JPS60138044A - Composite sintered structural body of cubic boron nitride and cermet and production thereof - Google Patents

Abstract

PURPOSE:To produce a titled composite sintered structural body having excellent hardness, mechanical strength and toughness by mixing cubic BN powder, cermet powder consisting of ceramics and metal and Al powder at a specific ratio and sintering the mixture under adequate conditions. CONSTITUTION:A powder mixture consisting of 40-80wt% cubic BN particle powder, 52-10% cermet particle powder which is a sintered alloy consisting of ceramics of carbide, boride, nitride, silicide, etc. and metal of >=1 kind among Ni, Co, Cr and Si and 8-10% Al particle powder is used as a raw material for sintering. Such powder mixture is subjected to hot press sintering under the conditions of 1,100-1,250 deg.C sintering temp. and 20,000-30,000kg/cm<2> sintering pressure. Then the Al powder melts to fill the gaps among the particles and at the same time the cubic BN particles and the metallic parts of the cermet particles are subjected to liquid phase sintering. The composite sintered structural body consisting of the cubic BN and cermet is thus obtd. at a low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cubic boron nitride cermet composite sintered structure in which a cubic boron nitride powder and a cermet powder are combined to form a sintered structure. The present invention relates to a method of manufacturing a cubic boron nitride cermet composite sintered structure.

The present invention provides a mixed powder obtained by adding a cermet powder consisting of a large number of cermet particles to a cubic boron nitride powder consisting of a large number of cubic boron nitride particles, and further adding an aluminum powder consisting of a large number of aluminum particles. In this method, a cubic boron nitride cermet composite sintered structure is manufactured by using a cubic boron nitride cermet composite sintered structure as a raw material for sintering. A state in which an aluminum bond structure is generated in the gaps between individual particles in an aggregate formed by mixing a large number of aluminum particles, and the aluminum bond structure is bonded to each cubic boron nitride particle and each cermet particle. There is a blade that forms the blade.

The present invention produces a compacted tissue by filling the gaps between the individual particles in an aggregate formed by mixing a large number of cubic boron nitride particles and a large number of cermet particles. The present invention relates to a cubic boron nitride cermet composite sintered structure characterized in that an aluminum sintered structure is sintered into individual cubic boron nitride particles and individual cermet particles to form a sintered structure, In addition, aluminum powder consisting of a large number of aluminum particles is added as a compaction forming material to a mixed powder obtained by adding a cermet powder consisting of a large number of cermet particles to a cubic boron nitride powder consisting of a large number of cubic boron nitride particles. The mixed powder obtained was used as a raw material for sintering, and the raw material for sintering was heated at a sintering temperature selected from within the range of 1,100°C to 1,250°C and 20°C.
000 K9/4 to 30. The present invention relates to a method for manufacturing a cubic boron nitride cermet composite sintered structure, characterized in that the sintering operation is performed by simultaneously exposing the structure to a sintering pressure selected from within the range of OOOK4/cd.

The cermet powder used in manufacturing the cubic boron nitride cermet composite sintered structure of the present invention includes carbide-based cermet powders such as titanium carbide-nickel alloy cermet, zirconium carbide-cobalt alloy cermet, and chromium carbide-nickel alloy. We use carbide cermet powder selected from alloy cermets, molybdenum carbide-cobalt alloy cermets, tungsten carbide-cobalt alloy cermets, etc. For boride cermet powder, we use titanium boride-nickel alloy cermets, Zirconium boride-cobalt alloy cermet, chromium-nickel boride alloy cermet, molybdenum boride-cobalt alloy cermet, tungsten boride-cobalt alloy cermet, etc. are used. The cermet powder used is a nitride cermet powder selected from titanium nitride-nickel alloy cermet, zirconium nitride-cobalt alloy cermet, silicon nitride-cobalt alloy cermet, etc., and the silicide-based cermet powder is titanium silicide. -Nickel alloy cermet/zirconium silicide -cobalt alloy cermet/
A powder of a silicide-based cermet selected from among chromium silicide-nickel alloy cermet, molybdenum silicide-cobalt alloy cermet, tungsten silicide-cobalt alloy cermet, etc. is used.

