Fabrication of MoSi2 Nanocrystal by Mechanical Alloying Large Particle-sized Starting Powders
The MoSi2 nanocrystal was prepared by mechanical alloying (MA) large particle-sized starting powders,in which the milling time is much longer than usual MA time.It was found that the Mo-Si powder mixture mixed at stoichiometry proportion forms α-MoSi2 and β-MoSi2 in the MDR mode rather than pure α-MoSi2 in the SHS mode.The grain size of MoSi2,calculated using Scherrers formula,is 18nm when milled for 96h,and decreases to 12nm when further milling to 144 h.This is because that the milling balls provide enough energy to refine most of the rough crystal grain.The average grain size increased to 15nm when milled for 192 h,which indicates that further expand time could not refine the crystal grain while cause the growth of a part of the crystal grain.The particle size of MoSi2 is about 0.5μm when milled for 96 h and the agglomerating phenomenon is severe.The particle size of MoSi2 decreases to 0.4μm and releases the agglomerating phenomenon with the milling time for 144 h.
MoSi2 Nanocrystal mechanical alloying
Luo Junting
College of Mechanical Engineering, State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China
国际会议
The Sixth China International Conference on High-Performance Ceramics(第六届中国先进陶瓷国际研讨会(CICC-6))
哈尔滨
英文
768-770
2009-08-16（万方平台首次上网日期，不代表论文的发表时间）