CN109234595A - A kind of nonmagnetic hard alloy and preparation method thereof - Google Patents
A kind of nonmagnetic hard alloy and preparation method thereof Download PDFInfo
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- CN109234595A CN109234595A CN201811274229.9A CN201811274229A CN109234595A CN 109234595 A CN109234595 A CN 109234595A CN 201811274229 A CN201811274229 A CN 201811274229A CN 109234595 A CN109234595 A CN 109234595A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C27/00—Alloys based on rhenium or a refractory metal not mentioned in groups C22C14/00 or C22C16/00
- C22C27/04—Alloys based on tungsten or molybdenum
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/1003—Use of special medium during sintering, e.g. sintering aid
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- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/05—Mixtures of metal powder with non-metallic powder
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Abstract
Nonmagnetic hard alloy of the invention is by adjusting nickel powder, copper powder, tungsten powder, boron powder, the ratio of carbon dust, scientifically by above-mentioned raw materials by the way that after mixing, vacuum high-temperature compression moulding and sintering, obtained hard alloy has good intensity and hardness.The nonmagnetic hard alloy of the application has high red hardness and good high-temperature oxidation resistance, and grain size is uniform, and alloy rigidity is high；For artificial intelligence wireless telecommunications workshop, such as intelligent potroom, smelting shop, nuclear power station occasion or the nonmagnetic high abrasion-proof and high temperature resistant in high current voltage workshop material members, long service life, replacement frequency is low, maintenance cost is low, it raises labour productivity, reduces labor intensity；Easily influence the production efficiency and production cost of enterprise.Preparation method is simple for hard alloy of the invention, can be conveniently used for producing in enormous quantities.
Description
Technical field
The present invention relates to a kind of alloying technologys, especially hard alloy, more particularly, to a kind of nonmagnetic hard alloy
And preparation method thereof.
Background technique
Hard alloy is hard compounds and binding metal one kind made of powder metallurgical technique of refractory metal
Alloy material has a series of excellent performances such as hardness is high, wear-resisting, intensity and toughness are preferable, heat-resisting, corrosion-resistant, is known as " work
Industry tooth " is widely used in the fields such as cutter material, machining, aerospace, high pressure-temperature test.It is universal on domestic market
The Cemented Carbide Hardness of application up to HRA86-93, even if 500 DEG C at a temperature of be held essentially constant, still at 1000 DEG C
Keep high rigidity.
Hard alloy has many advantages, such as intensity, hardness height, good in thermal property, wear-resisting, resistance function admirable, therefore, firmly
Matter alloy has been more and more widely used.Hard alloy is by with high compressive strength, high rigidity, the indissoluble of high elastic modulus
Carbide composition, powder compares the raw plastic deformation of difficult labour in pressing process.To improve powder forming performance, increase briquetting
Intensity shifts convenient for green compact, binder need to be added in powder material before forming.And as intermediate auxiliary material, binder is de-
It must be able to slough completely in the glue stage, any residual all can bring hidden danger of quality to product.
Artificial intelligence wireless telecommunications workshop, such as intelligent potroom, smelting shop, nuclear power station occasion or high current electricity
The material members of nonmagnetic high abrasion-proof and high temperature resistant between delaying unloading；Its component is mostly cemented carbide material, when in use, due to work
Environment temperature is usually 800 DEG C -1100 DEG C, requires height to the red hardness of hard alloy, and traditional hard alloy composition is main
For WC, Co, wherein raw material WC is coarse granule (grain size is 2.4 μm~3.2 μm), and hard alloy is in 800 DEG C of -1100 DEG C of temperature rings
Under border, since red hardness low and high temperature inoxidizability is poor, being cracked easily occurs in material, collapse block situations such as and service life is short, replacement frequency
Rate is high, maintenance cost is high, easily influences the production efficiency and production cost of enterprise.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of nonmagnetic hard alloy, solve nonmagnetic in the prior art
The problems such as red hardness of hard alloy is low, and high-temperature oxidation resistance is poor, the present invention provides nonmagnetic hard alloy and its producers
Method, hard alloy of the invention have high red hardness and good high-temperature oxidation resistance, and grain size is uniform, and alloy rigidity is high.
