CN110524442B - Porous diamond polycrystalline abrasive and preparation method thereof - Google Patents
Porous diamond polycrystalline abrasive and preparation method thereof Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
- B24D18/0009—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for using moulds or presses
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
- B24D3/02—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent
- B24D3/04—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic
- B24D3/06—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic metallic or mixture of metals with ceramic materials, e.g. hard metals, "cermets", cements
- B24D3/10—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic metallic or mixture of metals with ceramic materials, e.g. hard metals, "cermets", cements for porous or cellular structure, e.g. for use with diamonds as abrasives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
- B24D3/34—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties
- B24D3/346—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties utilised during polishing, or grinding operation
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
- C09K3/1409—Abrasive particles per se
- C09K3/1427—Abrasive particles per se obtained by division of a mass agglomerated by melting, at least partially, e.g. with a binder
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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B28/00—Production of homogeneous polycrystalline material with defined structure
- C30B28/02—Production of homogeneous polycrystalline material with defined structure directly from the solid state
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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/02—Elements
- C30B29/04—Diamond
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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B33/00—After-treatment of single crystals or homogeneous polycrystalline material with defined structure
- C30B33/08—Etching
- C30B33/10—Etching in solutions or melts
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Abstract
The invention belongs to the technical field of raw and auxiliary materials for producing superhard materials, and particularly relates to a porous diamond polycrystalline grinding material and a preparation method thereof. The porous diamond polycrystalline grinding material with high wear resistance and high self-sharpening performance is prepared by penetrating the metal alloy into the diamond micro powder, and meanwhile, the good effect of sintering the common diamond micro powder as the raw material to prepare the high-quality polycrystalline diamond grinding material is realized. The grinding removal rate of the prepared porous diamond polycrystalline abrasive in tungsten-molybdenum alloy, niobium-tungsten alloy and other tungsten-containing alloy materials is 2-4 times that of common diamond products, no scratch is generated, and the high-temperature resistance is excellent, so that the stability is good, and the grinding life is long.
Description
Technical Field
The invention belongs to the technical field of raw and auxiliary materials for producing superhard materials, and particularly relates to a porous diamond polycrystalline grinding material and a preparation method thereof.
Background
In the field of static ultrahigh pressure technology, diamond abrasives are divided into single crystal diamond abrasives and polycrystalline diamond abrasives, and have the characteristics of high hardness, strong grinding capacity, small grinding force and grinding heat, and capability of ensuring grinding quality, high efficiency and long service life in grinding, so that the diamond abrasives are widely applied to processing of hard alloys, hard and brittle non-metallic materials, non-ferrous metals such as copper and aluminum, and alloy materials, and can also be applied to processing processes of soft and tough materials such as rubber and resin.
Due to the good application prospect and the polycrystalline structure of the polycrystalline diamond grinding material, the processing efficiency and the processing precision are both considered in workpiece grinding, and the processing strength is basically kept unchanged under the high-temperature condition. The existing preparation method of polycrystalline diamond abrasive is mainly characterized by that it utilizes the detonation method (also called explosion method) to produce polycrystalline diamond abrasive, and mainly utilizes the strong shock wave produced by detonation of strong explosives of trinitrotoluene (TNT) and hexogen (RDX) and others to act on graphite, and can obtain high pressure of several tens of GPa and high temperature of several thousand deg.C at the moment of several microseconds to make graphite be converted into diamond, and the product prepared by said method is small polycrystal with 5-20 nm. Meanwhile, the method has the advantages that equipment is not required to be invested, and the defect that the diamond recovery treatment process is complex.
Chinese patent publication No. CN108187587A discloses a pure-phase large-scale polycrystalline diamond, which is prepared by directly converting diamond micropowder with graphitized surface as a raw material without an additive under high temperature and high pressure conditions, and although this method can reduce temperature and pressure in the synthesis process, the pure-phase large-scale polycrystalline diamond is likely to cause cutting damage due to concentrated grinding heat and stress during cutting.
Therefore, it is highly desirable to develop a method for synthesizing polycrystalline diamond, which can reduce the synthesis conditions and facilitate the industrial production of polycrystalline diamond.
Disclosure of Invention
The invention aims to provide a preparation method of a polycrystalline diamond grinding material, which can ensure the quality of a porous diamond polycrystalline grinding material product and has the advantages of convenient operation and low cost.
