JPH0674176B2 - Whisker composite cubic boron nitride sintered body and manufacturing method thereof - Google Patents
Whisker composite cubic boron nitride sintered body and manufacturing method thereofInfo
- Publication number
- JPH0674176B2 JPH0674176B2 JP2263065A JP26306590A JPH0674176B2 JP H0674176 B2 JPH0674176 B2 JP H0674176B2 JP 2263065 A JP2263065 A JP 2263065A JP 26306590 A JP26306590 A JP 26306590A JP H0674176 B2 JPH0674176 B2 JP H0674176B2
- Authority
- JP
- Japan
- Prior art keywords
- boron nitride
- cubic boron
- whisker
- dispersion
- weight
- 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 - Lifetime
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/58—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides
- C04B35/583—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides based on boron nitride
- C04B35/5831—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides based on boron nitride based on cubic boron nitrides or Wurtzitic boron nitrides, including crystal structure transformation of powder
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明の製造法により製造した本発明のウイスカー複合
窒化硼素焼結体は、通常使用されている立方晶窒化硼素
焼結体と同じ分野において利用される工具材である。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The whisker composite boron nitride sintered body of the present invention manufactured by the manufacturing method of the present invention is used in the same field as a cubic boron nitride sintered body which is usually used. It is a tool material used.
従来工具材として使用されている立方晶窒化硼素焼結体
の製造は、立方晶窒化硼素粉末に結合材とするニッケル
粉末を添加して成る混合物をニッケル粉末が立方晶窒化
硼素粉末に液相焼結する温度にて加熱すると同時に其の
加熱温度に対応する立方晶窒化硼素の安定領域における
圧力にて加圧して立方晶窒化硼素焼結体を生成する方法
であって、一般的に行われている焼結作業は、立方晶窒
化硼素粉末にニッケル粉末を混合して成る混合粉末に窒
化チタン粉末を少量添加した混合物を47,000Kg/cm2以上
の圧力にて加圧すると同時に1,500℃以上の温度にて加
熱して、立方晶窒化硼素焼結体を製造している。The cubic boron nitride sintered body that has been conventionally used as a tool material is manufactured by liquid phase firing a mixture of cubic boron nitride powder and nickel powder as a binder into cubic boron nitride powder. It is a method for producing a cubic boron nitride sintered body by heating at a temperature at which it is heated and at the same time pressurizing at a pressure in a stable region of cubic boron nitride corresponding to the heating temperature. The sintering work is performed by pressing a mixture of cubic boron nitride powder and nickel powder mixed with a small amount of titanium nitride powder at a pressure of 47,000 Kg / cm 2 or more and at a temperature of 1,500 ° C. or more. And heated to produce a cubic boron nitride sintered body.
前項にて説明したように、従来使用されている立方晶窒
化硼素焼結体は、立方晶窒化硼素粉末に結合材とするニ
ッケル粉末を添加した混合物を47,000Kg/cm2以上の圧力
と1,500℃以上の温度とのもとで焼結して得られる立方
晶窒化硼素焼結体である。斯様に高圧高温下で生成した
立方晶窒化硼素焼結体を構成している立方晶窒化硼素粒
子の多数個と結合材であるニッケル粒子の多数個が液相
焼結して生成したニッケル組織とは、夫々に固有の膨張
率を有している。従って、相互に異る膨張度を形成して
おり、従って焼結体を生成した立方晶窒化硼素焼結体の
内部には歪を内蔵している。其の歪を内蔵している立方
晶窒化硼素焼結体を使用して製造した切削工具を用いて
切削作業を行う場合には、其の切削作業時に起る衝撃に
より工具に内蔵している歪が其の工具に大小の亀裂ある
いは大小の欠損を誘発する原因となる。斯様に工具を構
成する立方晶窒化硼素焼結体に内蔵している歪により誘
発される大小の亀裂あるいは大小の欠損の発生を抑制す
る手段が開発されていないことが本発明が解決しようと
する問題点である。As described in the previous section, the cubic boron nitride sintered body that has been conventionally used is a mixture of cubic boron nitride powder and nickel powder as a binder added to the mixture at a pressure of 47,000 Kg / cm 2 or more and 1,500 ° C. It is a cubic boron nitride sintered body obtained by sintering at the above temperature. A nickel structure formed by liquid phase sintering of many cubic boron nitride particles and many nickel particles that are binders that constitute the cubic boron nitride sintered body thus produced under high pressure and high temperature. And have their own expansion rates. Therefore, the expansion degrees differ from each other, and strain is built in the cubic boron nitride sintered body from which the sintered body is formed. When performing cutting work using a cutting tool manufactured using cubic boron nitride sintered body containing the strain, the strain built into the tool due to the impact that occurs during the cutting work. Causes large or small cracks or large or small defects in the tool. The present invention intends to solve the problem that the means for suppressing the generation of large and small cracks or large and small defects induced by strain contained in the cubic boron nitride sintered body constituting the tool has not been developed. It is a problem to do.
