CN112077301A - Method for coating diamond with metal powder - Google Patents
Method for coating diamond with metal powder Download PDFInfo
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- CN112077301A CN112077301A CN201911019350.1A CN201911019350A CN112077301A CN 112077301 A CN112077301 A CN 112077301A CN 201911019350 A CN201911019350 A CN 201911019350A CN 112077301 A CN112077301 A CN 112077301A
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- diamond
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Classifications
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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
- B22F1/17—Metallic particles coated with metal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
-
- 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
- B22F1/102—Metallic powder coated with 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
- 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
- B22F3/1007—Atmosphere
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/25—Diamond
- C01B32/28—After-treatment, e.g. purification, irradiation, separation or recovery
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/07—Alloys based on nickel or cobalt based on cobalt
Abstract
The invention discloses a method for coating diamond with metal powder, and particularly relates to the technical field of diamond treatment, and the method comprises the following specific steps: s1, preprocessing; s2, coating an oily adhesive; s3, coating metal powder; s4, drying; s5, granulating; s6, drying and sieving; s7, vibration screening; and S8, sintering. The coated diamond has higher holding force and higher utilization rate, the weight of the coated diamond can be increased to 500 percent, the volume is increased, the surface area is increased, the contact area with matrix powder is larger, the utilization rate of the diamond is effectively improved, and meanwhile, any organic solvent of liquid paraffin, alcohol or isopropanol is used as an oily adhesive, so that toxic and high-pollution organic solvents such as toluene are not used, the coated diamond is non-toxic and harmless, and the safety is improved.
Description
Technical Field
The invention relates to the technical field of diamond treatment, in particular to a method for coating diamond by metal powder.
Background
The fundamental idea in the manufacture of diamond tools by powder metallurgy is to create a suitable binder (also called matrix) to firmly wrap diamond particles (holding force) and make them play a role in cutting or grinding a workpiece, and the binders are generally classified into three categories: the diamond tool is mainly composed of a metal bonding agent, a resin bonding agent and a ceramic bonding agent, wherein the diamond tool of the metal bonding agent is most widely used, and the wettability and the welding force of metal alloy to diamond are key technologies of the manufacturing process of the diamond tool.
Experiments show that common low-melting-point pure metal elements are not infiltrated to diamond, if a small amount of strong carbide forming elements such as Ti, Zr, Cr, W, Si and the like are added into the elements, the infiltration of the alloy to the diamond is greatly improved, although the holding force of a matrix to the diamond is improved by adding the strong carbide forming elements, because the sintering temperature of a diamond tool is generally not more than 920 ℃, the high-temperature sintering time is generally not more than 1 hour, and the volume concentration of the diamond is generally not more than 40%, the diffusion of strong carbide forming element atoms in matrix powder is limited, the atoms close to the diamond can be diffused to the surface of the diamond, the atoms far away from the diamond cannot be diffused for a long distance, the element utilization rate is low, in order to improve the holding force, the adding proportion of the strong carbide forming elements is generally not too high, and because the strong carbide forming elements also generally, if the amount is too high, abrasion of the carcass may be caused, cutting efficiency of the tool may be lowered, and the tool may not be used.
There is a need for a method of coating diamond with metal powder.
Disclosure of Invention
In order to overcome the above-mentioned defects of the prior art, embodiments of the present invention provide a method for coating diamond with metal powder, which has a higher holding force of the coated diamond, a higher utilization rate of the diamond, a weight increase of the coated diamond of up to 500%, a larger volume, a larger surface area, a larger contact area with the matrix powder, and a more effective improvement in the utilization rate of the diamond, and simultaneously, by using any one of organic solvents such as liquid paraffin, alcohol, and isopropyl alcohol as an oily binder, without using toxic and highly polluting organic solvents such as toluene, is non-toxic and harmless, and improves safety.