The purpose of the present invention is achieved by the following technical programs:
Disclosed nonmagnetic hard alloy is prepared by following each raw material according to parts by weight:
Nickel powder: 17-20 parts,
Copper powder: 8-10 parts,
Boron powder: 16-20 parts,
Deslagging agent, nodulizer: 1-3 parts,
Forming agent: 6-10 parts,
Carbon dust: 15-30 parts,
Tungsten powder: 30-60 parts.
Nickel powder, copper powder mainly play cementation, and collaboration plays a role, and guarantee the toughness of cemented carbide material and use the longevity
Life, in addition, controlling by latter temperature cooling curve, can control the crystal structure of nickel, copper, provides toughness for hard alloy；
Meanwhile keeping hard alloy of the invention nonmagnetic, it can be used for highfield working environment, or require non-magnetic environment.Tungsten, boron with
Carbon dust reacts at high temperature generates tungsten carbide and boron carbide, and hard alloy is mainly made to reach high rigidity, high intensity and high abrasion etc.
Performance.
Further, the purity of the nickel powder is more than or equal to 99.5%, and the partial size of the nickel powder is 1.0-5.0 μm；Copper powder
Purity be superfine cupper powder, the partial size of copper powder is 1-100nm；The purity of tungsten powder is more than or equal to 98.5%, and the partial size of tungsten powder is
2.0-5.0μm；99% or more the purity of boron powder, the partial size of boron powder are 5-8 μm；The purity of carbon dust is 80% or more, the grain of carbon dust
Diameter is 1.0-5.0 μm.
Traditional hard alloy preparation selects tungsten-carbide powder to do raw material, needs first to be prepared or bought tungsten-carbide powder
And titanium carbide powder, then the raw materials such as above-mentioned powder and nickel powder are mixed together, it is sintered at high temperature into hard alloy；Because producing high-quality
Measure hard metal article, it is necessary to the total carbon in strict control alloy.Although it is many to influence hard metal article total carbon factor,
In the case that tungsten carbide material quality is stablized, influence of the application of binder to product total carbon is a very important side
Face, cost of manufacture are higher.The application uses carbon dust, and tungsten powder, nickel powder is primary raw material, addition copper powder, the raw materials such as boron, cobalt powder, no
But many and diverse preparation section of tungsten-carbide powder is eliminated, and the quality of hard alloy can be effectively controlled.
The present invention discloses the preparation method of above-mentioned nonmagnetic hard alloy, including following preparation step:
S1. ball mill is added in above-mentioned hard alloy material, and injects after alcohol and mixes 1-3 hours, wherein ball milling ratio is
5-7:1；Then first time vacuum drying is carried out；Vacuum degree is 0-0.1Pa, and drying temperature is 200-300 DEG C, drying time 1-
2h；
S2. forming agent is mixed in powder upon mixing, at 300-400 DEG C, carries out second and be dried in vacuo；Vacuum degree
For 0-0.1Pa, drying time 0.8-1.5h；
S3. it will be sintered under the blank of compression moulding again 0-0.1Pa vacuum state, sintering temperature is 3000-3500 DEG C, sintering
Time is 2.5-3h.
Further, forming agent is any one of rubber, paraffin and polyethylene glycol.
Further, the step S3 is sintered to interim heating, specific steps are as follows:
S31. warm-up phase: temperature is raised to 600-800 DEG C, heating rate is 80-100 DEG C/min, keeps the temperature 0.5-
0.8min；
S32. low-temperature sintering stage: temperature is raised to 1050-1200 DEG C, heating rate is 110-130 DEG C/min, heat preservation
1.0-1.5min；
S33. high temperature sintering stage: temperature is raised to 3000-3500 DEG C, heating rate is 130-150 DEG C/min, heat preservation
0.7-1.0min。
Further, the sintered hard alloy process cools down stage by stage, is slow cooling to 1400-1500 DEG C, protects
Warm 1-2h, while additional ultrasonic wave acts on, ultrasonic intensity is more than or equal to 1KW/m2, make material dispersion, control crystallization promotes
Crystalline orientation；Then it is cooled fast to 1100-1300 DEG C, keeps the temperature 0.5-1h；Then rapid cooling keeps the temperature 1- to 700-800 DEG C
2h is then placed in 0-4 DEG C of water rapid cooling to room temperature.
