C/C复合材料SiC-SiO_2/ZrO_2-SiC复合抗氧化涂层  

Preparation and performance of SiC-SiO_2/ZrO_2-SiC multilayer on carbon/carbon composites

作　　者：姜林[1] 迟伟东[1] 刘辉[1] 刘禺 于建民[1] 

机构地区：[1]北京化工大学材料科学与工程学院教育部碳纤维及功能高分子重点实验室,北京100029

出　　处：《炭素技术》2014年第5期39-42,共4页Carbon Techniques

摘　　要：为了提高C/C复合材料在高温有氧环境的抗氧化性,在SiC抗氧化涂层防护的基础上,采用气相沉积法及溶胶凝胶吸附冷凝热蒸汽法在C/C复合材料表面制备出了SiC-SiO2/ZrO2-SiC复合涂层。利用扫描电镜、能谱质谱测试及X射线衍射等检测方法对涂层各层进行了分析。结果表明,溶胶吸附ZrCl4蒸汽法制备ZrO2涂层,不仅能够在高温自动修复单层SiC涂层的裂纹缺陷,还起到了在制备外层SiC涂层过程中缓冲应力的作用。这种多层复合涂层在高温下具有良好的抗氧化性,在1 800℃等离子焰动态空气氧化120 s后,计算得出该涂层失重速率仅为0.4 g/(m2·s),表明该涂层具有卓越的抗氧化性。In order to improve the anti-oxidation property of carbon/carbon composites at high temperature, CVD and sol-gel absorption methods were used to prepare a SiC-SiO2/ZrO2-SiC muhilayer on C/C composites. Scanning electron microscopy （SEM）, Energy Dispemive X-ray Spectroscopy（EDS） and X-ray diffraction （XRD） were applied to analyze the surface of each layer. The results show that intermediate layer prepared by sol-gel absorption process exhibits self-healing function, which could fill the crack and buffer stress of the SiC coating at high temperature. The mass ablation rate of C/C composites with this layer is only 4 g/（m^2·s） at 1 800 ℃ after 120 s adsorption. The multilayer shows outstanding erosion resistance.

关 键 词：C/C复合材料 抗氧化 复合涂层 

分 类 号：TB322[一般工业技术—材料科学与工程]