中文摘要：

采用有机锆聚合物树脂，通过先驱体浸渍裂解法（PIP）向C／C-SiC复合材料中引入ZrC或ZrB，超高温陶瓷相，研究了不同双元陶瓷基体对改性C／C复合材料的力学性能和烧蚀性能的影响。结果表明。SiC—ZrC（ZrB2）复相陶瓷呈现均匀弥散分布。与C／C—SiC-ZrC复合材料相比，C／C-SiC-ZrB2复合材料的拉伸强度、弯曲强度、剪切强度和压缩强度均有小幅提升，分别提高了30．7％、23．4％、32．4％、25％，韧性断裂特征相对比较明显。在2100K、600s电弧风洞试验条件下，C／C-SiC-ZrB2复合材料的质量烧蚀率为1．67≤10^-6g／（cm^2·s），比C／C-SiC—ZrC复合材料降低了一个数量级。C／C-SiC—ZrB2复合材料烧蚀性能提高的原因是600～1100℃时，液态B2O3起到了良好的氧化保护作用；1100-1300℃时，硼硅酸盐阻碍了材料的深层次氧化；1300℃以上时，高粘度的ZrO2-SiO2玻璃态熔融层可有效阻止氧化性气氛深入材料内部，减缓材料的氧化烧蚀。

英文摘要：

ZrC or ZrB2 ultra high temperature ceramic phase were introduced into C/C-SiC composites through precursor infiltration and pyrolysis （PIP） process using organic zirconium-contained polymer. The effects of different dual ceramic matrix on mechanical and ablation properties of modified C/C composites were investigated. The results show that the muhiphase ceramic matrix of SiC-ZrC （ZrB2 ）are distributing uniformly in the composites. The tensile strength, flexural strength, shear strength and compressive strength of C/C-SiC-ZrB2 composites are 30.7%, 23.4%, 32.4% and 25% higher than C/C-SiC-ZrC composites respectively. And C/C-SiC-ZrB2 composites exhibit toughness fracture characteristic apparently. Under arc wind tunnel test at 2 100 K for 600 s, the mass ablation rate of C/C-SiC-ZrB2 composites are 1.67× 10^-6g / （cm^2 · s） , which were degraded by one order of magnitude compared with C/C-SiC-ZrC composites respectively. The reasons for good ablation properties of C/C-SiC-ZrB2 composites are that when the temperature ranges from 600℃ to 1 100℃, liquid B203 behaves good oxidation protection property. Borosilicate hinders deep oxidation between 1 100℃ and 1 300℃. A high viscosity ZrO2-SiO2 glassy molten layer is generated on the surface of C/C- SiC-ZrB2 composites when the temperature goes above 1 300℃, which can prevent oxidizing atmosphere from entering into the composites effectively and slow down the oxidative ablation on the composites.