摘要
制备了一种具有自愈合功能的C／C复合材料抗氧化涂层，它主要由SiC和B4C、高熔点还原性氧化物等陶瓷细粉经简单工艺涂刷制成。通过动态氧气氛中的TGA试验、静态干燥空气中的氧化失重试验及扫描电镜、X射线衍射分析研究了其抗氧化和抗热震性能，试验结果显示，该涂层能承受1000℃以下40ml／min氧流量的动态氧化冲击；对应600～1000℃的静态氧化的平均氧化失重率介于10^-8～10^-6g／（cm^2·s）量级，涂层在1000℃以内的工作温度环境下具有良好的抗氧化能力；涂层试样经过10次热震循环后总的氧化失重为17．8％，在一定热循环范围内具有较好的抗热震性能；涂层试样的氧化失重率与氧化时间及热震次数具有非线性关系，表明该涂层具有自我愈合裂纹的功能。
Oxidation protective coating with self-healing function for C/C composites is prepared. It mainly consists of fine ceramic powder of SiC, B4C and high melt-point deoxide, and is brushed on C/C composites by simple art. Its oxidation resistance and thermal shock resistance are investigated by TGA tests in dynamic O2 ,oxidative mass loss tests in static and dry air,SEM and X-ray diffraction. The results show that this coating can endure high temperature erosion of 40ml/min O2 up to 1000℃. The mean oxidative mass loss of coated samples is about 10^-8 -10^-6 g/（cm^2 · s） order of magnitude from 600℃ to 1000℃. The coating has promising oxidation resistance in the working condition under 1000℃. The total mass loss of 17.8% after 10 times thermal cycles indicates this coating has good thermal shock resistance in some extent. The non-linear relation between mass loss rate and oxidation time or cycles of the coated sample is owing to the self-healing function.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2006年第F05期261-263,267,共4页
Materials Reports
基金
国家重点基础研究发展计划项目(2006CB600906)资助
关键词
C/C复合材料
自愈合涂层
抗氧化性能
抗热震性能
氧化失重率
C/C composites, self-healing coating, oxidation resistance, thermal shock resistance, oxidative mass loss rate
