炭/炭复合材料自愈合涂层的制备及其抗氧化性能  

Preparation and Oxidation Resistance of Self-Healing Coating for C/C Composite

作　　者：方勋华[1] 易茂中[1] 左劲旅[1] 张红波[1] 熊翔[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,湖南长沙410083

出　　处：《材料保护》2005年第11期17-20,共4页Materials Protection

摘　　要：为了拓展C/C复合材料作为高温结构材料的应用领域,作者研究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Si-B-A l-Cr-Zr系陶瓷氧化物构成。静态干燥空气中的氧化试验显示,对应700~1 000℃的平均氧化失重率约为2.91×10-7~9.43×10-6g/(cm2.s);涂层在1 000℃以内温度环境下具有良好的抗氧化能力;5~6个300~1 000℃热循环内涂层试样氧化速率下降,其后增加,6 h内经过10次300~1 000℃热循环后涂层试样氧化失重为19.64%,涂层在一定热循环范围内具有抗热震性能。SiC结合B基陶瓷为主要组分的涂层能够在较长氧化时间和一定的热震循环周期内保持涂层试样较低的氧化失重率并降低其氧化速率。For the aim of extending the application field of C/C composite as high temperature construction material,an oxidation protective coating with self-healing function for C/C composite was prepared,which mainly consisted of SiC and Si-B-Al- Cr-Zr based oxide ceramic.The mean oxidative mass loss of coated samples after isothermal tests in static and dry air from 700 ℃ to 1 000 ℃ is about 2.91×10^(-7)～(9.43)×10^(-6) g/(cm^2·s),the coating has promised oxidation resistance under the temperature of 1 000 ℃.The oxidation rate decreases within 5～6 thermal cycles between 300 ℃ and 1 000 ℃,and then increases after that,the mass loss of coated sample is 19.64% after 10 thermal cycles in 6 hours,the coating has thermal shock resistance in some extent.SiC combined B based ceramic coating can provide low mass loss and oxidation rate for coated C/C composite in long period oxidation and some thermal cycles.

关 键 词：抗氧化性能 抗热震性能 氧化失重率 C/C复合材料 自愈合涂层 

分 类 号：TB332[一般工业技术—材料科学与工程]