JPS59118852A - Composite high speed steel of sintered hard alloy and its production - Google Patents

Abstract

PURPOSE:To produce a composite high speed steel of a sintered hard alloy having high hardness by mixing high speed steel powder and hard alloy powder of carbide, etc. at a specific ratio, adding further Co contg. or Ni contg. heat resistant alloy powder at a specific ratio and sintering the powder. CONSTITUTION:A powder mixture composed of 50-80wt% high speed steel powder, 30-10% hard alloy powder of hard carbide such as Cr3C2, hard nitride such as TiN, hard boride such as ZrB2, hard silicide such as CrSi2, 20-10% powder of Co contg. heat resistant alloy contg. 50-80% Co which assumes a molten state as a sintering temp. of 1,200-1,300 deg.C, or Ni contg. heat resistant alloy contg. 50-90% Ni is used as a raw material for sintering, and is sintered by sintered molding such as sintering after press molding under a sintering condition of 1,200-1,300 deg.C sintering temp. and 0.8-10.0ton/cm<2> sintering pressure. The heat resistant alloy is thus penetrated in the gaps between the porous sintered bodies consisting of the high speed steel particles and hard alloy particles by which the gaps are closed and the composite high speed steel of the sintered hard alloy constituted by binding these particles to bond is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a means for enhancing the performance of sintered high-speed steel produced by sintering high-speed steel powder. Mixed powder with added hard alloy powder, which is hard boride powder or hard silicide powder.

Historically, it has been used as a sintering aid to promote the sintering of the mixed powder.
, 50% to 8% by weight of cobalt which forms a molten state at sintering temperatures in the range of 200°C to 1,600°C.
Powder of cobalt-based heat-resistant alloy containing 0% by weight or powder of nickel-based heat-resistant alloy containing 50% to 90% by weight of nickel, or 50% by weight of cobalt and nickel combined % to 85% by weight: manufactured by using the powder of I Baltic-Ninokel base alloy as the raw material for sintering.
't' relates to a sintered hard alloy composite high speed steel and a method for producing a sintered hard alloy composite high speed steel using the raw material for sintering.

When producing the sintered hard alloy composite high speed steel of the present invention, the hard alloy powder added to the high speed steel powder includes chromium carbide, molybdenum carbide, tungsten carbide, vanadium carbide, niobium carbide, tantalum carbide - titanium carbide, carbide. Powder of a hard alloy that is a hard carbide alloy selected from among zirconium and hafnium carbide, or powder of a hard alloy that is a hard nitride alloy selected from among titanium nitride, zirconium nitride, hafnium nitride, and silicon nitride, or ,
Powder of a hard alloy that is a hard boride alloy selected from titanium dihedral, zirconium dihedral, and hafnium dihedral.

Alternatively, powder of a hard alloy selected from among chromium silicide and molybdenum silicide is used.

The sintering aid is further added to the above-described mixed powder of high-speed steel powder and hard alloy powder.

1,200℃ to 1,300℃ used as sintering temperature
A powder of a cobalt-based heat-resistant alloy, a powder of a nickel-based heat-resistant alloy, or a powder of a cobalt-nickel-based heat-resistant alloy having a melting point of 1,300°C or less, which is the upper limit temperature of 1.3°C, is used.

When producing the sintered hard alloy composite high speed steel of the present invention, the temperature at which the raw material for sintering is sintered is set at 1.200°C to 1.300°C.
℃ to suppress grain growth coarsening of high-speed steel during sintering, and at the same time expose the raw material for sintering to a temperature within the range of 1.200℃ to 1.500℃. In the process of performing sintering work, powder of cobalt-based heat-resistant alloy, powder of nickel-based heat-resistant alloy, or cobalt-based sintering aid is used.
A powder of a nickel-based heat-resistant alloy is characterized in that it generates a molten state and sinters into individual particles in a mixed aggregate of a large number of high-velocity particles and a large number of hard alloy particles. It is.