When manufacturing the cubic boron nitride cermet composite sintered structure of the present invention, a mixed powder in which cermet powder is added to cubic boron nitride powder is mixed with individual cubic boron nitride particles and individual cermet particles in the mixed powder. The raw material for sintering is a mixed powder to which aluminum powder is added that forms a compaction structure that binds particles. The raw material for sintering prepared in this way is used once a month for 20,000 h/cd to 30,000 h.
Sintering pressure within the range of /cd and 1.100℃ to 1
．． When the sintering raw material is simultaneously exposed to a sintering temperature within the range of 250°C, the aluminum powder in the sintering raw material melts and forms a large number of cubic boron nitride particles and cermet particles. The molten aluminum fills the gaps between the individual particles in the aggregate, and the filled molten aluminum slightly melts the surface of the individual cubic boron nitride particles, resulting in liquid phase sintering. At the same time, liquid phase sintering is performed on the metal portion of each cermet particle to form a bonded structure.

As described above, the present invention uses, as a raw material for sintering, a mixed powder obtained by adding aluminum powder to a cubic boron nitride powder and a thermeso powder, and further adding aluminum powder as a compaction structure forming material. The sintering temperature used in the work of sintering raw materials for sintering is 1,100℃ to 1,250℃
The sintering pressure is 20,000 Ky.
/ crl to 30,0OOK9/-, and expose the raw material for sintering for 5 minutes to 30 minutes under the sintering temperature and sintering pressure selected from within such range. This method is characterized in that the sintering operation is performed using The sintering operation according to the method of the invention is as described above.
This is carried out using a sintering pressure of Kt/d or less and a sintering temperature of 1.250° C. or less.

The sintering force 1 temperature used in the process of manufacturing the cubic boron nitride cermet composite sintered structure described above is 1,
The temperature is 250℃ or less, and even if cubic boron nitride particles are exposed for 2 hours at 1,250℃, which is the highest sintering temperature, the cubic crystal structure will not change. There is no hexagonal crystal structure transition, and the cubic crystal structure is maintained during the sintering process. Furthermore, in the case of cermet particles, the eutectic point of the ceramic and metal, which is the sintering starting temperature when the ceramic and metal that produce the cermet are sintered, is significantly higher than 1,250°C. In the process of manufacturing a composite sintered structure (such as cubic boron nitride cermets), the ceramic part and the metal part that make up the cermet particles are not split into two (the structure of the cermet is maintained).

The cubic boron nitride cermet composite sintered structure of the present invention is a sintered body obtained by performing a sintering operation by the method described above, and is a sintered body obtained by performing a sintering operation according to the method described above, and is composed of cubic boron nitride powder forming cubic boron nitride powder. In an aggregate in which a large number of particles are mixed with a large number of cermet particles forming cermet powder, the gaps between the individual particles are filled with aluminum connective tissue, and the aluminum connective tissue is individually Cubic boron nitride cermet (cermet) composite sintered structure characterized by a sintered structure formed by sintering into cubic boron nitride particles and individual cermet particles, which is suitable for use in steel products and other iron-based products. It can be used efficiently as a tool for cutting materials.

The pressurizing and heating device used when performing the work of sintering the sintering raw material by the method of the present invention is a pressurizing and heating device of a general structure conventionally used as a hot press device. This is a hot press device constructed using a piston and cylinder made of tungsten carbide-cobalt sintered alloy.

Conventionally, the ultra-high-pressure, high-temperature generator used to produce cubic boron nitride-based sintered bodies is a belt-type ultra-high-pressure, high-temperature generator, and the equipment costs are high. In addition, the cost of performing sintering work using such equipment is expensive, so the manufacturing cost when producing a sintered body using such equipment is high. be.

When using a hot press device with a commonly used structure used in the method of the present invention, the equipment cost is significantly lower than that of a belt-type ultra-high pressure and high temperature generator. Since the operating cost is also significantly lower, the manufacturing cost is significantly lower in the method of the present invention in which the sintering operation is performed using a hot press apparatus of a conventional structure.

