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