C_(鳞片)-SiC-B_4C复合材料板烧蚀数值模拟

应用有限元法研究了在气动加热条件下不同含量和不同有序化程度C鳞片的C鳞片-SiC-B4C复合材料板的烧蚀行为·结果表明:环境介质温度、材料组分、相对密度以及不同有序化程度C鳞片对板状复合材料的瞬态温度场分布均有明显影响;C鳞片质量分数65%,基体中SiC和B4C的质量比约为5∶1,且C鳞片基本结构单元为有序排列时C鳞片生长连续并形成面积较大的碳层面,平行层状堆积成拱形结构时复合材料具有较强的抗氧化性,与实验结果一致

Numerical Simulation of Ablation of Cflake-SiC-B4C Composites Plate

FEM was used to study the ablation behavior of Cflake-SiC-B4C composite plate with different Cflake, contents and degrees of orderliness of Cflake, under aerodynamic heating conditions. The results showed that the transient temperature field distribution in the composite plate is affected obviously by ambient temperature, material's composition, relative density and Cflake with different degrees of orderliness. When the mass fraction of Cflake is 65% in the composite and the mass ratio of SiC to B4C is 5:1 in composite matrix, the composite offers high resistance to oxidation, if the basic structured elements of Cflake are arranged orderly and lots of Cflake grow continuously to form parallel big-area C layers which are piled up to form arched structure of the composite. At that time, the composite offers high resistance to oxidation, just like the testing results.