无机材料学报2023，Vol.38Issue(11)：1265-1270,6.DOI:10.15541/jim20230214
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
摘要
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.关键词
ZrO2-Al2O3预应力陶瓷/拉应力/弯曲强度/温度依赖性Key words
ZrO2-Al2O3 pre-stressed ceramics/tensile stress/flexural strength/temperature dependence分类
化学化工引用本文复制引用
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):1265-1270,6.基金项目
国家重点研发计划(2021YFB3702300) （2021YFB3702300）
国家自然科学基金(52032011,52072356) （52032011,52072356）
北京市科学技术协会青年人才托举工程National Key R&D Program of China(2021YFB3702300) （2021YFB3702300）
National Natural Science Foundation of China(52032011,52072356) （52032011,52072356）
Young Elite Scientists Sponsorship Program by BAST （）
