Powder catalyst for synthesizing ultrafine granular diamond

Abstract

The invention discloses a powder catalyst for synthesizing ultrafine granular diamond. The powder catalyst is mainly prepared from the following alloying components by weight percent: 20% to 25% of Fe, 3% to 5% of Co, 0.5% to 2% of Ce, 3% to 5% of Mn, 0.5% to 1% of SiC, 0.5% to 1% of Mo and the balance being Ni. By utilizing the technical scheme of the powder catalyst, the high-purity ultrafine-particle spherical or approximately spherical powder catalyst can be prepared, and the granularity of the obtained powder catalyst is 600 to 1000 meshes. When the powder catalyst is applied to synthesis of ultrafine diamond single crystal, single-crystal diamonds within 400 meshes can be produced.

Description

technical field [0001] The invention relates to a powder catalyst material for superhard material diamond synthesis, in particular to a powder catalyst for synthesizing ultrafine particle diamond and a preparation method thereof. Background technique [0002] Powder catalyst is an essential raw material for diamond synthesis, which can effectively reduce the synthesis conditions of diamond, and reduce the conversion of graphite to diamond from the high temperature conditions of 10-12Gpa and 2600°C to 5.0-5.5Gpa, 1200°C-1300°C; The powder catalysts with different properties also have a great influence on the properties and uses of diamond in diamond synthesis. As today's ultra-hard fine abrasive, ultra-fine diamond single crystal is widely used in fields and departments such as machinery, electronics, aerospace, optical instruments, petroleum, military industry, etc., especially in magnetic heads and optical communication devices , laser transmitters, special optical glass, ...

AI Technical Summary

Problems solved by technology

However, it is difficult to synthesize ultra-fine diamonds of 400 mesh or finer from the ultra-fine diamond synthesized by the widely used flake catalyst and ordinary powder catalyst at present, and the synthesized diamond particles are mostly coarser than 200 mesh, and there are defects such as low conversion rate.

[0003] Patent No. 01144858.X discloses a "powder catalyst for synthesizing fine-grained diamond". The disclosed powder catalyst consists of alloy composition Mn 24-26% , Co 4.5-5.5%, adding trace elements C, Al, N and the rest is Ni, the catalyst is a powder catalyst with a particle size of -100 / +500 mesh, although the catalyst can synthesize fine-grained diamond, its nucleation amount is low , and the particle size of synthetic diamonds is mostly coarser than 200 mesh, and it is still difficult to synthesize ultrafine diamonds with finer than 400 mesh

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