Crystallization behavior of self-propagating high temperature synthesis WC powder
GAO Yuyang1, LIU Yong1, CHEN Gang2, TANG Xiaotian2, ZHOU Chengshang1
1. Powder Metallurgy Research Institute, Central South University, Changsha 410083, China; 2. School of Materials Science and Engineering, Hunan University, Changsha 410082, China
Abstract：Single crystal WC powder was prepared by self-propagating high temperature synthesis (SHS) with wolframite (Fe(Mn)WO4), tungsten (WO3), calcium carbide (CaC2) and high purity aluminum powders as main raw materials. The effects of thermite addition (Fe3O4-Al mixture, n(Fe3O4):n(Al)=3:8), preheating of raw material and feeding amount on particle size and morphology characteristics of the WC powder were studied. The results show that the crystal shape of the WC powder prepared by SHS method is complete. Although the temperature of combustion system is increased with adding thermite, a large number of Fe3W3C phases are formed, resulting in a decrease in the purity of WC powder. Preheating the raw powders in the crucible can make the WC grain grow fully. The size of the WC powder becomes larger, and the WC crystal shape changes from spherical to multilateral shape. The particle size of the WC powder increases with the increase of the feeding amount of reaction material, and the shape of WC powder changes from spherical to polygonal.
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2022, Vol. 27 
