添加剂Li_8SiN_4对cBN晶体形貌的影响

EFFECTS OF ADDITIVE Li 8SiN 4 ON cBN CRYSTAL MORPHOLOGY

在４．５～５．０ＧＰａ，１５００～１８００℃范围内，在Ｌｉ基复合氮硼化物的催化体系中添加Ｌｉ８ＳｉＮ４后，得到了具有光泽的棕色透明的ｃＢＮ单晶。研究了ｃＢＮ晶体的形貌，结果表明，添加Ｌｉ８ＳｉＮ４后得到的等积形ｃＢＮ晶体的百分比明显增多，除部分截角四面体外，多为截角八面体晶体，且棱角尖锐。

After adding Li 8SiN 4 into the catalytic system of Li complex borom nitrides,the glossy transparent cBN brown crystals were synthesized under the conditions of high pressure and high temperature in the range 4.5～5.0GPa and 1500～1800℃ respectively.The morphology of cBN crystals is studied.The result shows that the percentage of blocky cBN crystals synthesized with Li 8SiN 4 increase obviously,and except the partial tuncated tetragonal erystals,the most of them are tuncated octahedral crystals.The edges and corners of cBN crystals are accurate and sharp,and surfarces of them are dense and smooth.