前項にて説明したように、問題点を解決するために主材
とする立方晶窒化硼素粉末と焼結助材として選択した金
属粉末金属の粉末との混合粉末に各種硬質物ウイスカー
のうちより分散複合材として選択した硬質物ウイスカー
の単繊維集合体の集合物に分散複合助材とする立方晶窒
化硼素微粉末を加えた混合物を水またはメチルアルコー
ル等の分散媒の中に投入し機械的運動による撹拌と超音
波振動による撹拌とを行って生成したウイスカー分散混
合液より分散媒を気化させて除いて成るウイスカー分散
混合物を生成し、次いで、其のウイスカー分散混合物を
主材である立方晶窒化硼素粉末とコバルト・ニッケル・
鉄・コバルト系合金・ニッケル系合金・鉄系合金のうち
より焼結助材として選択した金属の粉末との混合粉末
に、加えて混合した混合物を焼結用原料とし、其の焼結
用原料を46,000Kg/cm2以上の圧力と1,480℃以上の温度
とより立方晶窒化硼素の安定条件を満足する圧力と温度
として選定した焼結用圧力と焼結用温度とにて加圧加熱
して硬質物ウイスカーの単繊維の多数個を分散結合した
立方晶窒化硼素焼結体を生成することによって、立方晶
窒化硼素焼結体の内部に内蔵している歪にともなう脆性
にもとづく大小の亀裂あるいは大小の欠損が発生する現
象を抑制して、問題点を解決しようとするものである。As explained in the previous section, in order to solve the problem, the cubic boron nitride powder used as the main material and the metal powder selected as the sintering aid are dispersed in the mixed powder of the metal powder among various hard material whiskers. Mechanical movement of a mixture of fine fiber whisker single-fiber aggregates selected as a composite material and cubic boron nitride fine powder as a dispersion composite auxiliary material was added into a dispersion medium such as water or methyl alcohol. To produce a whisker dispersion mixture obtained by evaporating and removing the dispersion medium from the whisker dispersion mixture liquid produced by stirring with the use of ultrasonic vibration and stirring with ultrasonic vibration, and then forming the whisker dispersion mixture with cubic nitriding as the main material. Boron powder and cobalt nickel
A mixture of a powder of a metal selected as a sintering aid from among iron / cobalt-based alloys / nickel-based alloys / iron-based alloys and a mixture of these powders is used as a sintering raw material. Is heated at a pressure of 46,000 Kg / cm 2 or more, a temperature of 1,480 ° C. or more, and a pressure and temperature that satisfy the stability conditions of cubic boron nitride, and the selected sintering pressure and temperature. By producing a cubic boron nitride sintered body in which a large number of single fibers of hard whiskers are dispersed and bonded, large or small cracks due to brittleness due to strain contained in the cubic boron nitride sintered body or It aims to solve the problems by suppressing the occurrence of large and small defects.