As described above, an object of the present invention is to provide a cubic boron nitride cermet composite sintered structure that can efficiently cut iron-based structures, and also to provide a pressurized heating device using a hot press device with a conventional structure. The purpose of the present invention is to provide an industrially effective method for manufacturing a cubic boron nitride cermet composite sintered structure, which reduces equipment costs, reduces equipment operating costs, and lowers production costs.

Next, the steps and effects of manufacturing the cubic boron nitride cermet composite sintered structure of the present invention by the method of the present invention will be explained using examples.

Example 1 A mixed powder containing 60% by weight of cubic boron nitride powder, 32% by weight of titanium carbide-nickel-chromium alloy cermet powder, and 8% by weight of aluminum powder was used as a raw material for sintering. Fill the container with the raw material for sintering prepared in this way,
The container was loaded into a pressure heating chamber of a hot press device of a commonly used structure. Next, 30゜000 kg/
At the same time as applying crA sintering pressure, the sintering raw material in the container was gradually heated to a sintering temperature of 1,200°C, and the added 30,0. 00 Ko /
cII! Pressure heating was continued for 20 minutes at a pressure of 1,200°C and a temperature of 1,200°C. During this pressure and heating operation, the aluminum powder melts and becomes liquid, and the liquid aluminum is an aggregate made up of a mixture of many cubic boron nitride particles and many titanium carbide-nickel-chromium alloy cermet particles. When liquid-phase sintering is performed by creating a state in which the gaps between the individual particles are filled, and the filled molten aluminum slightly melts the surface of the cubic boron nitride particles, simultaneous coagulation and carbonization occur. The nickel-chromium alloy portion on the surface of the titanium-nickel-chromium alloy cermet particles is subjected to liquid phase sintering to form the entire mixed powder of cubic boron nitride powder, titanium carbide-nickel-chromium alloy cermet powder, and aluminum powder. forms a state in which a liquid phase sintered body is produced.

Next, only heating was stopped while maintaining the applied sintering pressure, and the pressure/heating chamber was cooled with water from the outside to lower the temperature inside the chamber to 300°C. Through this cooling operation under pressure, a compacted structure is formed in the gaps between individual cubic boron nitride particles and individual titanium carbide-nickel-chromium alloy cermet particles in the liquid phase sintered body produced in the previous process. The molten aluminum that had been filled with the liquid solidified into individual cubic boron nitride particles and individual titanium carbide-nickel-chromium alloy cermet particles in a liquid phase sintered state, and the entire solid state sintered body was formed. generate. Next, the sintering pressure that had been maintained was returned to normal pressure, and the sintered body was taken out from the pressure heating chamber. The obtained sintered body is an aggregate consisting of a large number of cubic boron nitride particles and a large number of titanium carbide-nickel-chromium alloy cermet particles, in which aluminum compaction is present in the gaps between the individual particles. Cubic boron nitride titanium nickel carbide is filled with solid aluminum, and its aluminum compact structure is sintered into individual cubic boron nitride particles and individual titanium carbide-disol chromium alloy cermet particles to form a sintered structure. It was a luchrome alloy cermet composite sintered structure. The cubic boron nitride titanium carbide-nickel-chromium alloy cermet composite sintered body produced in this manner is a sintered body having extremely high hardness and strong mechanical strength and toughness. It was an excellent tool material that could efficiently cut steel structures and other iron structures.

Example 2 65% by weight of cubic boron nitride powder and tungsten carbide
A mixed powder obtained by mixing 26% by weight of cobalt alloy cermet powder and 9% by weight of aluminum powder was used as a raw material for sintering. The raw material for sintering prepared in this manner was filled into a container, and the container was loaded into a pressurizing and heating chamber of a hot press device having a structure commonly used.

The work of sintering the raw materials for sintering in the container loaded into the chamber was carried out in the same manner as in Example 1. The sintered body obtained after the sintering process is a mixture of a large number of cubic boron nitride particles and a large number of tungsten carbide-cobalt alloy cermet particles, with aluminum in the gaps between the individual particles. Cubic boron nitride carbide, which is filled with a compact structure, and the aluminum compact structure is sintered into individual cubic boron nitride particles and individual tungsten carbide-cobalt alloy cermet particles to form a sintered structure. It was a tungsten-cobalt alloy cermet composite sintered structure. The cubic boron nitride tungsten carbide-cobalt alloy cermet composite sintered body produced in this manner is a sintered body that has extremely high hardness and strong mechanical strength and toughness, and is similar to steel. It was an excellent tool that could be used to efficiently cut other iron-based structures.

