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Si3N4结合SiC耐火陶瓷高温抗疲劳断裂设计
袁虎, 杨自春, 赵爽, 孙文彩
海军工程大学舰船高温结构复合材料研究室,武汉 430033
摘要:
为探究高温氧化条件下材料抗疲劳断裂的相关改进措施,在分析材料高温疲劳断裂过程的基础上,将有效场-子域模型和热-损伤断裂强度模型相结合,对高温氧化条件下Si3N4结合SiC耐火陶瓷的微裂纹尺寸与强度和密度与强度的关系进行了模拟。结果表明:此类材料在高温氧化环境中微裂纹尺寸在(0 mm, 0.5 mm]和密度至少为(0 m-2,104 m-2]的可行性范围内能抗疲劳断裂。这个结果对延长材料的使用寿命和确保设备运行的安全稳定性具有的指导意义。
关键词:  耐火陶瓷  微裂纹  氧化  疲劳断裂
DOI:10.12044/j.issn.1007-2330.2019.01.005
分类号:
基金项目:国家自然科学基金51509254;海军工程大学自主立项项目20160135,20161524国家自然科学基金(51509254);海军工程大学自主立项项目(20160135,20161524)
Design of Fatigue Fracture Resistance at High Temperature for Si3N4 Bonded SiC Refractory Ceramic
YUAN Hu, YANG Zichun, ZHAO Shuang, SUN Wencai
Institution of High-temperature Structural Composites for Ship,Naval University of Engineering,Wuhan 430033
Abstract:
In order to investigate the fatigue fracture resistance of Si3N4 bonded SiC refractory ceramic under the oxidation conditions at high temperature, the relationship between the strength and the size and the strength and the density of the micro-cracks were simulated by the effective field-subdomain model and the thermal-damage breaking model.The results show that the feasible scope of the size between (0 mm, 0.5 mm] and the density of the micro-cracks between (0 m-2,104 m-2] can keep the fatigue fracture resistance of these materials under the oxidation conditions at high temperature.The application is good to extend the service life of materials and ensure the safety and stability of equipment operation.
Key words:  Refractory ceramic  Micro-cracks  Oxidation  Fatigue fracture