High-temperature-resistant composite board

The high-temperature-resistant composite board comprises a refractory layer, a reinforcing layer and a metal plate layer, wherein the thickness of the metal plate layer is 0.3-0.5 mm; the refractory layer comprises 100 parts of silicone rubber, 5-10 parts of methyl silicone oil, 5-15 parts of silicon carbide, 10-25 parts of aluminum oxide, 65-85 parts of silica powder, 5-15 parts of phenyltris (methylethylketoxime) silane and 1-3 parts of tin catalyst, and the reinforcing layer is prepared by soaking high-temperature-resistant fiber gridding cloth in a high-temperature-resistant adhesive and is 1-2 mm thick. The high-temperature-resistant composite board is excellent in high-temperature resistance, the refractory layer can form a hard ceramic body under the condition of 400-500 DEG C, thehigh-temperature-resistant adhesive of the reinforcing layer can also be subjected to hardening transformation under the condition of 800-900 DEG C, the high-temperature resistance is remarkably improved to 1100-1200 DEG C, a