The invention relates to a high-temperature phase-change heat storage
composite material and a preparation method thereof. According to the technical scheme, the method comprises the steps that ternary aluminum-based
alloy powder is alternately washed with an acid solution and deionized water, dried in a protective
atmosphere and placed in pressurized steam to be pretreated, and the pretreated ternary aluminum-based
alloy powder is obtained; the pretreated ternary aluminum-based
alloy powder is put into aluminum
sol for vacuum impregnation, taken out, filtered, put into silica
sol for vacuum impregnation, filtered, and taken out; the steps are repeated for 3-5 times according to an alternate impregnation method, and filtering and
drying are performed to obtain the pre-coated ternary aluminum-based alloy powder; and the pre-coated ternary aluminum-based alloy powder is put into a high-temperature furnace, fired at 1100-1400 DEG C under an
air atmosphere condition, and cooled to obtain the high-temperature phase-change heat storage
composite material. The preparation method is simple in process, low in cost and easy for industrial production, and the prepared high-temperature phase-change heat storage
composite material is high in shell strength, high in phase-
change temperature, high in heat storage density, high in heat
utilization rate and high in utilization efficiency, and is suitable for
solar power generation, high-temperature industry and the like.