【摘要】 采用含1μmTaC微粉4%(体积分数)的料浆向10mm厚的3D碳纤维预制体中引入TaC,得到微粉含量高、中、低的三种预制体,CVI沉积SiC致密化后制得3DC/SiC-TaC多元基复合材料。氧-乙炔烧蚀试验后采用XRD和SEM对烧蚀产物和显微结构进行分析。结果表明:料浆法结合CVI可制备出C/SiC-TaC复合材料,高含量的TaC微粉烧蚀后形成的TaC和Ta2O5的固液混合物,能对烧蚀面进行有效包覆,有助于提高烧蚀性能。更多还原

【Abstract】 Using a kind of slurry which contains 1μm TaC fillers 4%(volume fraction) to introduce TaC fillers into 10mm thick 3D carbon fiber perform,three kind of TaC content(low,medium,high) preforms were obtained.3D C/SiC-TaC composites were prepared after densification using CVI SiC.The resultant and microstructure were studied using XRD and SEM after oxygen-acetylene flame test.The results showed that this joint method could prepare C/SiC-TaC composites,the high content TaC fillers were oxided into TaC and Ta2O5 which were a solid and liquid mixture,this mixture could effectively cover the ablation surface and promote anti-ablation poperty.更多还原