纳米碳化钨粉末的制备与微观结构表征  

Preparation and microstructure characterization of nano tungsten carbide powder

作　　者：杨寅臻 董洪峰[1] 李培友[1] 户晓南 刘波波 YANG Yin-zhen;DONG Hong-feng;LI Pei-you;HU Xiao-nan;LIU Bo-bo(School of Materials Science and Engineering,Shaanxi University of Technology,Hanzhong 723001,China)

机构地区：[1]陕西理工大学材料科学与工程学院,陕西汉中723001

出　　处：《材料热处理学报》2022年第11期85-93,共9页Transactions of Materials and Heat Treatment

基　　金：陕西省教育厅专项科研计划项目(20JK0563);陕西省自然科学基础研究计划青年项目(2020JQ-870)。

摘　　要：以偏钨酸铵水合物和可食用蔗糖为原料,在液相均相反应体系中制备出前驱体粉末,再采用还原-碳化法合成纳米碳化钨(WC)粉末。分别使用X射线衍射仪和扫描电镜来表征粉末试样的物相组成和微观结构,并且分析了合成机理。结果表明:当合成温度为1400℃时,可以制备出单相WC粉末,当合成温度为1350℃时,可以获得等轴状WC颗粒。然而,合成温度达到1450℃时,出现条状颗粒和异常长大的颗粒。此外,引入过量C源有利于碳化反应的进行,还能通过增加反应接触面积和缩短C原子扩散距离来细化WC颗粒。Using ammonium metatungstate hydrate and edible sucrose as raw materials, precursor powder was prepared in a liquid-phase homogeneous reaction system, and then nano tungsten carbide(WC) powder was synthesized by reduction-carbonization method. X-ray diffractometer and scanning electron microscopy were used to characterize the phase composition and microstructure of the powder samples, and the synthesis mechanism was analyzed. The results show that the single-phase WC powder can be prepared when the synthesis temperature is 1400 ℃, and equiaxed WC particles can be obtained when the synthesis temperature is 1350 ℃. However, when the synthesis temperature reaches 1450 ℃, strip particles and abnormally grown WC particles appear. In addition, the introduction of excess C source is conducive to the carbonation reaction, and WC particles can be refined by increasing the reaction contact area and shortening the diffusion distance of C atoms.

关 键 词：纳米碳化钨粉末 还原-碳化法 物相组成 颗粒尺寸 

分 类 号：TG135.5[一般工业技术—材料科学与工程]