Preparation of WC-Co Thermal Spraying Powder by Spray Granulation-H2 Reduction Process
ZHU Er-tao1,2, YANG Jian-gao1,2,3,TAN Xing-long2, DENG Jun-wang2, DAI Yu2, GUO Sheng-da1,3
1. School of Materials and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China 2. Advanced Corporation for Materials & Equipment, Changsha 410118, Hunan, China 3. Project Research Institute, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China
Abstract：Thermal spray feeder powder of WC-Co was prepared by H2 reduction of the perform by spray drying granulating of ball milled mixture started from water soluble cobalt acetate, WC powder, pure water, solid carbon powder and liquid organic carbon. It was shown that during spraying drying granulating process, particle size range is from 10 μm to 80 μm, with mean particle size around 35 μm, when inlet air temperature is 260 ℃,outlet temperature is 140 ℃ and when revolving speed of the spray drying nozzle is 10000 r/min. It was also shown that during H2 reduction process, when powder was heated up to 1250 ℃,which is near the eutectic temperature, liquid phase was formed in the powder, leading to alloy of elements, shrink of the particle and increase of bulk density. Powder obtained had particle size from 10 μm to 50 μm, with mean particle size around 25 μm. SEM shown that cobalt phase was uniformly distributed in the particle.
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2014, Vol. 21 