The cobalt-based heat-resistant alloy powder used as the sintering aid powder contains 50% to 80% by weight of cobalt and has a melting point of 1.300°C or less.2 For example, 68% by weight of cobalt. Tori (-1 person uses powder of cobalt-based heat-resistant alloy such as Stellite 6 with a composition ratio of 26% by weight, 5 parts by weight of tungsten, and 1 part by weight of carbon,
In addition, the nickel-based heat-resistant alloy powder used as the sintering aid powder contains 50% to 90% by weight of nickel and has a melting point of 1.500°C or less. A powder of a nickel-based heat-resistant alloy such as Fukudaloy 4 with a composition ratio of 11% by weight of chromium, 2 parts by weight of boron, 25% by weight of silicon, 2.0 parts by weight of iron, and 0.5% by weight of carbon is used. In addition, the cobalt-nickel based heat-resistant alloy powder used as the sintering aid powder contains 50% to 85% by weight of cobalt and nickel in total.
Cobalt/Kel based heat resistant alloy with a melting point of 1,300°C or below.For example, 41% by weight of cobalt, 26% by weight of nickel, 20% by weight of chromium, 6 parts by weight of boron, and 6 parts by weight of molybdenum. A powder of a cobalt-nickel base heat-resistant alloy such as Fukudaloy I''P-15D is used in a composition ratio of 4 parts by weight to 4 parts by weight of silicon.

As explained above, the sintered hard alloy composite high-speed steel of the present invention is made by adding a mixed powder of high-speed steel powder, hard carbide powder, hard nitride powder, hard boride powder, or hard silicide powder, Furthermore, a sintered structure produced by sintering a mixed powder to which a heat-resistant alloy powder selected from cobalt-based heat-resistant alloy powder, nickel-based heat-resistant alloy powder, or cobalt-nickel-based heat-resistant alloy powder is added. It is a sintered hard alloy composite high speed steel.

The sintered hard alloy composite high-speed steel produced in this manner has significantly higher hardness and higher heat resistance than sintered high-speed steel obtained by sintering only high-speed steel. It is made of sintered steel.

Next, the process and operation of manufacturing a sintered hard alloy composite high speed steel by the method of the present invention will be explained, and the sintered hard alloy composite high speed steel of the present invention obtained by manufacturing will be explained.

The work of manufacturing the sintered hard alloy composite high-speed steel of the present invention will be explained by type of hard alloy used.

When using hard carbide powder as hard alloy powder,
50% to 8% by weight of high-speed steel powder and a hard carbide selected from chromium carbide, molybdenum carbide, tungsten carbide, vanadium carbide, niobium carbide, tantalum carbide, titanium carbide, zirconium carbide, and hafnicum carbide. 40% to 15% by weight of powder and 1.200%
50% by weight of cobalt which forms a molten state at a sintering temperature selected from temperatures in the range of 1°C to 1°C.
9 cobalt-based heat-resistant alloys containing 50% to 80% by weight of nickel; 2 powders of cobalt-based heat-resistant alloys such as Stellite-6; 2 nickel-based heat-resistant alloys containing 50% to 90% nickel; such as Fukudaloy 4, etc. Powders of nickel-based heat-resistant alloys or cobalt-nickel-based heat-resistant alloys containing 50% to 85% by weight of cobalt and nickel in total 1 For example, from powders of cobalt-nickel-based heat-resistant alloys such as Fukuda Koi FP-150. The raw material for sintering is a mixed powder obtained by mixing the powder of the selected heat-resistant alloy in a ratio selected from within the ratio range of 10% by mass to 5% by weight, and the raw material for sintering prepared in this way is 0.8% by mass. ton /
A molded body pressure-molded with a mold at a pressure within the range of crl to 10 ton/crl is heated to 1.200°C to 1.3°C.
Liquid phase sintering is carried out at a temperature within the range of 00°C under normal pressure or in vacuum, or 0.8 ton/crl to 1
A molded body formed by isostatic pressing at a pressure within the range of 0 ton/ca is subjected to liquid phase sintering at a temperature within the range of 1.200°C to 1.500°C under normal pressure or in vacuum, or 08 tons/cTI to 81.
Pressure heating sintering is performed by applying pressure within the range of on/ai and simultaneously heating at a temperature within the range of 1.200°C to 1.300°C.

