集体でなるコロイド状炭化タングステン粉
末とＦｅ，Ｎｉ，Ｃｏまたはこれらの合金の粉末からな
る組成物を出発物質として用いる板状ＷＣ含有超硬合金
の製造方法について記載されている。これら両公報に記
載されている組成物の出発物質は、コロイド状炭化タン
グステン粉末の調整が困難であり、これを用いて焼結合
金を作製する場合には、加熱焼結時における板状ＷＣ結
晶の生成割合が少なく、その粒径および含有量の制御が
困難であり、全製造工程が複雑で高価になるという問題
がある。Among prior arts relating to a plate-like WC, Japanese Patent Publication No. 47-23049 and Japanese Patent Publication No. Sho 4
Japanese Patent Application Laid-Open No. 7-23050 discloses a plate using, as a starting material, a composition comprising a colloidal tungsten carbide powder formed of a porous aggregate for growing a plate-like WC and a powder of Fe, Ni, Co or an alloy thereof. A method for producing a cemented carbide containing WC is described. The starting materials of the compositions described in these two publications are difficult to prepare colloidal tungsten carbide powder, and when a sintered alloy is produced using the same, a plate-like WC crystal during heat sintering is used. There is a problem that the production ratio is small, it is difficult to control the particle size and content thereof, and the whole manufacturing process is complicated and expensive.
【０００６】また、特開昭５７−３４００８号公報に
は、強粉砕したＷとＣの混合粉末に少量のＦｅ族金属塩
を添加した後、加熱，炭化して（００１）面を双晶面と
して接合された双晶炭化タングステンの製造方法につい
て記載されている。同公報に記載されている方法により
得られる粉末は、双晶炭化タングステンの含有割合が少
なく、かつ分離も困難であること、この粉末を出発物質
として焼結合金を作製すると、焼結合金中の双晶炭化タ
ングステン含有率がさらに少なくなって、その効果が非
常に弱くなるという問題がある。JP-A-57-34008 discloses that a small amount of a Fe group metal salt is added to a strongly pulverized mixed powder of W and C, and then heated and carbonized to change the (001) plane into a twin plane. It describes a method for producing twin tungsten carbide joined as a. The powder obtained by the method described in the publication has a low content ratio of twin tungsten carbide, and is difficult to separate. When a sintered alloy is produced using this powder as a starting material, There is a problem that the twin tungsten carbide content is further reduced and the effect is extremely weakened.
【０００７】さらに、特開平２−４７２３９号公報およ
び特開平２−１３８４３４号公報には、炭化タングステ
ンを過飽和に含有した（Ｗ，Ｔｉ，Ｔａ）Ｃの固溶体を
出発物質として、加熱焼結時に板状ＷＣを晶出させると
いう超硬合金の製造方法について記載されている。そし
て、これら両公報に記載されている炭化タングステンを
過飽和に含有した固溶体組成物については、特開平２−
５１４０８号公報に詳細に記載されている。これら３件
の公報に記載されている炭化タングステンを過飽和に含
有した固溶体組成物は、製造方法が困難であること、こ
れを用いて焼結合金を作製する場合に、焼結時における
板状ＷＣの生成割合が少ないこと、組成成分の制限され
た焼結合金にしか適用できないという問題がある。Further, JP-A-2-47239 and JP-A-2-138434 disclose that a solid solution of (W, Ti, Ta) C containing tungsten carbide in a supersaturated state is used as a starting material to form a sheet during heating and sintering. It describes a method for producing cemented carbide by crystallizing WC. The solid solution compositions containing tungsten carbide in supersaturation described in these two publications are disclosed in
It is described in detail in JP-A-51408. The solid solution compositions containing tungsten carbide in supersaturation described in these three publications are difficult to manufacture, and when a sintered alloy is produced using the solid solution composition, a plate-like WC during sintering is used. However, there is a problem that it is only applicable to a sintered alloy having a limited composition component.
【０００８】次に、特開平２−２７４８２７号公報に
は、使用済みの超硬合金を酸化し、還元した後、炭化し
て得られた組成物粉末を出発物質として用いて、焼結時
に、この出発物質中の微細炭化タングステンを粒成長さ
せて板状ＷＣ結晶とする異方性超硬合金成形体製造用粉
末について記載されている。同公報に記載の組成物粉末
は、この粉末を作製するための製造工程が複雑で高価に
なること、またこの粉末を用いて焼結合金を作製する場
合、板状ＷＣ結晶の生成割合が少なく、その粒径の制御
が困難であるという問題がある。[0008] Japanese Patent Application Laid-Open No. 2-274827 discloses that a composition powder obtained by oxidizing and reducing a used cemented carbide and then carbonizing the same is used as a starting material. A powder for producing an anisotropic cemented carbide alloy compact in which fine tungsten carbide in the starting material is grain-grown into plate-like WC crystals is described. In the composition powder described in the publication, the production process for producing this powder is complicated and expensive, and when producing a sintered alloy using this powder, the generation ratio of plate-like WC crystals is low. There is a problem that it is difficult to control the particle size.
