Superhard abrasive particle coated with active metal and silicon and method for producing superhard abrasive particle

Abstract

A surface-coated active metal-coated silicon-coated superhard abrasive grain, which is coated with active metal on the surface of diamond or cubic boron nitride with a particle size of not less than 0.1 microns, and then coated with a layer of cubic boron nitride on the surface of the coated active metal layer. phase crystalline silicon; the manufacturing method is to put the above-mentioned superhard abrasive grains and active metal powder into a stainless steel container and put them into a vacuum reaction furnace cavity, heat up and vacuumize, and spread the above-mentioned superhard abrasive grains coated with active metal on the stainless steel Put the container into the vacuum reaction chamber of the silicon plating equipment, turn on the vacuum pump and heating valve, introduce the silane precursor gas, saturate and adsorb it at 200~1500Pa for 5~25 minutes, and extract the remaining gas and reaction product gas. The coating equipment of the present invention is simple and reliable, easy to operate, and low in cost. The anti-oxidation ability and thermal stability of the superhard abrasive grains are greatly improved, which can effectively prevent the shedding of the abrasive, increase the holding force of the matrix to the abrasive, and prolong the service life of the abrasive tool. longer.

Description

technical field [0001] The invention relates to a superhard material and a preparation method, in particular to a superhard abrasive grain and a preparation method. Background technique [0002] Superhard materials diamond and cubic boron nitride are widely used in many sectors of the national economy due to their high hardness, high wear resistance, high thermal conductivity and other comprehensive properties. Most of the superhard abrasives are used for cutting, grinding, Polishing and dressing tools are used, but due to the fine particles of industrial diamond and cubic boron nitride, most of the tools need to rely on metal, ceramics or resin as the matrix, and bond their fine particles together to become various superhard tools , to realize the processing of the workpiece. Therefore, the service life and efficiency of superhard tools are not only related to the selected superhard abrasive grains and bonding agent, but also depend on the bonding strength of superhard abr...

AI Technical Summary

Problems solved by technology

[0003] In the abrasives industry, there is a common problem: there is a high interfacial energy between the covalently bonded superabrasive grains and metal and vitrified bonds, which makes the bonding ability of abrasive grains and general metals comparable. Difference

However, because the titanium layer is very thin and easily oxidized, it is easy to be completely oxidized to expose the surface of superhard abrasive grains during sintering, and the effect is not very ideal.