石墨类型对多晶金刚石微粉性能的影响

摘要

以不同类型的石墨粉为原料,通过铜吸收和传递热量,采用冲击波合成工艺,制备多晶金刚石微粉.测试了多晶金刚石微粉的得率和耐磨性能,研究了石墨微晶结构对其得率和耐磨性能的影响.实验结果表明:鳞片石墨合成多晶金刚石微粉的得率和耐磨性不如土状石墨合成的金刚石；微晶具有平行排列的焦炭基人造石墨合成的多晶金刚石微粉易石墨化,难得到金刚石；微晶具有杂乱排列的炭黑基人造石墨的得率比土状石墨高；一次焙烧的炭黑基人造石墨具有较多的微孔,其合成的金刚石的耐磨性能比土状石墨的差；经过二次焙烧后合成的多晶金刚石微粉的耐磨性能比土状石墨的好.%With copper to absorb and transfer the heat during the synthesis, polycrystalline diamond powders were prepared by means of shock compression with different kinds of graphite as starting materials. In order to study the effect of graphite's microcrystal structure on the diamond's performance, the yield rate and the wear resistance of the polycrystalline diamond powder were tested. The results showed that the yield rate and the wear resistance of diamond prepared from natural flake graphite were inferior to those of the diamond from earthy graphite. The diamond prepared from coke-based artificial graphite with parallel arranged microcrystalline lattice was easy to turn graphitized. The yield rate of diamond, which was prepared from carbon black-based artificial graphite with disarray arranged microcrystalline lattice, was higher than that of the diamond from earthy graphite. The carbon black-based one-baking artificial graphite had many micropores, and the wear resistance of diamond prepared from it was lower than that of the diamond from earthy graphite. The wear resistance of polycrystalline diamond powders prepared from two-baking artificial graphite was higher than that of the diamond from earthy graphite.