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《Journal of Huaqiao University(Natural Science)》 2010-06
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Influence of Heat Treatment Conditions on the Microstructure of Nano-Tungsten Powder

SONG Zhi-hua1,GUO Heng-qun1,WU Chong-hu2,WU Qi-shan2(1.College of Information Science and Engineering,Huaqiao University,Quanzhou 362021,China;2.Xiamen Golden Egret Special Alloy Co.Ltd.,Xiamen 361006,China)  
Nano-W powder was prepared from voilet tungsten oxides by hydrogen reduction,and through heat treatment on the samples.Then,we have characterized the sample morphology,phase,content,specific surface area and pore structure,analyzed the lattice change and the growth mechanism of the grain.The results indicate that the nano-W powder is more compact after heated treatment,the shape is more regular and the lattice is changed into expansion from contraction;its specific surface area and pore size decreases,and particle size increases and more uniform particle size distribution.With the temperature increases,the lattice expansion intends to stability.The grain growth is very rapidly when the temperature reaches 1 200 ℃,and its growth mechanism is explained according to the grain boundary migration.
【Fund】: 国家科技支撑计划项目(2007BAE05B01)
【CateGory Index】: TB383.1
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