纳米WC粉末的制备研究

Study of Preparing Nanocystalline WC Powder

本文主要讲述了用低温碳化的方法制备平均晶粒度为20～30nm，颗粒尺寸小于100nm的纳米碳化钨粉末。并利用成分分析和DSC，SEM，XRD以及BET检测手段，对纳米级WC粉末进行了分析研究。通过对有机炭、活性炭和工业炭的对比研究发现，有机炭为较理想炭源，能在较低的温度下碳化，制备出合格的纳米碳化钨粉末。同时发现碳化的颗粒度与炭源有着紧密的关系，在钨粉原料相同的情况下，炭源的颗粒度越细，其制备出的碳化钨的颗粒也越细。而且在试验中研究发现，炭源对于碳化温度有明显的影响，在本试验所采取的三种不同炭源中，通过DSC和XRD的研究分析表明，碳化温度由低到高依次为有机炭〈活性炭〈工业炭。

This paper introduces the way of preparing nanocystalline WC which average grain size is about 20-30nm and average particle size is less than 100nm with low temperature carbonization method, and the WC powder is tested by composition analysis, DSC, XRD, SEM and BET method. Comparing with different type carbon, it is concluded that the organic carbon is the ideal raw material for preparing nanocrystalline WC. In the experiments, we find particle size of WC product is related to the kind of raw carbon black, and the particle size of products decreased with finer raw carbon black powder as raw materials. In addition, we also find that raw carbon black has an obvious effect on carburizing temperature, and carburizing temperature of organic carbon is lower than which of active carbon and industrial carbon.