高い抗張力を有する炭化珪素ウイスカーまたは窒化珪素
ウイスカー等の硬質物ウイスカーのうちより分散複合材
として選択した硬質物ウイスカーの単繊維集合体の集合
物と立方晶窒化硼素微粉末と、を混合した混合物を極性
の高い水またはメチルアルコール等の分散媒の中に投入
し機械的運動による撹拌と超音波振動による撹拌とを行
ってウイスカー分散混合液を生成し、次いで其の生成し
たウイスカー分散混合液より分散媒を気化させて除いて
ウイスカー分散混合物を生成し、次いで其のウイスカー
分散混合物に、立方晶窒化硼素粉末とコバルト・ニッケ
ル・鉄・コバルト系合金・ニッケル系合金・鉄系合金の
うちより焼結助材として選択した金属の粉末との混合粉
末を加えて混合した混合物を焼結用原料とし、其の焼結
用原料を高温高圧発生装置を使用して46,000Kg/cm2以上
の圧力と1,480℃以上の温度とより立方晶窒化硼素の安
定条件を満足する圧力と温度として選定した焼結用圧力
と焼結用温度のもとにて加圧加熱して、硬質物ウイスカ
ー単繊維の多数個と立方晶窒化硼素微粒子の多数個と立
方晶窒化硼素粒子の多数個との混合体における個々の硬
質物ウイスカー単繊維および個々の立方晶窒化硼素微粒
子および個々の立方晶窒化硼素粒子が焼結助材金属粉末
の溶融体の作用により相互に結合して形成した結合体の
中の隙間に焼結助材金属粉末の溶融体が充填して成る液
相焼結体を生成し、次いで加えていた圧力は保持したま
まで加熱のみを停止し、更に冷却して固相焼結体を生成
し、次いで保持していた圧力を常圧にもどし、次いで生
成した固相焼結体を高温高圧発生装置より取り出す。得
られる固相焼結体は複合焼結組織体を構成しているウイ
スカー複合窒化硼素焼結体である。斯様にして生成した
ウイスカー複合立方晶窒化硼素焼結体は高圧力と高温と
のもとで行われた焼結作業において生成した焼結体であ
り、且つ其の焼結体であるウイスカー複合立方晶窒化硼
素焼結体を構成している主材である立方晶窒化硼素粒子
の多数個と分散複合材である硬質物ウイスカー単繊維の
多数個と分散複合助材である立方晶窒化硼素微粒子の多
数個と焼結助材である金属粉末の金属焼結組織とは夫々
に固有の膨張率を有していることによって其のウイスカ
ー複合立方晶窒化硼素焼結体の内部には歪を内蔵してい
る。其のウイスカー複合立方晶窒化硼素焼結体の内部に
は硬質物ウイスカー単繊維の多数個が分散結合してお
り、其のウイスカー複合立方晶窒化硼素焼結体を使用し
て製作した切削工具等を用いて切削作業等を行う場合に
切削工具を形成しているウイスカー複合立方晶窒化硼素
焼結体が受ける衝撃が其の焼結体の内部に内蔵している
歪を原因とする大小の亀裂あるいは大小の欠損が誘発す
ることを其の切削工具を形成している焼結体の内部に分
散結合している硬質物ウイスカー単繊維の多数個が抑制
する作用を発揮することとなる。A mixture of a single fiber aggregate of hard whiskers selected as a dispersion composite material out of hard carbide whiskers such as silicon carbide whiskers or silicon nitride whiskers having high tensile strength and cubic boron nitride fine powder is mixed. Disperse into a dispersion medium such as water or methyl alcohol with high polarity, stirring by mechanical movement and stirring by ultrasonic vibration to generate a whisker dispersion mixture, and then dispersing from the generated whisker dispersion mixture. The medium is vaporized and removed to form a whisker dispersion mixture, and then the whisker dispersion mixture is sintered from cubic boron nitride powder and cobalt / nickel / iron / cobalt-based alloy / nickel-based alloy / iron-based alloy. The mixture obtained by adding and mixing the mixed powder with the metal powder selected as an auxiliary material is used as the sintering raw material, and the sintering raw material is used at high temperature and high pressure. Original using the raw device 46,000Kg / cm 2 or more pressure and 1,480 ° C. or higher temperature and more cubic sintering pressure is selected as a pressure and temperature that satisfies the stability condition of the boron nitride and the sintering temperature In a mixture of a large number of hard whisker single fibers, a large number of cubic boron nitride fine particles and a large number of cubic boron nitride particles, individual hard whisker single fibers and individual cubics Crystalline boron nitride fine particles and individual cubic boron nitride particles are bonded to each other by the action of the melt of the sintering aid metal powder, and the space between them is filled with the melt of the sintering aid metal powder. To produce a liquid-phase sintered body, then stop heating only while maintaining the applied pressure, cool it further to produce a solid-phase sintered body, and then maintain the retained pressure at normal pressure. Then, return the solid-phase sintered body that was