残余拉应力的温度依赖性及其对裂纹扩展行为的影响

doi:10.15541/jim20230214

无机材料学报 ›› 2023, Vol. 38 ›› Issue (11): 1265-1270.DOI: 10.15541/jim20230214

所属专题：【结构材料】陶瓷基复合材料(202312)

残余拉应力的温度依赖性及其对裂纹扩展行为的影响

李海燕¹^,²(), 旷峰华², 吴昊龙¹^,², 刘小根¹^,², 包亦望¹^,²(), 万德田¹^,²()

1.中国国检测试控股集团股份有限公司, 北京 100024
2.绿色建材国家重点实验室, 中国建筑材料科学研究总院, 北京 100024

收稿日期:2023-05-05 修回日期:2023-06-02 出版日期:2023-06-15 网络出版日期:2023-06-16
通讯作者: 包亦望, 教授. E-mail: ywbao@ctc.ac.cn;
万德田, 教授. E-mail: dtwan@ctc.ac.cn
作者简介:李海燕(1989-), 女, 博士. E-mail: lihaiyan@ctc.ac.cn
基金资助:
国家重点研发计划(2021YFB3702300);国家自然科学基金(52032011);国家自然科学基金(52072356);北京市科学技术协会青年人才托举工程

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. 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

摘要/Abstract

摘要：

为研究以高膨胀系数的陶瓷为涂层, 低膨胀系数的陶瓷为基体的预应力陶瓷的高温力学性能, 本工作以氧化锆为涂层, 氧化铝为基体, 制得表层为拉应力的“三明治”结构ZrO₂-Al₂O₃(简称ZcAs)预应力陶瓷。同时选用基体与涂层截面比值相近的Al₂O₃-ZrO₂(简称AcZs)预应力陶瓷、纯ZrO₂和纯Al₂O₃陶瓷为参照样。结合不同温度下的弯曲强度测试结果及维氏压痕结果, 阐明预应力的存在形式及其对裂纹扩展行为的影响, 并研究预应力的温度依赖性。结果表明: ZcAs预应力陶瓷的表层受拉应力, 基体受压应力; 而AcZs预应力陶瓷的表层受压应力, 基体受拉应力。由于拉应力能够促进裂纹扩展, 而压应力能够抑制裂纹扩展, 因此室温下, ZcAs的强度比纯Al₂O₃陶瓷降低13.2%, 而AcZs的强度比纯ZrO₂陶瓷提高25.0%。此外, 无论表层是拉应力还是压应力, 都随着温度升高而降低, 这主要归因于高温导致的预应力松弛。

关键词: ZrO₂-Al₂O₃预应力陶瓷, 拉应力, 弯曲强度, 温度依赖性

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

中图分类号:

TQ174

李海燕, 旷峰华, 吴昊龙, 刘小根, 包亦望, 万德田. 残余拉应力的温度依赖性及其对裂纹扩展行为的影响[J]. 无机材料学报, 2023, 38(11): 1265-1270.

LI Haiyan, KUANG Fenghua, WU Haolong, LIU Xiaogen, BAO Yiwang, WAN Detian. Temperature Dependence of Residual Tensile Stresses and Its Influences on Crack Propagation Behaviour[J]. Journal of Inorganic Materials, 2023, 38(11): 1265-1270.

图/表 5

图1 (a)ZcAs和(b)AcZs预应力陶瓷的截面SEM照片

Fig. 1 Cross-sectional SEM images of (a) ZcAs and (b) AcZs

图2 (a)ZcAs预应力陶瓷的结构示意图和(b)受力状态示意图

Fig. 2 Schematic diagrams of (a) structure for ZcAs and (b) stress distribution in ZcAs

图3 维氏压痕图

Fig. 3 Indentation crack by Vicker’s hardness tester (a, b) Vickers indentation in the coating (a) and the substrate (b) of ZcAs; (c, d) Vickers indentation in the coating (c) and the substrate (d) of AcZs; Direction of the interface between coating and substrate is set as horizontal axis

图4 不同样品的三点弯曲强度随温度的变化曲线

Fig. 4 Flexural strength of different samples measured at different temperatures (a) Al2O3 ceramics and ZcAs; (b) ZrO2 ceramics and AcZs

图5 (a) ZcAs和(b) AcZs预应力陶瓷中残余应力随温度的变化曲线

Fig. 5 Calculated residual stress in (a) ZcAs and (b) AcZs tested at different temperatures

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残余拉应力的温度依赖性及其对裂纹扩展行为的影响

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

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