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以偏钨酸铵、可溶钴盐、有机碳为原料,经喷雾转化、煅烧、低温还原碳化制备WC-Co复合粉。对前驱体、复合粉物相组成、WC晶粒度、微观形貌、平均粒度及分布进行研究。结果表明:复合粉由WC和Co两相组成,WC晶粒度约为60 nm;前驱体粉末呈空壳球形结构,部分颗粒破裂;经煅烧后,形貌未发生明显变化;再经还原碳化处理,颗粒表面产生大量孔隙,形貌与前驱体相似,具有很好的形貌结构遗传特性;复合粉平均粒度比前驱体略有减小且粒度分布更窄;溶液浓度、给料速度越大,离心转速越小,则平均粒度越大;进气温度对粒度影响很小。
Ammonium metatungstate, soluble cobalt salt, organic carbon as raw material, spray-transformed, calcined, low temperature reduction carbonization prepared WC-Co composite powder. The precursor, composite phase composition, WC grain size, micro-morphology, average particle size and distribution were studied. The results show that the composite powder is composed of two phases of WC and Co, and the grain size of WC is about 60 nm. The precursor powder has a hollow spherical shell structure with some particles ruptured. After calcination, the morphology does not change obviously. The average particle size of the composite powder is slightly smaller than that of the precursor and the particle size distribution is narrower. The concentration of the solution and the feed rate are higher , The smaller the centrifugal speed, the greater the average particle size; inlet temperature has little effect on the particle size.