Method for preparing polycrystal diamond particle allocated with wide particle size

Abstract

A preparation method for the polycrystalline diamond particle with wide grain distribution is characterized in that the high-energy detonator is taken as the loading mean and the negative oxygen-carbon atom contained by the additionally added carbon source and the detonator is taken as the composite carbon source; the weight ratio between high-energy detonator and the additionally added carbon source is 1:7 through 1:9.5. The diamond obtained by the method of the invention has the granularity distribution ranging from 1 nm to 10000 nm, product has high purity which reaches between 50 percent and 70 percent calculated by the additionally added composite carbon source, and the purity of the products is higher than 95 percent. The irregular multi-blade externality formed by the gathering of fine grains with nano-dimension in the product grains has unique cutting function when in use for the polishing material. The invention method is synthesized in the enclosed container, the production process is easily controlled, the output is easy to be recovered, the invention has small effect to the environment, furthermore, the process and equipment are simple and convenient for implementing the batch production, and the disposable investment and production cost are low.

Description

technical field [0001] The invention relates to a method for artificially synthesizing diamond, in particular to a method for preparing polycrystalline diamond particles (including nano-scale single crystals and micron-scale polycrystals) with wide particle size distribution. Background technique [0002] The methods of synthetic diamond mainly include static pressure method, dynamic high pressure method, vapor deposition method and chemical reaction method. The most mature and widely used method is the static pressure method, which uses the static high pressure generated by the hydraulic six-sided top press and the high temperature generated by the electric furnace to make the phase change of graphite into diamond under the action of a catalyst. Its main features are large equipment investment, complex raw materials, product particle size distribution in the range from a few microns to hundreds of microns, and the particles are irregular single crystals with sharp edges and...

AI Technical Summary

Problems solved by technology

The molding and loading of raw materials in this technology is relatively complicated, not only forming explosive powder columns, but also forming graphite and metal flying plates; this technology usually adopts open explosive production in outdoor pools, which causes serious vibration and noise pollution to the environment, and the product recovery is also difficult. Difficult; the product particles obtained by this technology are mainly concentrated in the order of one micron, and the product particles have a relatively regular shape and a relatively flat surface

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