高性能阴极基体用超细钨粉的制备

采用反向滴加沉淀法、微乳法和溶胶-凝胶法3种液相方法合成超细WO3，然后将超细WO3在高纯氢气氛中还原成超细钨粉。XRD，SEM和数学统计分布软件结果分析表明，溶胶-凝胶法得到立方相钨粉，颗粒大小均匀且具有良好的球形度，平均粒径约为200nm，满足高性能阴极基体的要求。微乳法制备的钨粉形貌为片状，不适合作阴极基体的原始粉料。

Preparation of Ultra-Fine Tungsten Powder Used in High Property Cathodes

Ultra-fine WO3 particles were prepared by reverse setting, microemulsion and sol-gel methods respectively and were reduced into ultra-fine tungsten powders in hydrogen atmosphere. The products were analyzed by XRD, SEM and Math-statistical software. The tungsten powders prepared by different methods were all with cubic structure. The tungsten powder prepared by sol-gel method could be satisfied to applied requirement in high performance cathodes, it had both uniform size distribution and good degree of sphericity and average grain size of about 200 nm. The appearance of the tungsten powder prepared by microemulsion method was sheet-like, hence it was not suitable for using as the primal powder in fabricating cathodes.