generated next to the high-temperature and high-pressure generator. Put out Ri. The obtained solid-phase sintered body is a whisker composite boron nitride sintered body forming a composite sintered structure. The whisker composite cubic boron nitride sintered body thus produced is a sintered body produced in a sintering operation performed under high pressure and high temperature, and the whisker composite which is the sintered body. A large number of cubic boron nitride particles, which are the main material constituting the cubic boron nitride sintered body, a plurality of hard whisker single fibers, which are a dispersion composite material, and cubic boron nitride fine particles, which are a dispersion composite auxiliary material. Since many of them and the metal sintering structure of the metal powder which is the sintering aid have their own specific expansion coefficients, strain is built in the whisker composite cubic boron nitride sintered body. is doing. A large number of hard whisker monofilaments are dispersed and bonded inside the whisker composite cubic boron nitride sintered body, and a cutting tool manufactured using the whisker composite cubic boron nitride sintered body, etc. When a whisker composite cubic boron nitride sintered body forming a cutting tool is subjected to a cutting operation, etc., the impact received by the sintered body is large and small cracks caused by the strain contained inside the sintered body. Alternatively, the large number of hard whisker single fibers dispersedly bonded inside the sintered body forming the cutting tool exerts an action of suppressing the induction of large and small defects.
実施例 1. 分散混合材とする炭化珪素ウイスカーの単繊維集合体の
集合物を60重量％と分散複合助材とする立方晶窒化硼素
微粉末を40重量％との割合にて混合した混合物を、極性
の高い分散媒である水の中に投入し機械的運動による撹
拌と超音波振動による撹拌とを行ってウイスカー分散混
合液を生成し、次いで其のウイスカー分散混合液を加熱
して水を気化させて除いてウイスカー分散混合物を生成
した。次いで其のウイスカー分散混合物を４重量％と立
方晶窒化硼素粉末を91重量％と焼結助材とするニッケル
粉末を５重量％と、の割合にて混合した混合物を焼結用
原料とした。次いで配合した焼結用原料を高温高圧発生
装置を使用して48,500Kg/cm2の圧力にて加圧すると同時
に1,550℃の温度にて加熱して焼結体を生成し、次いで
加えていた圧力は保持したままで加熱のみを停止し、更
に外部より冷却して、其の高温高圧発生室内の温度が30
0℃にまで降温した後に保持していた圧力を常圧にもど
して生成した焼結体を高温高圧発生室内より取り出し
た。得た焼結体は、立方晶窒化硼素粒子の多数個と分散
複合材とした炭化珪素ウイスカー単繊維の多数個と分散
複合助材とした立方晶窒化硼素微粒子の多数個とが焼結
助材である金属粉末の溶融体の作用により相互に結合し
て形成した結合体の中の隙間に焼結助材金属であるニッ
ケル粉末の溶融体が充填して液相焼結して液相焼結体を
生成し、次いで加えていた圧力は保持したままで加熱の
みを停止し、更に外部より冷却して固相焼結体を生成
し、次いで保持していた圧力を常圧にもどして複合焼結
組織体を構成したウイスカー複合立方晶窒化硼素焼結体
であった。Example 1. A mixture of 60% by weight of an aggregate of single fiber aggregates of silicon carbide whiskers as a dispersion mixture and 40% by weight of cubic boron nitride fine powder as a dispersion composite aid was prepared. , A highly polar dispersion medium is poured into water to perform stirring by mechanical movement and stirring by ultrasonic vibration to generate a whisker dispersion mixed solution, and then the whisker dispersion mixed solution is heated to remove water. It was vaporized and removed to produce a whisker dispersion mixture. Then, a mixture of the whisker dispersion mixture of 4% by weight, cubic boron nitride powder of 91% by weight, and nickel powder of 5% by weight as a sintering aid was used as a raw material for sintering. Next, the mixed raw materials for sintering are pressurized at a pressure of 48,500 Kg / cm 2 using a high temperature and high pressure generator, and at the same time heated at a temperature of 1,550 ° C to produce a sintered body, and then the pressure applied. Is stopped, only heating is stopped, and then it is cooled from the outside, and the temperature inside the high temperature and high pressure generation chamber is reduced to 30