【０００９】その他、特開平５−３３９６５９号公報に
は、０．５μｍ以下のＷＣと、３〜４０重量％の立方晶
系化合物と、１〜２５重量％のＣｏおよび／またはＮｉ
からなる混合粉末でなる出発物質を用いて、１４５０℃
以上で焼結し、板状ＷＣ結晶を有する超硬合金を作製す
る方法が記載されている。同公報に記載されている出発
物質は、長時間の混合粉砕によって微細で、かつ高歪量
の炭化タングステンの含有した粉末としているために、
不純物量が多くなること、製造工程時間が長くなるこ
と、これを用いて焼結合金を作製する場合、板状ＷＣ結
晶の生成割合が少なく、その粒径の制御も困難であると
いう問題がある。In addition, JP-A-5-339659 discloses that a WC of 0.5 μm or less, a cubic compound of 3 to 40% by weight, a Co and / or Ni of 1 to 25% by weight are used.
Using a starting material consisting of a mixed powder consisting of
A method for producing a cemented carbide having a plate-like WC crystal by sintering is described above. The starting material described in the publication is fine by long-time mixing and pulverization, and because it is a powder containing tungsten carbide with a high strain amount,
There is a problem that the amount of impurities increases, the manufacturing process time is prolonged, and when a sintered alloy is produced using the same, the generation ratio of plate-like WC crystals is small and the control of the particle size is difficult. .
【００１０】本発明は、上述のような問題点を解決した
もので、具体的には、焼結合金を作製するための出発物
質として用いた場合に、焼結合金中に板状ＷＣ結晶を容
易に含有させることができること、その含有量の制御お
よび粒径の制御を容易にすることができること、および
得られる焼結合金が高硬度，耐摩耗性に優れ、かつ高靭
性，耐欠損性に優れるという従来の焼結合金の出発物質
では考えられない高硬度，高靭性，高強度によるシナジ
効果を発揮し、長寿命を達成できる粉末冶金用組成物お
よびその製造方法の提供を目的とするものである。The present invention has solved the above-mentioned problems. Specifically, when used as a starting material for producing a sintered alloy, a plate-like WC crystal is contained in the sintered alloy. It can be easily incorporated, its content and particle size can be easily controlled, and the resulting sintered alloy has high hardness, excellent wear resistance, and high toughness and fracture resistance. An object of the present invention is to provide a composition for powder metallurgy that exhibits a synergistic effect due to high hardness, high toughness, and high strength that can not be considered as a starting material of a conventional sintered alloy that is excellent, and that can achieve a long life, and a method for producing the same. It is.
【００１１】[0011]
【課題を解決するための手段】本発明者らは、長年に亘
り、超硬合金の硬さ、耐摩耗性を低下させずに、強度，
靭性，耐欠損性を向上させるための検討を行っていた
所、板状ＷＣ結晶を含有した超硬合金にするとその目的
が達成される傾向にあること、この超硬合金を得るため
には、用いる出発物質が従来用いられたことのないＷと
ＣとＣｏの複合炭化物にしておくと達成されるという知
見を得て、本発明を完成するに至ったものである。Means for Solving the Problems For many years, the present inventors have studied the strength and strength of a cemented carbide without reducing its hardness and wear resistance.
While studies were being conducted to improve toughness and fracture resistance, it was found that a cemented carbide containing a plate-like WC crystal would tend to achieve its purpose. In order to obtain this cemented carbide, The inventors have found that this can be achieved by using a composite carbide of W, C and Co, which has not been used as a starting material, and have completed the present invention.
【００１２】すなわち、本発明の粉末冶金用組成物は、
Ｗと炭素とＣｏ，Ｎｉ，Ｃｒの１種以上でなる複合炭化
物粉末を含有していることを特徴とするものである。こ
の複合炭化物粉末を構成しているＷと炭素とＣｏ，Ｎ
ｉ，Ｃｒの１種以上とのそれぞれの比率は、Ｗが７０〜
９０重量％と炭素が０．５〜３．０重量％と残りがＣ
ｏ，Ｎｉ，Ｃｒの１種以上とでなる場合が好ましく、特
に、Ｃｏ3Ｗ9Ｃ4，Ｃｏ2Ｗ4Ｃ ，Ｃｏ3Ｗ3Ｃ ，Ｃｏ6Ｗ6
Ｃ ，Ｎｉ2Ｗ4Ｃ，（Ｎｉ，Ｃｒ）2Ｗ4Ｃの中の少なくと
も１種でなる複合炭化物粉末が好ましいものである。That is, the composition for powder metallurgy of the present invention comprises:
Complex carbonization of W, carbon, and at least one of Co, Ni, and Cr
Characterized by containing a material powder. This
And carbon and Co, N constituting the composite carbide powder of
The ratio of each of i and Cr to one or more kinds is W: 70 to
90% by weight, 0.5 to 3.0% by weight of carbon and the balance C
o, Ni, and Cr are preferable.
And CoThreeW9CFour, CoTwoWFourC , CoThreeWThreeC , Co6W6
C , NiTwoWFourC, (Ni, Cr)TwoWFourAt least in C
Is also preferable.
