Rapid synthesis of Ti(C,N) powders by mechanical alloying and subsequent arc discharging  

放电辅助机械合金化快速合成Ti(C,N)粉体(英文)

作　　者：袁泉[1,2] 郑勇[1] 余海州[1,2] 

机构地区：[1]南京航空航天大学材料科学与技术学院,南京210016 [2]三峡大学机械与材料学院,宜昌443002

出　　处：《Transactions of Nonferrous Metals Society of China》2011年第7期1545-1549,共5页中国有色金属学报（英文版）

基　　金：Project(50674057) supported by the National Natural Science Foundation of China

摘　　要：Ti（C,N） powders were synthesized by mechanical alloying （MA） from a mixture of pure titanium and graphite under a nitrogen atmosphere in a planetary mill.Effects of arc discharging on phase transformation and microstructure of MA powders milled for 1-7 h were explored.The results show that Ti（C,N） powders were prepared after mechanical milling for 1 h and subsequent arc discharge treatment,whereas the synthesis reaction did not occur in 7 h by mechanical milling alone.The ions produced during arc discharging interacted with powder particles and accelerated the diffusion of atoms and the nucleation on the surface of the as-milled powder,which results in fast synthesis of Ti（C,N） powders.The formation mechanisms of the two synthesis processes are self-propagating reactive synthesis.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。

关 键 词：Ti（C N） powders mechanical alloying self-propagating reactive synthesis 

分 类 号：TG146.23[一般工业技术—材料科学与工程] TB383.3[金属学及工艺—金属材料]