CN107739950B - WC-Co-cBN composite hard alloy and preparation method thereof - Google Patents
WC-Co-cBN composite hard alloy and preparation method thereof Download PDFInfo
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- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 35
- 239000000956 alloy Substances 0.000 title claims abstract description 35
- 239000002131 composite material Substances 0.000 title claims abstract description 21
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000000843 powder Substances 0.000 claims abstract description 40
- 239000003112 inhibitor Substances 0.000 claims abstract description 9
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 6
- 239000000126 substance Substances 0.000 claims abstract description 6
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 4
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 3
- 238000003754 machining Methods 0.000 claims abstract description 3
- 229910052751 metal Inorganic materials 0.000 claims abstract description 3
- 239000002184 metal Substances 0.000 claims abstract description 3
- 239000011812 mixed powder Substances 0.000 claims abstract description 3
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 3
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 3
- 229910052727 yttrium Inorganic materials 0.000 claims abstract description 3
- 238000000498 ball milling Methods 0.000 claims description 24
- 238000005245 sintering Methods 0.000 claims description 21
- 239000002245 particle Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- 239000000080 wetting agent Substances 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 239000013078 crystal Substances 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 5
- 238000007873 sieving Methods 0.000 claims description 5
- 238000001291 vacuum drying Methods 0.000 claims description 5
- 238000005303 weighing Methods 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 229910002804 graphite Inorganic materials 0.000 claims description 4
- 239000010439 graphite Substances 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical group CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- 239000011230 binding agent Substances 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 239000000758 substrate Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- 238000005498 polishing Methods 0.000 claims description 2
- 238000012360 testing method Methods 0.000 claims description 2
- 229910003470 tongbaite Inorganic materials 0.000 claims description 2
- 238000001238 wet grinding Methods 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims 1
- 238000005520 cutting process Methods 0.000 abstract description 9
- 238000012545 processing Methods 0.000 abstract description 6
- 238000002490 spark plasma sintering Methods 0.000 abstract description 2
- 229910009043 WC-Co Inorganic materials 0.000 description 6
- 239000012071 phase Substances 0.000 description 6
- 229910017052 cobalt Inorganic materials 0.000 description 4
- 239000010941 cobalt Substances 0.000 description 4
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 4
- 239000007791 liquid phase Substances 0.000 description 4
- 230000009466 transformation Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000007790 solid phase Substances 0.000 description 3
- 229910052582 BN Inorganic materials 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000012876 topography Methods 0.000 description 2
- 235000012431 wafers Nutrition 0.000 description 2
- 229910001141 Ductile iron Inorganic materials 0.000 description 1
- 229910000760 Hardened steel Inorganic materials 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
- C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
-
- 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
- B22F3/02—Compacting only
-
- 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
- B22F3/105—Sintering only by using electric current other than for infrared radiant energy, laser radiation or plasma ; by ultrasonic bonding
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- 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
- C22C1/051—Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor
-
- 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
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
Abstract
The invention belongs to the technical field of superhard cutting tools, and relates to WC-Co-cBN composite hard alloy and a preparation method thereof. The WC-Co-cBN composite hard alloy comprises the following chemical components in percentage by weight: 70 to 90 percent of superfine/nano WC powder, 3 to 15 percent of Co powder, 0.35 to 0.75 percent of grain inhibitor, 1 to 10.75 percent of cBN micro powder with a layer of metal Mo, Ni or Ti film plated on the surface and having excellent high-temperature chemical stability, and 0.25 to 5 percent of spherical mixed powder selected from Al, Ni, Cr, Y or the combination thereof, wherein the components are prepared into the composite hard alloy by spark plasma sintering. The alloy prepared by the invention has fine grain size, high hardness, strength and toughness and good wear resistance, can overcome the difficulty of low thermal stability of dry cutting, reduces the processing cost, and is particularly suitable for high-performance machining cutting tools.
Description
Technical Field
The invention belongs to the technical field of superhard cutting tools, and particularly relates to WC-Co-cBN composite hard alloy and a preparation method thereof.
background
cBN is a material with second order hardness and thermal conductivity to diamond, has hardness and thermal conductivity far higher than WC, has high wear resistance, and is a popular research material in the fields of finishing cutters, dry cutting cutters, grinding wheel product preparation and the like.
