Effects of Sintering Temperature on Microstructure and Mechanical Properties of Ti(C,N)-Based Cermet with Multi-Component Carbides in Ar+N2 Atmosphere
Ti(C,N)-based cermet was prepared by high temperature and low pressure sintering in Ar+N2 atmosphere with submicron Ti(C,N),different kinds of ultrafine carbides,ultrafine Co powder,and Ni powder as raw materials.The phase composition and microstructure of Ti(C,N)-based cermet were studied by X-ray diffraction(XRD)and scanning electron microscope(SEM).The Vickers hardness and fracture toughness of the specimens were calculated by the Vickers hardness tester.The results show that the sintering temperature is slightly higher than the traditional temperature due to the increase in the types of carbide components.When the sintering temperature is 1 470℃,the microstructure distribution of the cermet is uniform,and there is no obvious grain growth.The phase only have(Ti,M)(C,N)(M=W,Mo,Nb,and Ta)solid solution phase and Co+Ni bonding phase.At this time,the hardness and fracture toughness of the specimens match the best(1 730HV10 and 8.02 MPa·m1/2).Through the optimization of the sintering process,the cooperative regulation of microstructure and mechanical properties is realized.
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