CN106312074B - A kind of preparation method of the preforming cutter groove solid tool base substrate of ultra-fine cemented carbide - Google Patents
A kind of preparation method of the preforming cutter groove solid tool base substrate of ultra-fine cemented carbide Download PDFInfo
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- CN106312074B CN106312074B CN201610726695.0A CN201610726695A CN106312074B CN 106312074 B CN106312074 B CN 106312074B CN 201610726695 A CN201610726695 A CN 201610726695A CN 106312074 B CN106312074 B CN 106312074B
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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
- B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
- B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
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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
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
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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
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
- B22F1/103—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material containing an organic binding agent comprising a mixture of, or obtained by reaction of, two or more components other than a solvent or a lubricating agent
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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
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/08—Macromolecular additives
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J171/00—Adhesives based on polyethers obtained by reactions forming an ether link in the main chain; Adhesives based on derivatives of such polymers
- C09J171/02—Polyalkylene oxides
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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
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F2005/001—Cutting tools, earth boring or grinding tool other than table ware
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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Abstract
A kind of preparation method of the preforming cutter groove solid tool base substrate of ultra-fine cemented carbide, is made up of the following steps：The first step, by ultrafine WC, ultra-fine Co, ultra-fine VC and Cr3C2It is well mixed after wet mixing ball milling, obtains each component uniformly ultra-fine compound；Second step, adhesive is added in vacuum kneader, mediate to well mixed, it is in molten condition by material is heated into material in injection (mo(u)lding) machine after the ultra-fine mixture granulation mixed with adhesive, then injection molding mode is used, material is injected into die cavity, ultra-fine cemented carbide soft paste dissolves removing adhesive in water；3rd step, in low-pressure sintering furnace, sintered at a temperature of 1340 ~ 1420 DEG C, by argon pressurization, pressure is 1 ~ 10MPa, prepares the preforming cutter groove solid tool base substrate of ultra-fine cemented carbide.Stock removal during cutter making can be greatly decreased using the preparation method of the present invention, greatly improve the production efficiency of cutter, reduce tungsten resource and waste.
Description
Technical field
The present invention relates to a kind of preparation method of the preforming cutter groove solid tool base substrate of ultra-fine cemented carbide, available for manufacturing
Automobile, electronics, aviation machine and other plant equipment parts machining standards, nonstandard hard alloy solid tool.
Background technology
Solid carbide such as milling cutter, reamer, the combination property of drill bit are wanted made of ultra-fine cemented carbide bar
Higher than conventional high rate steel cutter.Suitable coating technology is equipped with, its comprehensive life will be higher by high-speed steel tool more than 100 times.It is right
For advanced machining center, hard alloy cutter is that it must match somebody with somebody instrument, and the modulus of elasticity of high-speed steel is can not to meet that it is high
Speed cutting requires.In addition high-speed steel tool largely wastes the usage amount of the tungsten resource, at present ultra-fine cemented carbide of domestic preciousness
Account for more than the 50% of cutter material.
For ultra-fine cemented carbide bar because hardness is high, toughness is low, at present, the effective preparation method of solid carbide
It is to use cubic boron nitride or skive sharpening forming and cutting sword and cutter groove, and most of expenditure of time of tool sharpening
In the shaping of cutter groove, wherein valuable tungsten resource loses in vain also with grinding.In order to improve processing efficiency, tungsten money is reduced
Source wastes, and has producer to attempt the method using grinding-shaping cutter groove before hard alloy blank sintering, the method is due to hard alloy
Soft paste low intensity, and the shortcomings of superfine alloy easily aoxidizes in process, cause finished product rate low, product size and production
Quality is difficult to control, it is difficult to batch application.
The content of the invention
The purpose of the present invention is to overcome the shortcomings of the prior art, there is provided a kind of preforming knife of new ultra-fine cemented carbide
The preparation method of groove solid tool base substrate, it is intended to which the processing efficiency and tungsten resource for improving ultra-fine solid carbide utilize
Rate.
