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采用不同浓度热塑性酚醛树脂溶液浸渍莫来石纤维毡,经过溶胶-凝胶反应和常压干燥后,制备出酚醛浸渍陶瓷烧蚀体(PICA-X,0.45~0.50 g/cm~3),后研究了其炭化前后微观形貌、力学、隔热及抗氧化性能。结果表明:PICA-X具有莫来石纤维增强酚醛气凝胶复合结构,其弯曲强度为26.7~34.0 MPa,热导率为36~40 m W/(m·K)。经过1 000℃炭化后,C-PICA-X的弯曲强度为13.9~14.5 MPa,热导率为41~45m W/(m·K);PICA-X炭化前后均表现出较好的抗氧化性能。
After impregnation of mullite fiber mats with different concentrations of thermoplastic phenolic resin solution, phenolic-impregnated ceramic ablation body (PICA-X, 0.45 ~ 0.50 g / cm ~ 3) was prepared after sol-gel reaction and atmospheric pressure drying The microstructure, mechanical properties, heat insulation and oxidation resistance before and after carbonization were studied. The results show that PICA-X has a mullite fiber reinforced phenolic airgel composite structure with flexural strength of 26.7-34.0 MPa and thermal conductivity of 36-40 mW / (m · K). After being carbonized at 1000 ℃, the bending strength of C-PICA-X was 13.9-14.5 MPa and the thermal conductivity was 41-45 mW / (m · K). Both PICA-X exhibited good oxidation resistance before and after carbonization .