Or 0.8 ton/crI to 8 ton
Hard carbide powder is produced by hot isostatic pressing at a pressure within the range of /crI and heating at a temperature within the range of 1,200°C to 1,500°C at the same time. Produces composite sintered high speed steel.

When using hard nitride powder as hard alloy powder,
50% to 80% by weight of high-speed steel powder and 30% to 1% by weight of hard nitride powder selected from titanium nitride, zirconium nitride, nitride, and silicon nitride.
0% by weight.

1. Stellite-6 containing 50% to 80% by weight of cobalt which forms a molten state at a selected sintering temperature within the range of 200°C to 1,300°C.
Cobalt-based heat-resistant alloy powder such as Fukudaloy 4 containing 50 to 90 weight percent nickel powder, or cobalt and nickel powder.
Powder of a cobalt-nickel based heat-resistant alloy such as Fukudaloy-15 [1 grade] containing a total of 50% by weight to 85% by weight in a proportion selected from within the ratio range of 20% to 10% by weight. The mixed powder is used as a raw material for sintering, and the raw material for sintering is subjected to liquid phase sintering in the same manner as the sintering method when using the hard carbide powder described above to obtain a hard nitride powder. Produces composite sintered high speed steel.

When using hard boride powder as hard alloy powder,
50% to 80% by weight of high-speed steel powder, 30% to 1% by weight of hard boride powder selected from among titanium dihedral, zirconium difaced, and hanonium difaced, and 1,200% by weight A cobalt-based heat-resistant alloy such as Stellite-6 containing 50% to 80% by weight of cobalt which forms a molten state at a sintering temperature selected from the range of 1,310°C to 1,310°C. Powder size of a nickel-based heat-resistant alloy such as Fukudaloy 4 containing 50 to 90 weight percent of Ni-Nokel is 50 weight T in total with cobalt and nickel. The powder of a heat-resistant alloy selected from among the powders of cobalt-nickel-based heat-resistant alloys such as Fukuda's 5P-150 containing 85% to 85% by weight of heat-resistant alloy powder is within the proportion range of 20% to 10% by weight. A mixed powder mixed in a selected ratio is used as a raw material for sintering, and the raw material for sintering is subjected to liquid phase sintering in the same manner as the sintering method when using the hard carbide powder, Produces sintered high-speed steel composited with hard boride powder.

Lifting platform using hard silicide powder as hard alloy powder-1
．． 50% by weight of high-speed steel powder to 80% by weight: 1;
Cobalt that forms a molten state at a sintering temperature selected from the range of 0'C to 1,310'C is
A powder of a cobalt-based heat-resistant alloy such as Stellite-6 containing 0 to 80% by weight, or a powder of a nickel-based heat-resistant alloy such as Fukudaloy 4 containing 50 to 90% by weight of nickel; The proportion of cobalt-nickel based heat-resistant alloy powder such as Nokdaloy FP-150 containing 50% to 85% by weight of cobalt and nickel in total is selected within the range of 20% to 10% by weight. The mixed powder mixed in step 1 is used as a raw material for sintering, and the raw material for sintering is subjected to liquid phase sintering in the same manner as the sintering method when using the hard carbide powder described above to obtain a hard silicide. Produces sintered high-speed steel composited with powder.

Sintered hard carbide composite high speed steel or sintered hard nitride composite high speed steel or sintered hard boride composite high speed steel or sintered hard silicide composite high speed steel d that is KOed by the manufacturing operations described below. : a large number of high speed steel particles and a large number of hard carbide particles, or a large number of high speed steel particles and a large number of hard nitride particles, or a large number of high speed steel particles and a large number of hard boride nucleons. In the gaps between individual particles in a porous composite sintered body in which a mixed powder of a large number of high-speed steel particles and a large number of hard silicide particles is sintered. , cobalt-based jβJ1 alloy size or nickel-based surface]
The alloy structure is filled with a spongy structure consisting of a thermal alloy or a Kobal i-nickel based heat-resistant alloy, and the spongy structure of the alloy structure is bonded to one individual high-speed steel particle and one individual hard alloy particle. It is a sintered hard alloy composite high speed steel that has a sintered composite structure.

