Thermal deformation test and surface ablative morphology analysis of silica/phenolic composites

The temperature and full-field high temperature deformation of silica/phenolic composites under unilateral thermal flux were measured accurately by non-contact high temperature deformation testing systems. The surface morphology of specimens after volume ablative experiment was analyzed. It is found that the temperature peak of thermocouple was 259℃ when the distance from the heated surface was 12.62 mm after 200 s radiation heating on the silica/phenolic composites specimen by ceramic slab under 1 000℃. It is shown that the silica/phenolic composites have good thermal protection and insulation performances. The maximum displacement along the heating direction of specimen detected by DIC method is 0.18 mm after heating 200 s, and decreases gradually along the heating direction. After the analysis of ablative surface morphology of specimens, the heating surface of specimen appears uneven ablation pits. Crystalline silicon oxide particles are adsorbed on a thin layer of silica fiber after high temperature melting of silica fiber.