Cansas-ⅡSiC_(f)/SiC复合材料的高温拉伸蠕变行为  

Tensile Creep Behavior of Cansas-Ⅱ SiC_(f)/SiC Composites at High Temperatures

作　　者：荆开开 管皞阳 朱思雨 张超[1,2] 刘永胜[1,3] 王波[2,4] 王晶[1,3] 李玫[1] 张程煜[1,2] JING Kaikai;GUAN Haoyang;ZHU Siyu;ZHANG Chao;LIU Yongsheng;WANG Bo;WANG Jing;LI Mei;ZHANG Chengyu(NPU-SAS Joint Research Center,School of Materials,Northwestern Polytechnical University,Xi’an 710072,China;Institute of Extreme Mechanics,Northwestern Polytechnical University,Xi’an 710072,China;Key Laboratory of Ultra-High Temperature Structural Composites,Northwestern Polytechnical University,Xi’an 710072,China;School of Aeronautics,Northwestern Polytechnical University,Xi’an 710072,China)

机构地区：[1]西北工业大学材料学院NPU-SAS联合研究中心,西安710072 [2]西北工业大学极端力学研究院,西安710072 [3]西北工业大学超高温结构复合材料重点实验室,西安710072 [4]西北工业大学航空学院,西安710072

出　　处：《无机材料学报》2023年第2期177-183,共7页Journal of Inorganic Materials

基　　金：国家自然科学基金(U2241239,51572224,12102336);高等学校学科创新引智计划(BP0820014);陕西省科技重点项目(2017KW-019)。

摘　　要：连续碳化硅纤维增强碳化硅复合材料(SiC_(f)/SiC)是发展先进航空发动机的关键材料,航空发动机长时服役要求材料具有优异的高温蠕变性能。本工作研究了平纹编织Cansas-Ⅱ碳化硅纤维增强碳化硅复合材料(2D-SiC_(f)/SiC)在空气中的高温蠕变行为,蠕变温度为1200~1400℃,应力水平为80~140 MPa。利用扫描电子显微镜(SEM)观察了2D-SiC_(f)/SiC复合材料的微观组织和断口形貌,使用能谱分析仪(EDS)进行了成分分析。结果表明:当蠕变应力低于比例极限应力(σPLS)时,2D-SiC_(f)/SiC的蠕变断裂时间超过500 h,稳态蠕变速率为1×10^(–10)~5×10^(–10)/s,蠕变行为由基体和纤维共同控制。当蠕变应力高于σPLS时,复合材料的基体、纤维和界面均发生氧化,蠕变断裂时间显著降低,稳态蠕变速率提高一个数量级,蠕变行为主要由纤维控制。Continuous silicon carbide fiber reinforced silicon carbide composite(SiC_(f)/SiC)is a key material for the advanced aero-engines.It is required to possess excellent high-temperature creep resistance for SiC_(f)/SiC to meet the long-term service lifetime of the aero-engines.Here,tensile creep behaviors of a plain woven Cansas-Ⅱ SiC_(f)/SiC(2D-SiC_(f)/SiC)were investiged in the temperature of 1200–1400℃with the stress levels of 80 to 140 MPa.Its microstructure and fracture morphology were observed,and composition was analyzed.Results show that creep-rupture time of 2D-SiC_(f)/SiC is more than 500 h and steady-state creep rate is 1×10^(–10)–5×10^(–10)/s at stresses lower than the proportional limit stress(σPLS).The creep behaviors are controlled by matrix and fibers.The creep-rupture time is significantly reduced,and the steady-state creep rate is increased by an order of magnitude when the stress is higher than theσPLS.The matrix,fibers and interfaces of the composite are greatly oxidized,and the creep behaviors are mainly controlled by the fibers.

关 键 词：Cansas-ⅡSiC_(f)/SiC复合材料 蠕变 蠕变断裂时间 稳态蠕变速率 基体开裂 

分 类 号：TB332[一般工业技术—材料科学与工程]