Next, the process for producing a sintered hard alloy composite high speed steel by the method of "2 Unexploded IJ" and the sintered hard alloy composite high speed steel of the present invention obtained by manufacturing will be explained.

Example 1 The base material for bonding 1ε contains 4 layers of chromium, 6 weight percent of tungsten, 5 weight percent of molybdenum, 2 weight percent of vanadium, and 0.8 weight percent of silicon manufactured by Mitsubishi Steel Rod Manufacturing. carbon is 11
80% by weight of high-speed steel powder, 10% by weight of tungsten carbide powder, and 70% by weight of cobalt manufactured by Fukuda Metal Foil and Powder Co., Ltd., with a composition ratio of 81.1% by weight and iron. %, nickel is 2% by weight, chromium is 19% by weight, tungsten is 5% by weight, boron is 25% by weight, and silicon is 1.5%.
A mixed powder was used in which powder of Fukudaloy 160, which is a cobalt-based heat-resistant alloy, was mixed in a composition ratio of 10% by weight with respect to the weight ratio. The raw material for sintering thus prepared was subjected to a cold isostatic press at a pressure of 8 tons/al to produce a molded body. The molded body is heated in vacuum for 1 or 2 hours.
Liquid phase sintering was performed by heating to 30° C., followed by cooling in vacuum to produce a solid phase sintered body. The obtained sintered body is a porous sintered body in which a large number of high-speed steel particles and a large number of tungsten carbide particles are mixed and sintered, and a cobalt group is added to the gaps between the individual particles. It is filled with a spongy alloy structure made of Fukudaloy 160, a heat-resistant alloy, and the spongy alloy structure is bonded to individual high-speed steel particles and individual tungsten carbide particles to form a sintered composite structure. It consists of sintered carbide tank stainless steel composite high speed steel and sintered hard alloy composite high speed steel.

Example 2 The raw materials for sintering were 75 tons of the same powder as the high-speed t (i-phrase powder) used in Example 1, and 1 ton of tantalum carbide powder.
A mixed powder was used in which 4% by weight and 11% by weight of Futadaloy 160 powder, which is the same powder as the thermal alloy powder used in Example 1, were mixed. A sintered body prepared in this way was produced using the 7'iJαIJ, sintering method, and the 9 operations were carried out in the same manner as in Example 1. 71. The sintered body is a porous sintered body in which a large number of high-speed steel particles and a large number of tantalum carbide particles are mixed and sintered, and a cobalt-based thermal alloy is injected into the gaps between the individual particles. A GaJJ consisting of 160 Nokdaroi
Is it filled with a cotton-like alloy structure? A sintered hard alloy composite consisting of a sintered carbide tanker composite high speed steel in which an alloy structure with a cotton-like structure is bonded to individual high speed steel particles and individual tantalum carbide particles to form a sintered composite structure. It was high speed steel.

Example 3 The raw materials for sintering included 70% by weight of the same powder as the high-speed steel powder used in Example 1 and 17% by weight of molybdenum disilicide powder.
73% by weight of Fukuda metal foil powder, 1% by weight of nickel, 14% by weight of chromium, 4% by weight of iron, 05% by weight of carbon, and 6% by weight of boron. A mixed powder was used in which powder of Fukudaloy Otsu, a nickel-based heat-resistant alloy with a composition ratio of 45% by weight and silicon, was mixed at a ratio of 16% by weight.The raw material for sintering prepared in this way was A molded body was produced using a pressure of 10 ton/ctrr in a mold using a mechanical press/ξ.

Next, the molded body was heated in vacuum at a temperature of 1.220° C. to perform liquid phase sintering, and then cooled in vacuum under Ua to produce a solid phase sintered body. The obtained sintered body is a porous sintered body in which a large number of high-speed steel particles and a large number of molybdenum disilicide particles are mixed and sintered. It is filled with a spongy alloy structure made of the alloy Fukudaloy-6, and its sea B
sintered molybdenum disilicide composite high-speed steel in which the alloy microstructure of the :-like structure is bonded to individual high-speed steel particles and individual molybdenum disilicide particles to form a sintered composite structure. It was a hard alloy composite III'III speed steel.

