摘要
采用聚碳硅烷和有机锆聚合物混合前驱体,通过反复浸渍裂解工艺制备了C/C-ZrC-SiC复合材料,分析了材料的组成与结构,研究了不同陶瓷前驱体配比对材料烧蚀性能的影响。结果表明,复相陶瓷基体由大量ZrC颗粒均匀弥散分布在连续SiC相中组成。随着ZrC含量的增加,C/C-ZrC-SiC复合材料的烧蚀率呈现先减小后增大的趋势。当聚碳硅烷与有机锆聚合物的配比(质量比)为1∶3时,ZrC体积含量约为13.3%,氧乙炔烧蚀600s后,C/C-ZrC-SiC复合材料的线烧蚀率和质量烧蚀率降至最低,分别为-0.0015mm/s和0.0002g/s。研究发现,高温氧化环境中,形成了粘稠的ZrO2-SiO2玻璃态氧化膜,有效降低了氧化性气氛向材料内部扩散的速率,对材料基体形成了较好的保护。
The C/C-ZrC-SiC composites were produced through precursor infiltration and pyrolysis（PIP）process using a hybrid precursor containing polycarbosilane and organic zirconium-contained polymer.The composition and microstructure of the novel ceramic composites were analyzed and the effects of ceramic precursor ratio on ablation properties of the C/C-ZrC-SiC composites were investigated.The results show that the multiphase ceramic matrix is composed of abundant ZrC particles which are distributed in the continuous SiC phase uniformly.The ablation rates of the C/C-ZrC-SiC composites generally decrease at first,and then increase along with the rising of ZrC contents.When the mass ratio of polycarbosilane and organic zirconium-contained polymer is 1∶3,ZrC content reaches 13.3vol% approximately,and in the oxyacetylene ablation test which lasts 600 s,mass ablation rate and linear ablation rate of the C/C-ZrC-SiC composites reach their bottom values,which are-0.0015 mm/s and 0.0002g/s respectively.It is found that a viscous ZrO2-SiO2 glassy oxide membrane is formed in the high temperature oxidizing atmosphere,which could effectively reduce diffusion velocity of oxidizing gas,and protect the composites from being oxidized.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2015年第2期52-56,共5页
Materials Reports
基金
预研基金(9140A12030212HT43133)
