不同方法制备的球形铸造碳化钨粉末的性能研究

球形铸造碳化钨粉末是一种新型的超耐磨陶瓷颗粒材料,对比研究了不同方法制备的球形铸造碳化钨粉末的化学成分、显微形貌、微观组织、相结构、显微硬度、流动性以及松装密度等特性。结果表明:相对等离子重熔球化法和感应重熔球化法而言,等离子旋转电极雾化法制备的球形铸造碳化钨的总碳含量与共晶碳含量理论值的偏差最小、游离碳和杂质含量最低;粉末颗粒内部更致密、共晶组织更细密、显微硬度最高。感应重熔球化方法制得的粉末流动性最好、松装密度最大。

Study on the properties of spherical cast tungsten carbide powders prepared by different methods

The spherical cast tungsten carbide powder is a kind of new potential wear-resistance ceramic material. The chemical composition,morphology,microstructure,phase composition,micro-hardness,flowability,loose density and other characteristics of spherical cast tungsten carbide powders prepared by different methods were in-vestigated. The results indicate that,compared with plasma re-melting spheroidizing and induction re-melting spheroidizing,the deviation value between the total carbon content and the theoretical carbon content of spherical cast tungsten carbides fabricated by plasma rotation electrode atomization method is the smallest,and the content of free carbon and impurities are the lowest. Furthermore,the corresponding powder particles fabricated by plas-ma rotation electrode atomization method are denser,the eutectic microstructure is finer and microhardness is higher than those fabricated by other methods. Spherical cast tungsten carbides fabricated by induction re-melting spheroidizing have the best flowability and the highest loose density.