【００１３】この、複合炭化物粉末をそのまま焼結合金
を得るための粉末冶金用組成物として用いることもでき
るが、この場合には得られる焼結合金の組成成分が極端
に限定されることになる。そこで、この複合炭化物粉末
を１０重量％以上と、残りがカーボン，グラファイト，
金属，合金，セラミックスの中の少なくとも１種の焼結
合金形成補足粉末とからなる粉末冶金用組成物にしてお
くことが好ましい。このときの焼結合金形成補足粉末
は、硬質相と結合相とからなる焼結合金の内の硬質相を
形成するための物質および結合相を形成するための物質
の一方または両方を含んでもよく、具体的には、例えば
周期律表の４ａ，５ａ，６ａ族金属の炭化物，窒化物，
酸化物およびこれらの相互固溶体であるＴｉＣ，Ｚｒ
Ｃ，ＨｆＣ，ＴａＣ，ＮｂＣ，ＶＣ，ＷＣ，Ｃｒ3Ｃ2，
Ｍｏ2Ｃ、，ＴｉＮ，Ｔｉ（Ｃ，Ｎ），（Ｔｉ，Ｗ）
Ｃ，（Ｔｉ，Ｗ）（Ｃ，Ｎ），（Ｔｉ，Ｔａ，Ｗ）Ｃ，
（Ｔｉ，Ｔａ，Ｗ）（Ｃ，Ｎ），（Ｔｉ，Ｔａ，Ｎｂ，
Ｗ）Ｃ，Ｔｉ（Ｃ，Ｏ），ＴｉＯ 2，Ｔｉ（Ｎ，Ｏ），
Ｔｉ（Ｃ，Ｎ，Ｏ）を代表例とするもの、並びにＣｏ，
Ｎｉ，Ｃｒ，Ｖ，Ｗおよびこれらの相互合金，カーボ
ン，グラファイトの中の少なくとも１種の粉末からなる
ものが特に好ましい。[0013] The composite carbide powder is directly used as a sintered alloy.
Can also be used as a powder metallurgy composition to obtain
However, in this case, the composition of the resulting sintered alloy is extremely
It will be limited to. Therefore, this composite carbide powder
10% by weight or more and the balance is carbon, graphite,
Sintering of at least one of metals, alloys and ceramics
A powder metallurgy composition comprising an alloy forming supplementary powder.
Is preferred. Sintered alloy forming supplementary powder at this time
Is the hard phase of the sintered alloy consisting of the hard phase and the binder phase.
Substances for forming and substances for forming the bonded phase
May be included, specifically, for example, for example,
Carbides, nitrides of metals of groups 4a, 5a and 6a of the periodic table,
Oxides and their mutual solid solutions TiC, Zr
C, HfC, TaC, NbC, VC, WC, CrThreeCTwo,
MoTwoC, TiN, Ti (C, N), (Ti, W)
C, (Ti, W) (C, N), (Ti, Ta, W) C,
(Ti, Ta, W) (C, N), (Ti, Ta, Nb,
W) C, Ti (C, O), TiO Two, Ti (N, O),
Ti (C, N, O) as a typical example, and Co,
Ni, Cr, V, W and their alloys,
Consisting of at least one of graphite and graphite
Are particularly preferred.
【００１４】また、複合炭化物粉末は、焼結時に硬質相
としての主として板状ＷＣ結晶を晶出させるためのもの
であり、一部がＣｏ，Ｎｉ，Ｃｒの１種以上でなる結合
相を形成するためのものであるが、１００％の複合炭化
物粉末とするには製造時の調整に大変シビア性を要求さ
れること、および焼結時における板状ＷＣ結晶の晶出率
を高めるために、複合炭化物粉末１０重量％以上と、残
りＷ，Ｗ2Ｃ，ＷＣの中の少なくとも１種を含み、かつ
全炭素量が０．５〜５．５重量％にある板状ＷＣ形成混
合物からなる粉末冶金用組成物とすることが好ましいこ
とである。この板状ＷＣ形成混合物をそのまま焼結合金
を得るための粉末冶金用組成物として用いることもでき
るが、この場合には得られる焼結合金の組成成分が極端
に限定されることになる。The composite carbide powder is mainly for crystallizing plate-like WC crystals as a hard phase at the time of sintering, and partially forms a binder phase composed of at least one of Co, Ni and Cr. However, in order to obtain 100% composite carbide powder, it is required to have a very severe property for adjustment at the time of production, and to increase the crystallization rate of plate-like WC crystals during sintering, the composite carbide powder 10 wt% or more, powder remaining W, W 2 C, includes at least one in the WC, and the total carbon content is comprised of plate-like WC-forming mixture in the 0.5 to 5.5 wt% It is preferable to use a metallurgical composition. The plate-like WC forming mixture can be used as it is as a powder metallurgical composition for obtaining a sintered alloy, but in this case, the composition components of the obtained sintered alloy are extremely limited.
【００１５】そこで、この板状ＷＣ形成混合物を５０重
量％以上と、残りがカーボン，グラファイト，金属，合
金，セラミックスの中の少なくとも１種の焼結合金形成
補足粉末とからなる粉末冶金用組成物にしておくことが
好ましい。この板状ＷＣ形成混合物が粉末冶金用組成物
全体に対して、５０重量％未満になる場合、または板状
ＷＣ形成混合物全体に対して、複合炭化物粉末が１０重
量％未満になる場合、もしくは板状ＷＣ形成混合物にお
ける全炭素量が０．５重量％未満になると焼結時に金属
Ｗが増加し、逆に全炭素量が５．５重量％を超えて多く
なると非板状ＷＣ結晶が増加するもので、これらすべて
について相対的に、焼結時に板状ＷＣ結晶が低下し、硬
さおよび靭性の向上効果が著しく低下することから、そ
れぞれ粉末冶金用組成物全体に対する板状ＷＣ形成混合
物を５０重量％以上、板状ＷＣ形成混合物全体に対する
複合炭化物粉末を１０重量％以上、板状ＷＣ形成混合物
の全炭素量を０．５〜５．５重量％と定めたものであ
る。Therefore, a composition for powder metallurgy comprising 50% by weight or more of the plate-like WC-forming mixture and the balance of at least one kind of supplementary powder for forming a sintered alloy among carbon, graphite, metals, alloys and ceramics. It is preferable to keep it. When the plate-like WC-forming mixture is less than 50% by weight based on the whole composition for powder metallurgy, or when the composite carbide powder is less than 10% by weight based on the whole plate-like WC-forming mixture, or When the total carbon content of the WC-like mixture is less than 0.5% by weight, metal W increases during sintering, and when the total carbon content exceeds 5.5% by weight, non-plate-like WC crystals increase. In all of these, the plate-like WC crystal is reduced by 50% during the sintering and the effect of improving the hardness and toughness is significantly reduced. At least 10% by weight of the composite carbide powder with respect to the entire plate-like WC-forming mixture, and the total carbon content of the plate-like WC-forming mixture is 0.5 to 5.5% by weight.
