Synthesis process of self-sharpening resin diamond

Abstract

The invention discloses a synthesis process of self-sharpening resin diamond. The synthesis process comprises the following main steps of: sufficiently mixing 200-350-mesh graphite powder with nickel-based alloy catalyst powder in the weight ratio of 7:(3-6), placing a mixture into a three-dimensional mixer for mixing for 10-12 hours, grinding into 50-mesh fine powder after isostatic pressing, carrying out vacuum deaeration at 800-900 DEG C in a vacuum furnace for 60-70 minutes, naturally cooling to the room temperature to obtain a mixed material, filling the mixed material into a mould, and pressing into a columnar synthetic rod by utilizing a four-column pressing machine, wherein the dimension of the synthetic rod is phi 34*33mm, and the density of the synthetic rod is 2.1-2.7g / cm<3>; assembling the synthetic rod, pyrophyllite, a conductive steel ring, a conductive tube, a conductive plate, a thermal insulation tube, a thermal insulation plate and the like to form a diamond synthetic block, and then placing the diamond synthetic block into a six-surface diamond presser for synthesis, with the actual synthesis pressure being 9.5-11GPa, and the actual synthesis temperature being 1,450-1,550 DEG C, wherein the actual synthesis temperature and the synthesis pressure are ensured respectively by controlling a power curve and a pressure curve. The synthesis process is used for a synthesis technology of the self-sharpening resin diamond.

Description

technical field [0001] The invention relates to the technical field of diamond synthesis, in particular to a self-sharpening resin diamond synthesis technology. Background technique [0002] At present, low-strength diamond abrasives, mainly single crystal diamond particles, are used in the manufacture of resin bonded abrasives and vitrified bonded abrasives at home and abroad, and the use effect is not ideal. There are mainly the following problems: (1) the surface is smooth, not rough enough, and the mechanical combination (engagement) with the binder is not strong. (2) During the grinding process, the entire abrasive grain often falls off prematurely. According to statistics, 2 / 3 of the diamond abrasive grains in the resin bonded diamond grinding wheel fall off prematurely before the grinding effect is fully exerted, which greatly shortens the service life. (3) During the grinding process, the damage mode of the abrasive grains is to split along the direction of the cle...

AI Technical Summary

Problems solved by technology

[0002] At present, low-strength diamond abrasives, mainly single crystal diamond particles, are used in the manufacture of resin bonded abrasives and vitrified bonded abrasives at home and abroad, and the use effect is not ideal.

There are mainly the following problems: (1) The surface is smooth, not rough enough, and the mechanical combination (engagement) with the binder is not strong

(2) During the grinding process, the entire abrasive grain often falls off prematurely

(4) There are few cutting edges of single crystal abrasive grains, the area of ​​cutting edges is large, and the required grinding force is large, which affects the sharpness of grinding

However, this approach is only a measure taken from the outside of the particle, and does not solve the problem from the essence of the particle

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