It is another object of the present invention to produce the porous diamond polycrystalline abrasive.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for producing a porous diamond polycrystalline abrasive, comprising the steps of:
1) preparing a sheet metal bonding agent: pressing metal powder with the particle size less than or equal to 10 microns into a metal sheet, placing the metal sheet in a vacuum furnace at the temperature of 1500 ℃ and the vacuum degree of 1 multiplied by 10 of 1700 DEG-5Sintering for 2-4h under Pa to obtain a sheet metal bonding agent for later use;
2) preparing a pre-sintering mixture: extruding the diamond micropowder with the particle size of less than or equal to 30 microns into blocks, sequentially placing the blocks and the sheet-shaped metal binder prepared in the step 1) into a graphite heating pipe (the wall thickness is 0.8-1.2 mm) according to the sequence of the diamond micropowder blocks, the sheet-shaped metal binder and the diamond micropowder blocks to prepare a pre-sintered mixture with a 3-layer composite layer structure of the diamond micropowder blocks, the sheet-shaped metal binder and the diamond micropowder blocks; wherein the diamond micropowder block and the sheet metal binder prepared in the step 1) are 75-95 parts and 5-25 parts by weight respectively;
3) and (3) sintering: placing the graphite heating pipe containing the pre-sintering mixture in the step 2) in a high-pressure synthesis cavity (the cylinder diameter of the cubic press is 550-850 mm), sintering for 300s at the temperature of 1900 ℃ and under the pressure of 7-8GPa, and infiltrating the metal sheet into the diamond material layer at high temperature and high pressure to prepare the polycrystalline diamond sintered block material;
4) crushing: crushing the polycrystalline diamond sintered lump material prepared in the step 3) into polycrystalline diamond particles for later use;
5) removing the metal binding agent: mixing the polycrystalline diamond particles prepared in the step 4) with 20-30% by mass of strong acid aqueous solution, reacting for 24-48h at the temperature of 150-250 ℃, filtering out acid liquor, repeatedly washing with clear water to be neutral, and drying to obtain the porous diamond polycrystalline abrasive.
Specifically, the metal powder in the step 1) is cobalt powder, nickel powder or iron powder.
Specifically, the purity of the metal powder in the step 1) is more than 99.9%.
Specifically, the metal sheet in the step 1) is a metal circular sheet with the thickness of 1-10mm and the diameter of 15-30 mm.
Specifically, the grain size of the polycrystalline diamond grains obtained by crushing in the step 4) is less than 1 mm.
Specifically, the strong acid in the step 5) is sulfuric acid, nitric acid or hydrochloric acid.
Specifically, the weight ratio of the polycrystalline diamond particles to the strong acid aqueous solution in the step 5) is 1 (2-4).
The method adopts the principle that under ultrahigh pressure, a D-M-D structure is formed by penetrating metal alloy into diamond micro powder, and then a D-D structure mode is formed by pickling metal M in the diamond micro powder. The prepared polycrystalline diamond is worn in a mode that small-particle raw diamond particles fail to fall off, but the single crystal diamond particles with large particle sizes fall off integrally, so that the consumption rate of the grinding material is low, the surface damage to a processed workpiece is small, and the wear resistance is high. The self-sharpening property is good because it is not transgranular and cracked as in the case of the ruby single crystal diamond, because new diamond abrasive grains are exposed by the fatigue and fall off of the binder when the tool is formed with the binder. Meanwhile, the method realizes the good effect of sintering the common diamond micropowder as the raw material to prepare the high-quality polycrystalline diamond grinding material, has the advantages of convenient operation, high production efficiency, low cost and the like, and is suitable for large-scale production of the polycrystalline diamond grinding material.
The porous diamond polycrystalline abrasive prepared by the method can be used for SiC and Al2O3The thinning and polishing of the semiconductor wafer, the surface polishing of a ceramic material, or the surface polishing of a metal material such as stainless steel, aluminum alloy and the like.
According to the preparation method, the single large cutting edge of the diamond abrasive particles is thinned into the multi-cutting edge with the micro-nano size, the size of the cutting edge is reduced, the number of the cutting edges is increased, the grinding heat and the stress are dispersed, the cutting depth of the single cutting edge is reduced, the cutting damage is effectively reduced, and the surface processing quality is improved; in the processing process, the diamond abrasive particles can generate new micro cutting edges by local crushing per se, namely, new diamond abrasive particles are exposed, and the grinding tool can maintain higher sharpness without trimming, so that the aim of improving the grinding efficiency is fulfilled, and meanwhile, the crushing self-sharpening can be controlled by adjusting the surface corrosion degree of the diamond; compared with the common single crystal diamond abrasive grain, the polycrystalline diamond abrasive grain prepared by the invention has rough surface, increases effective contact area with the bonding agent, and ensures that the abrasive grain can not fall off in a whole grain under the embedding action of the polycrystalline diamond abrasive grain and the bonding agent. When the porous diamond polycrystalline abrasive material is used as an abrasive tool for grinding, abrasive particles are partially crushed layer by layer after a cutting edge of the abrasive particles on the surface of the abrasive tool is dull ground, and the abrasive particles are not randomly crushed or wholly fall off like ordinary diamond abrasive particles, namely, under the same condition, the number of the abrasive particles participating grinding on a grinding surface is more than that of the abrasive tool of the ordinary diamond abrasive material, and finally, the utilization rate and the grinding efficiency of diamond are improved.