【００１６】本発明の粉末冶金用組成物は、従来から行
われている粉体粉末冶金の製造方法、具体的には、気相
混合法，固相混合法，液相混合法による混合と加熱焼成
と混合粉砕の各工程を経て作製することができるが、次
の方法で行うと簡易で、かつ品質管理上においても容易
である。The composition for powder metallurgy of the present invention can be produced by a conventional method for producing powder metallurgy, specifically, mixing and heating by a gas phase mixing method, a solid phase mixing method, or a liquid phase mixing method. Although it can be produced through each step of firing and mixing and pulverization, the following method is simple and easy in quality control.
【００１７】すなわち、本発明の製造方法は、Ｃｏ，Ｃ
ｏ含有化合物，Ｎｉ，Ｎｉ含有化合物，Ｃｒ，Ｃｒ含有
化合物，ＣｏとＮｉとＣｒの２種以上の合金の中の少な
くとも１種のＣｏ，Ｎｉ，Ｃｒ供給粉末と、ＷおよびＷ
含有化合物のＷ供給粉末と、炭素および／または炭素含
有化合物の炭素供給粉末とでなる混合粉末を真空，還元
性ガス，浸炭性ガス，不活性ガスの中の少なくとも１種
の雰囲気中で加熱保持して、Ｗと炭素とＣｏ，Ｎｉ，Ｃ
ｒの１種以上とでなる複合炭化物粉末、もしくは該複合
炭化物粉末１０重量％以上と、残りがＷ，Ｗ2Ｃ，ＷＣ
の中の少なくとも１種を含み、かつ全炭素量が０．５〜
５．５重量％にある板状ＷＣ形成混合物を得る方法であ
る。こうして得た複合炭化物粉末１０重量％以上に、カ
ーボン，グラファイト，金属，合金，セラミックスの中
の少なくとも１種の焼結合金形成補足粉末を加えて混合
し、本発明の組成物とする方法、または板状ＷＣ形成混
合物５０重量％以上に、上述の焼結合金形成補足粉末を
加えて混合し、本発明の組成物とする方法である。That is, the production method of the present invention provides Co, C
o-containing compound, Ni, Ni-containing compound, Cr, Cr-containing compound, at least one Co, Ni, Cr supply powder among two or more alloys of Co, Ni and Cr, and W and W
Mixed powder consisting of the W supply powder of the carbon-containing compound and the carbon supply powder of carbon and / or the carbon-containing compound is heated and held in at least one atmosphere among vacuum, reducing gas, carburizing gas, and inert gas. And W, carbon, Co, Ni, C
r, at least 10% by weight of the composite carbide powder, and W, W 2 C, WC
Containing at least one of the above, and having a total carbon content of 0.5 to
This is a method of obtaining a plate-like WC-forming mixture at 5.5% by weight. A method of adding and mixing at least one kind of supplementary powder for forming a sintered alloy among carbon, graphite, metals, alloys, and ceramics to 10% by weight or more of the composite carbide powder obtained in this manner, and mixing to obtain a composition of the present invention, or This is a method of adding the above-mentioned sintering alloy forming supplementary powder to 50% by weight or more of the plate-like WC forming mixture and mixing the mixture to obtain the composition of the present invention.