After the temperature was lowered to 0 ° C., the pressure held was returned to normal pressure, and the produced sintered body was taken out from the high temperature / high pressure generation chamber. The obtained sintered body was composed of a large number of cubic boron nitride particles, a large number of silicon carbide whisker single fibers as a dispersion composite material, and a large number of cubic boron nitride fine particles as a dispersion composite material. The melt of the nickel powder, which is the sintering aid metal, is filled in the gaps in the joint formed by the action of the melt of the metal powder that is the A solid body is produced, and then only the heating is stopped while the applied pressure is maintained, and further, it is cooled from the outside to produce a solid phase sintered body, and then the retained pressure is returned to normal pressure to carry out composite firing. It was a whisker composite cubic boron nitride sintered body that constituted the texture.
実施例 2. 分散複合材とする炭化珪素ウイスカーの単繊維集合体の
集合物を50重量％と分散複合助材とする立方晶窒化硼素
微粉末を50重量％との割合にて混合した混合物を、極性
の高い分散媒である水の中に投入し機械的運動による撹
拌と超音波振動による撹拌とを行ってウイスカー分散混
合液を生成し、次いで其のウイスカー分散混合液を加熱
して水を気化させて除いてウイスカー分散混合物を生成
した。次いでウイスカー分散混合物を５重量％と立方晶
窒化硼素粉末を90重量％と焼結助材とするニッケル粉末
を５重量％との割合にて混合した混合物を焼結用原料と
した。次いで、其の配合した焼結用原料を高温高圧発生
装置を使用して48,500Kg/cm2の圧力にて加圧すると同時
に1,550℃の温度にて加熱して焼結体を生成し、次いで
加えていた圧力は保持したままで加熱のみを停止し、更
に外部より冷却して其の高温高圧発生室内の温度が300
℃にまで降温した後に保持していた圧力を常圧にもどし
て生成した焼結体を高温高圧発生室内より取り出した。
得た焼結体は、立方晶窒化硼素粒子の多数個と分散複合
材とした炭化珪素ウイスカー単繊維の多数個と分散複合
助材とした立方晶窒化硼素微粒子の多数個とが焼結助材
としたニッケル粉末の溶融体の作用により相互に結合し
て形成した結合体の中の隙間に焼結助材金属であるニッ
ケル粉末の溶融体が充填して、液相焼結して液相焼結体
を生成し、次いで加えていた圧力は保持したままで加熱
のみを停止し、更に外部より冷却して固相焼結体を生成
し、次いで保持していた圧力を常圧にもどして複合焼結
組織体を構成したウイスカー複合立方晶窒化硼素焼結体
であった。Example 2. A mixture obtained by mixing 50% by weight of an aggregate of single fiber aggregates of silicon carbide whiskers as a dispersion composite and 50% by weight of cubic boron nitride fine powder as a dispersion composite aid. , A highly polar dispersion medium is poured into water to perform stirring by mechanical movement and stirring by ultrasonic vibration to generate a whisker dispersion mixed solution, and then the whisker dispersion mixed solution is heated to remove water. It was vaporized and removed to produce a whisker dispersion mixture. Then, a mixture of 5% by weight of the whisker dispersion mixture, 90% by weight of cubic boron nitride powder and 5% by weight of nickel powder as a sintering aid was used as a sintering raw material. Next, the mixed raw material for sintering is pressurized at a pressure of 48,500 Kg / cm 2 using a high temperature and high pressure generator and simultaneously heated at a temperature of 1,550 ° C. to produce a sintered body, and then added. While maintaining the same pressure, only heating is stopped, and the temperature inside the high-temperature and high-pressure generation chamber is reduced to 300 by cooling from the outside.