To achieve the above object of the invention, the technical solution adopted by the present invention is：A kind of preforming cutter groove of ultra-fine cemented carbide
The preparation method of solid tool base substrate, it is characterised in that：The preparation method is made up of the following steps：
The first step, by ultrafine WC, ultra-fine Co, ultra-fine VC and Cr3C2It is well mixed, obtains each after 24 ~ 72h of wet mixing ball milling
The uniform ultra-fine compound of component, wherein, the ultra-fine wc grain size granularity is 0.2~0.8 μm, in the ultra-fine compound
Weight/mass percentage composition is 84~93.7%, and the ultra-fine Co granularities are 0.6 ~ 1.5 μm, the quality hundred in the ultra-fine compound
It is 6~14% to divide content, and the ultra-fine VC granularities are 0.8 ~ 1.5 μm, and the weight/mass percentage composition in the ultra-fine compound is 0
~0.8%, the Cr3C2Granularity is 0.8 ~ 1.5 μm, and the weight/mass percentage composition in the ultra-fine compound is 0.3~1.2%；
Second step, the ultra-fine compound after drying, add in vacuum kneader and account for the ultra-fine compound weight 1
~ 12% adhesive, 10 ~ 60min is mediated, adhesive and ultra-fine compound are sufficiently mixed uniformly, by mixed with the ultra-fine of adhesive
Material is heated to 135 ~ 210 DEG C in injection (mo(u)lding) machine after mixture granulation, it is in molten condition to make material, is had after material heating
There is good mobility, injection molding mode then used under 10 ~ 135MPa pressure, material is injected into die cavity,
The ultra-fine cemented carbide soft paste of 2 ~ 8 preforming cutter grooves can be once molded simultaneously in a mold, ultra-fine cemented carbide soft paste is in water
In and at 200 ~ 600 DEG C dissolving removing described adhesive；
The composition of raw materials of described adhesive includes the component of following parts by weight：
10 ~ 30 parts of polyvinyl butyral resin,
2 ~ 5 parts of polymethyl methacrylate,
65 ~ 90 parts of polyethylene glycol,
0.5 ~ 1 part of non-ionic polyacrylamide,
1 ~ 2 part of Sodium Polyacrylate,
0.05 ~ 0.1 part of polyimides,
0.1 ~ 1 part of oleic acid,
Wherein, the molecular weight of the polyvinyl butyral resin is 30000 ~ 45000；Point of the polymethyl methacrylate
Son amount is 10000 ~ 200000；The molecular weight of the polyethylene glycol is 600 ~ 15000；Point of the non-ionic polyacrylamide
Son amount is 8 × 106~1×107；The molecular weight of the polyimides is 20000 ~ 30000, and polyimides is powdered, its particle diameter
For 0.5 ~ 5 micron；
3rd step, after the second the end of the step, the ultra-fine cemented carbide soft paste is placed in low-pressure sintering furnace, in 1340
36~60h is sintered at a temperature of ~ 1420 DEG C, promotes alloy to be densified by argon pressurization during high temperature sintering, pressure is 1 ~ 10MPa,
Densification is realized, so as to prepare the preforming cutter groove solid tool base substrate of the ultra-fine cemented carbide of different size.
Relevant content in above-mentioned technical proposal is explained as follows：
1. in such scheme, the composition of raw materials of the binding agent also includes antioxidant, and antioxidant is phenthazine, and its is heavy
It is 0.01 ~ 0.05 part to measure part.The effect of phenthazine is the oxygen in order to prevent polyethylene glycol in powder injection forming heating process
Change.
2. in such scheme, in the first step wet mixing ball milling, wet grinding media is industrial alcohol, acetone and hexane
In any two kinds of mixture, or for industrial alcohol, acetone and hexane three mixture.
3. in such scheme, the ultra-fine VC is ultra-fine vinylene carbonate powder, the ultrafine WC is ultra-fine carbonization
Tungsten powder.
