H2W3O10对溶胶-凝胶法制备纳米WC的影响
Effect of H2W3O10 on Synthesis of Nano-tungsten Carbide by Sol-gel
胡 驰1,2, 周大利1, 罗宇智1
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作者单位：1. 四川大学 材料科学与工程学院, 四川 成都 610064; 2. 四川建筑职业技术学院 材料系, 四川 德阳 618000
中文关键字：溶胶-凝胶法； 纳米碳化钨； H2W3O10
英文关键字：sol-gel; nano-WC; H2W3O10
中文摘要：以钨酸钠为钨源，酚醛树脂(PF)为碳源，采用溶胶-凝胶法制备碳化钨(WC)。通过紫外吸收光谱(UV)、X射线衍射(XRD)、扫描电镜(SEM)及透射电镜(TEM)对样品进行表征。结果表明：钨酸溶胶在有机溶剂中受热时会析出对WC颗粒大小、均匀性及碳化温度起决定性影响的H2W3O10；前驱体中未含有H2W3O10时，在900 ℃碳化1～2 h，能制备出粒径为30～60 nm，且沿(100)择优取向、晶面间距为0.25 nm的WC。
英文摘要：The nano-tungsten carbide particles were prepared by using sodium tungstate as tungsten source and phenol formaldehyde resin (PF) as carbon source by sol-gel. The samples and the precursors were characterized by UV absorption spectrum (UV), X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) The results show that, while heating tungstic acid sol in organic solvents, the white H2W3O10 generates, which is the decisive impact factor of the sintering temperature and the uniform distribution of WC particles. When the precursor without H2W3O10 is carbonized at 900℃, WC particles with (100) orientation evenly distributing with the size of 30～60 nm, could be fabricated, whose interplanar spacing is 23 nm.