In order to achieve the purpose, the invention provides the following technical scheme: a method for coating diamond with metal powder comprises the following steps:
s1, preprocessing: cleaning the surface of the diamond by using dilute hydrochloric acid, and boiling the cleaned diamond by using dilute nitric acid to perform roughening treatment;
s2, coating oil adhesive: coating a layer of oily adhesive on the surface of the diamond, wherein the oily adhesive can completely cover and infiltrate the surface of the diamond due to the oleophilicity of the surface of the diamond, and the oily adhesive is any one of liquid paraffin, alcohol or isopropanol;
s3, coating metal powder: when the surface of the diamond is coated with the oily adhesive, a layer of metal powder is coated to be uniformly adhered to the surface of the diamond;
s4, drying: when the powder coated on the surface of the diamond accounts for 20-60% of the total weight, taking out the coated diamond and drying the diamond by using a dryer;
s5, granulating: pouring the metal powder used for coating and the dried coated diamond into a granulator together, and granulating in a rolling mode to further wrap the metal powder on the surface of the sintered diamond;
s6, drying and sieving: drying the diamond prepared in the step S4 by using a dryer, and then sieving the dried diamond by using a screen mesh so as to break up the aggregation of large diamond particles;
s7, vibration screening: screening the coated diamond prepared by the S5 in a vibrating machine to obtain the coated diamond meeting the granularity requirement, wherein the coating rate accounts for 200-500% of the weight of the original diamond;
s8, sintering: the coated diamond obtained in S6 was sintered in an atmosphere furnace.
In a preferred embodiment, the diamond particle size is 25-100 mesh in step S1.
In a preferred embodiment, the oily binder in step S2 is an oily binder decomposable at 500 ℃.
In a preferred embodiment, the apparatus used in steps S2 and S3 is a DIEX diamond wrapping machine.
In a preferred embodiment, the formulation of the metal powder in step S3 has the following:
a: pure cobalt powder with a Fisher size of 0.6-1.5 meshes;
b: the mixed powder of cobalt powder and silver powder, the cobalt powder has a Fisher size of 0.6-1.5 meshes, the silver powder accounts for 1-12%, and the particle size is 325-1000 meshes;
c: the alloy powder comprises the following elements in percentage by weight: 0.2 to 1.2 percent of Cr0.1 to 0.8 percent of Si0.5 to 2 percent of Ti0.5 to 2 percent of Ti, and the balance of Fe, Co and Ni, wherein the powder has the granularity as fine as possible and generally needs to be 325 meshes.
In a preferred embodiment, the screening principle in step S7 is that the diamond density is 3.52g/cm2The coated powder has a density much higher than that of diamond, and if the granulated particles do not contain diamond, the coated powder may have a size consistent with that of the particles containing diamond, but have a large weight difference, and the particles of powder-coated diamond can be screened by a vibrating machine.
In a preferred embodiment, the sintering temperature is 600-900 ℃ and the sintering time is 0.5-1h in step S8, and the atmosphere during sintering can be pure hydrogen or a reducing atmosphere for decomposing ammonia.
The invention has the technical effects and advantages that:
1. compared with the diamond surface metallization treatment in the prior art, the metal layer on the diamond surface in the prior art is several microns to dozens of microns, the volume growth rate of the metallized diamond surface is low, the weight is only increased by 3-5% like common titanium-plated diamond with 30-60 meshes, the holding force of the coated diamond is higher, the utilization rate of the diamond is also higher, the weight of the coated diamond is increased by 500%, the volume is increased, the surface area is increased, the contact area with matrix powder is larger, and the utilization rate of the diamond is more effectively improved;
2. according to the invention, any one of the organic solvent of liquid paraffin, alcohol or isopropanol is used as the oily adhesive, and the toxic and high-pollution organic solvent such as toluene is not used, so that the adhesive is non-toxic and harmless, and the safety is improved;
3. the invention screens the coated diamond by the vibrating machine, can accurately screen the coating rate of the diamond, namely the weight growth rate, has positive effect on process control, and meanwhile, when the coated diamond is sintered at high temperature in an atmosphere furnace and is used again to be added into a matrix for pressing and forming, the sintered diamond has certain strength, and the powder wrapped outside the diamond can not be crushed and lose effect in the forming process.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
the invention provides a method for coating diamond with metal powder, which comprises the following steps:
