低密度双基体烧蚀防热材料

Low Density Bi-Matrix Ablative Composites

采用硅基针刺毡作为增强体、先后浸渍无机和有机树脂基体的两次复合工艺,可制成密度<1.20g/cm3的双基体烧蚀防热材料。通过马弗炉烘烤、石英灯静态隔热、电弧风洞加热三种方式考核材料的剩余强度、抗变形能力、隔热性能和抗冲刷能力。结果表明:该材料在有氧条件下,经马弗炉1 100℃、3 000 s烘烤,剩余基体还有20wt%,材料仍具有一定强度;石英灯加热至1 200℃,总时长1 200 s的条件下,25 mm厚的试样最终背温<120℃;电弧风洞考核显示,材料抗冲刷能力强,880 s时,25 mm厚材料背温仅有71℃。

Using the processing technology of impregnating silica-based needle felt with inorganic and organic resin matrix composites successively, bi-matix ablative comoposites with density less than 1.20 g/cm3 can be ob- tained. Residual strength, non-deformability, heat insulation performance and anti-erosion properties of this bi-matrix ablative composites are assessed through three methods, including muffle furnace baking, quartz lamp static heat insula- tion and arc air tunnel heating. The results show that after muffle furnace baking at 1 100℃ for 3 000 s under aerobic conditions, the matrix remains 20% and still has sufficient strength. While quartz lamp heating for 1 200 s with 1 200℃ peak temperature, the back temperature of 25 mm thick specimens is lower than 120℃. Arc air tunnel heating results show that the bi-matrix ablative composites have outstanding anti-erosion properties and the back temperature of 25 mm thick spicemens is 71 ℃ merely.