硬质合金增韧补强机理研究进展

综述了添加稀土元素在细化晶粒、提高致密度、净化界面、改善黏结相等方面对硬质合金的强韧化作用,同时探讨了添加纳米材料在弥散强化、晶须拔出、裂纹偏转、裂纹桥接等方面对硬质合金性能的影响。在此基础上还探讨了硬质合金材料增韧补强的未来研究方向,为制备综合性能好的新型硬质合金材料提供思路。

Research progress on toughening and strengthening mechanism of cemented carbide

With the continuous development of the manufacturing industry, the requirements for the comprehensive performance of cemented carbide are getting higher and higher, but there is a contradiction between the hardness and strength of the traditional cemented carbide, which limits its development. Therefore, the preparation of a cemented carbide having both high hardness and high strength has attracted attention. This paper reviews the strengthening of cemented carbide by adding rare earth elements in refining grains, increasing density, purifying the interface, improving the binder phase and adding nano materials in dispersion strengthening, whisker extraction, crack deflection and crack bridging. However, some mechanisms of action have not yet been fully recognized and further research is needed. On this basis, the future research direction of toughening and strengthening of cemented carbide materials is also discussed, and ideas for the preparation of new cemented carbide materials with good comprehensive performance are provided.