Journal of Inorganic Materials ›› 2023, Vol. 38 ›› Issue (11): 1265-1270.DOI: 10.15541/jim20230214

Special Issue: 【结构材料】陶瓷基复合材料(202312)

• RESEARCH ARTICLE • Previous Articles     Next Articles

Temperature Dependence of Residual Tensile Stresses and Its Influences on Crack Propagation Behaviour

LI Haiyan1,2(), KUANG Fenghua2, WU Haolong1,2, LIU Xiaogen1,2, BAO Yiwang1,2(), WAN Detian1,2()   

  1. 1. China Building Material Test & Certification Group Co., Ltd., Beijing 100024, China
    2. State Key Laboratory of Green Building Materials, China Building Materials Academy, Beijing 100024, China
  • Received:2023-05-05 Revised:2023-06-02 Published:2023-06-15 Online:2023-06-16
  • Contact: BAO Yiwang, professor. E-mail: ywbao@ctc.ac.cn;
    WAN Detian, professor. E-mail: dtwan@ctc.ac.cn
  • About author:LI Haiyan(1989-), female, PhD. E-mail: lihaiyan@ctc.ac.cn
  • Supported by:
    National Key R&D Program of China(2021YFB3702300);National Natural Science Foundation of China(52032011);National Natural Science Foundation of China(52072356);Young Elite Scientists Sponsorship Program by BAST

Abstract:

To study the mechanical properties at high temperature of pre-stressed ceramics which were prepared by using higher expansion coefficient materials as coating and lower expansion coefficient materials as substrate, zirconia and alumina were chosen as the coating and the substrate, respectively, to fabricate ZrO2-Al2O3 (marked as ZcAs) pre-stressed ceramics with sandwich structure. Meanwhile, Al2O3-ZrO2 pre-stressed ceramics (marked as AcZs, which has the similar section ratio between substrate and coating to ZcAs), ZrO2 ceramics and Al2O3 ceramics were set as the reference samples. Combining the results of bending strength at different temperatures with the results of Vickers indentation, the existence form of residual stress and its influence on crack propagation behavior were clarified as well as the temperature dependence of residual stress. Results show that the residual tensile stress exists in the surface layer of ZcAs, while the compressive stress exists in the substrate. On the contrary, the compressive stress exists in the surface layer of AcZs and tensile stress exists in the substrate. Due to tensile stress promoting while compressive stress inhibiting crack growth, flexural strength of ZcAs is 13.2% lower than that of Al2O3, and AcZs possesses strength 25.0% higher than that of ZrO2 at room temperature. In addition, both tensile stress and compressive stress are decreased with the increase of temperature, which is mainly attributed to the relaxation of pre-stress caused by high temperature.

Key words: ZrO2-Al2O3 pre-stressed ceramics, tensile stress, flexural strength, temperature dependence

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