Mechanically activated reactive synthesis of refractory molybdenum and tungsten silicides

作者：Feng, Peizhong^*; Farid, Akhtar; Wang, Xiaohong; Humail, Islam S; Qu, Xuanhui

来源：International Journal of Refractory Metals and Hard Materials, 2008, 26(3): 173-178.

DOI：10.1016/j.ijrmhm.2007.05.008

• mechanical alloying
• reactive synthesis
• refractory materials
• silicides

In this study, processing of elemental powders mixtures was carried out by mechanical alloying (MA) and heat treatment in vacuum at 700-1000 degrees C for 1 h. The phase transformation of the powders was investigated by X-ray diffractometer (XRD). The results showed that mechanical alloying promoted the formation of a solid solution of elemental powders. The energy stored in the powders was increased as a result of exterior energy and the barrier energy of the formation of the compound could be exceeded easily. Intermetallics Of MoSi2, WSi2, Mo5Si3, Mo3Si and SiC/MoSi2 composite powders were synthesized by mechanically activated reactive synthesis (MARS). The mechanically induced self-sustaining reaction was observed in MoSi2 and MoSi2 + 10 wt%SiC stoichiometry system. It has concluded that mechanically activated reactive synthesis is an effective method for the preparation of high melting-point refractory compounds.

• 出版日期2008
• 单位中国矿业大学（北京）; 北京科技大学