论文部分内容阅读
采用“化学气相渗透+先驱体浸渍裂解”(CVI+PIP)混合工艺,制备了ZrC改性C/C-SiC复合材料,研究了引入ZrC对改善C/C-SiC材料烧蚀性能的影响。结果表明,氧乙炔烧蚀600s后,C/C-SiC材料表面疏松,出现了大量孔洞;而同结构C/C-ZrC-SiC材料表面相对比较致密,被白色氧化物质覆盖,相比C/C-SiC材料,烧蚀率降低了一个数量级。C/C-ZrC-SiC材料氧化后形成了ZrO2-SiO2玻璃态熔融层,由于粘度较高,提高了与基体的粘附力,抵抗了氧乙炔气流的冲刷;而且熔融层能够有效降低氧化性气氛向材料内部扩散的速率,对于抑制材料的进一步氧化烧蚀起到了积极作用。
ZrC-modified C / C-SiC composites were prepared by the combination of “CVI + PIP” and the introduction of ZrC to improve the ablation performance of C / C-SiC influences. The results show that the surface of C / C-SiC material is loosened after 600s of oxyacetylene ablation and a large number of holes appear. The surface of C / C-ZrC-SiC material is relatively dense and covered by white oxide. Compared with C / C-SiC material, the ablation rate is reduced by an order of magnitude. The oxidation of C / C-ZrC-SiC forms a ZrO2-SiO2 glassy molten layer, which improves the adhesion to the substrate due to the higher viscosity and resists the erosion of the oxyacetylene gas stream. Furthermore, the molten layer can effectively reduce the oxidation resistance The rate at which the atmosphere diffuses into the interior of the material plays a positive role in suppressing further oxidative ablation of the material.