一种新型热防护涂料研究

Study on a New Thermal Protection Coating

研究了一种用于超音速飞行器的新型热防护涂料.分析了涂层材料应具有的特性,在此基础上对作为基体的有机硅改性环氧树脂的性能进行了研究,并筛选了改进涂层材料力学性能和隔热性能的填料,最后研究了涂层材料的综合性能.研究结果表明,有机硅改性环氧树脂的拉伸强度达到9.38 MPa,断裂伸长率达到16%,热分解温在340℃～640℃;涂层材料具有良好的力学性能、热性能和烧蚀性能,其拉伸强度为7.1MPa,断裂伸长率为1.04%,附着力为498.4 N/cm2,比热容为1.627×103 J/(Kg·K),导热系数为0.146 W/m·K,隔热性能参数为0.087kg2/(m4·s),氧-乙炔烧蚀的线烧蚀率为0.194 mm/s,质量烧蚀率为0.0729g/s.

A new thermal protection coating for supersonic aircrafts was studied in this paper. The performance of the coating was determined. Then, properties of a silicone modified epoxy resin, which was used as matrix, were studied, and fillers which can improve mechanical and thermal insutation properties of the coating were selected. Finally, properties of the coating were completely studied. Results indicate that the tensile strength and elongation at break of the silicone modified epoxy resin are 9. 38MPa and 16%, and its thermal decomposition temperature is between 340℃ and 640℃. Results also indicate that mechanical, thermal and ablative properties of the coating are very good, and its tensile strength, elongation at break, adhesion, specific heat, thermal conductivity, coefficient of thermal insulation, linear ablation rate and mass ablation rate of oxyacetylene ablation are 7. 1MPa, 1.04%, 498.4N/cm^2 , 1. 627 × 10^3J/（Kg· K）, 0. 146W/（m·K）, 0. 087kg^2/（m^4 · s）, 0. 194mm/s and 0.729g/s respectively.