Preparation method of carbon source for synthesis of white diamond

Abstract

The invention discloses a preparation method of a carbon source for synthesis of white diamond. The preparation method comprises steps as follows: A, a graphite workblank prepared from superfine coke particles serving as a raw material is put in a gasified graphitization furnace; B, the furnace is powered on and performs heating; C, nitrogen with the purity being 99.99% is introduced, and chlorine gas is introduced after 18-22 minutes; D, nitrogen with the purity being 99.99% is introduced again after 18-22 minutes, and Freon is introduced after 18-22 minutes; E, circulation is performed 5-7 times sequentially; F, nitrogen is introduced continuously, power outage is performed, and the mixture is naturally cooled to 400 DEG C or below; G, the graphite workblank discharged out of the furnace is sampled, and the impurity content, the volume density, the apparent porosity and the compressive strength of the sample are detected; H, the graphite workblank meeting high purity, high strength and high density requirements is detected, and the carbon source for synthesis of the white diamond is obtained. The method is easy to implement and simple and convenient to operate, the prepared carbon source adopts excellent materials, has high compressive strength, adopts a compact microscopic structure and has tiny air pores, and the voltage stabilization effect is good in the synthesis process of large-particle diamond.

Description

technical field [0001] The invention relates to the technical field of superhard materials, in particular to a method for preparing a carbon source for synthesizing white diamonds, which is suitable for synthesizing the carbon source of white diamonds on a six-sided top press by a static pressure catalyst method. Background technique [0002] China is a big producer of synthetic diamonds, and the speed of development is extremely fast. Synthetic diamonds use graphite as a carbon source. This is because carbon, graphite, and diamond are all isomers of carbon. [0003] The synthesis of traditional large-grain diamonds is generally processed by ordinary artificial graphite blanks. The impurity content of this type of graphite is relatively high, about 400-900ppm; the particle structure is relatively coarse, and the average particle size is between 40-55μm, so Its microstructure is not dense enough, the pores are large, and the compression resistance is low. During the process...

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Problems solved by technology

[0003] The synthesis of traditional large-grain diamonds is generally processed by ordinary artificial graphite blanks. The impurity content of this type of graphite is relatively high, about 400-900ppm; the particle structure is relatively coarse, and the average particle size is between 40-55μm, so Its microstructure is not dense enough, the pores are large, and the compression resistance is low. During the process of synthesizing large-grain diamonds, the pressure loss in the cavity is large, and the effect is not good.