超粗晶WC-Co硬质合金的研究现状

超粗晶硬质合金是一类性能优异的新型合金,广泛用于采矿、凿岩、轧辊等领域,应用前景广阔。化学包覆法和纳米粉末溶解法是超粗晶WC-Co硬质合金制备的主要方法,介绍了超粗硬质合金原料WC颗粒平均粒度选择的动力学理论,碳含量对超粗合金中WC晶粒生长粗化的影响以及通过引入其它元素强化粘结相以提高合金寿命的探索结果。此外,分析了以合金硬度为常数时,晶粒尺寸与合金性能的关系,指出在保持合金硬度不变时,通过增大WC晶粒尺寸来提高合金的耐磨性和韧性是可行的。最后,展望了超粗晶合金的发展方向。

Research Status of Ultra Coarse Grained WC-Co Cemented Carbide

Ultra coarse cemented carbide is a new class of high performance alloys. It has been widely used in mining, rock drilling, rolling, etc., and it has broad application prospects. Chemical coating method and nano-powder dissolution method are the primary preparation techniques of ultra coarse grained WC-Co cemented carbide. The dynamic theory guiding the choice of average initial particle size of WC for the preparation of ultra coarse grained cemented carbide is introduced. The effect of carbon content on WC growth and the initial exploration of reinforcing cobalt binder phase by doping other elements to improve the service life of alloys are mentioned. In addition~ the relationship between WC grain size and the property of alloys while controlling the hardness at a constant value is analyzed, the result indicates that it is possible to increase both the abrasion resistance and the toughness of WC-Co by increasing WC grain size while keeping the constant hardness. Finally, the development trend of ultra coarse grained cemented carbide is prospected.