Further, the cooling velocity of the slow cooling is 8-10 DEG C/min, and the cooling velocity of the rapid cooling is
20-30 DEG C/min, the cooling velocity of the rapid cooling is 40-50 DEG C/min.
Further, the sintering carries out under the protective atmosphere of nitrogen.
Compared with prior art, the invention has the following beneficial effects:
Nonmagnetic hard alloy of the invention scientifically will by adjusting nickel powder, copper powder, tungsten powder, boron powder, the ratio of carbon dust
Above-mentioned raw materials by by mixing, vacuum high-temperature compression moulding and sintering after, be improved the intensity of hard alloy with hardness,
Obtained hard alloy has good intensity and hardness, has good high-temperature oxidation resistance, and grain size is uniform.
The nonmagnetic hard alloy of the application has high red hardness and good high-temperature oxidation resistance, and grain size is uniform, closes
Golden hardness is high, is used for artificial intelligence wireless telecommunications workshop, such as intelligent potroom, smelting shop, nuclear power station occasion or height
The material members of the nonmagnetic high abrasion-proof and high temperature resistant in Current Voltage workshop, long service life, replacement frequency is low, maintenance cost
It is low, it raises labour productivity, reduces labor intensity；Easily influence the production efficiency and production cost of enterprise.
Nonmagnetic hard alloy crystal grain distribution prepared by the present invention is uniform, and coarse-grain content is few, and partial size coefficient of dispersion is low, material
Shock resistance fatigue capability and service life it is higher.
Preparation method is simple for hard alloy of the invention, can be conveniently used for producing in enormous quantities.
Specific embodiment
The present invention is further illustrated below in conjunction with specification and specific embodiment, but embodiment does not appoint the present invention
The restriction of what form.Unless stated otherwise, the present invention uses reagent, method and apparatus is the art conventional reagents, side
Method and equipment.Unless stated otherwise, raw material and equipment used in the present embodiment be the art regular market purchase raw material and
Equipment.
Embodiment 1
The nonmagnetic hard alloy of the present embodiment is prepared by following each raw material according to parts by weight:
Nickel powder: 17 parts,
Copper powder: 10 parts,
Boron powder: 16 parts,
Deslagging agent, nodulizer: 3 parts,
Forming agent: 6 parts,
Carbon dust: 30 parts,
Tungsten powder: 60 parts.
The purity of nickel powder is more than or equal to 99.5%, and partial size is 1.0-5.0 μm；The purity of copper powder is superfine cupper powder, copper powder
Partial size is 1-100nm；The purity of tungsten powder is more than or equal to 98.5%, and the partial size of tungsten powder is 2.0-5.0 μm；The purity 99% of boron powder
More than, the partial size of boron powder is 5-8 μm；The purity of carbon dust is 80% or more, and the partial size of carbon dust is 1.0-5.0.
Preparation method, including following preparation step:
S1. ball mill is added in above-mentioned hard alloy material, and is mixed 1 hour after injecting alcohol, wherein ball milling ratio is 5:
1；Then first time vacuum drying is carried out；The first time vacuum drying vacuum degree is 0-0.1Pa, and drying temperature is 300 DEG C,
Drying time is 1h；
S2. forming agent is mixed in powder upon mixing, at 300 DEG C, carries out second and be dried in vacuo；Wherein described
The dry vacuum degree of secondary vacuum is 0-0.1Pa, drying time 1.5h；
S3. under the protective atmosphere of nitrogen, will be sintered under the blank of compression moulding again 0-0.1Pa vacuum state, sintering temperature
Degree is 3000 DEG C, sintering time 3h.
Forming agent is paraffin in the present embodiment.
Step S3's is sintered to interim heating, specific steps are as follows:
S31. warm-up phase: temperature is raised to 800 DEG C, heating rate is 80 DEG C/min, keeps the temperature 0.8min；
S32. low-temperature sintering stage: temperature is raised to 1050 DEG C, heating rate is 110 DEG C/min, keeps the temperature 1.5min；
S33. high temperature sintering stage: temperature is raised to 3000 DEG C, heating rate is 130 DEG C/min, keeps the temperature 0.7min.