After the temperature was lowered to ℃, the pressure held was returned to normal pressure, and the produced sintered body was taken out from the high temperature and high pressure generation chamber.
The obtained sintered body was composed of a large number of cubic boron nitride particles, a large number of silicon carbide whisker single fibers as a dispersion composite material, and a large number of cubic boron nitride fine particles as a dispersion composite material. The molten nickel powder, which is a sintering aid metal, is filled in the gaps in the combined body formed by the action of the molten nickel powder, and the liquid phase sintering and liquid phase firing are performed. A solid body is formed, and then only the heating is stopped while the applied pressure is maintained, further cooling is performed from the outside to form a solid-phase sintered body, and then the maintained pressure is returned to normal pressure to form a composite. It was a whisker composite cubic boron nitride sintered body that constituted the sintered structure.
以上に説明した本発明の製造法によって製造した本発明
のウイスカー複合立方晶窒化硼素焼結体は、立方晶窒化
硼素粒子の多数個と分散複合材とする硬質物ウイスカー
単繊維の多数個と分散複合助材とする立方晶窒化硼素微
粒子の多数個と焼結助材金属粉末の焼結組織とが複合し
て成る複合焼結組織体であって、其の複合焼結組織体を
構成している主材である立方晶窒化硼素粒子と分散複合
材である硬質物ウイスカー単繊維と分散複合助材である
立方晶窒化硼素微粒子と焼結助材である金属粉末の焼結
組織とが夫々に固有の膨張率を有しているので、これら
の構成材をもって成る複合焼結組織体であるウイスカー
複合立方晶窒化硼素焼結体の内部には歪が内蔵されてい
る。斯様なウイスカー複合立方晶窒化硼素焼結体を使用
して製作した工具等を用いた切削作業時には、其の切削
作業時に受ける衝撃によって其の工具を形成しているウ
イスカー複合立方晶窒化硼素焼結体に内蔵されている歪
が大小の亀裂あるいは大小の欠損を誘発しようとするの
であるが、其の焼結体の内部に分散結合している抗張力
の高い硬質物ウイスカー単繊維の多数個が大小の亀裂あ
るいは大小の欠損の発生を抑制する機能を発揮すること
となるので、其の工具の有効利用率を著しく高める効果
を奏することができる。The whisker composite cubic boron nitride sintered body of the present invention produced by the production method of the present invention described above is a dispersion of a large number of cubic boron nitride particles and a large number of hard substance whisker single fibers as a dispersion composite material. A composite sintered structure comprising a large number of cubic boron nitride fine particles as a composite auxiliary and a sintering structure of a sintering aid metal powder, which constitutes the composite sintered structure. The cubic boron nitride particles as the main material, the hard material as the dispersion composite material, the whisker single fibers, the cubic boron nitride fine particles as the dispersion composite auxiliary material, and the sintered structure of the metal powder as the sintering auxiliary material, respectively. Since it has an inherent expansion coefficient, strain is built in the whisker composite cubic boron nitride sintered body which is a composite sintered structure made of these constituent materials. During cutting work using a tool, etc., manufactured using such a whisker composite cubic boron nitride sintered body, the whisker composite cubic boron nitride firing forming the tool by the impact received during the cutting work. The strain contained in the bonded body tries to induce large and small cracks or large and small defects, but many of the high tensile strength hard substance whisker monofilaments dispersedly bonded inside the sintered body are Since the function of suppressing the generation of large and small cracks or large and small defects is exerted, the effect of significantly increasing the effective utilization rate of the tool can be achieved.
