基于表面改性的非均匀结构硬质合金研究进展

表面改性是使材料表面获得与其基体不同微观组织的处理技术,能够有效调控材料表面的力学性能.因此,将表面改性方法应用于改善硬质合金表面的微观组织,能够有效避免均匀结构硬质合金显微结构-宏观性能的局限性,为制备高性能非均匀结构硬质合金提供技术方案.由于硬质合金表面改性研究的起步较晚且表面改性方法较多,表面改性方法的选取及其改...

Research progress of inhomogeneous structure cemented carbide based on surface modification

Surface modification is the treatment technology that makes the tailored surface microstructure different from that of the matrix,which can efficiently control the mechanical properties of the material surface.Therefore,the surface modification can improve the microstructure of the cemented carbides,effectively avoid the limitation of the homogeneous structure cemented carbides on the microstructure and macroscopic properties,and provide the technical scheme for the preparation of the high performance inhomogeneous structure cemented carbides.Due to the late start of the surface modification research and a mass of surface modification methods,the selection of surface modification methods and the modification mechanism are still not clear.The material system,preparation mechanism,microstructure,and mechanical properties of the graded cemented carbides obtained by chemical surface modification were summarized in this paper,the methods and functions of the graded cemented carbide coatings obtained by physical surface modification were concluded.The application and research progress of the surface modification used for the cemented carbides were analyzed to provide the reference for the preparation of the cemented carbides with high wear resistance and good fracture toughness.