Sintered hard alloy process cools down stage by stage, and cooling velocity is 8-10 DEG C/min, is slow cooling to 1400 DEG C,
2h is kept the temperature, while additional ultrasonic wave acts on, ultrasonic intensity is more than or equal to 1KW/m2, keep material dispersion equal；Then cooling velocity
For 20-30 DEG C/min, 1100 DEG C are cooled fast to, keeps the temperature 1h；Then cooling velocity is 40-50 DEG C/min, rapid cooling to 700
DEG C, 2h is kept the temperature, is then placed in 0-4 DEG C of water rapid cooling to room temperature.
Embodiment 2
The nonmagnetic hard alloy of the present embodiment is prepared by following each raw material according to parts by weight:
Nickel powder: 20 parts,
Copper powder: 8 parts,
Boron powder: 20 parts,
Deslagging agent, nodulizer: 1.5 parts,
Forming agent: 8 parts,
Carbon dust: 23 parts,
Tungsten powder: 46 parts.
The purity of nickel powder is more than or equal to 99.5%, and partial size is 1.0-5.0 μm；The purity of copper powder is superfine cupper powder, copper powder
Partial size is 1-100nm；The purity of tungsten powder is more than or equal to 98.5%, and the partial size of tungsten powder is 2.0-5.0 μm；The purity 99% of boron powder
More than, the partial size of boron powder is 5-8 μm；The purity of carbon dust is 80% or more, and the partial size of carbon dust is 1.0-5.0.
Preparation method, including following preparation step:
S1. ball mill is added in above-mentioned hard alloy material, and is mixed 3 hours after injecting alcohol, wherein ball milling ratio is 7:
1；Then first time vacuum drying is carried out；The first time vacuum drying vacuum degree is 0-0.1Pa, and drying temperature is 200 DEG C,
Drying time is 2h；
S2. forming agent is mixed in powder upon mixing, at 400 DEG C, carries out second and be dried in vacuo；Wherein described
The dry vacuum degree of secondary vacuum is 0-0.1Pa, drying time 0.8h；
S3. under the protective atmosphere of nitrogen, will be sintered under the blank of compression moulding again 0-0.1Pa vacuum state, sintering temperature
Degree is 3500 DEG C, sintering time 2.5h.
Forming agent is paraffin in the present embodiment.
Step S3's is sintered to interim heating, specific steps are as follows:
S31. warm-up phase: temperature is raised to 650 DEG C, heating rate is 100 DEG C/min, keeps the temperature 0.5min；
S32. low-temperature sintering stage: temperature is raised to 1200 DEG C, heating rate is 130 DEG C/min, keeps the temperature 1.0min；
S33. high temperature sintering stage: temperature is raised to 3500 DEG C, heating rate is 150 DEG C/min, keeps the temperature 1.0min.
Sintered hard alloy process cools down stage by stage, and cooling velocity is 8-10 DEG C/min, is slow cooling to 1500 DEG C,
0.5h is kept the temperature, while additional ultrasonic wave acts on, ultrasonic intensity is more than or equal to 1KW/m2, keep material dispersion equal；Then cooling speed
Degree is 20-30 DEG C/min, is cooled fast to 1100 DEG C, keeps the temperature 1h；Then cooling velocity is 40-50 DEG C/min, and rapid cooling arrives
800 DEG C, 2h is kept the temperature, is then placed in 0-4 DEG C of water rapid cooling to room temperature.
Embodiment 3
The nonmagnetic hard alloy of the present embodiment is prepared by following each raw material according to parts by weight:
Nickel powder: 18 parts,
Copper powder: 9 parts,
Boron powder: 18 parts,
Deslagging agent, nodulizer: 2 parts,
Forming agent: 6 parts,
Carbon dust: 15 parts,
Tungsten powder: 30 parts.
