Study on mechanical properties of hot pressing sintered mullite-ZrO2 composites with finite element method

被引：20

作者：

Yu, Hui ^{[1
]}

Chen, Yongjun ^{[1
]}

Guo, Xiaodong ^{[1
]}

Luo, Lijie ^{[1
]}

Li, Jianbao ^{[1
]}

Li, Wei ^{[1
]}

Xu, Zhichao ^{[1
]}

Li, Tianfeng ^{[1
]}

Wu, Gaolong ^{[1
]}

机构：

[1] Hainan Univ, Coll Mat & Chem Engn, State Key Lab Marine Resource Utilizat South Chin, Haikou 570228, Hainan, Peoples R China

来源：

CERAMICS INTERNATIONAL | 2018年 / 44卷 / 07期

基金：

国家高技术研究发展计划(863计划); 中国国家自然科学基金;

关键词：

Mullite; ZrO2; Hot pressing; Mechanical properties; Finite element analysis; Grains and interfaces; TIO2; ADDITION; ZIRCONIA; MICROSTRUCTURE; SILLIMANITE; BEHAVIOR; CREEP;

D O I：

10.1016/j.ceramint.2018.01.146

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

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-ZrO2 grain varies with sintering temperature and holding time, and the maximum flexural strength of 674.05 MPa and fracture toughness of 12.08 MPa m(1/2) are obtained when the sintering temperature is 1500 degrees 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-ZrO2 composites for the first time. The results showed that the maximum stress on mullite-ZrO2 interface increases with the growth of t-ZrO2 grain size, which enhances the generation and propagation of cracks on grain boundaries significantly and degrades the flexural strength and fracture toughness of the mullite-ZrO2 composite ceramics.

引用

页码：7509 / 7514

页数：6

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