s1, preprocessing: selecting diamond with the granularity of 25 meshes, cleaning the surface of the diamond by using dilute hydrochloric acid, and boiling the cleaned diamond by using dilute nitric acid to perform roughening treatment;
s2, coating oil adhesive: coating a layer of oily adhesive on the surface of the diamond, wherein the oily adhesive can completely cover and infiltrate the surface of the diamond due to the oleophilicity of the surface of the diamond, the oily adhesive is liquid paraffin, the oily adhesive can be decomposed at 500 ℃, and a diamond wrapping machine using DIEX is used for coating;
s3, coating metal powder: when the surface of the diamond is coated with the oily adhesive, a layer of metal powder is coated to be uniformly adhered to the surface of the diamond, a DIEX diamond wrapping machine is used for coating, and the formula of the metal powder is pure cobalt powder with the Fisher particle size of 0.6 mesh;
s4, drying: when the powder coated on the surface of the diamond accounts for 20 percent of the total weight, taking out the coated diamond and drying the diamond by using a dryer;
s5, granulating: pouring the metal powder used for coating and the dried coated diamond into a granulator together, and granulating in a rolling mode to further wrap the metal powder on the surface of the sintered diamond;
s6, drying and sieving: drying the diamond prepared in the step S4 by using a dryer, and then sieving the dried diamond by using a screen mesh so as to break up the aggregation of large diamond particles;
s7, vibration screening: the coated diamond prepared by S5 is screened out by a shaker to meet the requirement of granularity, the coating rate accounts for 200 percent of the original diamond weight, and the screening principle is that the diamond density is 3.52g/cm2The density of the coating powder is far greater than that of diamond, if the granulated particles do not contain diamond, the size of the coated powder can be consistent with that of the particles containing diamond, but the weight difference is large, and the particles of which the powder wraps the diamond can be screened out by a method of a vibrating machine;
s8, sintering: and (3) sintering the coated diamond obtained in the step (S6) in an atmosphere furnace, wherein the sintering temperature is 600 ℃, the sintering time is 0.5h, and the atmosphere during sintering can be pure hydrogen or reducing atmosphere for decomposing ammonia.
Example 2:
the invention provides a method for coating diamond with metal powder, which comprises the following steps:
s1, preprocessing: selecting diamond with the granularity of 63 meshes, cleaning the surface of the diamond by using dilute hydrochloric acid, and boiling the cleaned diamond by using dilute nitric acid to perform roughening treatment;
s2, coating oil adhesive: coating a layer of oily adhesive on the surface of the diamond, wherein the oily adhesive can completely cover and infiltrate the surface of the diamond due to the oleophilicity of the surface of the diamond, the oily adhesive is alcohol, the oily adhesive can be decomposed at 500 ℃, and a diamond wrapping machine using DIEX is coated;
s3, coating metal powder: when the surface of the diamond is coated with the oily adhesive, a layer of metal powder is coated to be uniformly adhered to the surface of the diamond, a DIEX diamond wrapping machine is used for coating, the formula of the metal powder is mixed powder of cobalt powder and silver powder, the Fisher granularity of the cobalt powder is 1.0 mesh, the silver powder accounts for 6 percent, and the particle size is 700 mesh;
s4, drying: when the powder coated on the surface of the diamond accounts for 40 percent of the total weight, taking out the coated diamond and drying the diamond by using a dryer;
s5, granulating: pouring the metal powder used for coating and the dried coated diamond into a granulator together, and granulating in a rolling mode to further wrap the metal powder on the surface of the sintered diamond;
s6, drying and sieving: drying the diamond prepared in the step S4 by using a dryer, and then sieving the dried diamond by using a screen mesh so as to break up the aggregation of large diamond particles;
s7, vibration screening: the coated diamond prepared by S5 is screened out by a shaker to meet the requirement of granularity, the coating rate accounts for 350 percent of the original diamond weight, and the screening principle is that the diamond density is 3.52g/cm2The density of the coating powder is far greater than that of diamond, if the granulated particles do not contain diamond, the size of the coated powder can be consistent with that of the particles containing diamond, but the weight difference is large, and the particles of which the powder wraps the diamond can be screened out by a method of a vibrating machine;
s8, sintering: and (3) sintering the coated diamond obtained in the step (S6) in an atmosphere furnace, wherein the sintering temperature is 750 ℃, the sintering time is 0.75h, and the atmosphere during sintering can be pure hydrogen or reducing atmosphere for decomposing ammonia.
