带BSAS体系EBC的SiC/SiC复合材料在1300℃水氧耦合气氛中的损伤行为  

Damage Behavior of SiC/SiC Composites with BSAS-based EBC in Wet Oxygen Atmosphere at 1300℃

作　　者：曹鑫鑫 栾新刚[1] 王钰磊 张紫琦 李建章 成来飞[1] Cao Xinxin;Luan Xingang;Wang Yulei;Zhang Ziqi;Li Jianzhang;Cheng Laifei(Science and Technology on Thermostructural Composite Materials Laboratory,Northwestern Polytechnical University,Xi’an 710072,China;National Engineering Research Center of Ceramic Matrix Composites Manufacture Technology,Xi’an Golden Mountain Ceramic Composite Co.,Ltd.,Xi’an 710118,China)

机构地区：[1]西北工业大学超高温结构复合材料重点实验室,陕西西安710072 [2]西安鑫垚陶瓷复合材料股份有限公司陶瓷基复合材料制造技术国家工程研究中心,陕西西安710118

出　　处：《航空科学技术》2024年第12期67-77,共11页Aeronautical Science & Technology

基　　金：航空科学基金(2021Z057053001)。

摘　　要：为满足具有更高涡轮进口温度的新一代高性能航空发动机的长时稳定服役需求,带有环境屏障涂层(EBC)的连续SiC纤维增强增韧SiC陶瓷基(SiC/SiC)复合材料逐渐在其热端部件上得到应用。针对带有EBC的SiC/SiC复合材料在模拟燃气环境中的服役行为,本文开展了带钡锶铝硅酸盐(BSAS)体系EBC的SiC/SiC复合材料在1300℃水氧耦合环境下氧化腐蚀试验,研究其微观组织结构演变、内部缺陷特征、重量变化率及力学性能演变规律,揭示其损伤机制。EBC中的裂纹为湿氧气氛扩散提供通道,到达硅黏结层后促使其上表面出现氧化腐蚀孔洞,从而削减了EBC的屏障防护寿命。研究发现,带BSAS体系EBC的SiC/SiC复合材料在1300℃水氧耦合环境下的氧化腐蚀服从扩散控制,EBC提供了有效的屏障防护效果,保护SiC/SiC复合材料免遭严重的氧化腐蚀损伤。微观力学分析结果表明,一定时间的考核服役后,基材近表面处和中心处纤维的承载能力均有所提高,经300h氧化腐蚀考核后,EBC保护下SiC/SiC基材的力学性能表现为提高。To meet the demand for long and stable service of new-generation high-performance aero-engines with higher turbine inlet temperatures,continuous SiC fiber reinforced and toughened SiC ceramic matrix(SiC/SiC)composites with environmental barrier coatings(EBC)are gradually being applied to hot-end components.For the service behavior of SiC/SiC composites with EBC in simulated gas environments,the oxidation and corrosion experiment of SiC/SiC composites with BSAS-based EBC in wet oxygen atmosphere at 1300℃was carried out in this paper.The microstructure evolution,internal defects characteristic,weight change rate and mechanical properties evolution law were studied to reveal its damage mechanism.Cracks in the EBC acted as channels for wet oxygen atmosphere diffusion into the internal part,which reached the Si bonding layer and prompted corrosion pores to appear on its upper surface,thus cutting down the barrier protection life of the EBC.It was found that the oxidation of SiC/SiC composites with barium strontium aluminosilicate(BSAS)EBC in wet oxygen atmosphere at 1300℃obeyed diffusion control.SiC/SiC composites under the protection of the EBC did not suffer from significant oxidation and corrosion damage.The load-bearing capacity of SiC fibers at the near surface and the center of the SiC/SiC substrate was increased after a certain time of assessment service according to the result of micromechanical analysis.Therefore,the mechanical properties of SiC/SiC substrates protected by EBC were improved after 300h of oxidation and corrosion.

关 键 词：SIC/SIC复合材料 环境屏障涂层 水氧耦合环境 氧化腐蚀损伤 力学性能 

分 类 号：V257[一般工业技术—材料科学与工程]