Example 3 A mixed powder obtained by mixing 60% by weight of cubic boron nitride powder, 30% by weight of titanium boride-nickel alloy cermet powder, and 10% by weight of aluminum powder was used as a raw material for sintering. The sintering raw material prepared in this manner was filled into a container, and the container was loaded into a pressurizing and heating chamber of a hot press device having a structure commonly used. The work of sintering the raw materials for sintering in the container loaded into the chamber was carried out in the same manner as in the case of Example 1. The sintered body obtained after the sintering process is a mixture of a large number of cubic boron nitride particles and a large number of titanium boron-nickel alloy cermet particles. A cubic structure filled with aluminum compaction, which is sintered into individual cubic boron nitride particles and individual titanium boron boron alloy particles (samen) to form a sintered structure. It was a crystalline boron nitride titanium boride-nickel alloy cermet composite sintered structure. The cubic boron nitride titanium boride-nickel alloy cermet composite sintered body produced in this manner is a sintered structure with extremely high hardness and strong mechanical strength and toughness, and is similar to steel. It is an excellent tool material that can efficiently cut structures and other iron-based structures.

Example 4 A mixed powder obtained by mixing 65% by weight of cubic boron nitride powder, 25% by weight of chromium boride-nickel alloy cermet powder, and 10% by weight of aluminum powder was used as a raw material for sintering. The raw material for sintering prepared in this manner was filled into a container, and the container was loaded into a pressurizing and heating chamber of a hot press device having a structure commonly used. The work of sintering the raw material for sintering in the container loaded into the chamber was performed in accordance with Example 1.
The work was done in the same way as in the case of. The sintered body obtained after the sintering process is a mixture of a large number of cubic boron nitride particles and a large number of chromium boride-nickel alloy cermet particles. is filled with aluminum compaction, and the aluminum compaction is sintered into individual cubic boron nitride particles and individual chromium-nickel boride alloy particles to form a sintered structure. It was a cubic boron nitride chromium boron boride-nickel alloy cermet composite sintered structure. The cubic boron nitride chromium boron boride-nickel alloy cermet composite sintered body produced in this manner is a sintered body having extremely high hardness and strong mechanical strength and toughness, It is an excellent tool material that can efficiently cut steel structures and other iron-based structures.

Example 5 A mixed powder obtained by mixing 60% by weight of cubic boron nitride powder, 30% by weight of titanium nitride-nickel alloy cermet powder, and 10% by weight of aluminum powder was used as a raw material for sintering. The raw material for sintering prepared in this manner was filled into a container, and the container was loaded into a pressurizing and heating chamber of a hot press device having a structure commonly used. The work of sintering the raw material for sintering in the container loaded into the chamber was performed in accordance with Example 1.
The work was done in the same way as in the case of. The sintered body obtained after the sintering process is a mixture of a large number of cubic boron nitride particles and a large number of titanium nitride-nickel alloy cermet particles. Cubic boron nitride filled with aluminum compaction, which is sintered into individual cubic boron nitride particles and individual titanium nitride-nickel alloy cermet particles to form a sintered structure. It was a titanium nitride-nickel alloy cermet composite sintered structure. The cubic boron nitride titanium boride-nickel alloy cermet composite sintered body produced in this manner is a sintered body having extremely high hardness and strong mechanical strength and toughness, It was an excellent tool that could efficiently cut iron-based structures such as steel structures.

