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US 12,097,589 B2Granted
Method for grinding single-crystal diamond
AssigneeHuaqiao University
InventorsJing Lu, Xipeng Xu, Yanhui Wang, Qiufa Luo, Zhongqiang Ma
Life of this patent
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Abstract
Carbon atoms of a single-crystal diamond and active abrasives are used to produce a chemical reaction to form carbides under a specific grinding condition of no higher than a graphitization temperature, and a hard abrasive is used to remove the carbides.
Claims15
A method for grinding a single-crystal diamond, comprising:
- (1) mixing a base material, an active abrasive, and a hard abrasive to obtain a first material, wherein the base material comprises at least one of ceramic, metal, or a metal-ceramic composite material, the active abrasive comprises a first abrasive configured to react with the single-crystal diamond to form at least one carbide, the hard abrasive comprises a second abrasive configured to remove the at least one carbide, a mass ratio of the active abrasive and the hard abrasive is 1-5:10, a mass ratio of the base material and a sum of the hard abrasive and the active abrasive is 1-2:2;
- (2) mixing the first material obtained in step (1) and at least one additive to obtain a second material, and sieving the second material;
- (3) adding a wetting agent into the second material obtained in step (2), molding under pressure to obtain a compact, and sintering the compact to obtain a grinding wheel;
- (4) fixing the grinding wheel and the single-crystal diamond to a grinding machine, and grinding a surface of the single-crystal diamond in combination with a grinding liquid using the grinding wheel, wherein a grinding process between the grinding wheel and the single-crystal diamond comprises:
- controlling a grinding temperature of surfaces of the active abrasive in the grinding wheel and the single-crystal diamond by controlling a revolution speed of the grinding wheel to enable the grinding temperature to be lower than a graphitization temperature of the single-crystal diamond to ensure that the single-crystal diamond is reacted to form the at least one carbide and to avoid graphitization, so that a hardness of the single-crystal diamond decreases;
- and
- grinding and removing the at least one carbide by the hard abrasive in the grinding wheel to finally obtain the single-crystal diamond.
4 more elements
A method for grinding a single-crystal diamond, comprising:
- a method for preparing a grinding wheel, and
- a grinding method, wherein the method for preparing the grinding wheel comprises:
- (1) mixing a base material, an active abrasive, and a hard abrasive to obtain a first material, wherein the base material comprises at least one of ceramic, metal, or a metal-ceramic composite material, the active abrasive comprises a first abrasive configured to react with the single-crystal diamond to form at least one carbide, the hard abrasive comprises a second abrasive configured to remove the at least one carbide, a mass ratio of the active abrasive and the hard abrasive is 1-5:10, a mass ratio of the base material and a sum of the hard abrasive and the active abrasive is 1-2:2, and the active abrasive is at least one of iron powder, tungsten powder, molybdenum powder, chromium powder, or titanium powder;
- (2) mixing the first material obtained in step (1) and at least one additive to obtain a second material, and sieving the second material;
- and
- (3) adding a wetting agent into the second material obtained in step (2), molding under pressure to obtain a compact, and sintering the compact to obtain a grinding wheel;
- wherein the grinding method comprises:
- (4) fixing the grinding wheel and the single-crystal diamond to a grinding machine, and grinding a surface of the single-crystal diamond in combination with a grinding liquid using the grinding wheel, wherein during a grinding process of the grinding wheel, a revolution speed of the grinding wheel is 1000-5000 rpm and a feed speed is 10-70 μm/min.
5 more elements
Dependencies are inferred from the claim text.