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采用“化学气相渗透+先驱体浸渍裂解”(CVI+PIP)混合工艺制备固体冲压发动机用C/C-SiC复合材料喷管内层,综合考查复合材料的微观结构、弯曲性能和抗烧蚀性能以及固冲发动机C/C-SiC喷管内层水压和点火实验。结果表明:复合材料的弯曲强度达到197 MPa,且断裂破坏行为呈现典型的韧性模式;复合材料具有优异的抗氧化烧蚀性能,氧化烧蚀200 s后线烧蚀率仅为0.0063 mm·s-1;研制的C/C-SiC复合材料构件的水压爆破压强为6.5 MPa,表明构件具有良好的整体承载能力;C/C-SiC复合材料喷管内层高温综合性能通过了固体冲压发动机点火实验考核。
The inner layer of C / C-SiC composite nozzle for solid punching engine was prepared by the combination of chemical vapor infiltration and precursor impregnation and cracking (CVI + PIP). The microstructure, flexural properties and ablation resistance Performance and solid-jet engine C / C-SiC nozzle inner pressure and ignition experiments. The results show that the flexural strength of the composites reaches 197 MPa and the fracture toughness shows a typical ductile mode. The composite has excellent anti-oxidant ablation performance. The post-oxidation ablation rate of the composites is only 0.0063 mm · s- 1. The hydraulic burst pressure of the C / C-SiC composites was 6.5 MPa, which indicates that the component has a good overall bearing capacity. The high-temperature composite performance of C / C-SiC composite nozzle passes the solid state ramjet ignition experiment Assessment.