Example 4 The raw materials for sintering included 65% by weight of the same powder as the high-speed steel powder used in Example 1, 20% by weight of silicon nitride powder, and the cobalt-based heat used in Example 1. A mixed powder was used in which Fukudaloy-160 powder, which is the same powder as the alloy powder, was mixed at a ratio of 15% by weight.

The raw material for sintering thus prepared was molded into a mold using a mechanical press at a pressure of 10 ton/crl to form a molded body. Next, the molded body was heated to 1,230°C in a vacuum.
Liquid phase sintering is performed by heating at a temperature of .

Subsequently, it was cooled in vacuum to produce a solid-phase sintered body.

The obtained sintered body is a porous sintered body in which a large number of high-speed steel particles and a large number of silicon nitride particles are mixed and sintered, and a cobalt-based heat-resistant alloy is placed in the gaps between the individual particles. It is filled with a spongy alloy structure consisting of Fukudaloy 160, which is a carbon fiber alloy, and the spongy alloy structure bonds to individual high-speed steel particles and individual silicon nitride particles to form a sintered composite structure. It was a sintered hard alloy composite high speed steel consisting of a sintered silicon nitride composite high speed steel.

Example 5 The raw materials for sintering included 60% by weight of the same powder as the high-speed steel powder used in Example 1, 24% by weight of titanium dihedral powder, and the nickel used in Example 6. A mixed powder containing 16% by weight of powder of Fukudaloy Otsu, which is a basic heat-resistant alloy, was used. Kyoto material for sintering prepared in this way.

A molded body was produced by a mechanical press using a pressure of 10 ton/arH in a mold. Next, the molded body is heated at a temperature of 1.250°C in a hydrogen gas atmosphere to perform liquid phase sintering, and then cooled in a hydrogen gas atmosphere to form a solid phase sintered body. generated.

The obtained sintered body is a porous sintered body in which a large number of high-speed steel particles and a large number of dihedralized butane particles are mixed and sintered, and nickel base is added to the gaps between the individual particles. It is filled with a spongy-structured alloy structure consisting of Fukudaloy-6, which is a thermal alloy, and the spongy-structured alloy structure is bonded to individual high-speed steel grains and individual titanium 2411 grains. This was a sintered hard alloy composite high speed steel made of a sintered titanium composite high speed steel comprising a sintered composite structure.

Example 6 The raw materials for sintering contained 55% by weight of the same powder as the high-speed steel powder used in Example 1 and 27% by weight of titanium nitride powder.
A mixed powder was used in which powder of Fukudaloy-150, which is a cobalt-nickel based heat-resistant alloy used in Example 4, was mixed at a ratio of 18% by weight. The raw material for sintering thus prepared was heated to 8 ton/c using a hot press.
Liquid phase sintering was performed by applying a pressure of rl and simultaneously heating at a temperature of 1.220° C., and then the hot press was cooled from the outside to produce a solid phase sintered body.

The obtained sintered body is a porous sintered body in which a large number of high-speed steel particles and a large number of titanium nitride particles are mixed and sintered, and a heat-resistant cobalt-nickel base is added to the gaps between the individual particles. It is filled with a spongy-structured alloy structure made of Fukudaloy 150, which is an alloy, and the spongy-structured alloy structure binds to individual high-speed steel particles and individual titanium nitride particles to form a sintered composite structure. It was composed of sintered titanium nitride composite high speed steel and sintered hard alloy composite high speed steel.

Example Z The raw materials for sintering include 50% by weight of the same powder as the high-speed steel powder used in Example 1, 60% by weight of titanium carbide powder, and the nickel-based heat-resistant powder used in Example 3. A mixed powder obtained by mixing powder of Fukudaloy-6, which is an alloy, at a ratio of 20% by weight was used. The raw material for sintering thus prepared was heated to 8 ton/cr using a hot isostatic pressure heating device.
1.220℃ at the same time as hydrostatic pressurization using a pressure of 1.220℃
No l! Liquid phase sintering is performed by heating at i'□ degrees and hot isostatic pressing, followed by cooling the hot isostatic pressing and heating device 5 from the outside to form a solid phase sintered body. was generated. The obtained sintered body is made by mixing and sintering a large number of high-speed steel particles and a large number of titanium carbide particles/6.Nickel base is added to the gaps between the individual particles in the porous sintered body. It is filled with a spongy alloy structure consisting of Fukudaloy 6, which is a J-plane thermal alloy, and the jσ spongy structure is bonded to individual high-speed steel particles and individual titanium carbide particles. This was a sintered hard alloy composite high-speed steel consisting of a sintered titanium carbide composite high-speed steel that constituted a sintered composite structure.

