论文部分内容阅读
利用机械合金化方法以Ti粉、石墨粉为原料,采用行星式球磨机在高纯氮气气氛下制备出Ti(C,N)粉体。研究放电处理对机械合金化1～7h试样的相变及显微组织的影响。实验结果表明:球磨1h后的样品在放电辅助下合成了Ti(C,N)粉体;而仅采用机械合金化方法,球磨7h不能合成Ti(C,N)粉体。放电处理产生的等离子体作用于粉体上,提高了原子间的扩散速度和Ti(C,N)在球磨粉体表面的形核速度,这是加速Ti(C,N)合成的主要原因。两种合成方法都遵循机械诱发自蔓延反应机制。
Ti (C, N) powder was prepared by mechanical alloying method using Ti powder and graphite powder as raw materials in a planetary ball mill under high purity nitrogen atmosphere. The effects of discharge treatment on the phase transformation and microstructure of mechanical alloying 1 ~ 7h specimens were investigated. The experimental results show that Ti (C, N) powder is synthesized with the aid of the discharge after milling for 1h. However, Ti (C, N) powder can not be synthesized by ball milling for 7h only by mechanical alloying. The plasma generated by the discharge treatment acts on the powder to increase the diffusion speed of the atoms and the nucleation rate of Ti (C, N) on the surface of the ball milled powder, which is the main reason for accelerating the synthesis of Ti (C, N). Both synthetic methods follow a mechanistically induced self-propagating reaction mechanism.