【００１８】この本発明の製造方法におけるＣｏ含有化
合物，Ｎｉ含有化合物，Ｗ含有化合物，Ｃｒ含有化合物
は、具体的には、例えばＣｏＯ，Ｃｏ3Ｏ4，ＣｏＣ
Ｏ3，Ｃｏ（ＣＯＯ）2，Ｃｏ（Ｃ5Ｈ7Ｏ2）2のＣｏ含有
化合物、ＮｉＯ，Ｎｉ（ＮＯ3）2のＮｉ含有化合物、Ｗ
Ｏ2，ＷＯ3，Ｈ2ＷＯ3，５（ＮＨ4）2１２ＷＯ3５Ｈ2Ｏ
のＷ含有化合物、Ｃｒ3Ｃ2，Ｃｒ7Ｃ3，Ｃｒ23Ｃ6，Ｃ
ｒ2Ｏ3のＣｒ含有化合物に代表される酸化物，炭化物，
塩，金属有機物を挙げることができ、炭素含有化合物
は、セルロース，澱粉，合成樹脂の粉末を挙げることが
できる。また、Ｃｏ，Ｎｉ，Ｃｒ供給粉末とＷ供給粉末
として、両者の含有化合物、具体的には例えばＣｏＷＯ
4の複合酸化物を用いること、さらには、Ｃｏ，Ｎｉ，
Ｃｒ供給粉末とＷ供給粉末と炭素供給粉末として、Ｈ2
ＷＯ3とＣｏ（ＯＨ）2とコロイド状カーボンとの共沈物
を用いることもできる。これらの中でもＣｏ，Ｎｉ，Ｃ
ｒ供給粉末とＷ供給粉末は、Ｃｏ酸化物，Ｎｉ酸化物，
Ｗ酸化物およびこれらの複合酸化物として用いること、
炭素供給粉末はカーボンおよび／またはグラファイトと
して用いることが高純度および微粒粉のものが得られや
すく、製造工程上の品質管理が容易で、総合的に廉価に
なるので好ましい。The Co-containing compound, Ni-containing compound, W-containing compound and Cr-containing compound in the production method of the present invention are, for example, CoO, Co 3 O 4 , CoC
Co-containing compounds of O 3 , Co (COO) 2 , Co (C 5 H 7 O 2 ) 2 , Ni-containing compounds of NiO, Ni (NO 3 ) 2 , W
O 2 , WO 3 , H 2 WO 3 , 5 (NH 4 ) 2 12WO 3 5H 2 O
W-containing compounds of Cr 3 C 2 , Cr 7 C 3 , Cr 23 C 6 , C
oxides, carbides represented by the Cr-containing compound of r 2 O 3 ,
Salts and metal organic substances can be mentioned, and carbon-containing compounds include cellulose, starch and synthetic resin powder. Further, as a Co, Ni, Cr supply powder and a W supply powder, a compound containing both, for example, CoWO
4, the use of Co, Ni,
H 2 powder as Cr supply powder, W supply powder and carbon supply powder
A coprecipitate of WO 3 , Co (OH) 2 and colloidal carbon can also be used. Among them, Co, Ni, C
The r supply powder and the W supply powder are Co oxide, Ni oxide,
W oxides and composite oxides thereof,
It is preferable to use the carbon supply powder as carbon and / or graphite because high purity and fine powder can be easily obtained, quality control in the production process is easy, and overall cost is low.
【００１９】本発明の製造方法における雰囲気は、非酸
化性であればどのような雰囲気でも良く、加熱するとき
の温度範囲に応じて雰囲気を変えることも好ましいこと
である。具体的な雰囲気は、例えばＨ2，ＣＯ，ＣＨ4，
Ｎ2，Ａｒおよびこれらの混合ガス、または真空状態、
さらには大気を遮断した雰囲気状態を挙げることができ
る。The atmosphere in the production method of the present invention may be any atmosphere as long as it is non-oxidizing, and it is also preferable to change the atmosphere according to the temperature range when heating. The specific atmosphere is, for example, H 2 , CO, CH 4 ,
N 2 , Ar and a mixed gas thereof, or a vacuum state,
Further, there may be mentioned an atmosphere state in which the atmosphere is shut off.
【００２０】本発明の製造方法における加熱は、上述し
たＣｏ，Ｎｉ，Ｃｒ供給粉末とＷ供給粉末と炭素供給粉
末におけるそれぞれの種類，粒径，配合組成，加熱時の
雰囲気により異なるが、８００〜１６００℃が好まし
く、特に複合炭化物粉末の生成率を高めて、かつ粒成長
抑制および硬く固結するのを防止するために９００〜１
４００℃が特に好ましい。The heating in the production method of the present invention varies depending on the type, particle size, composition and composition of the Co, Ni, Cr supply powder, W supply powder and carbon supply powder described above, and the heating atmosphere. 1600 ° C. is preferred. In particular, 900-1 ° C. is used in order to increase the production rate of the composite carbide powder, to suppress the grain growth and to prevent hard compaction.
400 ° C. is particularly preferred.
【００２１】本発明の製造方法における最重要点は、最
終的に得られる組成物の全炭素量が０．５〜５．５重量
％になるように、Ｃｏ，Ｎｉ，Ｃｒ供給粉末とＷ供給粉
末と炭素供給粉末との種類および配合量，加熱時の雰囲
気、加熱温度について調整する必要がある。具体的に
は、例えばＮ2ガス中でＣｏＯとＷＯ3と炭素との混合粉
末を加熱する場合には、酸化物の還元に必要な量の炭素
を追加混合し、逆にＨ2とＣＨ4の混合ガス中で金属Ｃｏ
と金属Ｗと炭素との混合粉末を加熱する場合には、ＣＨ
4ガスによる浸炭量に相当するカーボンを減じて混合す
れば良い。The most important point in the production method of the present invention is that the Co, Ni, Cr supply powder and W supply are used so that the total carbon content of the finally obtained composition is 0.5 to 5.5% by weight. It is necessary to adjust the type and blending amount of the powder and the carbon supply powder, the atmosphere during heating, and the heating temperature. Specifically, for example, when heating a mixed powder of CoO, WO 3 and carbon in N 2 gas, an additional amount of carbon necessary for the reduction of the oxide is additionally mixed, and conversely H 2 and CH 4 Metal Co in a mixed gas of
When heating the mixed powder of metal, metal W and carbon, CH
What is necessary is just to reduce and mix carbon equivalent to the amount of carburization by the four gases.
