PAS原位合成WC陶瓷的反应历程  

Reaction Process of PAS In-situ Synthesis of WC Ceramics

作　　者：董晔[1] 王传彬[1] 沈强[1] 张联盟[1] 

机构地区：[1]武汉理工大学材料复合新技术国家重点实验室,武汉430070

出　　处：《硅酸盐通报》2016年第3期705-709,共5页Bulletin of the Chinese Ceramic Society

摘　　要：以WO_3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,WO_3与炭黑先反应生成WO_(2.72),再进一步转化为WO_2;1000℃以上,WO_2与炭黑反应生成W_2C和WC,随后缺碳相W_2C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:WO_3→WO_(2.72)→WO_2→W_2C→WC。Tungsten carbide（ WC） ceramics were in-situ synthesized by plasma activatedsintering（ PAS）,using the WO3 and carbon black mixed powders as the reactants. The reaction process was studied by means of thermal analysis,X-ray diffraction and thermodynamic calculation,so as to clarify the phase evolution during the PAS in-situ synthesis. With the increasing of synthetic temperature,WO3 began to react with carbon black to form WO2. 72 and WO2 successively,and then WO2 was further transformed into W2C and WC above 1000 ℃. At 1300 ℃,single-phased WC was obtained after the carbonization of W2C to WC. It was therefore concluded that the reaction process of the PAS in-situ synthesis of WC ceramics could be WO3→WO2. 72→WO2→W2C→WC.

关 键 词：WC陶瓷 PAS原位合成 反应历程 WO3/炭黑混合粉末 

分 类 号：TG146[一般工业技术—材料科学与工程]