化学沉淀法制备超细WC-Co复合粉的研究

摘要

Using ammonium paratungstate and cobalt nitrate as raw materials, ultrafine WC-Co composite powder was prepared by direct reduction&carburization method under the vacuum condition. The effects of feed concentration, reaction temperature and pH value of the mother liquor after reaction on precursor oxide particle size and yield are studied. The morphology and composition of the ultrafine WC-Co composite powder are measured by SEM and XRD. Results show the ultrafine WC-Co composite powder is characterized by regular morphology and good dispersion. This method has advantages of low cost of raw material and simple process.%以钨酸铵和硝酸钴为原料,经化学沉淀后煅烧,然后在真空气氛下直接还原碳化制得超细WC-Co复合粉.考察了化学沉淀过程中料液浓度、反应温度和反应后母液的pH值等因素对所得前驱体氧化物粒度及收率的影响.用XRD和扫描电镜对所得超细WC-Co复合粉进行了分析和观察.结果表明,采用这种方法可以制取形貌规则,分散性良好的超细WC-Co复合粉,并且此法原料成本低,工艺简单,过程易控.