摘要
采用热压烧结方法制备Al2O3/Ti(C,N)-Nb-Cr-Y2O3复合陶瓷材料,并用扫描电子显微镜观察分析材料的微观结构。通过调整热压烧结工艺,研究烧结温度和保温时间对Al2O3/Ti(C,N)-Nb-Cr-Y2O3材料的显微组织与力学性能的影响。研究发现:烧结温度能显著影响陶瓷材料的显微组织和力学性能,温度在低于1650℃范围内,材料的致密度随温度升高而提高,力学性能也随之提升;但烧结温度超过1650℃时,晶粒异常长大,材料性能降低。热压烧结的保温时间以15min为宜。在烧结温度为1650℃、保温时间15min下,热压烧结Al2O3/Ti(C,N)-Nb-Cr-Y2O3陶瓷复合材料的力学性能良好,抗弯强度、维氏硬度、断裂韧度分别为735MPa、20.45GPa、8.9MPa·m1/2。
AI203/Ti （C, N）-Nb-Cr-Y203 composite ceramic materials were fabricated by hot-pressing method. , and the microstructures of the materials were analyzed by scanning e- lectron microscopy. By adjusting the hot pressing process, the effects of sintering tempera- ture and holding time on the microstructures and mechanical properties of A1203/Ti （C, N）-Nb-Cr-Y203 composite ceramic materials were investigated. The results indicate that the sintering temperature can significantly affect the microstructure and mechanical properties of ceramic materials. In the temperature range of lower than 1650~C ,the densities of the mate- rials increase with increasing hot pressing temperature, and the mechanical properties are al- so improving. When the hot sintering temperature is above 1650℃, the increase of tempera- ture will lead to the overgrowth of grains and the decrease of mechanical properties. Appro-priate holding time is 15min. The A1203/Ti （C, N）-Nb-Cr-YzO3 ceramic composite hot- pressed at 1650℃ for 15min achieves better mechanical properties, the bending strength is 735MPa,the Vicker＇ s hardness is 20. 45GPa,the fracture toughness is 8.9MPa.m1/2
出处
《沈阳理工大学学报》
CAS
2015年第5期1-6,共6页
Journal of Shenyang Ligong University
基金
国家自然科学基金资助项目(51274143)
沈阳理工大学重大学科建设基金资助项目(lg1205)
