纳米碳化钨粉体的热稳定性研究  

Research of thermal stability of nanocrystalline tungsten carbide powder

作　　者：张春华[1] 郭亨群[1] 王国立[1] 宋志华[1] 吴冲浒 吴其山 

机构地区：[1]华侨大学信息科学与工程学院,福建泉州362021 [2]厦门金鹭特种合金有限公司,福建厦门361006

出　　处：《功能材料》2009年第3期486-489,共4页Journal of Functional Materials

基　　金：国家科技支撑计划课题资助项目(2007BAE05B01)

摘　　要：以工业化生产设备条件制备纳米碳化钨粉末,对样品在不同温度下退火,采用X射线衍射法(XRD)、比表面积法(BET)、冷场发射扫描电子显微镜(FESEM)、透射电子显微镜(TEM)、激光光散射法对退火前后样品的物相、粒度及其分布进行表征。研究结果表明,温度是影响纳米WC颗粒长大的一个重要因素,随着退火温度升高,纳米WC颗粒尺寸随之增大。同时在不同升温速率下测的DSC吸收峰值,计算了纳米WC颗粒的长大激活能。在此基础上,对实验现象产生的原因进行了分析讨论。Nanocrystalline tungsten carbide （nano-WC） powder was prepared on the basis of the industrialized production equipment and were annealed at various temperature. Methods of X-ray diffraction, FSEM, TEM, specific surface area, and particle analyzer of dynamic light scattering were applied to test the phase, particle size and its distribution of nano-WC powder. The results indicated temperature was a important factor to affect the grain growth of nano-WC. The grain size increased with the high temperature. The DSC curves of nano-WC powders were measured at difierent heating rates and the activation energy for grain growth of nano-WC was calculated. Then, these experiment phenomena were analyzed and discussed.

关 键 词：纳米碳化钨 粒度表征 表面能各向异性 

分 类 号：TB383[一般工业技术—材料科学与工程] TF122.1[冶金工程—粉末冶金]