Morphology of WC-Co composite powders prepared by different W-source materials

Using WC-6 % Co as the basic ingredient, cobalt acetate, ultra-pure carbon, organic carbon are mixed with WO_2.72, WO₃, APT and AMT, respectively. After wet milled in the inclinable rolling mill with pure water, the slurry is formed. By sufficiently stirring and then spray drying the slurry, the precursor powders are prepared. After being calcined, sieved and weighted, the precursor powders are pushed into 1 100 ℃ high temperature Mo wire furnace with H₂ to prepare WC-6Co composite powders. The results show that the particle size of the WC-6Co composite powders prepared by using WO_2.72 as raw material is 1~45 μm, with average particle size of 23.38 μm; the particle sizes are 8~35 μm with average particle size of 22.58 μm and 1~34 μm with average particle size of 12.81 μm, as well as 3~45 μm with average particle size of 17.83 μm by using WO₃, APT and AMT as raw materials, respectively. The order of powder sphericity from good to bad is WO₃, WO_2.72, AMT and APT. The order of bulk density from large to small is WO₃, WO_2.72, APT, AMT. By measuring powders'BET, WC grain sizes of powders prepared by using WO_2.72、WO₃、AP and AMT as raw materials are 400 nm, 252 nm, 255 nm, 26 nm, respectively.