At present, cBN doped WC-Co hard alloy has been reported, wherein the cBN addition amount in a hard alloy system is higher (volume ratio is more than 20 vol%), meanwhile, more coarse-grained cBN powder (more than 3 mu m) is adopted, and the content of binder phase Co is lower (<10 wt%). The thicker cBN is not easy to generate phase transformation in the process of hard alloy densification sintering, the finer the granularity of the cBN, the more active the surface, the more prone the phase transformation to occur in the sintering process, and the higher Co content can promote the transformation of the cBN to the graphite hBN along with the occurrence of the dissolution-precipitation process in the liquid phase sintering process, so that the problems are unfavorable for the performance of the reinforced hard alloy.
furthermore, cBN, as a hardening agent, is poor in wettability with WC/Co. First, in liquid phase sintering, cBN (coefficient of thermal expansion of 2.0X 10)-6/℃，Melting point 3500K) and WC-Co (thermal expansion coefficient 4.5X 10)-6/℃～7.1×10-6/° c, the melting point of the Co phase is about 1600K), and direct addition is easy to generate a plurality of pores in the sintered body, has poor metallurgical effect on the interface, and deteriorates the performance of the composite material; secondly, boron in the cBN has certain affinity with cobalt, and the boron and the cobalt react to generate boride of the cobalt; thirdly, when sintered at the conventional WC-Co liquid phase sintering temperature (about 1400 ℃), the superhard cubic boron nitride is transformed into low-hardness hexagonal phase boron nitride particles during the dissolution-precipitation process of Co, and the transformation process is accelerated by the presence of liquid phase cobalt.
At present, relevant literature studies show that: through cBN coating modification, solid-phase sintering and other improvement measures, the metallurgical bonding force between cBN and WC/Co can be improved, the thermal stability and the crystal structure state of the cBN are kept, and therefore the comprehensive performance of the cBN composite hard alloy is improved. But the problems of low density of WC-Co-cBN hard alloy, cBN particle shedding, poor cBN thermal stability and the like still exist.
The WC-Co-cBN hard alloy provided by the invention integrates the methods and ways of cBN modification, solid-phase sintering, grain refinement, wetting agent addition and the like, not only can keep the characteristics of high strength, high hardness and high wear resistance of the WC-Co hard alloy, but also improves the defect of low dry cutting thermal stability, reduces the processing cost, is an important development direction for currently developing novel cutting tool materials, and has great commercial value.
Disclosure of Invention
Aiming at the problems of the existing cBN doped WC-Co hard alloy, the invention provides a WC-Co-cBN composite hard alloy and a preparation method thereof.
The WC-Co-cBN composite hard alloy comprises the following chemical components in percentage by weight: 70 to 90 percent of superfine/nano WC powder, 3 to 15 percent of Co powder, 0.35 to 0.75 percent of grain inhibitor, 1 to 10.75 percent of hardening agent and 0.25 to 5 percent of wetting agent;
Wherein, the superfine/nano WC powder is taken as a substrate, and the Fisher particle size is less than 0.6 mu m;
Co powder is adhesive, and the Fisher size is less than 1.0 μm.
the grain inhibitor is TaC, VC or Cr3C2and TiC.
The hardening agent is cBN micro powder with a layer of metal Mo, Ni or Ti film with excellent high-temperature chemical stability plated on the surface of the powder, and the Fisher particle size is 1-2 mu m.
The wetting agent is a spherical mixed powder selected from Al, Ni, Cr, Y or a combination thereof, and the Fisher particle size is 1-2 μm.
the preparation method of the WC-Co-cBN composite hard alloy mainly comprises the following steps:
(1) Mixing and ball milling: mixing WC powder, Co powder and a crystal grain inhibitor, performing ball milling for 24-48 h, adding cBN powder, continuing ball milling for 2-8 h under the same ball milling parameters, and finally adding a wetting agent and performing ball milling for 0.5-2 h;
the ball milling technology adopted is rolling wet milling, the ball milling medium is absolute ethyl alcohol, the milling balls are YG8 round balls (phi 6), the ball-material ratio is 4:1, and the ball milling rotating speed is 60 r/min.
(2) And (3) vacuum drying: the temperature is 60-90 ℃, the vacuum degree is 0-0.1 Pa, and the time is 5-10 h.
(3) Sieving and pressing: 15g of the sieved mixture is weighed each time and placed in a graphite mold, and wafers with the diameter of phi 20mm multiplied by 5mm are pressed in advance.
(4) And (3) sintering: and (3) adopting a discharge plasma sintering process, wherein the heating rate is 80-200 ℃/min, the sintering pressure is 30-40 MPa, the sintering temperature is 1000-1350 ℃, the heat preservation time is 2-12 min, and cooling along with the furnace.
the invention has the following beneficial effects:
1. the alloy prepared by the invention has the advantages that the cBN has good thermal stability, no phase change occurs, the coating modification and wetting agent effect is good, the metallurgical acting force between the cBN and WC/Co is strong, the particle strengthening effect is obvious, the alloy compactness is favorably improved, and the comprehensive mechanical property is improved.
