Study on mechanical properties of hot pressing sintered mullite-ZrO2 composites with finite element method
Study on mechanical properties of hot pressing sintered mullite-ZrO2 composites with finite element method
复制标题
热压烧结莫来石-ZrO2复合材料力学性能的有限元研究
DOI：
10.1016/j.ceramint.2018.01.146
复制
发表时间：
2018
影响因子：
5.2
通讯作者：
Wu Gaolong
中科院分区：
文献类型：
--
作者：
Yu Hui;Chen Yongjun;Guo Xiaodong;Luo Lijie;Li Jianbao;Li Wei;Xu Zhichao;Li Tianfeng;Wu Gaolong
采用热压烧结法制备了莫来石-氧化锆（ZrO 2）复合材料。研究了烧结温度和保温时间对复合材料显微组织、相组成和力学性能的影响。结果表明：t-ZrO 2晶粒尺寸随烧结温度和保温时间的变化而变化，当烧结温度为1500 °C，保温时间分别为20和60 min时，其抗弯强度和断裂韧性分别达到最大值674.05 MPa和12.08 MPam 1/2。首次采用有限元法分析了莫来石-ZrO 2复合材料的晶粒尺寸与力学性能的关系。结果表明，随着t-ZrO 2晶粒尺寸的增大，莫来石-ZrO 2界面最大应力增大，显著促进了晶界裂纹的产生和扩展，降低了莫来石-ZrO 2复相陶瓷的抗弯强度和断裂韧性。
In this study, mullite–zirconia (ZrO2) composites were fabricated by hot pressing sintering method. The effects of sintering temperature and holding time on the microstructures, phase compositions and mechanical properties of the composites were investigated. The results indicated that the size of t-ZrO2grain varies with sintering temperature and holding time, and the maximum flexural strength of 674.05 MPa and fracture toughness of 12.08 MPam1/2are obtained when the sintering temperature is 1500 °C with holding times of 20 and 60 min, respectively. Finite element method was employed to analyze the relationship between grain size and mechanical properties of mullite–ZrO2composites for the first time. The results showed that the maximum stress on mullite–ZrO2interface increases with the growth of t-ZrO2grain size, which enhances the generation and propagation of cracks on grain boundaries significantly and degrades the flexural strength and fracture toughness of the mullite–ZrO2composite ceramics.