【００２２】[0022]
【作用】本発明の粉末冶金用組成物は、複合炭化物粉末
および板状ＷＣ形成混合物が加熱焼結反応により焼結合
金中で板状ＷＣ結晶の形成とＣｏ，Ｎｉ，Ｃｒを主成分
とする結合相の形成を行う作用をし、これらの複合炭化
物粉末または板状ＷＣ形成混合物の他に、焼結して目的
の焼結合金の組成成分となるように添加する焼結合金補
足粉末が焼結合金における板状ＷＣ結晶以外の硬質相の
形成作用と結合相量の調整作用となるものである。The composition for powder metallurgy according to the present invention is characterized in that a composite carbide powder and a plate-like WC-forming mixture form a plate-like WC crystal in a sintered alloy by a heat sintering reaction and contain Co, Ni and Cr as main components. It acts to form a binder phase, and in addition to the composite carbide powder or the plate-like WC forming mixture, a sintered alloy supplementary powder to be added so as to sinter and become a desired sintered alloy composition component is sintered. This serves to form a hard phase other than the plate-like WC crystal in the binder gold and to adjust the amount of the binder phase.
【００２３】[0023]
【実施例】市販されている平均粒径１．０μｍのＷ、１
０μｍのＷＯ3、１〜２μｍのＣｏ，Ｎｉ，Ｃｒ3Ｃ2、
（Ｗ，Ｔｉ，Ｔａ）Ｃの複合炭化物（重量比でＷＣ／Ｔ
ｉＣ／ＴａＣ＝５０／２０／３０、ＷＴＴと表中に記
す）、０．１μｍのＣｏＯ、０．０３μｍのＴｉＯ2、
０．５μｍのＣｏＷＯ4および０．０２μｍのカーボン
ブラック（Ｃと表中に記す）の各粉末を用いて、表１に
示す配合組成に秤量し、ステンレス製ポットにアセトン
溶媒と超硬合金製ボールと共に挿入し、１２時間の混合
粉砕後、乾燥して混合粉末を得た。これらの混合粉末を
カーボンボードに挿入し、表１に併記した雰囲気、温度
で１時間加熱・保持して本発明品１〜１３および比較品
１〜４の焼結合金用組成物粉末を得た。[Examples] Commercially available W having an average particle size of 1.0 µm,
0 μm WO 3 , 1-2 μm Co, Ni, Cr 3 C 2 ,
(W, Ti, Ta) C complex carbide (weight ratio WC / T
iC / TaC = 50/20/30, described in the table as WTT), 0.1 μm CoO, 0.03 μm TiO 2 ,
Each powder of 0.5 μm of CoWO 4 and 0.02 μm of carbon black (C and described in the table) was weighed to the composition shown in Table 1, and an acetone solvent and a cemented carbide ball were placed in a stainless steel pot. After mixing and grinding for 12 hours, the mixture was dried to obtain a mixed powder. These mixed powders were inserted into a carbon board, and heated and held at the atmosphere and temperature described in Table 1 for 1 hour to obtain composition powders for sintered alloys of inventive products 1 to 13 and comparative products 1 to 4. .
【００２４】得られた各粉末の全炭素量を測定した後、
Ｘ線回折装置を用いて生成物を同定し、また内部添加法
で組成を定量した。これらの結果を表２に示した。After measuring the total carbon content of each obtained powder,
The product was identified using an X-ray diffractometer and the composition was quantified by the internal addition method. Table 2 shows the results.
【００２５】次に、本発明品１，３，５，６，７，８，
１１，１２，１３および比較品１〜４の各組成物粉末、
上記カーボンブラック，（Ｗ，Ｔｉ，Ｔａ）Ｃ粉末およ
び市販されている平均粒子径１〜２μｍのＴａＣ，ＷＣ
の各粉末を用いて、表３に示す配合組成に秤量し、ステ
ンレス製ポットにアセトン溶媒と超硬合金製ボールと共
に挿入し、４８時間の混合粉砕後、乾燥して混合粉末を
得た。こうして得た混合粉末の効果を調べるために、こ
れらの混合粉末を金型に充填し、２ｔｏｎ／ｃｍ2の加
圧でもって約５．５×９．５×２９ｍｍの圧粉成形体と
し、アルミナとカーボンの繊維からなるシート上に圧粉
成形体を設置し、雰囲気圧力１０-2Ｔｏｒｒの真空中で
表３に併記する温度で１時間加熱・保持して本発明品１
４〜２４および比較品５〜８の超硬合金を得た。Next, the products of the present invention 1, 3, 5, 6, 7, 8,
11, 12, 13 and each of the composition powders of comparative products 1 to 4,
The above carbon black, (W, Ti, Ta) C powder and commercially available TaC, WC having an average particle diameter of 1 to 2 μm.
Each powder was weighed to the composition shown in Table 3 and inserted into a stainless steel pot together with an acetone solvent and a cemented carbide ball, mixed and pulverized for 48 hours, and then dried to obtain a mixed powder. In order to examine the effect of the mixed powder thus obtained, the mixed powder was filled in a mold and pressed into a green compact of about 5.5 × 9.5 × 29 mm by applying a pressure of 2 ton / cm 2. A green compact was placed on a sheet made of carbon fiber and carbon fiber, and heated and maintained at a temperature shown in Table 3 for 1 hour in a vacuum at an atmospheric pressure of 10 -2 Torr.
4 to 24 and comparative products 5 to 8 were obtained.
