航空科学技术2024，Vol.35Issue(12)：67-77,11.DOI:10.19452/j.issn1007-5453.2024.12.009
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℃
摘要
Abstract
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Key words
SiC/SiC composites/EBC/wet oxygen atmosphere/oxidation and corrosion damage/mechanical properties分类
航空航天引用本文复制引用
曹鑫鑫,栾新刚,王钰磊,张紫琦,李建章,成来飞..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[J].航空科学技术,2024,35(12):67-77,11.基金项目
航空科学基金(2021Z057053001) Aeronautical Science Foundation of China(2021Z057053001) （2021Z057053001）
