摘要
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。
TiCN-based functionally graded cermet was fabricated by microwave heating nitriding sintering. The microstructure and chemical composition of the materials were analyzed by super depth of field microscope, electronic probe and scanning electron microscope with energy spectrum analysis. The effects of sintering temperature on the microstructure and mechanical properties of the cerment were studied. The results show that with temperature rising, the mechanical properties of the materials firstly increase and then decrease. The better comprehensive mechanical properties is obtained at 1500 ℃, which the bending strength, hardness and fracture toughness is 1456 MPa, 90.7 HRA and 10.06 MPa·m1/2, respectively. The toughness mechanism of the material is fine grain strengthening and toughening, crack deflection and crack bridging. A new core-ring structure is discovered in the prepared cermet substrate, which has a role in improving the mechanical properties of the material.
出处
《热加工工艺》
CSCD
北大核心
2015年第18期103-106,共4页
Hot Working Technology
基金
国家自然科学基金项目(51305134)
湖南省科技计划项目(2013GK3092)
关键词
碳氮化钛
微波加热
梯度功能
氮化
力学性能
TiCN
microwave heating
functionally gradient
nitridation
mechanical properties
