摘要
采用化学气相渗透(CVI-C)和液相浸渍裂解(PIP-SiC、PIP-ZrC)工艺制备了2.5D C/C-SiC-ZrC陶瓷基复合材料。通过液氧煤油超音速火焰对蘑菇头驻点试验件进行烧蚀试验,并采用扫描电子显微镜(SEM)和能谱分析仪(EDS)对材料的微观形貌及抗氧化烧蚀机理进行了初步探讨。结果表明,C/C-ZrC-SiC复合材料基体中SiC:ZrC质量比约为4:6,在2200K~2400K液氧煤油超音速火焰烧蚀试验环境下具有良好的抗烧蚀性能,100s蘑菇头驻点线烧蚀率仅为0.0054mm/s。研究发现,C/C-ZrC-SiC复合材料中合适的SiC和ZrC基体配比,高温氧化烧蚀过程中,材料表面形成了以ZrO_(2)颗粒为骨架的连续致密粘稠熔融层,有效封填材料表面的裂纹、孔洞,降低氧化性气氛向材料内部扩散的速率,对材料形成了较好的保护。
The 2.5D C/C-SiC-ZrC Ceraminc Matrix Composites were prepared by chemical vapor infiltration(CVI-C)and liquid phase impregnation pyrolysis(PIP-sic,PIP-ZRC).The ablation test of mushroom head stagnation piece was carried out by liquid oxygen kerosene supersonic flame,and the microstructure and anti-oxidation ablation mechanism of the material were studied by scanning electron microscope(SEM)and energy dispersive spectroscopy(EDS).The results show that the mass ratio of SiC:ZrC in C/C-SiC-ZrC composites is about 4:6,and it has good ablative resistance under the condition of 2200K~2400K liquid oxygen kerosene supersonic flame test.The ablation rate of 100s mushroom head is only 0.0054mm/s.It was found that suitable ratio of SiC and ZrC matrix in C/C-ZrC-SiC composite materials,the continuous dense and viscous melting layer with ZrO_(2) particles as the skeleton was formed on the surface of the material during high temperature oxidation ablation,The cracks and holes on the surface of the material are effectively filled,and the diffusion rate of oxidizing atmosphere to the material is reduced,which forms a good protection for the material.
作者
杨柳
石林
杨云鹏
YANG Liu;SHI Ling;YANG Yun-peng(Resesarch Institute Xi'an Aerospace Composites Materials.Xi'an 710025,China)
出处
《炭素》
2022年第1期9-13,共5页
Carbon
