关键词: 防热材料, 酚醛树脂, 增强纤维, 混织

Abstract: This article addresses the demand for the heat-resistant materials of aerocraft, the structural of mixed-weaving gradient fabric reinforced phenolic resin oblique materials were introduced. The heat-resistant material is a gradient functional material, and the function of the material gradually transform from the outer layer to the inner layer from ablation to heat insulation, achieving integration of heat insulation. The two functional layers use the same high temperature resin matrix with thereby no obvious interface. The anti-ablative layer reinforcing fiber is mainly composed of ablation resistant fiber, and the heat insulating layer reinforcing fiber is mainly composed of high temperature resistant fiber. The functional layer and gradient effects are achieved by ablative fiber-heat insulation fiber of woven faber, shaping by oblique winding. To improve the materials anti-scour performance, the ply direction of woven faber presents a certain angle with the aerocraft′s heading. The obtained materials (mounted on the tooling bottom plate) is evaluated on a high-temperature supersonic gas flow engine, which can withstand the heat flow density of 1750 ℃, 2000 kW/m² , scouring up to 40 s. The result shows that the rate is less than 40 g/100 cm² and the back temperature is below 270 ℃.

Key words: heat-resistant materials, phenolic resin, reinforcing fiber, mixed-weaving