摘要
将SiC纤维毡与C纤维毡交替层叠,通过针刺工艺制备(C-SiC)_f/C预制体,采用化学气相渗透与前驱体浸渍裂解复合工艺(CVI+PIP)制备(C-SiC)_f/C复合材料,研究(C-SiC)_f/C复合材料H_2-O_2焰烧蚀性能。利用SEM、EDS和XRD对烧蚀前后材料的微观结构和物相组成进行分析,探讨材料抗烧蚀机理。结果表明:(C-SiC)_f/C复合材料表现出更优异的耐烧蚀性能。烧蚀750 s后,(C-SiC)_f/C复合材料的线烧蚀率为1.88mm/s,质量烧蚀率为2.16 mg/s。与C/C复合材料相比,其线烧蚀率降低了64.5%,质量烧蚀率降低了73.5%;SiC纤维毡在烧蚀中心区表面形成的网络状保护膜可以有效抵御高温热流对材料的破坏;在烧蚀过渡区和烧蚀边缘区形成的熔融Si O2能够弥合材料的裂纹、孔洞等缺陷,阻挡氧化性气氛进入材料内部,使材料表现出优异的抗烧蚀性能。
（C-SiC）_f/C preform was prepared by needle-punching technology, which SiC fiber felts andC fiber felts were laminated alternately. Then（C-SiC）_f/C preform was densified by chemical vapor infiltration and impregnation with resin to prepare（C-SiC）_f/C composites. H_2-O_2 flame ablation behavior of（C-SiC）_f/C composites was investigated. Phase composition and microstructure of the（C-SiC）_f/C composites before and after ablation were characterized by XRD, SEM and EDS, respectively. The results indicate that（C-SiC）_f/C composites exhibit excellent anti-ablation resistance. After ablation for 750 s by H_2-O_2 flame, linear ablation and mass ablation rates of（C-SiC）_f/C composites are as low as 1.88 mm/s and 2.16 mg/s, respectively.Compared withC/C composites, linear ablation and mass ablation rates of（C-SiC）_f/C composites decrease by 64.5% and 73.5%, respectively. It is found that in the high temperature ablation process, the networking-shaped protective film formed by SiC fiber felts on the surface of the ablation center zone effectively protects materials from high temperature thermal damage. Molten Si O2 in the ablation transitional and marginal zone can heal cracks, holes and other defects, and effectively prevent oxidizing atmosphere into the materials, leading to excellent anti-ablation performance.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2017年第11期1141-1146,共6页
Journal of Inorganic Materials
基金
国家重点研发计划政府间国际科技创新合作重点专项(2016YFE0111200)~~