The substantive distinguishing features of the protrusion of technical solution of the present invention and significant progress are mainly reflected in：
1st, the polyvinyl butyral resin added in the binder component in preparation method of the present invention metal powder injection into
Skeleton can be formed after shape in base substrate, it can be further base of the metal dust after injection moulding to add micro polyimides
Body provides support force, forms stable blank structure；Polymethyl methacrylate has good bonding with metal and ceramic powders
Power, make base substrate that there is higher intensity, pressed compact shape can be kept well.
2nd, the polyethylene glycol added in the binder component in preparation method of the present invention has well with oleic acid to powder
Lubricity, it can effectively reduce the interior friction in metal powder material injection process in metal powder material and powder and injection machine and mould
External friction between tool, power loss is reduced, improve the rheological characteristic of powder；
3rd, the non-ionic polyacrylamide added in the binder component in preparation method of the present invention can be metal powder
End provides certain cohesive force, and and can is effectively reduced frictional resistance mutual in metal powder material injection process；And add
Sodium Polyacrylate certain peptizaiton is played to whole binding agent, while can also make in Metal Injection Molding Processes
Binding agent stably, be uniformly dispersed to metal dust.
4th, the program is easy to operate, easy implementation, and 1 ~ 12% sheet for accounting for metal powder material weight is added in injection moulding powder
The novel binders of invention, in injection moulding, material fluidity is good, and pressed compact defect is few, and intensity is high, and readily removed, without harmful
Decompose, residue, can meet the technique and technical requirements of metal, ceramic powder injection molding, economic benefit is very notable.
5th, the binding agent in preparation method of the present invention is different from prior paraffin based binder, is water-soluble binder.Due to
Institute's addO-on therapy is mostly water miscible, and therefore, blank can be removed binding agent using water-soluble solution after powder injection forming,
With prior paraffin based binder organic solvent catalytic eliminating method ratio, this is a kind of quick, cheap, free of contamination removal methods.
6th, the preforming cutter groove ultra-fine cemented carbide base substrate produced using preparation method of the present invention, can be greatly decreased ultra-fine whole
Stock removal when body hard alloy cutter makes, thus the production efficiency of cutter can be greatly improved, and reduce the waste of tungsten resource.
7th, the preforming cutter groove solid tool base substrate of the ultra-fine cemented carbide be used for manufacture automobile, electronics, aviation machine and
Other plant equipment parts machining standards, nonstandard efficient hard alloy solid tool.
Brief description of the drawings
Accompanying drawing 1 is the preforming cutter groove solid tool base substrate flow sheet of ultra-fine cemented carbide；
Accompanying drawing 2 is ultra-fine cemented carbide blank forming schematic diagram；
Accompanying drawing 3 is ultra-fine cemented carbide straight fluted reamer schematic top plan view；
Accompanying drawing 4 is ultra-fine cemented carbide straight fluted reamer schematic front view；
The implication of reference in figure：1st, mold runner；2nd, cast gate；3rd, die cavity.
