Diamond super micro powder and preparation method thereof

Abstract

The invention relates to a diamond super micro powder and a preparation method thereof. Diamond micro powder which is in single crystal and synthesized by static pressure method is taken as raw material, detonation impacting and separation purification are carried out, thus obtaining the super micro powder with irregular crystal form appearance topography, micro visible crystal interior crack andstructure defect and particle size peak value of 10-1000nm, and particle surface and crystal crack interface of the super micro powder are associated with non diamond carbon accounting for 1-30% of total mass of the powder. The diamond micro powder provided by the invention has stable properties and good grinding force, better surface evenness can be obtained when being applied to precision surface planarization processing, thus achieving the aim of being equivalent to the effect of expensive products of multi-crystal diamond micro powder and nano diamond micro powder which are generally usedat present; the method of the invention can process massive diamond micro powder only using a small amount of explosive, incident cost is low while product performance is greatly improved, thus having obvious cost advantage.

Description

technical field [0001] The invention relates to the field of abrasive materials, in particular to a diamond ultrafine powder and a preparation method thereof. Background technique [0002] With the rapid development of the electronic information industry, the requirements for ultra-flat surface processing are getting higher and higher. Micron or even submicron diamond abrasives have been widely used in this field and become an indispensable material for the manufacture of computer hard disks, silicon wafers, and surface planarization of integrated circuits. The diamond abrasives currently used in this field are mainly micron and submicron abrasive products obtained by crushing, shaping, purifying and grading diamonds synthesized by static pressure method. This product forms an irregular polyhedron with sharp edges and corners during processing, and has a high material removal force in practical applications. Deeper scratches that form require grinding with a finer abrasive...

AI Technical Summary

Problems solved by technology

Polycrystalline diamond products and detonation nano-diamond products are aggregates composed of ultra-fine diamond particles of 3 to 15 nanometers. During the grinding process, the particles are peeled off under external pressure without sharp edges and corners, thus effectively It avoids surface scratches and improves the surface smoothness of processing, but the material removal rate of this type of product is low, the processing efficiency is not high, and there is a high price of product raw materials (many graphite-converted graphite obtained by explosive impact method) The detonation method nano-diamond products prepared by detonation synthesis reaction of crystalline diamond products or negative oxygen balance explosives, due to the low yield and large consumption of explosives, have led to high costs. In recent years, the market price has been static pressure diamond powder products. dozens of times), there are still many technical problems to be solved in terms of product purification and dispersion

[0003] Chinese patent document CN1186401C describes a method for treating the surface of nano-diamond particles, so that different organic molecules are combined on the surface of nano-diamond particles, thereby changing the hydrophilicity and lipophilicity of nano-diamond particles, and improving their water and oil phases. Suspension performance; Xu Xiangyang et al. described the modification treatment method of nano-diamond in water medium and white oil medium (China Powder Technology, Vol. No. 4, pp. 61-64), but the technical content recorded in these two documents cannot solve the problem of grinding force and surface smoothness requirements of diamond particles.

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