【摘要】 在采用“化学气相沉积和液相浸渍有机物先驱体”混合工艺制备C/C—SiC复合材料的基础上 ,在陶瓷先驱体中分别添加B、Cr填料 ,制备多组元材料 ,并分析添加剂B、Cr对C/C—SiC复合材料性能的影响。研究结果表明 ,添加剂Cr能提高复合材料的弯曲强度约 4 0 % ,但抗氧化性能和抗烧蚀性能却有所下降 ;添加剂B不仅能提高复合材料的弯曲强度 ,且在 5 0 0℃～ 10 0 0℃范围内改善了复合材料的抗氧化性能 ,其抗烧蚀性能也明显提高。更多还原

【Abstract】 On the basis of the fabrication of carbon fiber reinforced carbon ceramic matrix composites by chemical vapor deposition (CVD) and liquid impregnation of organic precursors, micro particle additives of Boron or Chromium were added to SiC precursor polymer to produce C/C SiC composites. The mechanical, ablation protection and oxidation resistance properties of the composites were studied. The research results show the additive of chromium increased the flexure strength of the C/C SiC composites up to 124 MPa by 40%, but the oxidation resistance and the ablative resistance of composites is reduced. The additive of boron not only increased the flexure strength of the C/C SiC composites but also improved the oxidation resistance of C/C SiC composites from 500℃ to 1 000℃,compared with C/C materials,the linear ablative rate of the composites fell by 20%, the mass ablative rate fell by 40%.更多还原