Kinetics of inverse graphitization of detonation sintered nano-diamond/alumina composites

摘要

Recently, detonation sintered nano-diamond/alumina composites have appeared and attracted much theoretical and experimental attention. Inspired by core hypothesis of diamond, molecular dynamics was used to analyze the probability of phase transformation between diamond and graphite. The results showed that the very short duration of heating and cooling was beneficial to the stability of nano-diamond in an environment of high temperature. The higher the pressure is, the more stable the diamond would be under high temperature. Therefore, under the condition of short time, high temperature and high pressure, the probability of diamond-graphite transition of detonation sintered nano-diamond/alumina composites was only equal to 11 parts per million. The probability of phase transformation from nano-diamond to graphite has been very low and the test experiences are in good agreement with the calculated results. Compared with other synthetic methods, the method of detonation sintered nano-diamond/alumina composites with high temperature, high pressure and short duration has the advantages of operation, environmentally benign and high yields.