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为满足喷管内型面耐烧蚀及背壁绝热的要求 ,以整体炭毡、炭纤维多维编织件等为预制体 ,先进行炭素沉积与石墨化 ,再用 Al2 O3型高温无机胶进行真空 -压力浸渍、烧结 ,制得 C/ Al2 O3功能型复合材料。对增强相炭纤维与陶瓷相 Al2 O3的界面结合强度、无机胶液配方改进、提高烧结温度以及用沥青浸渍 HIP等方面进行了研究。所获得的复合材料外表面导热系数 λ=0 .90 2 W/ (m·K) (80 0℃ ) ,内表面线烧蚀率为 0 .0 1 8mm/ s,电镜照片显示 C/ Al2 O3的界面结合良好。
In order to meet the ablation resistance of the inner surface of the nozzle and the requirement of the back wall thermal insulation, carbon charcoal deposition and graphitization were carried out by using the whole carbon felt and the carbon fiber multi-dimensional braid as the preform, and then the high temperature inorganic glue Al2 O3 was used for vacuum- Pressure impregnation, sintering, prepared C / Al2 O3 functional composite. The interfacial bonding strength of Al 2 O 3 with carbon fiber and ceramic phase, the improvement of inorganic gel formulation, the increase of sintering temperature and the impregnation of HIP with pitch were studied. The thermal conductivity of the composite obtained on the outer surface was λ = 0.90 2 W / (m · K) (80 0 ℃) and the ablation rate of the inner surface was 0.018 mm / s. The electron microscopy images showed that the C / Al 2 O 3 The interface is well integrated.