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采用微波加热氮化烧结法制备了TiCN基梯度功能金属陶瓷,运用超景深显微镜、带有能谱的电子探针和扫描电镜分析了材料的微观组织和成分,研究了烧结温度对材料微观组织和力学性能的影响。结果表明:随烧结温度的升高,材料的力学性能先升高后降低。在1500℃获得较高的综合力学性能,分别为弯曲强度1456MPa,硬度90.7HRA,断裂韧性10.06 MPa·m1/2。材料的韧化机制为细晶强韧化,裂纹偏转,裂纹桥接。在所制备的金属陶瓷基体中,发现了一种新的芯-环结构,这种结构对材料力学性能的提高具有显著作用。
The TiCN-based gradient functional cermets were prepared by microwave heating and nitriding sintering method. The microstructure and composition of TiCN-based gradient functional cermets were analyzed by SEM, SEM and SEM. The effect of sintering temperature on microstructure and Effect of mechanical properties. The results show that with the increase of sintering temperature, the mechanical properties of the material first increase and then decrease. High mechanical properties were obtained at 1500 ℃, which were flexural strength of 1456MPa, hardness of 90.7HRA and fracture toughness of 10.06 MPa · m1 / 2, respectively. Toughening mechanism of the material is fine grain toughening, crack deflection, crack bridging. In the prepared cermet matrix, a new core-ring structure was found, which has a significant effect on the improvement of the mechanical properties of the material.