The invention has the beneficial effects that:
1. the preparation method of the porous diamond polycrystalline abrasive material is obtained by the inventor through a large number of experimental researches on the basis of summarizing long-term practical experience. The method adopts the compounding of common diamond micro powder and metal alloy bonding agent, and the porous diamond polycrystalline abrasive with excellent performance is prepared by sintering under the condition of ultrahigh temperature and high pressure. Each grain of the abrasive is a polycrystalline structure formed by combining a plurality of fine diamond crystals, is suitable for processing ceramic materials, and can greatly improve the processing efficiency and the processing precision.
2. The grinding removal rate of the porous diamond polycrystalline grinding material prepared by the invention in tungsten-molybdenum alloy, niobium-tungsten alloy and other tungsten-containing alloy materials is 2-4 times that of common diamond products, no scratch is generated, the high temperature resistance is excellent, the common diamond starts to burn at about 850 ℃ in the air, and the porous diamond polycrystalline grinding material prepared by the invention starts to burn at about 950 ℃ in the air and has higher burning point, so the stability is better, and the grinding service life is good.
Drawings
FIG. 1 is a schematic diagram of a composite layer structure of diamond micropowder blocks and sheet metal binder in a synthetic cavity; in the figure, 1 is a graphite heating pipe, 2 is a sheet metal binder, and 3 is a diamond micropowder block;
FIGS. 2 to 3 are scanning electron micrographs of the porous diamond polycrystalline abrasive prepared in example 1.
Detailed Description
The method for producing a polycrystalline diamond abrasive according to the present invention will be further described with reference to examples.
Example 1
A method for producing a porous diamond polycrystalline abrasive, comprising the steps of:
1) preparing a sheet metal bonding agent: pressing cobalt powder (purity 99.96%) with particle diameter not more than 10 μm into metal wafer with diameter of 15mm and thickness of 1mm, and heating at 1600 deg.C and vacuum degree of 1 × 10-5Pa, sintering for 2 hours to obtain a sheet metal bonding agent for later use;
2) preparing a pre-sintering mixture: extruding diamond micropowder with the particle size of 2-4 microns into blocks, sequentially placing the blocks and the sheet-shaped metal binder prepared in the step 1) into a graphite heating pipe (the wall thickness is 0.8-1.2 mm) according to the sequence of the diamond micropowder blocks, the sheet-shaped metal binder and the diamond micropowder blocks to prepare a pre-sintered mixture with a 3-layer composite layer structure (shown in figure 1) of the diamond micropowder blocks-the sheet-shaped metal binder-the diamond micropowder blocks; wherein the weight parts of the diamond micropowder block and the sheet metal binder prepared in the step 1) are 75 parts and 25 parts respectively;
3) and (3) sintering: placing the graphite heating pipe containing the pre-sintering mixture in the step 2) in a high-pressure synthesis cavity (the cylinder diameter of the cubic press is 550-850 mm), sintering for 120s under the conditions of 7.5GPa and 1600 ℃, and infiltrating a metal sheet into a diamond material layer through high temperature and high pressure to prepare a polycrystalline diamond sintered block material;
4) crushing: crushing the polycrystalline diamond sintered lump material prepared in the step 3) into polycrystalline diamond particles with the particle size of less than 1mm for later use by adopting a hammer crusher, a jaw crusher, a roll crusher and a ball mill in sequence;
5) removing the metal binding agent: mixing the polycrystalline diamond particles prepared in the step 4) with a sulfuric acid aqueous solution with the mass percentage of 20%, reacting for 24 hours at the temperature of 150 ℃, filtering out acid liquor, repeatedly washing with clear water to be neutral, and drying to obtain the porous diamond polycrystalline abrasive; the weight ratio of the polycrystalline diamond particles to the strong acid aqueous solution is 1: 2.
