Research Progress of the Second Phase Composition Modified Cemented Carbides
The research progress of the second phase composition modified cemented carbides was systema-tically discussed,the modification mechanism,types of modifiers,and mechanical properties of WC-based cemented carbides modified by adding the second phase elements or compounds were introduced,and the improvement mechanism of mechanical properties of the cemented carbide by doping second phase was analyzed and summarized.The effect of modifying cemented carbides with different types and contents of additives is different.The effects of different additives and preparation methods on the mechanical proper-ties of cemented carbides were classified and compared.The results show that the comprehensive mechani-cal properties of cemented carbides are mainly related to the degree of grain refinement and micro-interface structure.The added second phase can form a certain coordination structure with the WC matrix,effective-ly inhibit the growth of WC grains,and thus improve the performance of the alloy.Finally,the current de-velopment bottlenecks and unresolved issues of the second phase composition modified cemented carbides are summarized.
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