摘要
采用包埋技术在C/C复合材料表面制备SiC-TaSi_2/MoSi_2抗氧化复合涂层,通过恒温氧化实验以及X射线衍射(XRD)分析、扫描电镜(SEM)观察及能谱(EDS)分析,研究了包埋粉料中Ta,Mo含量对复合涂层微观结构和高温抗氧化性能的影响.结果表明,Ta,Mo摩尔比为1:1时所制备的复合涂层具有相对较大的厚度和较为致密的结构,氧化过程中在该涂层表面形成致密和稳定的玻璃态SiO_2保护膜.在1500℃氧化326h和经过23次1500℃至室温间的急冷急热后,带有该涂层的C/C试样失重仅为0.97%,表明该涂层具有优异的抗氧化和抗热震性能.
A SiC-TaSi2/MoSi2 multilayer oxidation protective coating on carbon/carbon （C/C） composite was prepared by pack cementation. Effects of the contents of Ta and Mo in the secondstep pack powders on the microstructure and high temperature anti-oxidation property of the multicoating were studied by XRD, SEM, EDS and isothermal oxidation test. The results show that the multi-coating prepared at the tool ratio of 1 ： 1 of Ta and Mo has a thicker, denser structure than those at the other mole ratios of 0 ： 1, 1 ： 3, 3 ： 1, on which the stable and dense glassy SiO2 film could be formed during oxidation test. After 326 h oxidation in air at 1500 ℃ and thermal cycling between 1500 ℃ and room temperature for 23 times, the weight loss of the coated specimen was only 0.97%, implying that the multi-coating prepared at the tool ratio of 1 ： 1 of Ta and Mo has excellent oxidation protective ability and thermal shock resistance.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2008年第3期331-335,共5页
Acta Metallurgica Sinica
基金
国家重点基础研究发展计划项目资助2006CB600908~~