Claims (2)
材として選択した硬質物ウイスカーの単繊維集合体の集
合物を60重量％乃至40重量％と、分散複合助材とする立
方晶窒化硼素微粉末を40重量％乃至60重量％と、の割合
範囲内より選定した割合にて混合した混合物を、極性の
高い水またはメチルアルコール等の分散媒の中に投入し
機械的運動による撹拌と超音波振動による撹拌とを行っ
てウイスカー分散混合液を生成し、次いで其のウイスカ
ー分散混合液より分散媒を気化させて除いてウイスカー
分散混合物を生成し、其の生成したウイスカー分散混合
物を20重量％乃至５重量％と、立方晶窒化硼素粉末を74
重量％乃至91重量％と、コバルト・ニッケル・鉄・コバ
ルト系合金・ニッケル系合金・鉄系合金のうちより焼結
助材として選択した金属の粉末を６重量％乃至４重量％
と、の割合範囲内より選定した割合にて混合した混合物
を焼結用原料とし、其の焼結用原料を46,000Kg/cm2以上
の圧力と1,480℃以上の温度とより立方晶窒化硼素の安
定条件を満足する圧力と温度として選定した焼結用圧力
と焼結用温度のもとにて加圧加熱して生成した焼結体に
おいて、立方晶窒化硼素微粒子の多数個および立方晶窒
化硼素粒子の多数個および硬質物ウイスカー単繊維の多
数個が焼結助材金属粉末の溶融体の作用により相互に結
合して形成した結合体の中の隙間に焼結助材金属の溶融
体が充填して液相焼結し次いで固化して複合焼結組織体
を構成していることを特徴とするウイスカー複合立方晶
窒化硼素焼結体1. A cubic boron nitride fine particle as a dispersion composite auxiliary material, comprising 60% by weight to 40% by weight of an aggregate of single fiber aggregates of hard material whiskers selected from among various hard material whiskers as a dispersion composite material. Mix the powder at a ratio selected from the range of 40% to 60% by weight into a dispersion medium such as highly polar water or methyl alcohol, and mix with mechanical stirring and ultrasonic waves. Stirring by vibration is performed to produce a whisker dispersion mixture, and then the dispersion medium is vaporized and removed from the whisker dispersion mixture to produce a whisker dispersion mixture, and the produced whisker dispersion mixture is 20 wt% to 5% by weight and cubic boron nitride powder 74
% To 91% by weight, and 6% to 4% by weight of metal powder selected as a sintering aid from among cobalt, nickel, iron, cobalt alloys, nickel alloys, and iron alloys.
, And a mixture mixed in a ratio selected from the range of the above, is used as a sintering raw material, and the sintering raw material is subjected to a pressure of 46,000 Kg / cm 2 or more and a temperature of 1,480 ° C. or more to produce cubic boron nitride. In the sintered body produced by pressurizing and heating under the pressure and temperature for sintering selected as the pressure and temperature satisfying the stable conditions, a large number of cubic boron nitride fine particles and cubic boron nitride A large number of particles and a large number of hard whisker monofilaments are bonded to each other by the action of the melt of the sintering aid metal powder, and the space in the bonded body is filled with the melt of the sintering aid metal. Whisker composite cubic boron nitride sintered body characterized in that the composite sintered structure is formed by liquid phase sintering, solidification, and solidification.