And finally, screening the porous diamond polycrystalline abrasive into abrasives of each grade of granularity of 18/20-325/400 meshes according to the national standard for superhard abrasive-granularity inspection (GB/T-6406-.
FIGS. 2 to 3 are structural diagrams of the porous diamond polycrystalline abrasive obtained after removing metals by acid washing in example 1, and it can be seen that the abrasive has a porous structure.
Example 2
A method for producing a porous diamond polycrystalline abrasive, comprising the steps of:
1) preparing a sheet metal bonding agent: pressing nickel powder (purity 99.95%) with particle size not more than 10 μm into metal wafer with diameter of 20mm and thickness of 5mm, and heating at 1600 deg.C and vacuum degree of 1 × 10-5Pa, sintering for 3 hours to form a sheet metal bonding agent for later use;
2) preparing a pre-sintering mixture: extruding diamond micropowder with the particle size of 4-8 microns into blocks, sequentially placing the blocks and the sheet-shaped metal binder prepared in the step 1) into a graphite heating pipe (the wall thickness is 0.8-1.2 mm) according to the sequence of the diamond micropowder blocks, the sheet-shaped metal binder and the diamond micropowder blocks to prepare a pre-sintered mixture with a 3-layer composite layer structure (shown in figure 1) of the diamond micropowder blocks-the sheet-shaped metal binder-the diamond micropowder blocks; wherein the diamond micropowder block and the sheet metal binder prepared in the step 1) are respectively 80 parts and 16 parts by weight;
3) and (3) sintering: placing the graphite heating pipe containing the pre-sintering mixture in the step 2) in a high-pressure synthesis cavity (the cylinder body diameter of the cubic press is 550-850 mm), sintering for 150s under the conditions of the pressure of 7.8GPa and the temperature of 1750 ℃, and infiltrating metal sheets into a diamond material layer through high temperature and high pressure to prepare a polycrystalline diamond sintered block material;
4) crushing: crushing the polycrystalline diamond sintered lump material prepared in the step 3) into polycrystalline diamond particles with the particle size of less than 1mm for later use by adopting a hammer crusher, a jaw crusher, a roll crusher and a ball mill in sequence;
5) removing the metal binding agent: mixing the polycrystalline diamond particles prepared in the step 4) with 25 mass percent of nitric acid aqueous solution, reacting for 36 hours at the temperature of 200 ℃, filtering acid liquor, repeatedly washing with clear water to be neutral, and drying to obtain the porous diamond polycrystalline abrasive; the weight ratio of the polycrystalline diamond particles to the strong acid aqueous solution is 1: 2.
And finally, screening the porous diamond polycrystalline abrasive into abrasives of each grade of granularity of 18/20-325/400 meshes according to the national standard for superhard abrasive-granularity inspection (GB/T-6406-.
Example 3
A method for producing a porous diamond polycrystalline abrasive, comprising the steps of:
1) preparing a sheet metal bonding agent: pressing iron powder (purity 99.98%) with particle size not more than 10 μm into metal wafer with diameter of 30mm and thickness of 10mm, and heating at 1600 deg.C and vacuum degree of 1 × 10-5Pa, sintering for 4 hours to obtain a sheet metal bonding agent for later use;
2) preparing a pre-sintering mixture: extruding diamond micropowder with the particle size of 10-20 microns into blocks, sequentially placing the blocks and the sheet-shaped metal binder prepared in the step 1) into a graphite heating pipe (the wall thickness is 0.8-1.2 mm) according to the sequence of the diamond micropowder blocks, the sheet-shaped metal binder and the diamond micropowder blocks to prepare a pre-sintered mixture with a 3-layer composite layer structure (shown in figure 1) of the diamond micropowder blocks-the sheet-shaped metal binder-the diamond micropowder blocks; wherein the diamond micropowder block and the sheet metal binder prepared in the step 1) are respectively 90 parts and 10 parts by weight;
3) and (3) sintering: placing the graphite heating pipe containing the pre-sintering mixture in the step 2) in a high-pressure synthesis cavity (the cylinder diameter of the cubic press is 550-850 mm), sintering for 300s under the conditions of 8GPa and 1800 ℃, and infiltrating a metal sheet into a diamond material layer through high temperature and high pressure to prepare a polycrystalline diamond sintering block material;
4) crushing: crushing the polycrystalline diamond sintered lump material prepared in the step 3) into polycrystalline diamond particles with the particle size of less than 1mm for later use by adopting a hammer crusher, a jaw crusher, a roll crusher and a ball mill in sequence;
5) removing the metal binding agent: mixing the polycrystalline diamond particles prepared in the step 4) with 25% hydrochloric acid aqueous solution by mass, reacting for 48 hours at the temperature of 300 ℃, filtering out the acid solution, repeatedly washing with clear water to be neutral, and drying to obtain the porous diamond polycrystalline abrasive; the weight ratio of the polycrystalline diamond particles to the strong acid aqueous solution is 1: 2.
