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《The Chinese Journal of Nonferrous Metals》 2011-04
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Preparation of MoSi_2 powder used for plasma-spraying and its melting characteristics in plasma arc

YAN Jian-hui1,ZHANG Hou-an2,XU Hong-mei1,WU Hai-jiang1,TANG Si-wen1 (1.Advanced Materials Synthesis and Application Technology Institute, Hunan University of Science and Technology,Xiangtan 411201,China; 2.Department of Mechanical Engineering,Xiamen University of Technology,Xiamen 361024,China)  
The MoSi2 powder used for air plasma spraying was prepared by spray drying and vacuum sintering.By using MoSi2 powders as the raw powders,MoSi2 coating was prepared using air plasma spraying.The melting characteristics of MoSi2 powders in the plasma arc and the microstructures of the coating were studied by scanning electron microscopy(SEM) with energy dispersive spectroscopy(EDS) and X-ray diffraction(XRD).The results show that,when the powders are sintered at 1 200 ℃ for 1 h,the mobility and loose density of powders increase by 42.0% and 55.6%,respectively.Most MoSi2 particles occur during the sintering process,and the average particle sizes of the powders decrease after the MoSi2 powders pass through the high temperature plasma flame.MoSi2 particles are fully melted and the dense spherical particles are formed.During air plasma spraying,part of the tetragonal MoSi2(t) phase changes into MoSi2(h) crystal structure or oxidize to form Mo5Si3 phase.The microstructure of molybdenum-rich phase in the MoSi2 coating is similar to the "mesh" structure.
【Fund】: 国防基础研究资助项目(A3720060115);; 湖南省科技计划项目(2010GK3144)
【CateGory Index】: TF123.1
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