【摘要】 使用机械合金化方法在卧式行星式球磨机上制备了TiC。利用X射线衍射、扫描电子显微镜对粉末的微观结构和形貌的变化进行了分析。讨论了在机械合金化制备TiC过程中磨球直径对于球磨效率、球磨能量的传递以及Ti+C→TiC发生机理的影响,对于TiC的不同形成机理作出了解释。结果表明:在机械合金化制备TiC的过程中,磨球直径对于反应发生的速率和反应机理有着明显的影响,即当磨球直径较小时,Ti+C→TiC反应是以机械诱发扩散反应(MRD)的形式逐步进行的;当磨球直径较大时,反应是以自蔓燃反应(SHS)的形式快速进行的。更多还原

【Abstract】 TiC has been synthesized by mechanical alloying employing horizontal planetary ball mill,XRD and SEM technique were used to characterize changes in morphology and microstructure of compound powders.The influence of diameter of milling ball on the milling efficiency,milling energy transfer as well as the reaction mode Ti+C→TiC in the MA process was discussed.The results indicate that the diameter influenced both reaction mode and speed,namely as the ball diameter is small,Ti + C → TiC reaction develops gradually through mechanically induced diffusion-controlled reaction(MRD);as the ball diameter is large,the reaction progresses rapid in SHS mode.更多还原