And finally, screening the porous diamond polycrystalline abrasive into abrasives of each grade of granularity of 18/20-325/400 meshes according to the national standard for superhard abrasive-granularity inspection (GB/T-6406-.
Performance testing
Adding ZnO-Li2O-Al2O3-SiO2The low-melting high-strength ceramic bond and the porous diamond polycrystalline abrasive (grain size 325/400) prepared in example 1 are mixed according to the proportion of 1:9, pressed, sintered and molded to prepare the abrasive tool, the sintering temperature is 600-700 ℃, and the abrasive tool is used for polishing and grinding the quartz surface.
Specifically, a quartz fine grinding experiment is carried out on a CNC8325 grinding machine, the linear speed of a grinding wheel is 120m/s and 150m/s, the grinding time is 1-2h each time, and no grinding liquid is added.
The result shows that the smoothness of the quartz surface can reach R15-35nm, the processing efficiency is higher, and the wear resistance is more than 2 times of that of the grinding tool made of single crystal diamond.
The foregoing examples are illustrative of embodiments of the present invention, and although the present invention has been illustrated and described with reference to specific examples, it should be appreciated that embodiments of the present invention are not limited by the examples, and that various changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (6)
1. A porous diamond polycrystalline abrasive, characterized by being produced by a method comprising:
1) preparing a sheet metal bonding agent: pressing metal powder with the grain diameter less than or equal to 10 mu m into a metal sheet at the temperature of 1500 ℃ and the vacuum degree of 1 multiplied by 10-5Sintering for 2-4h under Pa to obtain a sheet metal bonding agent for later use;
2) preparing a pre-sintering mixture: extruding the diamond micropowder with the grain diameter less than or equal to 30 mu m into blocks, and preparing the blocks and the sheet metal bonding agent prepared in the step 1) into a pre-sintered mixture with a 3-layer composite layer structure of diamond micropowder block-sheet metal bonding agent-diamond micropowder block; wherein the diamond micropowder block and the sheet metal binder prepared in the step 1) are 75-95 parts and 5-25 parts by weight respectively;
3) and (3) sintering: sintering the pre-sintered mixture in the step 2) for 120-300 seconds under the conditions that the pressure is 7-8GPa and the temperature is 1500-1900 ℃ to prepare the polycrystalline diamond sintered block material;
4) crushing: crushing the polycrystalline diamond sintered lump material prepared in the step 3) into polycrystalline diamond particles for later use;
5) removing the metal binding agent: mixing the polycrystalline diamond particles prepared in the step 4) with 20-30% by mass of strong acid aqueous solution, reacting for 24-48h at the temperature of 150-250 ℃, filtering out acid liquor, cleaning to be neutral, and drying to obtain the porous diamond polycrystalline abrasive;
the metal powder in the step 1) is cobalt powder, nickel powder or iron powder;
the grain size of the polycrystalline diamond grains obtained by crushing in the step 4) is less than 1 mm.
2. The porous diamond polycrystalline abrasive according to claim 1, wherein the purity of the metal powder in step 1) is more than 99.9%.
3. The porous diamond polycrystalline abrasive according to claim 1, wherein the metal sheet of step 1) has a thickness of 1 to 10 mm.
4. The porous diamond polycrystalline abrasive according to claim 1, wherein the strong acid of step 5) is sulfuric acid, nitric acid, or hydrochloric acid.
5. The porous diamond polycrystalline abrasive according to claim 1, wherein the weight ratio of the polycrystalline diamond particles to the strong acid aqueous solution in step 5) is 1 (2-4).
6. Use of a porous diamond polycrystalline abrasive according to any one of claims 1 to 5 for polishing a quartz surface.
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| CN113912056B (en) * | 2021-11-04 | 2023-03-14 | 郑州中南杰特超硬材料有限公司 | Method for synthesizing multiple NPDs in one time |
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| JP4225684B2 (en) * | 1997-09-05 | 2009-02-18 | エレメント シックス リミテッド | Method for producing diamond-silicon carbide-silicon composite material |
| GB0902230D0 (en) * | 2009-02-11 | 2009-03-25 | Element Six Production Pty Ltd | Polycrystalline super-hard element |
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