2. the preparation method provided by the invention adopts the processes of grain inhibitor, solid-phase sintering and ball milling, is beneficial to inhibiting the growth of WC grains, keeps the integrity of cBN grains, forms a uniformly distributed mixed crystal structure, can effectively prevent the further expansion of the defects such as cracks and the like, and ensures that the alloy has small grain size, high hardness, high strength, good toughness and good wear resistance.
3. the WC-Co-cBN hard alloy prepared by the invention not only can keep the high strength, high hardness, high wear resistance and high toughness of the WC-Co hard alloy, but also can overcome the difficulty of low dry cutting thermal stability, reduce the processing cost, improve the processing precision and the processing efficiency, and is suitable for hard alloy cutting tools of hard processing materials such as hardened steel, titanium alloy, high-temperature alloy, high-strength nodular cast iron, composite materials and the like.
Drawings
FIG. 1: a scanning electron microscope microstructure of cBN powder with a Mo film plated on the surface.
FIG. 2: scanning electron microscope microstructure of wetting agent 6AlY24Cr70Ni powder.
FIG. 3: WC-12Co-cBN composite hard alloy fracture scanning electron microscope microstructure,
wherein, a: WC and cBN crystal grain distribution topography map; b: a graph of cBN particle morphology and interface morphology; c: and (5) a fracture crack topography.
Detailed Description
the invention provides a WC-Co-cBN composite hard alloy and a preparation method thereof, wherein the WC-Co-cBN composite hard alloy mainly comprises a WC powder substrate, a Co powder binder, a grain inhibitor, a hardening agent and a wetting agent, and is prepared into the composite hard alloy through spark plasma sintering. The invention is further described with reference to the following figures and detailed description.
example 1:
1) Weighing: 82.9 percent of WC powder (with a Fisher size of 0.4 mu m), 12 percent of Co powder (with a Fisher size of 0.8 mu m), 0.35 percent of VC powder and 0.25 percent of Cr by mass fraction3C2Powder, 4% of cBN powder with Mo plated on the surface (original Fisher size 2 μm, as shown in FIG. 1), 0.5% of 6AlY24Cr70Ni spherical powder (as shown in FIG. 2).
2) Mixing and ball milling: weighing WC powder, Co powder, VC powder and Cr powder according to the proportion3C2Adding the powder into a rolling ball milling tank, wherein the ball milling medium is absolute ethyl alcohol, and the grinding balls are YG8 round balls(phi 6) the ball-material ratio is 4:1, the ball milling speed is 60r/min, and the ball milling is carried out for 36 h; then adding cBN powder with Mo plated on the surface in proportion, and continuing ball milling for 3 hours under the same ball milling parameters; finally, 6AlY24Cr70Ni powder is added and ball milled for 1 h.
3) And (3) vacuum drying: the drying temperature is 85 ℃, the vacuum degree is-0.1 Pa, and the drying time is 7 h.
4) Sieving: and sieving the mixture after vacuum drying by adopting a (-80) mesh sieve.
5) Pressing: 15g of the sieved mixture is weighed each time and placed in a graphite mold, and wafers with the diameter of phi 20mm multiplied by 5mm are pressed in advance.
6) And (3) sintering: during the sintering of the discharge plasma, the temperature rising rate is set to be 100 ℃/min, the sintering pressure is set to be 40MPa, the sintering temperature is 1250 ℃, the heat preservation time is 5min, the sintering temperature is cooled along with the furnace, and the pressure is relieved to 20MPa at 800 ℃.
7) Sample preparation: the desired test sample was prepared by appropriate machining and polishing.
The WC-12Co-cBN composite hard alloy prepared by the embodiment has the fracture scanning electron microscope microstructure of the WC-12Co-cBN composite hard alloy shown in figure 3, the cBN particles have good integrity and strong metallurgical acting force of an interface, a uniformly distributed mixed crystal structure is formed, further expansion of defects such as cracks can be effectively prevented, the WC grain size is 0.18 mu m, and the hardness is HV102080, the density is more than 99.9%.
