A split core column for diamond synthesis and its preparation method

Abstract

The invention discloses a splitting core column for synthesizing diamond and a preparation method thereof. The splitting core column for synthesizing the diamond comprises a core column tube, wherein a core column is arranged in the core column tube, a first core column piece is arranged on the upper end of the core column tube, and a second core column piece is arranged on the lower end of the core column tube. According to the splitting core column for synthesizing the diamond, different mixing ratios of peripheral materials to internal materials are adopted, and the weight ratio of catalysts of the peripheral materials is controlled to be higher than that of the core column by 4% to 8%, so as to effectively control the granularity of the peripheral materials, thereby reducing the growth rate of the peripheral materials, so that the whole core column for synthesis grows at uniform speed in the process that graphite is converted into the diamond, and the granularity of the synthesized diamond is uniform; the isostatic pressing granulation granularity range of the core column pieces and the core column tube and the isostatic pressing granulation granularity range of the core column are controlled, so that materials are uniformly fed into a die cavity during pressing, and the density of pressed products of the core column pieces, the core column tube and the core column is uniform, thereby guaranteeing the quality and the yield of the synthesized diamond.

Description

Technical field [0001] The invention relates to the technical field of diamond synthesis, in particular to a split core column for diamond synthesis and a preparation method thereof. Background technique [0002] In the synthesis of synthetic diamond, the graphite in the top press is converted into diamond by a six-side top press under a constant ultra-high temperature and high pressure. Therefore, the core column of the synthesized diamond is the place where the diamond grows. When synthesizing, six blocks are synthesized. The directionally balanced force makes the inside of the synthesis cavity obtain a stable pressure field distribution, but from the outside to the inside, there is an obvious pressure gradient field, which directly affects the quality of the synthetic material, and there are problems such as low diamond output and low heat utilization efficiency. This is because the current synthetic diamond core column is an integrated column with a single formula. The pressu...

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Problems solved by technology

[0002] In the synthesis of synthetic diamond, the graphite in the top press is converted into diamond mainly through the six-sided top press under constant ultra-high temperature and high pressure. Therefore, the core column of the synthetic diamond is the place for growing diamonds, and six blocks are synthesized during the synthesis. The force is balanced in the direction, so that the inside of the synthesis cavity can obtain a stable pressure field distribution, but from the outside to the inside, there is an obvious pressure gradient field, which directly affects the quality of the synthesis material, and there are problems such as low diamond output and low heat utilization efficiency. This is because the core column of synthetic diamond is an integrated column with a single formula. The pressure and temperature of the synthetic core column gradually decrease from the outside to the inside, and the peripheral pressure and temperature are relatively high, so the grown diamond has a coarse particle size and poor particle size concentration. low intensity

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