硬质合金中WC晶粒内部微孔形成原因探讨

利用扫描电镜对以蓝钨与黄钨为原料制得的粗颗粒W粉、WC粉进行形貌观察,并与其对应的WC-Co硬质合金金相组织进行了对比。以此为基础对硬质合金中WC晶粒内部微孔这一比较常见的现象作出解释,即合金中WC晶粒内部微孔主要来源于原料W粉。实验结果表明,选用蓝钨为硬质合金生产原料可使合金中WC晶粒内部微孔明显减少,从而使合金的综合性能得到提高。

DISCUSSION ON CAUSE OF MICROPORE FORMATION IN WC GRAIN OF CEMENTED CARBIDE

By Using SEM,the morpholoth of coarse particle W powder and WC powder manufactured by blue tungsten and yellow tungsten as raw materials has been observed and a comparison between the microstructure of the corresponding WC-Co cemented carbide phases has been made. On such base,a common phenomenon of micropore in WC grain of cemented carbide has been explained. Namely,the micropore in WC in alloy was mainly yielded from raw material W powder. Experimental results show that choosing blue tungsten as raw materials to produce cemented carbide can obviously decrease the micropore in WC grain of cemented carbide. Therefore,the comprehensive properties of the alloy can be improved.