【００２６】こうして得た超硬合金試料を＃２３０のダ
イヤモンド砥石で湿式研削加工し、４．０×８．０×２
５．０ｍｍの試料を作製して抗折力（ＪＩＳ法）を測定
した。また、試料の一面を１μｍのダイヤモンドペース
トでラップ加工した後、ビッカース硬さ（荷重：２０ｋ
ｇｆ）と破壊靭性値：Ｋ1ｃ（ＩＭ法，荷重：２０ｋｇ
ｆ）を測定した。さらに、ラップ加工面について電子顕
微鏡にて組織写真を撮り、画像処理装置にて全ＷＣの平
均粒子径およびＷＣ粒子の最大径と最小径との比（アス
ペクト比）が２．０以上である板状ＷＣのＷＣ全体に対
する体積割合を求めた。これらの結果を表４に示す。ま
た、上記組織写真により測定したおおよその焼結合金組
成を表３に併記した。The thus-obtained cemented carbide sample was wet-ground with a # 230 diamond grindstone to obtain 4.0 × 8.0 × 2.
A 5.0 mm sample was prepared and the transverse rupture strength (JIS method) was measured. Also, after lapping one side of the sample with a 1 μm diamond paste, Vickers hardness (load: 20 k
gf) and fracture toughness: K 1 c (IM method, load: 20 kg)
f) was measured. Further, a photograph of the structure of the lapping surface is taken with an electron microscope, and the average particle diameter of all WCs and the ratio of the maximum diameter to the minimum diameter (aspect ratio) of WC particles are 2.0 or more by an image processing apparatus. The volume ratio of the shape WC to the whole WC was determined. Table 4 shows the results. Table 3 also shows the approximate sintered alloy composition measured by the above structure photograph.
【００２７】[0027]
【表１】 [Table 1]
【００２８】[0028]
【表２】 [Table 2]
【００２９】[0029]
【表３】 [Table 3]
【００３０】[0030]
【表４】 [Table 4]
【００３１】[0031]
【発明の効果】本発明の粉末冶金用組成物は、これを用
いて焼結合金、特に超硬合金を作製した場合に、従来か
ら用いられている超硬合金用組成物に比べて、板状ＷＣ
結晶の晶出比率が顕著に高く、同一組成成分の超硬合金
で対比した場合に、従来の超硬合金に比べて硬さが１．
２〜１．８ＧＰａ高く、抗折力が０．１〜０．２ＧＰａ
高く、破壊靭性値が０．１〜０．４ＧＰａ高くなるとい
う、従来の超硬合金では達成できないかった同一組成成
分における硬さ，抗折力および破壊靭性値の３特性を向
上させることができるという優れた効果がある。The composition for powder metallurgy according to the present invention can be used to produce a sintered alloy, particularly a cemented carbide, by using a metal plate as compared with a conventionally used cemented carbide composition. WC
The crystallization ratio of the crystals is remarkably high, and when compared with a cemented carbide having the same composition, the hardness is 1.
2 to 1.8 GPa higher, bending strength 0.1 to 0.2 GPa
It is possible to improve the three properties of hardness, transverse rupture strength and fracture toughness of the same composition, which cannot be achieved by the conventional cemented carbide, which is high and the fracture toughness is increased by 0.1 to 0.4 GPa. There is an excellent effect.
【００３２】また、本発明の粉末冶金用組成物製造方法
は、従来の板状ＷＣ結晶を晶出するための組成物の製造
方法に比べて、簡易に製造できること、組成物全体の含
有炭素量の調整が容易であること、製造工程上の品質も
容易であるという効果がある。Further, the method for producing a composition for powder metallurgy according to the present invention can be easily produced as compared with the conventional method for producing a composition for crystallizing plate-like WC crystals, and the carbon content of the entire composition can be improved. There is an effect that the adjustment of the product is easy and the quality in the manufacturing process is also easy.
Claims (8)
でなる複合炭化物粉末を含有しており、超硬合金または
サーメットの出発物質として用いることを特徴とする粉
末冶金用組成物。1. A W carbon and Co, Ni, and contain complex carbide powder consisting of <br/> with one or more Cr, cemented carbide or
A composition for powder metallurgy, which is used as a cermet starting material .
％と炭素０．５〜３．０重量％と残りＣｏ，Ｎｉ，Ｃｒ
の１種以上とからなることを特徴とする請求項１記載の
粉末冶金用組成物。2. The composite carbide powder contains 70 to 90% by weight of W, 0.5 to 3.0% by weight of carbon and the balance Co, Ni, Cr.
The composition for powder metallurgy according to claim 1, comprising at least one of the following.
１０重量％以上と、残りがカーボン，グラファイト，金
属，合金，セラミックスの中の少なくとも１種の焼結合
金形成補足粉末からなることを特徴とする粉末冶金用組
成物。3. A composite carbide powder according to claim 1 or 2, comprising at least 10% by weight, and the balance comprising at least one sintered alloy forming supplementary powder of carbon, graphite, metals, alloys and ceramics. Powder metallurgy composition.
４ａ，５ａ，６ａ族金属の炭化物，窒化物，酸化物およ
びこれらの相互固溶体、並びにＣｏ，Ｎｉ，Ｃｒ，Ｖ，
Ｗおよびこれらの相互合金，カーボン，グラファイトの
中の少なくとも１種の粉末からなることを特徴とする請
求項３記載の粉末冶金用組成物。4. The sintered alloy-forming supplementary powder comprises carbides, nitrides, oxides of metals belonging to groups 4a, 5a and 6a of the periodic table and their mutual solid solutions, as well as Co, Ni, Cr, V,
4. The composition for powder metallurgy according to claim 3, wherein the composition comprises at least one powder selected from the group consisting of W and an alloy thereof, carbon, and graphite.
