高纯度MoSi_2粉末的合成与分析  

Synthesis and analysis of high-purity MoSi_2 powder

作　　者：冯鹏发[1,2] 刘仁智[1] 赵虎[1] 杨秦莉[1] 付静波[1] 孙军[2] 

机构地区：[1]金堆城钼业股份有限公司,西安710077 [2]西安交通大学金属材料强度国家重点实验室,西安710049

出　　处：《粉末冶金技术》2011年第2期130-136,共7页Powder Metallurgy Technology

基　　金：国家高技术发展计划资助项目(2008AA031002)

摘　　要：采用机械合金化法、高能机械化学法、化学法+高能球磨法3种方法试验合成MoSi2粉末,并对其成分和物相进行了分析。结果表明,化学法+高能球磨法可高效地合成出高纯度MoSi2粉末,其工艺为:按照Mo、Si、C的原子比为1:3:7配制MoO3粉末、SiC粉末和碳粉混合粉末;1 200℃下,在刚玉管炉中,用50%Ar-50%H2混合气体对其还原12h,获得MoSi2-SiO2混合粉末;用氢氟酸溶液除去SiO2粉末,获得纯MoSi2粉末,然后高能球磨4h以改变其颗粒形貌和粒度组成。By mechanical alloying,high-energy mechanochemistry,chemical synthesis ＋ high-energy ball milling,MoSi2 powder was synthesized.Its chemical composition and phases were analyzed.The results show that by chemical synthesis ＋ high energy ball milling,high-purity MoSi2 powder can be efficiently synthesized.The mixed powder of MoO3,SiC and carbon with x（Mo）∶x（Si）∶x（C）=1∶3∶7（atomic ratio） is reduced at 1 200℃ for 12h in the corundum tube furnace,using mixed gas of 50%Ar-50%H2 as reductant.The reaction product is MoSi2-SiO2 powder mixture,which is immersed in hydrofluoric acid solution to remove SiO2 powder.Then pure MoSi2 powder is milled for 4h by high-energy ball to change its morphology and particle size distribution.

关 键 词：高纯MoSi2粉末 化学合成 分析 高能球磨 

分 类 号：TQ639.2[化学工程—精细化工]