以WO3和炭黑的混合粉末为原料,采用等离子活化烧结(PAS)工艺,经原位反应、烧结合成WC陶瓷.利用热分析、XRD和热力学计算对反应历程进行研究,确定了合成过程中各物相的演变规律.结果表明:随着合成温度的升高,WO3与炭黑先反应生成WO2.72,再进一步转化为WO2;1000℃以上,WO2与炭黑反应生成W2C和WC,随后缺碳相W2C继续被碳化为WC,并在1300℃时生成物相单一的WC相.PAS原位合成WC陶瓷的反应历程为:WO3 →WO2.72→WO2→W2C→WC.
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