Embodiment
Below in conjunction with the accompanying drawings and embodiment the invention will be further described：
Embodiment 1 ~ 3：A kind of preparation method of the preforming cutter groove solid tool base substrate of ultra-fine cemented carbide
The preparation method is made up of the following steps：
The first step, by ultrafine WC, ultra-fine Co, ultra-fine VC and Cr3C2It is well mixed after wet mixing ball milling 48h, obtains each component
Uniform ultra-fine compound, wherein, the ultra-fine wc grain size granularity is 0.5 μm, the quality percentage in the ultra-fine compound
Content is 87.2%, and the ultra-fine Co granularities are 0.8 μm, and the weight/mass percentage composition in the ultra-fine compound is 12%, described
Ultra-fine VC granularities are 1 μm, and the weight/mass percentage composition in the ultra-fine compound is 0.3%, the Cr3C2Granularity is 1.2 μm,
Weight/mass percentage composition in the ultra-fine compound is 0.5%；
Second step, the ultra-fine compound after drying, add in vacuum kneader and account for the ultra-fine compound weight
10% adhesive, 30min is mediated, 200 mesh wipe sieve series grain after adhesive and the ultra-fine compound are sufficiently mixed, will be mixed with
Material is heated to 200 DEG C in injection (mo(u)lding) machine after the ultra-fine mixture granulation of adhesive, makes material be in molten condition, material
There is good mobility after heating, injection molding mode is then used under 100MPa pressure, material is injected into mould
In chamber, the ultra-fine cemented carbide soft paste of 8 preforming cutter grooves can be once molded simultaneously in a mold, ultra-fine cemented carbide soft paste exists
Dissolving removing described adhesive is segmented in water and at 200 ~ 600 DEG C；In wet mixing ball milling, wet grinding media is industrial alcohol, third
Ketone and the mixture of hexane three；
The composition of raw materials of described adhesive includes the component of following parts by weight：
10 ~ 30 parts of polyvinyl butyral resin,
2 ~ 5 parts of polymethyl methacrylate,
65 ~ 90 parts of polyethylene glycol,
0.5 ~ 1 part of non-ionic polyacrylamide,
1 ~ 2 part of Sodium Polyacrylate,
0.05 ~ 0.1 part of polyimides,
0.1 ~ 1 part of oleic acid,
Wherein, the molecular weight of the polyvinyl butyral resin is 35000；The molecular weight of the polymethyl methacrylate is
15000；The molecular weight of the polyethylene glycol is 10000；The molecular weight of the non-ionic polyacrylamide is 8 × 106；It is described
The molecular weight of polyimides is 25000, and polyimides is powdered, and its particle diameter is 0.5 ~ 5 micron；
3rd step, after the second the end of the step, the ultra-fine cemented carbide soft paste is placed in low-pressure sintering furnace, in 1400
Sinter 36h at a temperature of DEG C, promote alloy to be densified by argon pressurization during high temperature sintering, pressure 8MPa, realize densification, from
And the preforming cutter groove solid tool base substrate of the ultra-fine cemented carbide for preparing different size, referring to accompanying drawing 1 to the institute of accompanying drawing 4
Show.
The preparation method of binding agent described in embodiment 1 ~ 3：According to the formula of table 1 by polyvinyl butyral resin, poly- methyl
Methyl acrylate, polyethylene glycol, non-ionic polyacrylamide, Sodium Polyacrylate, polyimides, oleic acid and phenthazine according to
After respective parts by weight weigh up, above-mentioned raw materials are added into stirring in the bucket equipped with water under agitation and, to being well mixed, made
Described metal powder injection molded use binding agent.
It is above-mentioned it is metal powder injection molded be made up of with binding agent the component of following parts by weight, as shown in table 1：
Table 1
In summary, the preforming cutter groove ultra-fine cemented carbide tool blank produced using this method accurately controls cutter groove chi
It is very little, and alloy structure even compact can be ensured, with conventional production methods ratio, improve cutter making efficiency and bring up to more than 80%,
Reduce more than 30% tungsten data waste, be worth wide popularization and application in the field of business.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art
Scholar can understand present disclosure and implement according to this, and it is not intended to limit the scope of the present invention.It is all according to the present invention
The equivalent change or modification that Spirit Essence is made, it should all be included within the scope of the present invention.
