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关于纳米WC/Co复合粉制备技术的研究报道有很多,但实现产业化的技术方案较少。本文在自主研发设计的离子交换系统、高温流态化床等设备平台上,以偏钨酸铵(AMT)、碳酸钴(Co CO3)、乙二胺四乙酸(C10H16N2O8)为原料,首先采用离子交换、溶液复合法得到一定配比的钨钴复合溶液,然后进行喷雾干燥、煅烧得到前驱体钨钴复合氧化物,最后在高温流态化床中连续还原-碳化-调碳后得到不同钴含量的纳米WC-Co复合粉末,采用SEM、XRD等分析方法对粉末进行形貌观察及物相分析。制备所得WC/Co复合粉质量稳定,具有杂质含量低、碳化率高、游离碳含量低的特点,其中WC的亚晶尺寸小于100 nm,表明所开发的产业化技术切实可行。
There are many reports about the preparation technology of nano-sized WC / Co composite powder, but there are few technical solutions to realize industrialization. In this paper, ion exchange system, high temperature fluidized bed and other equipment platform developed independently are made of AMT, Co CO3 and C10H16N2O8, Exchange and solution complex method to obtain a certain proportion of the tungsten-cobalt composite solution, and then spray-drying and calcining to obtain a precursor tungsten-cobalt composite oxide, and finally obtaining the cobalt content in the high-temperature fluidized bed after continuous reduction-carbonization- Of nano WC-Co composite powder, morphology and phase analysis of the powder by SEM, XRD and other analytical methods. The prepared WC / Co composite powder has the characteristics of stable quality, low impurity content, high carbonization rate and low free carbon content, and the subgrain size of WC is less than 100 nm, indicating that the industrialized technology developed is feasible.