纳米WC制备过程中混料工艺及抑制剂作用的研究

Study of the Blender Mode and Grain Growth Inhibitor during Preparing Nanocystalline WC Powder

利用成分分析和XRD，SEM以及BET等检测手段，对低温碳化工艺制备纳米级WC粉末进行了研究，制备了平均晶粒度在20～30nm，颗粒尺寸小于100nm的纳米碳化钨粉末。通过对滚筒混料和三维混料2种方式的对比研究发现，三维混料比传统的滚筒混料具有更高的效率，能使物料在较短的时间得到充分混合，三维混料2h即可达到滚筒混料6h同样的效果，并研究了不同混料时间和不同球料比对混料均匀度的影响。此外，还研究对比了钨粉原料中添加晶粒抑制剂V2O5对碳化工艺的影响，结果发现V2O5对碳化过程有延缓作用，但对WC产物品粒度及颗粒大小并无明显影响。

Nanocystalline WC powder was prepared by low temperature carbonization. The average grain size is about 20 - 30 nm and average particle size is less than 100 nm. The obtained WC powders are characterized by composition analysis, XRD, SEM and BET test. Comparing with the traditional rolling blender, it is concluded that three-dimensional blender has higher efficiency and can obtain materials with more uniformity. Three-dimensional blender needs only 2 hours to reach the blundering effects by using rolling blender for 6 hours. The effects of different ratio of grinding media to material and blender time on the uniformity of compounds were investigated. In addition, the effects of V2O5 inhibitor on carbonization were investigated. It shows that V2O5 retards reaction speed, but has little effect on grain size and particle size.