Cryogenic treatment method of diamond

Abstract

The invention discloses a cryogenic treatment method of diamond, which includes the steps of: placing 30 / 35-mesh and 35 / 40-mesh diamond in a liquid nitrogen cryogenic box to perform cryogenic treatment, wherein the temperature in the cryogenic box is stepwise reduced from room temperature, 20 DEG C, to -180 DEG C, and then is slowly increased to room temperature; then the temperature is maintainedfor a certain time and then is increased to 120 DEG C and maintained for a certain time; finally the temperature is slowly reduced to room temperature. The method can significantly increase the entire static pressure strength of two batches, 30 / 35 meshes and 35 / 40 meshes, of diamonds, wherein the number of diamond granules, of which the static pressure strength ranges from 600-800 MPa after the cryogenic treatment, is increased by about 20%. The cryogenic treatment can permanently change the crystal structure of interior of the material, solve crystal dislocation and release a part of residual stress, thereby affecting the performance of the material.

Description

technical field [0001] The invention relates to a diamond cryogenic treatment method, in particular to a method for improving performance of a diamond material through liquid nitrogen cryogenic treatment, and belongs to the field of material science. Background technique [0002] The so-called cryogenic treatment is to place the processed object (material) in a specific ultra-low temperature environment to change the microstructure and structure of the processed object (material), so as to improve the performance of the material to a certain extent. The lowest processing temperature can reach -196°C. At the beginning of the 20th century, the initial application of cryogenic technology in the aviation field was mainly in the application of liquid oxygen chemical rocket oxidizer and the use of refrigeration devices in spacecraft, as well as liquid oxygen fuel and nuclear powered rocket propellants. Later, some researchers began to try to apply cryogenic technology to the proc...

AI Technical Summary

Problems solved by technology

Due to the impurities inside the diamond, as well as the crystal defects and lattice dislocations formed during the crystal growth process, the performance of the diamond will be reduced to varying degrees.

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