以高熵合金作为黏结相的WC基硬质合金的研究进展

Research Progress of WC-Based Cemented Carbide with High Entropy Alloy as Binder

WC-Co硬质合金在制造业中应用广泛,高性能、低成本黏结相的选择和设计是当前硬质合金黏结相替代领域的难点和热点。高熵合金(HEA)作为黏结相可细化WC晶粒,提高硬质合金的硬度、断裂韧性、耐腐蚀性和抗氧化性。本文分别从HEA黏结相成分设计、WC-HEA制备技术、微观组织结构、综合性能等方面概述WC-HEA硬质合金的研究进展,阐述了该领域所面临的烧结特性差、易产生相变等问题。以期为HEA作黏结相的强韧化机理的探讨、WC-HEA复合材料的组织-力学性能间构效关系的揭示提供参考。

WC-Co cemented carbide is widely used in the manufacturing industry,but how to select and design highperformance and low-cost binders is the current difficulty and hotspot in the field of replacing binders with cemented carbides.High entropy alloys(HEA)as binders can refine WC grains and improve the hardness,fracture toughness,corrosion resistance,and oxidation resistance of cemented carbide.This paper outlines the research progress of WC-HEA cemented carbide in terms of HEA binder composition design,WC-HEA preparation technology,microstructure,and comprehensive performance and describes the problems faced in this field such as poor sintering characteristics and susceptibility to phase transformation.It is intended to provide a reference for the exploration of the toughening mechanism of HEA as a binder phase and revealing the constitutive relationship between microstructureand mechanicalproperties of WC-HEA compositesin subsequent research.