１０重量％以上と、残りがＷ，Ｗ2Ｃ，ＷＣの中の少な
くとも１種を含み、かつ全炭素量が０．５〜５．５重量
％にある板状ＷＣ形成混合物からなることを特徴とする
粉末冶金用組成物。5. The composite carbide powder according to claim 1 or 2 in an amount of 10% by weight or more and the balance containing at least one of W, W 2 C, and WC, and a total carbon content of 0.5 to 5. A composition for powder metallurgy comprising a plate-like WC-forming mixture at 5% by weight.
重量％以上と、残りがカーボン，グラファイト，金属，
合金，セラミックスの中の少なくとも１種の焼結合金形
成補足粉末からなることを特徴とする粉末冶金用組成
物。6. The plate-like WC-forming mixture 50 according to claim 5.
Weight percent or more and the balance is carbon, graphite, metal,
A composition for powder metallurgy comprising at least one kind of supplementary powder for forming a sintered alloy among alloys and ceramics.
４ａ，５ａ，６ａ族金属の炭化物，窒化物，酸化物およ
びこれらの相互固溶体、並びにＣｏ，Ｎｉ，Ｃｒ，Ｖ，
Ｗおよびこれらの相互合金，カーボン，グラファイトの
中の少なくとも１種の粉末からなることを特徴とする請
求項６記載の粉末冶金用組成物。7. The sintered alloy-forming supplementary powder comprises carbides, nitrides, oxides of metals belonging to groups 4a, 5a and 6a of the periodic table and their mutual solid solutions, as well as Co, Ni, Cr, V,
7. The composition for powder metallurgy according to claim 6, comprising at least one powder selected from the group consisting of W and a mutual alloy thereof, carbon and graphite.
合物，Ｃｒ，Ｃｒ含有化合物，ＣｏとＮｉとＣｒの２種
以上の合金の中の少なくとも１種のＣｏ，Ｎｉ，Ｃｒ供
給粉末と、Ｗおよび／またはＷ含有化合物のＷ供給粉末
と、炭素および／または炭素含有化合物の炭素供給粉末
とでなる混合粉末を真空，還元性ガス，浸炭性ガス，不
活性ガスの中の少なくとも１種の雰囲気中で加熱保持し
て、Ｗと炭素とＣｏ，Ｎｉ，Ｃｒの１種以上とでなる複
合炭化物粉末、もしくは該複合炭化物粉末１０重量％以
上と、残りＷ、Ｗ2Ｃ，ＷＣの中の少なくとも１種を含
み、かつ全炭素量が０．５〜５．５重量％にある板状Ｗ
Ｃ形成混合物とし、超硬合金またはサーメットの出発物
質として用いることを特徴とする粉末冶金用組成物の製
造方法。8. A Co, Co-containing compound, Ni, Ni-containing compound, Cr, Cr-containing compound, at least one Co, Ni, Cr supply powder of at least two alloys of Co, Ni and Cr, A mixed powder comprising a W supply powder of W and / or a W-containing compound and a carbon supply powder of carbon and / or a carbon-containing compound is mixed with at least one of vacuum, reducing gas, carburizing gas, and inert gas. Heating and holding in an atmosphere, a composite carbide powder composed of W and carbon and at least one of Co, Ni, and Cr, or 10% by weight or more of the composite carbide powder and the remaining W, W 2 C, or WC Plate-like W containing at least one kind and having a total carbon content of 0.5 to 5.5% by weight
C-forming mixture , starting material of cemented carbide or cermet
A method for producing a composition for powder metallurgy, wherein the composition is used as a material.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6064565A JP2978052B2 (en) | 1994-03-07 | 1994-03-07 | Composition for powder metallurgy and method for producing the same |
| TW084108233A TW368522B (en) | 1994-03-07 | 1995-08-08 | Plate-crystalline tungsten carbide-containing hard alloy, composition for forming plate-crystalline tungsten carbide and process for preparing said hard alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6064565A JP2978052B2 (en) | 1994-03-07 | 1994-03-07 | Composition for powder metallurgy and method for producing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07242958A JPH07242958A (en) | 1995-09-19 |
| JP2978052B2 true JP2978052B2 (en) | 1999-11-15 |
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ID=13261890
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|---|---|---|---|
| JP6064565A Expired - Fee Related JP2978052B2 (en) | 1994-03-07 | 1994-03-07 | Composition for powder metallurgy and method for producing the same |
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| Country | Link |
|---|---|
| JP (1) | JP2978052B2 (en) |
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| CN1292862C (en) * | 2005-01-12 | 2007-01-03 | 哈尔滨工业大学 | Method for adding carbon nanometer tube adjustable hard alloy carbon content |
| KR102551898B1 (en) * | 2020-07-10 | 2023-07-05 | 베스트알 주식회사 | Metal binder for cemented carbide, manufacturing method thereof, and cemented carbide manufactured using the same |
| CN115815597A (en) * | 2022-10-31 | 2023-03-21 | 成都美奢锐新材料有限公司 | Hard alloy burning-back device and hard alloy burning-back method |
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- 1994-03-07 JP JP6064565A patent/JP2978052B2/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| JPH07242958A (en) | 1995-09-19 |
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