When gem-grade diamonds are synthesized by the high-temperature and high-pressure method,the internal radial temperature field has an important influence on the crystal size and crystal purity.On the basis of the conventional synthesis structure,dif-ferent radial temperature-conducting materials were used to regulate the radial tempera-ture field for the synthesis of high-temperature and high-pressure gem-grade diamonds,and the effects of different radial temperature-conducting materials on the grain size and crystal purity were investigated as radial temperature-regulating materials.The results showed that when high purity graphite flake was used as the radial temperature conduc-tive material,the equilibrium of the radial temperature field was broken,which was the promotion of regulation;when metal iron flake was used as the radial temperature con-ductive material,the equilibrium of the radial temperature field was broken as well,but it was the inhibition of regulation.When the thickness of the high-purity graphite sheet was 2.00 mm,the regulation and promotion of the radial temperature field was the most obvi-ous,and the synthesized crystal size difference value was within 0.50 ct,and the ratio of the crystal purity A material reached 71.31％.
关键词
高温高压法/宝石级金刚石/径向温度/导热材料/高纯石墨片
Key words
High-temperature and high-pressure method(HTHP)/Gem-grade diamond/Radial temperature/Thermal conductive material/High-purity graphite flake
维普
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