Example 3:
the invention provides a method for coating diamond with metal powder, which comprises the following steps:
s1, preprocessing: selecting diamond with the granularity of 100 meshes, cleaning the surface of the diamond by using dilute hydrochloric acid, and boiling the cleaned diamond by using dilute nitric acid to perform roughening treatment;
s2, coating oil adhesive: coating a layer of oily adhesive on the surface of the diamond, wherein the oily adhesive can completely cover and infiltrate the surface of the diamond due to the oleophilicity of the surface of the diamond, the oily adhesive is isopropanol and can be decomposed at 500 ℃, and a diamond wrapping machine using DIEX is used for coating;
s3, coating metal powder: when the surface of the diamond is coated with the oily adhesive, a layer of metal powder is coated to be uniformly adhered to the surface of the diamond, a DIEX diamond wrapping machine is used for coating, the formula of the metal powder is alloy powder, and the element content is as follows: 0.7 percent of Cr0.4 percent of Si, 1 percent of Ti and the balance of Fe, Co and Ni, wherein the powder has the granularity which is as fine as possible and is generally required to be-325 meshes;
s4, drying: when the powder coated on the surface of the diamond accounts for 60 percent of the total weight, taking out the coated diamond and drying the diamond by using a dryer;
s5, granulating: pouring the metal powder used for coating and the dried coated diamond into a granulator together, and granulating in a rolling mode to further wrap the metal powder on the surface of the sintered diamond;
s6, drying and sieving: drying the diamond prepared in the step S4 by using a dryer, and then sieving the dried diamond by using a screen mesh so as to break up the aggregation of large diamond particles;
s7, vibration screening: the coated diamond prepared by S5 is screened out by a shaker to meet the requirement of granularity, the coating rate accounts for 500 percent of the original diamond weight, and the screening principle is that the diamond density is 3.52g/cm2The density of the coating powder is far greater than that of diamond, if the granulated particles do not contain diamond, the size of the coated powder can be consistent with that of the particles containing diamond, but the weight difference is large, and the particles of which the powder wraps the diamond can be screened out by a method of a vibrating machine;
s8, sintering: and (3) sintering the coated diamond obtained in the step (S6) in an atmosphere furnace, wherein the sintering temperature is 900 ℃, the sintering time is 1h, and the atmosphere during sintering can be pure hydrogen or reducing atmosphere for decomposing ammonia.
Example 4:
the invention provides a method for coating diamond with metal powder, which comprises the following steps:
s1, preprocessing: selecting diamond with the granularity of 100 meshes, cleaning the surface of the diamond by using dilute hydrochloric acid, and boiling the cleaned diamond by using dilute nitric acid to perform roughening treatment;
s2, coating oil adhesive: coating a layer of oily adhesive on the surface of the diamond, wherein the oily adhesive can completely cover and infiltrate the surface of the diamond due to the oleophilicity of the surface of the diamond, the oily adhesive is isopropanol and can be decomposed at 500 ℃, and a diamond wrapping machine using DIEX is used for coating;
s3, coating metal powder: when the surface of the diamond is coated with the oily adhesive, a layer of metal powder is coated to be uniformly adhered to the surface of the diamond, a DIEX diamond wrapping machine is used for coating, the formula of the metal powder is alloy powder, and the element content is as follows: cr1.2 percent, Si0.8 percent, Ti2 percent and the balance of Fe, Co and Ni, wherein the powder is required to have the granularity as fine as possible and is generally required to be-325 meshes;
s4, drying: when the powder coated on the surface of the diamond accounts for 60 percent of the total weight, taking out the coated diamond and drying the diamond by using a dryer;
s5, granulating: pouring the metal powder used for coating and the dried coated diamond into a granulator together, and granulating in a rolling mode to further wrap the metal powder on the surface of the sintered diamond;
s6, drying and sieving: drying the diamond prepared in the step S4 by using a dryer, and then sieving the dried diamond by using a screen mesh so as to break up the aggregation of large diamond particles;
s7, vibration screening: the coated diamond prepared by S5 is screened out by a shaker to meet the requirement of granularity, the coating rate accounts for 500 percent of the original diamond weight, and the screening principle is that the diamond density is 3.52g/cm2The density of the coating powder is far greater than that of diamond, if the granulated particles do not contain diamond, the size of the coated powder can be consistent with that of the particles containing diamond, but the weight difference is large, and the particles of which the powder wraps the diamond can be screened out by a method of a vibrating machine;
s8, sintering: and (3) sintering the coated diamond obtained in the step (S6) in an atmosphere furnace, wherein the sintering temperature is 900 ℃, the sintering time is 1h, and the atmosphere during sintering can be pure hydrogen or reducing atmosphere for decomposing ammonia.
Example 5:
wrapping 120 diamonds by the methods of the above examples 1 to 4 respectively, wherein each 30 diamonds is one group, the methods of the four examples are tried in four groups respectively, and after wrapping, the following data are obtained:
from the above table, the method in example 3 is suitable, and the weight of the diamond after the metallization treatment of the diamond surface is increased to the maximum extent by using the method, so that the surface area of the diamond is increased, the contact area of the diamond and the matrix powder is larger, and the utilization rate of the diamond is improved to the maximum extent.
