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本文在喷雾转换法制备WC/Co纳米复合粉的基础上,采用乙二胺四乙酸与碳酸钴复合法制备高钴含量的WC/Co纳米复合粉,突破了原有技术的钴含量质量分数上限7%的瓶颈限制。采用DSC-TG分析、SEM分析、XRD分析等方法,对乙二胺四乙酸和碳酸钴的参与反应的机理进行了研究,并确定了采用新工艺制备WC/Co纳米复合粉的相关参数。实验结果表明:乙二胺四乙酸与碳酸钴反应所得有机钴盐为一种溶解度较高的螯合物,在较低温度下煅烧可分解,适用于WC/Co纳米复合粉前驱体溶液中钴含量的调节,避免了Cl-、NO3-等杂质离子的引入。通过新的复合工艺制备得到了适用于高温流态化床生产的前驱体粉末,最终制备得到钴含量质量分数8%的WC-Co纳米复合粉。
In this paper, WC / Co nano-composite powder prepared by spray conversion method, the preparation of high cobalt content WC / Co nanocomposite powder by ethylenediaminetetraacetic acid and cobalt carbonate complex method, breaking the upper limit of the cobalt content of the prior art 7% bottleneck limit. The reaction mechanism of ethylenediaminetetraacetic acid and cobalt carbonate was studied by DSC-TG, SEM and XRD. The relevant parameters of WC / Co nanocomposite powder prepared by the new process were determined. The experimental results show that the organic cobalt salt obtained by the reaction of ethylenediaminetetraacetic acid and cobalt carbonate is a chelate with high solubility and can be decomposed at a relatively low temperature for application in the cobalt Content regulation, to avoid the Cl-, NO3- and other impurity ions introduced. The precursor powder suitable for high-temperature fluidized bed production is prepared through a new composite process, and finally the WC-Co nano-composite powder with a cobalt content of 8% is obtained.