高温燃气环境下SiCf/SiC和SiC_(f)/SiC-EBC复合材料力学性能及损伤  

Mechanical properties and damage analysis of SiC_(f)/SiC and SiC_(f)/SiC-EBC composites in high-temperature combustion gas environment

作　　者：王子媛 曹鑫鑫 蒋婷 洪智亮 张程煜[4] 朱旺 WANG Ziyuan;CAO Xinxin;JIANG Ting;HONG Zhiliang;ZHANG Chengyu;ZHU Wang(AECC Commercial Aircraft Engine Co.,Ltd.,Shanghai 200241,China;Shanghai Center of Research for Commercial Aircraft Engine Engineering Technology,Shanghai 200241,China;Institute of Materials,Shanghai University,Shanghai 200072,China;Science and Technology on Thermosturctural Composite Materials Laboratory,School of Materials Science and Engineering,Northwestern Polytechnical University,Xi’an 710072,China;Key Laboratory of Key Film Materials&Application for Equipment,School of Materials Science and Engineering,Xiangtan University,Xiangtan 411105,Hunan,China)

机构地区：[1]中国航发商用航空发动机有限责任公司,上海200241 [2]上海商用飞机发动机工程技术研究中心,上海200241 [3]上海大学材料所,上海200072 [4]西北工业大学材料科学与工程学院超高温结构复合材料重点实验室,西安710072 [5]湘潭大学材料科学与工程学院薄膜材料与设备应用重点实验室,湖南湘潭411105

出　　处：《航空材料学报》2024年第4期46-56,共11页Journal of Aeronautical Materials

基　　金：国家重点研发计划(2022YFB3707705);上海市科学技术委员会科技创新计划(21511104802)。

摘　　要：航空发动机中的碳化硅纤维增强碳化硅陶瓷基复合材料(SiC_(f)/SiC)因承受高温高速燃烧气体的氧化腐蚀而发生损伤甚至失效。本工作利用燃气发生装置模拟航空发动机中复杂燃气环境,将以一定比例混合后的航空煤油与液氧燃料点燃,形成高温高速燃烧气体对材料进行考核。对SiC_(f)/SiC复合材料分别进行1200℃燃气环境10 h氧化实验和1000次热冲击实验,探究环境屏障涂层(environmental barrier coating,EBC)对SiC_(f)/SiC复合材料的防护作用。对燃气环境考核后的SiC_(f)/SiC复合材料和SiC_(f)/SiC-EBC复合材料进行单轴拉伸强度测试,并利用扫描电镜对其断口及截面微观形貌进行观察。结果表明:在燃气环境下氧化10 h后,SiC_(f)/SiC复合材料和SiC_(f)/SiC-EBC复合材料内部没有发生明显的界面层及纤维氧化,单轴拉伸强度下降不到2%;在燃气环境下经过1000次热冲击后,在SiC_(f)/SiC复合材料内部形成多处微裂纹并发生了界面层的氧化腐蚀,单轴拉伸强度下降41.3%;EBC涂层可以有效保护SiC_(f)/SiC复合材料免受高温燃气的氧化腐蚀,SiC_(f)/SiC-EBC复合材料在经过1000次热冲击后的单轴拉伸强度下降16.6%。Silicon carbide fiber-reinforced silicon carbide ceramic matrix composites(SiC_(f)/SiC)used in aero-engines are damaged or even failed due to the oxidation and corrosion by high-temperature and high-speed combustion gases.In this work,the gas generation device was used to simulate the complex gas environment in the aircraft engine,and the aviation kerosene mixed with liquid oxygen fuel in a certain proportion was ignited to form a high-temperature and high-speed combustion gas to assess the material.The oxidation test for 10 h and thermal shock test for 1000 cycles in combustion gas environment at 1200℃were conducted on SiC_(f)/SiC composites respectively.And the protective effect of environmental barrier coating(EBC)on SiC_(f)/SiC composites was investigated.Uniaxial tensile tests were conducted on SiC_(f)/SiC composites and SiC_(f)/SiC-EBC composites after combustion gas environment assessment,and their fracture and cross-section micro-morphologies were observed by scanning electron microscopy.The results show that no significant oxidation of fibers and interphases is found in SiC_(f)/SiC composites and SiC_(f)/SiC-EBC composites after oxidation for 10 h in combustion gas environment,and their uniaxial tensile strength decreases by less than 2%.After 1000 thermal shock cycles in combustion gas environment,multiple micro-cracks are formed and oxidative corrosion of the interfacial layer occurs inside the SiC_(f)/SiC composites,and the uniaxial tensile strength decreases by 41.3%.The EBC coating can effectively protect the SiC_(f)/SiC composites from oxidation and corrosion of high-temperature gas,and the uniaxial tensile strength of SiC_(f)/SiC-EBC composites decreases by 16.6%after 1000 thermal shock cycles.

关 键 词：航空发动机 SiC_(f)/SiC复合材料 环境屏障涂层 高温燃气 剩余强度 

分 类 号：V257[一般工业技术—材料科学与工程]