Provided is an
ablation-resistant lightweight integrated
composite material with a
thermal insulation function. The
composite material is of a sandwich structure, the middle layer adopts a chopped
fiber as a reinforcing body, phenolic resin as a substrate and hollow microbeads as
thermal insulation fillers, upper and lower surface
layers are bonded to each other by a
fiber cloth pre-impregnation material, and the three
layers are cured to improve the
bearing capacity and the anti-scouring capacity. The preparation method of the
composite material comprises eight steps including
ceramic powdertreatment, pretreatment of the chopped
fiber and a fiber cloth, mixing,
drying,
slurry preparation, brushing or impregnation,
mold filling, curing formation and demolding. The composite material can be applied to the
ablation working condition of medium and low
heat flux density; the composite material is formed at one time, so that the preparation cycle is short, and the cost is low; a stable
ablation-resistant
ceramic layer can be formed on the surface in a temperature range from 800 DEG C to 1,300 DEG C, and meanwhile, low-density fillers such as the hollow microspheres achieve a
thermal insulation function. In this way, the integrated thermal insulation function under the conditions of medium and low
heat flux density and oxidation is achieved.