▎ 摘　　要

NOVELTY - Preparing alumina fiber reinforced thermal insulation complex material comprises (i) preparing alumina preforms with pores according to requirements, (ii) preparing slurry of high temperature resistant coating including introducing ceramic powder, solvent, dispersant, and adhesive in ball mill tank according to proportions, ball milling, uniformly mixing, adding ammonia water to adjust pH value to 7-9, or adding acidic solution to adjust pH value to 3-5, and stirring uniformly to obtain alumina fiber high temperature resistant coating slurry, (iii) preparing high-temperature resistant coating of alumina preforms including immersing the above-mentioned alumina preforms in modifier, washing with aqueous solution of pH value 3-5 or 9-10 to obtain modified body, dipping slurry and/or coating and/or depositing on modified body, sintering at 400-1400 degrees C to obtain uniform high-temperature coating of 50-500 nm on surface of the preform fiber. USE - The method is useful for preparing alumina fiber reinforced thermal insulation complex material. ADVANTAGE - The method enables to prepare alumina fiber reinforced thermal insulation complex material, which has reasonable step design, simple and controllable process, and is convenient for industrial application of large scale. The material: simultaneously meet the requirements of high temperature resistance, erosion resistance, and thermal insulation.