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采用真空烧结方法制备了4种氮含量的Ti(C,N)基金属陶瓷,测试了试样的抗弯强度、硬度、断裂韧性等力学性能,用扫描电镜、能谱仪等研究了N含量对其显微组织及磨粒磨损行为的影响。结果表明:在一定范围内随N含量的增加,硬质相芯部逐渐细化且分布均匀,环形相厚度变薄、体积分数减小;磨粒磨损形貌中犁沟所占的比例减少,微观脆性断裂形成的凹坑增加,耐磨粒磨损性能逐渐提高。随N含量增加,Ti(C,N)基金属陶瓷的抗弯强度呈现出先增加后减小的趋势,断裂韧度逐渐递减,硬度变化不大。当N含量为3.6%时(文中含量均为质量分数),Ti(C,N)基金属陶瓷综合力学性能最佳,其抗弯强度为1 873 MPa,硬度为89.9 HRA,断裂韧度为20.7 MPa.m1/2。
Four kinds of Ti (C, N) -based cermets with nitrogen content were prepared by vacuum sintering. The mechanical properties such as flexural strength, hardness and fracture toughness of the samples were tested. The content of N was studied by scanning electron microscopy Its microstructure and abrasive wear behavior. The results show that in a certain range, with the increase of N content, the core phase of the hard phase is refined and distributed uniformly, the thickness of the annular phase becomes thinner and the volume fraction decreases; the proportion of furrows in the wear morphology decreases, The pits formed by micro-brittle fracture increase, and wear-resistant particles wear resistance gradually increases. With the increase of N content, the flexural strength of Ti (C, N) -based cermets first increases and then decreases, and the fracture toughness gradually decreases with little change of hardness. The Ti (C, N) -based cermets had the best mechanical properties at a N content of 3.6% (mass fraction in the text). The flexural strength was 1873 MPa, the hardness was 89.9 HRA and the fracture toughness was 20.7 MPa.m1 / 2.