The purity of nickel powder is more than or equal to 99.5%, and partial size is 1.0-5.0 μm；The purity of copper powder is superfine cupper powder, copper powder
Partial size is 1-100nm；The purity of tungsten powder is more than or equal to 98.5%, and the partial size of tungsten powder is 2.0-5.0 μm；The purity 99% of boron powder
More than, the partial size of boron powder is 5-8 μm；The purity of carbon dust is 80% or more, and the partial size of carbon dust is 1.0-5.0.
Preparation method, including following preparation step:
S1. ball mill is added in above-mentioned hard alloy material, and is mixed 3 hours after injecting alcohol, wherein ball milling ratio is 7:
1；Then first time vacuum drying is carried out；The first time vacuum drying vacuum degree is 0-0.1Pa, and drying temperature is 200 DEG C,
Drying time is 2h；
S2. forming agent is mixed in powder upon mixing, at 400 DEG C, carries out second and be dried in vacuo；Wherein described
The dry vacuum degree of secondary vacuum is 0-0.1Pa, drying time 0.8h；
S3. under the protective atmosphere of nitrogen, will be sintered under the blank of compression moulding again 0-0.1Pa vacuum state, sintering temperature
Degree is 3500 DEG C, sintering time 2.5h.
Forming agent is paraffin in the present embodiment.
Step S3's is sintered to interim heating, specific steps are as follows:
S31. warm-up phase: temperature is raised to 650 DEG C, heating rate is 90 DEG C/min, keeps the temperature 0.5min；
S32. low-temperature sintering stage: temperature is raised to 1180 DEG C, heating rate is 120 DEG C/min, keeps the temperature 1.0min；
S33. high temperature sintering stage: temperature is raised to 3000 DEG C, heating rate is 140 DEG C/min, keeps the temperature 0.8min.
Sintered hard alloy process cools down stage by stage, and cooling velocity is 8-10 DEG C/min, is slow cooling to 1450 DEG C,
0.5h is kept the temperature, while additional ultrasonic wave acts on, ultrasonic intensity 2KW/m2, keep material dispersion equal；Then cooling velocity is 20-30
DEG C/min, 1150 DEG C are cooled fast to, 1h is kept the temperature；Then cooling velocity is 40-50 DEG C/min, and rapid cooling is to 750 DEG C, heat preservation
1.5h is then placed in 0-4 DEG C of water rapid cooling to room temperature.
Comparative example 1
The nonmagnetic hard alloy of this comparative example is prepared by following each raw material according to parts by weight:
Nickel powder: 15 parts,
Copper powder: 11 parts,
Boron powder: 15 parts,
Deslagging agent, nodulizer: 3.5 parts,
Forming agent: 5 parts,
Carbon dust: 32 parts,
Tungsten powder: 62 parts.Preparation method is same as Example 1.
Comparative example 2
The nonmagnetic hard alloy of this comparative example is prepared by following each raw material according to parts by weight:
Nickel powder: 22 parts,
Copper powder: 6 parts,
Boron powder: 23 parts,
Deslagging agent, nodulizer: 0.8 part,
Forming agent: 12 parts,
Carbon dust: 14 parts,
Tungsten powder: 28 parts.Preparation method is same as Example 1.
Comparative example 3
The raw material and content of the nonmagnetic hard alloy of this comparative example are identical as embodiment.Preparation method includes following step
It is rapid:
S1. ball mill is added in above-mentioned hard alloy material, and injects after alcohol and mixes 1-3 hours, wherein ball milling ratio is
3:1；Then first time vacuum drying is carried out；The first time vacuum drying vacuum degree is 0-0.1Pa, drying temperature 350
DEG C, drying time 3h；
S2. forming agent is mixed in powder upon mixing, at 450 DEG C, carries out second and be dried in vacuo；Wherein described
The dry vacuum degree of secondary vacuum is 0-0.1Pa, drying time 2.0h；
S3. it will be sintered under the blank of compression moulding again 0-0.1Pa vacuum state, be 130-150 according to average heating rate
DEG C/min, sintering temperature is 2000 DEG C, sintering time 4h.
By the resulting hard alloy of the method for above-described embodiment 1- embodiment 3 and comparative example 1- comparative example 3 carry out hardness and
The test of bending strength, experiment the results are shown in Table 1.