Claims (3)
- A kind of 1. preparation method of the preforming cutter groove solid tool base substrate of ultra-fine cemented carbide, it is characterised in that：The preparation method It is made up of the following steps：The first step, by ultrafine WC, ultra-fine Co, ultra-fine VC and Cr3C2It is well mixed after 24 ~ 72h of wet mixing ball milling, obtains each component Uniform ultra-fine compound, wherein, the ultra-fine wc grain size granularity is 0.2~0.8 μm, the quality in the ultra-fine compound Percentage composition is 84~93.7%, and the ultra-fine Co granularities are 0.6 ~ 1.5 μm, and the quality percentage in the ultra-fine compound contains Measure as 6~14%, the ultra-fine VC granularities are 0.8 ~ 1.5 μm, the weight/mass percentage composition in the ultra-fine compound for 0~ 0.8%, the Cr3C2Granularity is 0.8 ~ 1.5 μm, and the weight/mass percentage composition in the ultra-fine compound is 0.3~1.2%；Second step, the ultra-fine compound after drying, add in vacuum kneader and account for the ultra-fine compound weight 1 ~ 12% Adhesive, mediate 10 ~ 60min, adhesive and ultra-fine compound be sufficiently mixed uniformly, by mixed with the ultra-fine mixing of adhesive Material is heated to 135 ~ 210 DEG C in injection (mo(u)lding) machine after material granulation, it is in molten condition to make material, is had after material heating good Good mobility, injection molding mode is then used under 10 ~ 135MPa pressure, material is injected into die cavity, in mould In tool once simultaneously be molded 2 ~ 8 preforming cutter grooves ultra-fine cemented carbide soft paste, ultra-fine cemented carbide soft paste in water and Dissolving removing described adhesive at 200 ~ 600 DEG C；The composition of raw materials of described adhesive includes the component of following parts by weight：10 ~ 30 parts of polyvinyl butyral resin,2 ~ 5 parts of polymethyl methacrylate,65 ~ 90 parts of polyethylene glycol,0.5 ~ 1 part of non-ionic polyacrylamide,1 ~ 2 part of Sodium Polyacrylate,0.05 ~ 0.1 part of polyimides,0.1 ~ 1 part of oleic acid,Wherein, the molecular weight of the polyvinyl butyral resin is 30000 ~ 45000；The molecular weight of the polymethyl methacrylate For 10000 ~ 200000；The molecular weight of the polyethylene glycol is 600 ~ 15000；The molecular weight of the non-ionic polyacrylamide For 8 × 106~1×107；The molecular weight of the polyimides is 20000 ~ 30000, and polyimides is powdered, and its particle diameter is 0.5 ~ 5 microns；3rd step, after the second the end of the step, the ultra-fine cemented carbide soft paste is placed in low-pressure sintering furnace, in 1340 ~ 36~60h is sintered at a temperature of 1420 DEG C, promotes alloy to be densified by argon pressurization during high temperature sintering, pressure be 1 ~ 10MPa, reality Now it is densified, so as to prepare the preforming cutter groove solid tool base substrate of the ultra-fine cemented carbide of different size.
- 2. a kind of preparation method of the preforming cutter groove solid tool base substrate of ultra-fine cemented carbide according to claim 1, its It is characterised by：The composition of raw materials of described adhesive also includes antioxidant, and antioxidant is phenthazine, its parts by weight be 0.01 ~ 0.05 part.
- 3. a kind of preparation method of the preforming cutter groove solid tool base substrate of ultra-fine cemented carbide according to claim 1, its It is characterised by：In the first step wet mixing ball milling, wet grinding media is any two kinds in industrial alcohol, acetone and hexane Mixture, or the mixture for industrial alcohol, acetone and hexane three.
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| CN108193119A (en) * | 2017-12-21 | 2018-06-22 | 广东金木水火土实业有限公司 | A kind of high-precision optical fiber cutting blade and its processing method |
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| CN110181059A (en) * | 2018-12-13 | 2019-08-30 | 苏州赛特锐精密机械配件有限公司 | A kind of method of co-injection near-net-shape ultra-fine cemented carbide cutter green body |
| EP3711880A1 (en) * | 2019-03-19 | 2020-09-23 | Seco Tools Ab | Feedstock and method for manufacturing the feedstock |
| CN113828778B (en) * | 2021-09-23 | 2023-12-19 | 东睦新材料集团股份有限公司 | Water-soluble binder, preparation method of binder and method for preparing part |
| CN115896519A (en) * | 2022-11-16 | 2023-04-04 | 河南大地合金有限公司 | Method for preparing hard alloy from WC ultrafine powder and hard alloy |
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