Fine grain tungsten produced with nanoscale powder

Tao Lin, Fang Zhao, Liying Zhang, Chengyi Wu, and Zhimeng Guo Materials Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China

摘 要：<正>Nanoscale tungsten powder was prepared by reducing nanoscale tungsten trioxide in hydrogen to WO2.90 and further to W powder. After compacted with a rubber die, the nanoscale tungsten powder was sintered in a high-temperature dilatometer to investigate its shrinkage process. The results show that the compact of the nanoscale tungsten powder starts to shrink at 1050℃and ends at 1500℃. The shrinkage rate reaches the maximum value at 1210℃8. The relative density of sintered samples is 96.4%, and its grain size is about 5.8 μm.

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