Example 6 A mixed powder obtained by mixing 65% by weight of cubic boron nitride powder, 25% by weight of silicon nitride-nickel alloy cermet powder, and 10% by weight of aluminum powder was used as a raw material for sintering. The raw material for sintering prepared in this manner was filled into a container, and the container was loaded into a pressurizing and heating chamber of a host press device having a structure commonly used. The work of sintering the raw materials for sintering in the container loaded into the chamber was carried out in the same manner as in Example 1. The sintered body obtained after the sintering process is a mixture of a large number of cubic boron nitride particles and a large number of silicon nitride-nickel alloy cermet particles. , is filled with aluminum compaction, and the aluminum compaction is filled with individual cubic boron nitride particles and individual silicon nitride particles.
It was a cubic boron nitride silicon nitride-nickel alloy cermet composite sintered body which was sintered into nickel alloy cermet particles to constitute a sintered body. The cubic boron nitride silicon nitride-nickel alloy cermet composite sintered structure produced in this manner is a sintered structure with extremely high hardness and strong mechanical strength and toughness, and has a steel structure. Efficiency of materialized iron structures.

It was an excellent tool material that cut well.

Example 7 A mixed powder obtained by mixing 60% by weight of cubic boron nitride powder, 30% by weight of titanium silicide-nickel alloy cermet powder, and 10% by weight of aluminum powder was used as a raw material for sintering. The raw material for sintering prepared in this manner was filled into a container, and the container was loaded into a pressurizing and heating chamber of a hot press device having a structure commonly used. The work of sintering the raw material for sintering in the container loaded in the chamber was carried out in Example 1.
The work was done in the same way as in the case of. The sintered body obtained after the sintering process is a mixture of a large number of cubic boron nitride particles and a large number of titanium silicide-nickel alloy cermet particles. A cubic crystal structure in which the gaps are filled with aluminum compaction structure, and the aluminum compaction structure is sintered into individual cubic boron nitride particles and individual titanium-nickel silicide alloy cermet particles to form a sintered structure. It was a boron nitride titanium silicide-nickel alloy cermet composite sintered structure. The cubic boron nitride titanium silicide-nickel alloy cermet composite sintered body produced in this manner is a sintered body having extremely high hardness and strong mechanical strength and toughness,
It is an excellent tool material that can efficiently cut iron-based structures such as steel structures.

Example 8 A mixed powder obtained by mixing 65% by weight of cubic boron nitride powder, 25% by weight of molybdenum silicide-cobalt alloy cermet powder, and 10% by weight of aluminum powder was used as a raw material for sintering. The raw material for sintering prepared in this manner was filled into a container, and the container was loaded into a pressurizing and heating chamber of a hot press device having a structure commonly used.

The work of sintering the raw materials for sintering in the container loaded into the chamber was carried out in the same manner as in Example 1. The sintered body obtained after the sintering operation is a mixture of a large number of cubic boron nitride particles and a large number of molybdenum silicide-cobalt alloy cermet particles.

The gaps between the individual grains in the aggregate are filled with aluminum compaction, which is sintered into the individual cubic boron nitride particles and the individual molybdenum-cobalt silicide alloy cermet particles. The sintered body was a cubic boron nitride molybdenum silicide-cobalt alloy cermet composite sintered body.

The cubic boron nitride molybdenum silicide-cobalt alloy cermet composite sintered structure produced in this manner is a sintered structure that has extremely high hardness and strong mechanical strength and toughness, and is similar to steel. It is an excellent tool material that can efficiently cut iron-based structures.

Claims (6)

