SiC/Mo-Si复合涂层C/SiC复合材料的氧化性能  

Oxidation behavior of C/SiC composites with a SiC/Mo-Si multilayer coating

作　　者：闫志巧[1,2] 熊翔[2] 肖鹏[2] 陈峰[2] 刘根山[2] 黄伯云[2] 

机构地区：[1]广州有色金属研究院,广东广州510650 [2]中南大学粉末冶金国家重点实验室,湖南长沙410083

出　　处：《新型炭材料》2010年第2期124-128,共5页New Carbon Materials

基　　金：国家973计划资助项目(2006CB600908)~~

摘　　要：采用化学气相沉积法(CVD)和刷涂法在C/SiC复合材料表面制备抗氧化涂层。该涂层由致密的CVDSiC层和多孔的Mo-Si层交替组成,其结构从里到外为:CVDSiC层→Mo-Si层→CVDSiC层→Mo-Si层→CVDSiC层。涂层试样于1400℃的氧化实验和1400℃100℃的热震实验结果表明:在氧化和热震过程中,涂层均保持完整,没有出现脱落和掉块等失效现象。经1400℃、150h氧化后,涂层试样的失重率仅为0.25%,失重速率为6.61×10-6g.cm-.2h-1。在热震过程中,涂层试样基本保持氧化增重。经25次和50次热震后,涂层试样的弯曲强度保持率分别为95.73%和81.61%。SiC/Mo-Si复合涂层具有优异的抗氧化和抗热震性能,可对C/SiC复合材料提供1400℃、长时间的氧化防护。A SiC/Mo-Si multilayer coating was prepared on the surface of C/SiC composites by chemical va- por deposition （CVD） combined with slurry painting. The coating was composed of a dense CVD SiC coating alternating with a porous Mo-Si layer. From inside to outside the coating consisted of CVD SiC, Mo-Si, CVD SiC, Mo-Si and CVD SiC . The coating remained intact and no obvious failure such as destruction or spalling was found during oxidation at 1400 ℃ and thermal shock between 1400 ℃ and room temperature. The mass loss and mass loss rate of the coated sample were only 0.25% and 6.61 × 10 ^-6 g.cm^-2·h^ -1 , respectively after oxidation at 1400 ℃ for 150 h. The flexural strength retention was 95.73 % and 81.61% after 25 and 50 thermal cycles respectively and mass of the coating generally increased after oxidation. The SiC/Mo-Si multilayer coating showed excellent anti-oxidation ability and a thermal shock resistance and could effectively protect the C/SiC composites at 1400 ℃ for a long time.

关 键 词：C/SIC复合材料 化学气相沉积碳化硅 刷涂 抗氧化涂层 抗热震性能 

分 类 号：TB332[一般工业技术—材料科学与工程]