材として選択した硬質物のウイスカー単繊維集合体の集
合物を60重量％乃至40重量％と、分散複合助材とする立
方晶窒化硼素微粉末を40重量％乃至60重量％と、の割合
範囲内より選定した割合にて混合した混合物を、極性の
高い水またはメチルアルコール等の分散媒の中に投入し
機械的運動による撹拌と超音波振動による撹拌とを行っ
てウイスカー分散混合液を生成し、次いで其のウイスカ
ー分散混合液より分散溶媒を気化させて除いてウイスカ
ー分散混合物を生成し、其の生成したウイスカー分散混
合物を20重量％乃至５重量％と立方晶窒化硼素粉末を74
重量％乃至91重量％と、コバルト・ニッケル・鉄・コバ
ルト系合金・ニッケル系合金・鉄系合金のうちより焼結
助材として選択した金属の粉末を６重量％乃至４重量％
と、の割合範囲内より選定した割合にて混合した混合物
を焼結用原料とし、其の焼結用原料を46,000Kg/cm2以上
の圧力と1,480℃以上の温度とより立方晶窒化硼素の安
定条件を満足する圧力と温度として選定した焼結用圧力
と焼結用温度のもとにて加圧加熱して、硬質物ウイスカ
ー単繊維の多数個と立方晶窒化硼素微粒子の多数個と立
方晶窒化硼素粒子の多数個との混合体における個々の硬
質物ウイスカー単繊維および個々の立方晶窒化硼素微粒
子および個々の立方晶窒化硼素粒子が焼結助材金属粉末
の溶融体の作用により相互に結合して形成した結合体の
中の隙間に焼結助材金属の溶融体が充填して液相焼結し
て液相焼結体を生成し、次いで加えた圧力は保持したま
まで加熱のみを停止し、更に冷却して固相焼結体を生成
し、次いで保持した圧力を常圧にもどして複合焼結組織
体を生成することを特徴とするウイスカー複合立方晶窒
化硼素焼結体の製造法。2. A cubic boron nitride fine particle as a dispersion composite auxiliary material, comprising 60% by weight to 40% by weight of an aggregate of hard substance whisker single fiber aggregates selected from among various hard substance whiskers as a dispersion composite material. Mix the powder at a ratio selected from the range of 40% to 60% by weight into a dispersion medium such as highly polar water or methyl alcohol, and mix with mechanical stirring and ultrasonic waves. Stirring by vibration is performed to produce a whisker dispersion mixture, then the dispersion solvent is vaporized and removed from the whisker dispersion mixture to produce a whisker dispersion mixture, and the produced whisker dispersion mixture is 20 wt% to 5 wt% and cubic boron nitride powder 74
% To 91% by weight, and 6% to 4% by weight of metal powder selected as a sintering aid from among cobalt, nickel, iron, cobalt alloys, nickel alloys, and iron alloys.
, And a mixture mixed in a ratio selected from the range of the above, is used as a sintering raw material, and the sintering raw material is subjected to a pressure of 46,000 Kg / cm 2 or more and a temperature of 1,480 ° C. or more to produce cubic boron nitride. Pressurized and heated under the sintering pressure and temperature selected as the pressure and temperature that satisfy the stability condition, and hard material whisker single fibers and cubic boron nitride fine particles and cubic Individual hard material whisker monofilaments and individual cubic boron nitride fine particles and individual cubic boron nitride particles in a mixture with a large number of cubic boron nitride particles mutually by the action of a melt of sintering aid metal powder. The space in the bonded body formed by bonding is filled with the sintering aid metal melt and liquid-phase sintered to form a liquid-phase sintered body, and then the applied pressure is maintained and only heating is performed. Stop and further cool to produce solid phase sintered body, then hold pressure Preparation of Whisker Composites cubic boron nitride sintered body, characterized in that to return to normal pressure to produce a composite sintered organization.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2263065A JPH0674176B2 (en) | 1990-10-02 | 1990-10-02 | Whisker composite cubic boron nitride sintered body and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2263065A JPH0674176B2 (en) | 1990-10-02 | 1990-10-02 | Whisker composite cubic boron nitride sintered body and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04144966A JPH04144966A (en) | 1992-05-19 |
| JPH0674176B2 true JPH0674176B2 (en) | 1994-09-21 |
Family
ID=17384360
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2263065A Expired - Lifetime JPH0674176B2 (en) | 1990-10-02 | 1990-10-02 | Whisker composite cubic boron nitride sintered body and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0674176B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0699642A3 (en) * | 1994-08-29 | 1996-09-18 | Smith International | Whisker or fiber reinforced polycrystalline cubic boron nitride and diamond |
| GB201002372D0 (en) * | 2010-02-12 | 2010-03-31 | Element Six Production Pty Ltd | A superhard multiphase material and method of using same |
-
1990
- 1990-10-02 JP JP2263065A patent/JPH0674176B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04144966A (en) | 1992-05-19 |
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