The sintered hard alloy composite high-speed steel produced in the examples described above exhibits a hardness of HV870 to HV940 up to the point of sintering, and the sintered hard alloy composite high-speed steel obtained by sintering it When it was tempered at a temperature of 570°C, it showed HV930 to HVj, 02Q. The sintered high-speed steel obtained by sintering only the high-speed steel powder used in the examples showed an HV of 680 in the sintering stage, and an HV of 790 when the sintered body was tempered at a temperature of 570°C. Indicated.

Claims (5)

[Claims] (1) 50% to 80% by weight of high-speed steel powder and a hard carbide selected from chromium carbide, molybdenum carbide, tungsten carbide, vanadium carbide, niobium carbide, tantalum carbide, titanium carbide, zirconium carbide, and hafnium carbide. powder and titanium nitride, zirconium nitride,
Selected hard nitride powders such as hafnium nitride and silicon nitride, as well as titanium boride, zirconium boride, and
60% to 10% by weight of a hard boride powder selected from hafnium boride and a hard silicide powder selected from monochromium silicide and monomolybdenum silicide; 200℃~1.3D
A cobalt-based thermal alloy containing 50% to 80% by weight of cobalt or 50% to 90% by weight of nickel that produces a molten state under the selected sintering temperature within the range of D'C. Nickel-based heat-resistant alloy containing 50% to 8% by weight of cobalt and nickel combined
Among the cobalt-nickel base heat-resistant alloys containing 5% by weight, 20% by weight to 10% by weight of selected heat-resistant alloy powders are added.
A mixed powder mixed in a ratio selected from within the range of weight% is used as the raw material for sintering. The sintering temperature used in the work of sintering the sintering raw material is 1,200℃ to 1,300℃, and the sintering pressure is 0.8ton/cr& to 10.0℃.
Using j-On/C21 pressure, the sintering method is
The sintering raw material is pressed into a molded body and sintered under normal pressure or in a vacuum. Alternatively, the raw material for sintering is hydrostatically pressed and sintered under normal pressure or in a vacuum, or the raw material for sintering is pressurized and heated at the same time in a pressure heating chamber for sintering. Alternatively, the raw material for sintering is sintered by isostatic pressure heating in a hydrostatic pressure heating chamber, and the sintering operation is performed in this way to form a large number of high-speed steel particles and hard particles. A cobalt-based heat-resistant alloy, ζ is a nickel-based heat-resistant alloy, or a cobalt-nickel heat-resistant alloy is filled in the gaps between individual particles in a porous sintered body in which a large number of alloy particles or a mixed aggregate is sintered. dσ made of base heat-resistant alloy
A sintered hard alloy composite high speed steel characterized in that it is a sintered composite structure in which a cotton-like alloy structure is formed by bonding individual high speed steel particles and individual hard alloy particles. (2) 50% to 80% by weight of high-speed steel powder and a hard carbide selected from chromium carbide, molybdenum carbide, tungsten carbide, vanadium carbide, niobium carbide, tantalum carbide, titanium carbide, zirconium carbide, and hafnium carbide. 60% to 10% by weight of hard alloy powder, and 50% by weight of cobalt, which forms a bath melt state at a sintering temperature selected from within the range of 1,200°C to 1,300°C. A cobalt-based heat-resistant alloy containing 50% to 90% by weight of nickel, or a nickel-based heat-resistant alloy containing 50% to 85% by weight of cobalt and nickel together. selected from cobalt-nickel based heat-resistant alloys.
The raw material for sintering is a mixed powder in which thermal alloy powder is mixed in a ratio selected from 20% by weight to 10% by weight, and the raw material for sintering is 0.81 on/crri to 10 ton/ The molded body is press-molded using a pressure of 1,200° C. to 1,300° C. under normal pressure or in a vacuum, or
The raw material for sintering is 08 tons/cd to 10 to
The molded body isostatically pressed using a pressure of n/ctl and then heated at 1.200°C to 1.30°C under normal pressure or in a vacuum.