Claims (2)
1. A preparation method of WC-Co-cBN composite hard alloy is characterized by mainly comprising the following steps:
(1) weighing: weighing raw materials according to the formula composition of the WC-Co-cBN composite hard alloy;
(2) Mixing and ball milling: mixing WC powder, Co powder and a crystal grain inhibitor, performing ball milling for 24-48 h, adding cBN powder, continuing ball milling for 2-8 h under the same ball milling parameters, and finally adding a wetting agent and performing ball milling for 0.5-2 h;
Wherein the adopted ball milling technology is rolling wet milling, the ball milling medium is absolute ethyl alcohol, the grinding balls are YG8 balls, the ball-material ratio is 4:1, and the ball milling speed is 60 r/min;
The wetting agent is spherical mixed powder selected from Al, Ni, Cr, Y or a combination thereof, and the Fisher particle size is 1-2 mu m;
(3) and (3) vacuum drying: the temperature is 60-90 ℃, the vacuum degree is 0-minus 0.1Pa, and the time is 5-10 h;
(4) Sieving: sieving the mixture after vacuum drying;
(5) Pressing: weighing 15g of sieved mixture each time, placing the mixture in a graphite mold, and pressing into a wafer with the diameter of phi 20mm multiplied by 5mm in advance;
(6) And (3) sintering: adopting a discharge plasma sintering process, wherein the heating rate is 80-200 ℃/min, the sintering pressure is 30-40 MPa, the sintering temperature is 1000-1350 ℃, the heat preservation time is 2-12 min, and cooling along with the furnace;
(7) sample preparation: preparing a required test sample by proper machining and polishing;
The WC-Co-cBN composite hard alloy comprises the following chemical components in percentage by weight: 70-90% of nano WC powder, 3-15% of Co powder, 0.35-0.75% of grain inhibitor, 1-10.75% of hardening agent cBN powder and 0.25-5% of wetting agent;
Wherein, the nanometer WC powder is taken as a substrate, and the Fisher particle size is less than 0.6 mu m;
Co powder is a binder, and the Fisher particle size is less than 1.0 mu m;
The hardening agent is cBN micro powder with a layer of metal Mo, Ni or Ti film with excellent high-temperature chemical stability plated on the surface of the powder, and the Fisher particle size is 1-2 mu m.
2. The method of claim 1, wherein the grain inhibitor is TaC, VC, Cr3C2And TiC.
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| CN107739950B true CN107739950B (en) | 2019-12-17 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108467983A (en) * | 2018-03-07 | 2018-08-31 | 河源华盈科技有限公司 | Using submicron order TaC and Cr3C2Ti (C, the N) base metal-ceramic materials and preparation method of enhancing |
| CN108624772B (en) * | 2018-06-26 | 2020-12-18 | 南京理工大学 | Ultra-fine grain tungsten carbide-based hard alloy material and preparation method thereof |
| CN109022997A (en) * | 2018-09-14 | 2018-12-18 | 河源富马硬质合金股份有限公司 | A kind of high tough high-wearing feature polycrystalline cemented carbide material |
| CN109202070A (en) * | 2018-10-25 | 2019-01-15 | 湖南工业大学 | A kind of hard alloy forming method based on cooled |
| CN109266940B (en) * | 2018-10-26 | 2021-04-09 | 南方科技大学 | Carbon-tungsten-cobalt composite material and preparation method and application thereof |
| CN109439994B (en) * | 2018-12-12 | 2021-08-10 | 长沙黑金刚实业有限公司 | Grinding material, preparation method, use method and prepared product |
| CN110253028A (en) * | 2019-07-16 | 2019-09-20 | 湖南伊澍智能制造有限公司 | A kind of self-lubricating 3D printing alloy powder and preparation method thereof |
| EP4076798A1 (en) * | 2019-12-20 | 2022-10-26 | AB Sandvik Coromant | A cutting tool |
| CN111545745A (en) * | 2020-05-19 | 2020-08-18 | 马鞍山市恒泰重工机械有限公司 | Centrifugal composite roller surface high-temperature-resistant coating and production process thereof |
| CN112080661B (en) * | 2020-09-02 | 2021-04-02 | 四川大学 | Preparation method of superfine hard alloy |
| CN112143953A (en) * | 2020-09-25 | 2020-12-29 | 江西江钨硬质合金有限公司 | High-performance non-uniform structure hard alloy and preparation method thereof |
| CN113059157B (en) * | 2021-03-09 | 2022-11-25 | 南京理工大学 | Method for sintering superfine crystal WC-based hard alloy special-shaped cutter under SPS pressure |
| CN114150201B (en) * | 2021-12-02 | 2022-05-17 | 湖南人文科技学院 | Preparation method of superhard CoWB-Co hard alloy |
| CN115846668A (en) * | 2022-11-04 | 2023-03-28 | 安徽尚欣晶工新材料科技有限公司 | Hard alloy material for optical die and preparation method thereof |
| CN115927946A (en) * | 2022-12-28 | 2023-04-07 | 富耐克超硬材料股份有限公司 | Preparation method of wear-resistant hard alloy composite material |
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| CN106521432A (en) * | 2015-09-09 | 2017-03-22 | 北京有色金属研究总院 | Method for cubic boron nitride micro-powder particle surface metallization modifying |
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| CN106521432A (en) * | 2015-09-09 | 2017-03-22 | 北京有色金属研究总院 | Method for cubic boron nitride micro-powder particle surface metallization modifying |
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