掺杂与湿氢工艺制备超粗钨粉及其对合金性能的影响

Study on Preparation of Ultra-coarse Grain Tungsten Powder by Doping and Wet Hydrogen Processes and Its Effects on Cemented Carbide

通过控制送入炉内H_2O与H_2的分压比制备了超粗钨粉,并对所制钨粉及其后续产品物化性能进行了研究。结果表明:与掺杂工艺相比,在还原温度1 040℃、还原时间9 h、P_(H2O)/P_(H2)=0.7的条件下制得Fsss粒度为20μm的超粗钨粉及其制备的碳化钨,具有细颗粒少,均匀性好,晶体发育完整,纯度高等优点。用其制备的超粗WC-10%Co硬质合金晶粒粗大,细晶少,粒度分布窄,组织均匀,无异常晶粒、孔隙等缺陷,后续产品抗冲击性能和抗磨损性能提高。

Ultra-coarse grain tungsten powder was prepared by controlling the partial pressure ratio of water vapor and hydrogen sent into the reduction furnace,and the properties of the tungsten powder and subsequent products were studied.The results show that compared with the doping method,the ultra-coarse grain tungsten powder prepared at reduction temperature of 1 040℃,reduction time of 9 h and P（H2O）/P（H2）=0.7 has the particle size（Fsss）of about 20μm,and the ultracoarse grain W and WC powder have less fine particles,better uniformity,complete crystal development and high purity.The ultra-coarse grain WC-10%Co cemented carbide prepared with the above WC powder has coarse grain,less fine grain,narrow grain size distribution and uniform microstructure,no abnormal grain and porosity defects exsists in the alloy,and the impact resistance and thermal fatigue wear resistance of the subsequent products are improved to a certain extent.