Liquid phase sintering is performed using a temperature of 0°C, or the raw material for sintering is simultaneously pressurized using a pressure of 0.8 ton/crl to 8 ton/Cnl in a pressure heating chamber. Liquid phase sintering is performed by heating at a temperature of 1,200°C to 1,300°C, or the raw material for sintering is heated at a temperature of 0.8 ton/h using a hot isostatic pressure heating device. Liquid phase sintering is performed by isostatic pressure heating using a pressure of crl to 8 ton/clft and heating at a temperature of 1.200°C to 1,300°C for a period of ρ. , by performing any of these sintering operations, a heat-resistant material is created in the gaps between the individual particles in a porous sintered body made of a mixed powder of many high-speed steel particles and many hard carbide particles. Sintered hard alloy composite high-speed alloy is a sintered composite structure that is filled with a spongy alloy structure consisting of an alloy, and the alloy structure is composed of individual high-speed steel particles and individual hard carbide particles. Manufacturing method of speed steel. (3) 50% to 80% by weight of high speed steel powder and 60% to 10% by weight of hard alloy powder, which is a hard nitride selected from titanium nitride, zirconium nitride, hafnium nitride, and silicon nitride. % and 1.200℃ to 1.3
A cobalt-based heat-resistant alloy or nickel containing 50% to 80% by weight of cobalt that forms a molten state at a sintering temperature selected from the range of 0.000C.
A powder of a nickel-based heat-resistant alloy containing 0% to 90% by weight, or a powder of a cobalt-nickel-based heat-resistant alloy containing 50% to 85% by weight of cobalt and nickel combined, 20% to 10% by weight. Claim 2 describes a method of sintering a mixed powder mixed in a ratio selected from within the ratio range of weight % as a raw material for sintering, and sintering the raw material for sintering.
A sintered hard alloy composite high-speed steel characterized in that liquid phase sintering is performed by the same method as the sintering method in Section 3 to produce a sintered structure consisting of high-speed steel powder and hard nitride powder. Manufacturing method. (4) 50% to 80% by weight of high-speed steel powder and powder of a hard alloy, which is a hard boride selected from among titanium dihedral, zirconium dihedral, and hafnicum dihedral.
0% to 15% by weight and 1,200°C to 1.30°C
A cobalt-based heat-resistant alloy containing 50 to 80 gm of cobalt that forms a molten state at a sintering temperature selected from the range of 0°C.
Nickel-based heat-resistant alloy containing 0% to 90% by weight or nickel
A mixed powder obtained by mixing powders of side-heating alloys selected from cobalt-nickel base heat-resistant alloys containing t% to 85% by weight in a ratio selected from within the ratio range of 20% to 10% by weight. is used as a sintering raw material, and liquid A is sintered using the same method as the sintering method in claim 2. A method for producing a sintered hard alloy composite high-speed steel, characterized by producing a composite sintered body consisting of a hard boride alloy powder and a high-speed steel powder. (5) 50% to 80% by weight of high speed steel powder and 1
For sintering, powder of a hard alloy, which is a hard silicide selected from chromium silicide and molybdenum silicide, is used at a temperature of 60% to 20% by weight and a temperature within the range of 1,200°C to 300°C. A cobalt-based heat-resistant alloy containing 50% to 80% by weight of cobalt, which forms a molten state under temperature, or a nickel-based heat-resistant alloy containing 50% to 90% by weight of nickel, or cobalt. Powder of a heat-resistant alloy selected from a cobalt-nickel base heat-resistant alloy containing 50% to 85% by weight in total with nickel in a proportion selected from within the ratio range of 10% to 5% by weight. The mixed powder mixed with the sintering material is used as a raw material for sintering, and the sintering raw material is sintered using the same method as the sintering method in claim 2 to perform high-speed sintering. A method for producing a sintered hard alloy composite high-speed steel, characterized by producing a composite sintered structure consisting of steel powder and hard silicide alloy powder.