整体抗氧化C/C-ZrC-SiC复合材料的超高温烧蚀性能研究  

Ablation Performances of Multi-phased C/C-ZrC-SiC Ultra-high Temperature Composites

作　　者：武海棠[1,2] 魏玺[1] 于守泉[1] 张伟刚[1] 

机构地区：[1]中国科学院过程工程研究所,多相复杂系统国家重点实验室,北京100190 [2]中国科学院研究生院,北京100049

出　　处：《无机材料学报》2011年第8期852-856,共5页Journal of Inorganic Materials

基　　金：中国科学院知识创新工程重要方向项目(YYYJ-0808-2)~~

摘　　要：以聚合有机锆与聚碳硅烷组成的共溶前驱体为原料,采用溶液浸渍?裂解(PIP)工艺制得了2D C/C-ZrC-SiC复合材料,对复合材料的超高温烧蚀性能进行了研究.利用SEM和XRD对烧蚀后材料的微观结构和物相组成进行分析,探讨了复合材料的抗烧蚀机理.结果表明,复合材料的质量烧蚀率和线烧蚀率随着ZrC含量的增加先减小后增大.其中ZrC含量为17.45vol%的复合材料具有最优的抗烧蚀性能,即在表面温度为2200℃,等离子焰烧蚀300s后,其质量烧蚀率仅为1.77mg/s,线烧蚀率为0.55μm/s.研究发现,材料表层的ZrC氧化生成的ZrO2溶于SiC氧化生成的SiO2中,形成粘稠的二元玻璃态混合物,有效阻止氧化性气氛进入基体内部,对抗超高温烧蚀起到协同作用.The 2D C/C-ZrC-SiC composites were prepared through precursor infiltration and pyrolysis（PIP） process using a hybrid precursor contained polycarbosilane and organic zirconium-contained polymeric precur-sor.The microstructures and ablation behaviors of the prepared composites were studied.The composition and microstructure of the ablated samples were characterized by XRD and SEM,respectively.The results show that the mass ablation rate and linear ablation rate of the composites generally firstly decrease and then increase with the increasing of ZrC contents.The sample with 17.45vol% ZrC has optimum anti-ablation property.After abla-tion at 2200℃ for 300s via the plasma torch heating technique,the mass loss and linear recession rate is as low as 1.77mg/s and 0.55μm/s,respectively.It is found that during ultra-high temperature stage,the matrix of ZrC and SiC are oxidized into ZrO2 and SiO2,which form a kind of viscous binary glassy mixture.The mixture could effectively cover the ablation surface and therefore promote its anti-ablation property.

关 键 词：前驱体浸渍-裂解 C/C-ZrC-SiC复合材料 烧蚀性能 

分 类 号：TB332[一般工业技术—材料科学与工程]