[Claims] (1) A large number of cubic boron nitride particles, a ceramic selected from among carbide ceramics, boride ceramics, nitride ceramics, and silicide ceramics, and selected from among nickel, cobalt, chromium, and silicon. In an aggregate formed by mixing a large number of particles of cermet, which is a sintered alloy of one type of metal or two or more types of metals, the gaps between the individual particles are filled with aluminum compaction. A cubic boron nitride cermet composite sintered structure, characterized in that the aluminum sintered structure is sintered into individual cubic boron nitride particles and individual cermet particles to constitute a composite sintered structure. (2) 40% to 80% by weight of cubic boron nitride powder consisting of a large number of cubic boron nitride particles selected from carbide ceramics, boride ceramics, nitride ceramics, and silicide ceramics. 52% to 10% by weight of cermet powder consisting of a large number of particles of cermet, which is a sintered alloy of ceramics and one or more metals selected from nickel, cobalt, chromium, and silicon. The raw material for sintering is a mixed powder in which aluminum powder consisting of a large number of aluminum particles is mixed in a ratio selected from within the ratio range of 8% by weight to 10% by weight, and the raw material for sintering is 1, Sintering temperature selected from the range of 100°C to 1,250°C and 20,0 CIOKf/I:d to 30,000 K9
sintering pressure selected from the pressure within the range of / c, rd,
A method for producing a cubic boron nitride cermet composite sintered structure characterized by simultaneously exposing the structure to a cermet. (3) 40% to 80% by weight of cubic boron nitride powder consisting of a large number of cubic boron nitride particles, titanium carbide cermet, dil-reconium carbide cermet, hafnium carbide cermet, vanadium carbide cermet, Consists of a large number of particles of carbide cermet selected from among niobium carbide cermet, tantalum carbide cermet, chromium carbide cermet, molybdenum carbide cermet, tungsten carbide cermet, boron carbide cermet, silicon carbide cermet, etc. For sintering, a mixed powder is prepared by mixing 52% to 10% by weight of carbide-based cermet powder and 8% to 10% by weight of aluminum powder consisting of a large number of aluminum particles. As a raw material, the raw material for sintering is 1,1
Sintering temperature selected from 00℃ to 1,250℃ and 20,000K9/ad to 30,0OOK9/
A method for producing a cubic boron nitride carbide-based cermet composite sintered structure, which comprises simultaneously exposing it to a sintering pressure selected from within the range of d. (4) 40% to 80% by weight of cubic boron nitride powder consisting of a large number of cubic boron nitride particles, titanium nitride cermet, zirconium nitride cermet, hafnium nitride cermet, vanadium nitride cermet, dinitride Off-type cermet, tantalum nitride cermet, chromium nitride cermet, molybdenum nitride cermet,
Tungsten nitride; 52% to 10% by weight of nitride-based cermet powder selected from among tungsten nitride-based cermets, aluminum nitride-based cermets, silicon nitride-based cermets, etc.
and aluminum powder in a ratio selected from 8% to 10% by weight as a raw material for sintering, and the raw material for sintering is heated at 1,000°C to 1.2% by weight.
Sintering temperature selected from within the range of 50℃ and 20,000℃
A method for producing a cubic boron nitride-based cermet composite sintered structure, characterized by simultaneously exposing it to a sintering pressure selected from within the range of Kq/tri to 30,000 Kg/tri. . (5) 40% to 80% by weight of cubic boron nitride powder consisting of a large number of cubic boron nitride particles and titanium boride cermet, zirconium boride cermet, hafnium boride cermet, vanadium boride cermet・Nobium boride cermet ・Tantalum boride cermet ・Chromium boride cermet ・Molybdenum boride cermet ・
52 powder of boride cermet selected from tungsten boride cermet, silicon boride cermet, etc.
% to 10% by weight and 8% by weight of aluminum powder
A mixed powder mixed in a ratio selected from within the ratio range of 10% by weight is used as a raw material for sintering, and the raw material for sintering is 1% by weight.
Sintering temperature selected from the range of ,000℃ to 1,250℃ and 20,000Ky/tri to 30,00℃
A method for producing a cubic boron nitride-boride cermet composite sintered structure, which comprises simultaneously exposing the structure to a sintering pressure selected from within the range of 0 Kg/cd. (6) 40% to 80% by weight of cubic 3° crystal boron nitride powder consisting of a large number of cubic boron nitride particles, aluminum silicide cermet, titanium silicide cermet, zirconium silicide cermet, hafnium silicide cermet 52% by weight of powder of a silicide cermet selected from vanadium silicide cermet, niobium silicide cermet, tanker silicide cermet, chromium silicide cermet, molybdenum silicide cermet, tungsten silicide cermet, boron silicide cermet, etc. to 10
% by weight and aluminum powder from 8% to 10% by weight.
The raw material for sintering is a mixed powder mixed in a ratio selected from within the ratio range of 1,100°C to 1,250°C, and ．．
00 (1/cd to 30,000 h/ct!t) A cubic boron nitride silicide-based cermet composite sintered structure characterized in that it is simultaneously exposed to a sintering pressure selected from within the range of 00 (1/cd to 30,000 h/ct!t). How the body is manufactured.