Table 1
According to the experimental results, hard alloy of the invention has good intensity and hardness, and surface oxidation-resistant is high
In existing nonmagnetic hard alloy, there is good high-temperature oxidation resistance, grain size is uniform, and alloy rigidity is high.
Basic principles and main features of the invention and advantage of the invention has been shown and described above.The technology of this field
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, this is to this
It is for the technical staff of field it will be apparent that these changes and improvements all fall within the protetion scope of the claimed invention.This hair
Bright claimed range is defined by the appending claims and its equivalent thereof.
Claims (8)
1. a kind of nonmagnetic hard alloy, which is characterized in that according to parts by weight, be prepared by following each raw material:
Nickel powder: 17-20 parts,
Copper powder: 8-10 parts,
Boron powder: 16-20 parts,
Deslagging agent, nodulizer: 1-3 parts,
Forming agent: 6-10 parts,
Carbon dust: 15-30 parts,
Tungsten powder: 30-60 parts.
2. nonmagnetic hard alloy according to claim 1, which is characterized in that the purity of the nickel powder is more than or equal to
99.5%, the partial size of the nickel powder is 1.0-5.0 μm；The purity of copper powder is superfine cupper powder, and the partial size of copper powder is 1-100nm；Tungsten
The purity of powder is more than or equal to 98.5%, and the partial size of tungsten powder is 2.0-5.0 μm；99% or more the purity of boron powder, the partial size of boron powder
It is 5-8 μm；The purity of carbon dust is 80% or more, and the partial size of carbon dust is 1.0-5.0 μm.
3. a kind of preparation method of hard alloy nonmagnetic as described in claim 1 or claim 2, which is characterized in that including
Following preparation step:
S1. ball mill is added in above-mentioned hard alloy material, and is mixed 1-3 hours after injecting alcohol, wherein ball milling ratio is 5-7:
1；Then first time vacuum drying is carried out；Vacuum degree is 0-0.1Pa, and drying temperature is 200-300 DEG C, drying time 1-2h；
S2. forming agent is mixed in powder upon mixing, at 300-400 DEG C, carries out second and be dried in vacuo；Vacuum degree is 0-
0.1Pa, drying time 0.8-1.5h；
S3. it will be sintered under the blank of compression moulding again 0-0.1Pa vacuum state, sintering temperature is 3000-3500 DEG C, sintering time
For 2.5-3h.
4. the preparation method of nonmagnetic hard alloy according to claim 3, which is characterized in that the forming agent be rubber,
Any one of paraffin and polyethylene glycol.
5. the preparation method of nonmagnetic hard alloy according to claim 3, which is characterized in that the step S3's is sintered to
Stage heating, specific steps are as follows:
S31. warm-up phase: temperature is raised to 600-800 DEG C, heating rate is 80-100 DEG C/min, keeps the temperature 0.5-0.8min；
S32. low-temperature sintering stage: temperature is raised to 1050-1200 DEG C, heating rate is 110-130 DEG C/min, keeps the temperature 1.0-
1.5min；
S33. high temperature sintering stage: temperature is raised to 3000-3500 DEG C, heating rate is 130-150 DEG C/min, keeps the temperature 0.7-
1.0min。
6. the preparation method of nonmagnetic hard alloy according to claim 3, which is characterized in that the sintered hard closes
Golden process cools down stage by stage, is slow cooling to 1400-1500 DEG C, keeps the temperature 1-2h, while additional ultrasonic wave acts on, ultrasonic intensity
More than or equal to 1KW/m2, keep material dispersion equal；Then it is cooled fast to 1100-1300 DEG C, keeps the temperature 0.5-1h；Then rapid cooling
To 700-800 DEG C, 1-2h is kept the temperature, is then placed in 0-4 DEG C of water rapid cooling to room temperature.
7. the preparation method of nonmagnetic hard alloy according to claim 6, which is characterized in that the cooling of the slow cooling
Speed is 8-10 DEG C/min, and the cooling velocity of the rapid cooling is 20-30 DEG C/min, and the cooling velocity of the rapid cooling is
40-50℃/min。
8. the preparation method of nonmagnetic hard alloy according to claim 3, which is characterized in that guarantor of the sintering in nitrogen
It is carried out under shield atmosphere.
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