And finally: the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention are intended to be included in the scope of the present invention.
Claims (7)
1. A method for coating diamond with metal powder, which is characterized by comprising the following steps: the method comprises the following specific steps:
s1, preprocessing: cleaning the surface of the diamond by using dilute hydrochloric acid, and boiling the cleaned diamond by using dilute nitric acid to perform roughening treatment;
s2, coating oil adhesive: coating a layer of oily adhesive on the surface of the diamond, wherein the oily adhesive can completely cover and infiltrate the surface of the diamond due to the oleophilicity of the surface of the diamond, and the oily adhesive is any one of liquid paraffin, alcohol or isopropanol;
s3, coating metal powder: when the surface of the diamond is coated with the oily adhesive, a layer of metal powder is coated to be uniformly adhered to the surface of the diamond;
s4, drying: when the powder coated on the surface of the diamond accounts for 20-60% of the total weight, taking out the coated diamond and drying the diamond by using a dryer;
s5, granulating: pouring the metal powder used for coating and the dried coated diamond into a granulator together, and granulating in a rolling mode to further wrap the metal powder on the surface of the sintered diamond;
s6, drying and sieving: drying the diamond prepared in the step S4 by using a dryer, and then sieving the dried diamond by using a screen mesh so as to break up the aggregation of large diamond particles;
s7, vibration screening: screening the coated diamond prepared by the S5 in a vibrating machine to obtain the coated diamond meeting the granularity requirement, wherein the coating rate accounts for 200-500% of the weight of the original diamond;
s8, sintering: the coated diamond obtained in S6 was sintered in an atmosphere furnace.
2. A method of metal powder coated diamond according to claim 1, wherein: the diamond particle size is 25-100 mesh in step S1.
3. A method of metal powder coated diamond according to claim 1, wherein: the oily binder in step S2 is selected from oily binders decomposable at 500 ℃.
4. A method of metal powder coated diamond according to claim 1, wherein: the apparatus used in steps S2 and S3 is a DIEX diamond wrapping machine.
5. A method of metal powder coated diamond according to claim 1, wherein: the formulations of the metal powder in step S3 are as follows:
a: pure cobalt powder with a Fisher size of 0.6-1.5 meshes;
b: the mixed powder of cobalt powder and silver powder, the cobalt powder has a Fisher size of 0.6-1.5 meshes, the silver powder accounts for 1-12%, and the particle size is 325-1000 meshes;
c: the alloy powder comprises the following elements in percentage by weight: 0.2 to 1.2 percent of Cr0.1 to 0.8 percent of Si0.5 to 2 percent of Ti0.5 to 2 percent of Ti, and the balance of Fe, Co and Ni, wherein the powder has the granularity as fine as possible and generally needs to be 325 meshes.
6. A method of metal powder coated diamond according to claim 1, wherein: the screening principle in step S7 was that the diamond density was 3.52g/cm2The coated powder has a density much higher than that of diamond, and if the granulated particles do not contain diamond, the coated powder may have a size consistent with that of the particles containing diamond, but have a large weight difference, and the particles of powder-coated diamond can be screened by a vibrating machine.
7. A method of metal powder coated diamond according to claim 1, wherein: in step S8, the sintering temperature is 600-900 ℃, the sintering time is 0.5-1h, and the atmosphere during sintering can be pure hydrogen or reducing atmosphere for decomposing ammonia.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113020592A (en) * | 2021-03-22 | 2021-06-25 | 中原工学院 | Preparation method and application of ceramic particle surface-coated metal powder composite material |
| CN113151903A (en) * | 2021-03-09 | 2021-07-23 | 河南黄河旋风股份有限公司 | Method for roughening diamond surface |
| WO2023024570A1 (en) * | 2021-08-26 | 2023-03-02 | 华为技术有限公司 | Diamond-based thermally conductive filler and preparation method, composite thermally conductive material and electronic device |
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| CN108855886A (en) * | 2018-06-26 | 2018-11-23 | 江苏信实精密工具有限公司 | A kind of diamond particles device for vibration screening |
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| CN1074951A (en) * | 1991-09-20 | 1993-08-04 | 通用电气公司 | Two coating diamond pellets and saw blade segments goods thereof |
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| WO2023024570A1 (en) * | 2021-08-26 | 2023-03-02 | 华为技术有限公司 | Diamond-based thermally conductive filler and preparation method, composite thermally conductive material and electronic device |
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