摘要
连续碳化硅纤维增强碳化硅复合材料(SiC/SiC)是先进航空发动机热端部件的重要候选材料。在高温燃气环境中,SiC/SiC会发生氧化腐蚀,导致材料性能迅速恶化。为了揭示国产SiC/SiC复合材料在高温燃气环境中的氧化腐蚀行为,本工作测试了SiC/SiC复合材料的1100~1300℃空气氧化性能,获得了材料的氧化动力学曲线,利用SEM,XPS和XRD分析了材料的形貌、成分和物相演变规律,以阐明其氧化行为。结果表明:SiC/SiC复合材料在1100~1300℃的氧化动力学均遵循抛物线规律;其氧化物为SiO_(2)。SiC/SiC在1100℃时仅发生轻微氧化,温度高于1200℃时复合材料的氧化程度随温度升高而加剧。在BN界面相和基体孔隙附近的氧化现象更为明显。SiC/SiC复合材料的弯曲强度随氧化程度增加而降低。
As one of important candidates for advanced aerocraft engine hot components,SiC/SiC composites would undergo oxidative and corrosive damage when subjected to high temperature combustion environment.Oxidation behavior of SiC/SiC composites at 1100-1300℃in air was investigated in the present work,to clarify the oxidative and corrosive behavior of the composites.The oxidation kinetics curves were obtained.The morphology and composition evolution of the oxidized materials were analyzed by SEM,XPS and XRD.The results show that the oxidation kinetics of SiC/SiC composites at 1100-1300℃follow the parabolic law and the oxides on the surface mainly consist of silica.Slight oxidation occurs at 1100℃.The oxidation rate increases with increasing temperature.The oxidation process is mainly concentrated in the BN interface phase and the pores of the matrix.The bending strength of the composite decreases with the oxidation extent.
作者
洪智亮
张巧君
李开元
郭洪宝
张程煜
刘永胜
HONG Zhi-liang;ZHANG Qiao-jun;LI Kai-yuan;GUO Hong-bao;ZHANG Cheng-yu;LIU Yong-sheng(AECC Commercial Aircraft Engine Co.,Ltd.,Shanghai 200241,China;Xi'an Aviation Brake Technology Co.,Ltd.,Xingping 713106,Shaanxi,China;Science and Technology on Thermosturctural Composite MaterialsLaboratory,Northwestern Polytechnical University,Xi'an 710072,China)
出处
《材料工程》
EI
CAS
CSCD
北大核心
2021年第5期144-150,共7页
Journal of Materials Engineering
基金
上海市科学技术委员会科研计划项目(15DZ1161100)
国防基础科研计划(JCKYS2019607003)
国家重点研发计划(2016YFB1102502)。
