High-temperature high-emissivity energy-saving materials were prepared using Fe2O3, Cr2O3, MnO2, CuO, SiO2 and Al2O3 powders as raw materials via a high temperature solid phase sintering at 1200 ℃ and a sequnce mixture with binder for ball milling. The microstructure and physicochemical properties of the material were characterized by scanning electron microscope(SEM) and infrared radiation measuring instrument. Results indicated that the emissivity of the prepared coating sample gradually increased with the increase of measuring temperature at 400~700 ℃, 2~14 μm band. When the measuring
temperature is 700 ℃, the highest emissivity of the sample is 0. 94. The thermal shock resistance of the coating was tested using the thermal shock method, and the results showed that the coating was heated to 1000 ℃ for water-cooling to deheat and cooling for 50 cycles, and no coating peeling was found, which indicated that the thermal shock resistance of the coating is good. In addition, the results of industrial tests on 20T (SZS20-1. 25-Q) gas-fired boilers showed that the exhaust gas temperature of the boiler can be reduced, and the boiler efficiency can be improved after spraying high-temperature and high-emissivity energy-saving materials on the outer surface of water wall of a gas boiler. Compared with unpainted boilers, the efficiency of sprayed boilers was increased by 3. 42%, which showed that this material has a significant energy-saving effect.