Effect of Boron Carbide Content on the Microstructure and Mechanical Properties of Ti(C,N)-based Cermets Prepared by Low Pressure Sintering AITranslate

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Chinese Library Classification Number:TF124[冶金工程—粉末冶金]

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Ti(C,N)-based cermets were prepared by low pressure sintering.The effect of boron carbide(BN)content on the microstructure and mechanical properties of Ti(C,N)-based cermets was studied.The results show that the microstructure of sintered cermets shows a typical core-rim structure.The size of black cores in cermets decreases and the amount of white core-gray rim structure is improved with the increase of BN content.BN addition leads to more homogenous microstructure.Besides,the results reveal that the wettability between hard phase and binder phase is decreased,and the porosity of cermets improves with the BN content increasing.However,the modified microstructure by the appropriate addition of BN results in higher mechanical properties of the cermets.Hardness of Ti(C,N)-based cermets is improved to the maximum of 1710 HV₃₀,when the content of BN is 1.5%.With 2.0%BN addition,the cermet has the maximum toughness of 9.4 MPa·m^1/2,improved by about 10.59%compared with the samples without BN.More than 1.5%BN decreases the transverse rupture strength,and less transgranular fracture and more intergranular fracture are observed.In conclusion,when the content of BN is 1.5%,Ti(C,N)-based cermet samples have the best comprehensive mechanical properties.