炸药爆轰合成超微金刚石的数值模拟

在相变模型基础上对炸药爆轰过程中超微金刚石的合成进行数值模拟，用简单反应速率函数估算炸药爆轰反应区的热力学参数，用动力学有限元程序DYNA2D模拟爆轰产物的膨胀过程，按均匀成核和长大两步模拟爆轰过程中游离碳相变成金刚石的过程，同时考虑金刚石在爆轰产物膨胀过程中的石墨化。计算了不同装药条件和保护条件下金刚石的成核率，长大线速度，石墨化率，金刚石得率及粒径分布等信息，对计算结果进行分析和讨论。

Numerical Simulation of the Synthesis of Ultrafine Diamond by Explosive Detonation

Based on a proposed phase transition model of free carbon, the synthesis of ultrafine diamond (UFD) during explosive detonation is numerically simulated. Thermodynamic parameters in the detonation reaction zone are estimated according to simple assumptions. KHT equation of state is used to calculate the detonation parameters of explosives and the equation of state of detonation products. The process of expansion of the detonation products under different conditions of preservation is simulated through the use of DYNA2D code. The phase transition from liquid carbon to diamond includes crystal nucleation and crystal growth. The influence of diamond graphitization is also evaluated. The nucleation rate, linear growth velocity, graphitization rate, yield and particle-size distribution of diamond under different charge conditions and preservation conditions are calculated. Some useful conclusions are made on the basis of the calculated results.