多晶金刚石微粉的制备及其得率和耐磨性

Preparation of Polycrystalline Diamond Powders and Its Yield and Wear Resistance

以土状石墨粉和铜粉为原料,采用粉末冶金法制备了铜/石墨材料,然后采用冲击波合成工艺制备了多晶金刚石微粉;研究了铜含量、石墨粒径、热处理以及复压工艺对其得率和耐磨性的影响。结果表明:多晶金刚石微粉的得率随铜含量的增加而增大,随石墨粒径的增大而先增后降,粒径为70μm时的得率最高;复压前,多晶金刚石微粉的得率随热处理温度的升高先略增加后又急剧降低,复压后,得率随热处理温度的升高而增大;制备工艺对多晶金刚石微粉耐磨性能的影响较小。

Taking earthy graphite powders and copper powders as raw material, the graphite-copper material was prepared by powder metallurgy method, and then the polycrystalline diamond powders were prepared by means of shock wave synthesis process. The effect of copper content, graphite powders size, heat treatment and repressing process on yield and wear resistance of the polycrystalline diamond powders was studied. The results show that the yield of the diamond increased with the increase of copper content, first rose then fell with the increase of the graphite size, and the yield was highest when the particle size was 70 μm. The yield slightly increased then sharply decreased with the increase of the heat treatment temperature before repressing, and the yield increased with the increase of heat treatment temperature after repressing. The preparation process had fairly small effect on wear resistance of polycrystalline diamond powders.