制备纳米WC的热力学分析  

Thermo-dynamics Analysis of Synthesis Nano-WC

作　　者：胡驰[1] 唐子雷[1] 吴健春[2] 

机构地区：[1]四川建筑职业技术学院材料系,四川德阳618000 [2]攀钢集团研究院有限公司,四川成都611731

出　　处：《热加工工艺》2012年第12期44-46,共3页Hot Working Technology

摘　　要：以钨粉为钨源,酚醛树脂(PF)为碳源,采用溶胶-凝胶法制备碳化钨(WC)。通过X射线衍射、扫描电镜对样品进行表征。从热力学系统分析W氧化物的还原过程,WC的合成过程,以及碳化时间和碳化温度对产物的影响。结果表明:钨的化合物主要是由H2还原成钨单质,其形成过程为WO3→WO2.9→WO2.72→WO2→W;WC的形成过程为W2C→WC→W2C。The nano-tungsten carbide particles were prepared using sodium tungstate as tungsten source and phenol formaldehyde resin （PF） as carbon source by sol-gel. X-ray diffraction （XRD）, scanning electron microscopy （SEM） were used to characterize the samples and the precursors. The factors which can affect the samples, including carbonization time and carbonization temperature,and W oxide reduction process, WC synthesis process were systematically investigated by thermo-dynamics. The results show that tungsten oxide can change into tungsten mainly by H2 following as WO3→WO29→ WO2.72→WO2→W; the forming process of WC is W2C→WC→W2C.

关 键 词：溶胶-凝胶法 碳化钨 热力学 

分 类 号：TB383[一般工业技术—材料科学与工程]