Silicone rubber composites with anti-ablation and thermal insulation properties were pre-pared with hot vulcanized silicone rubber as matrix,and polyarylacetylene,short carbon fiber,zirconia and carbon fiber cloth as anti-ablation fillers,and the effect of anti-ablation fillers on linear ablation rate and substrate temperature of the composites was in-vestigated.The results showed that the linear abla-tion rate and substrate temperature of the composites were decreased with the sequential addition of the anti-ablation fillers.When the addition amount of polyarylacetylene,short carbon fiber,zirconia,and carbon fiber cloth were all 10 phr(mass),the resul-ting composite had the best anti-ablation and thermal insulation properties with a linear ablation rate of 0.043 mm/s and a substrate temperature of 70℃.This was mainly attributed to the ceramization-car-bonization coupling reaction between the anti-abla-tion fillers and silicone rubber matrix,which led to the formation of a dense ablation layer that covered the surface of carbon fiber cloth.
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