▎ 摘　　要

NOVELTY - Preparing a large metal-based phase change heat storage capsule comprises (i) stirring and mixing the metal oxide powder and carbon powder, stirring and mixing with the organic agglomerant solution, adopting the powder pressing method, drying and using the dried spherical composite material as the core; (ii) stirring and mixing the ceramic powder and sintering auxiliary agent to obtain the composite material powder, stirring and mixing the composite material powder with the organic agglomerant solution, mixing uniformly to obtain the ceramic slurry doped with sintering auxiliary agent, coating on the spherical core, pressing and drying to obtain the capsule blank; (iii) placing the capsule blank successively in an oxygen-containing atmosphere and a non-oxygen atmosphere to carry out the following two sections of heat treatment. USE - The method is useful for preparing a large metal-based phase change heat storage capsule. ADVANTAGE - The method preparation process is simple, environmentally-friendly and easy for industrialized production. DETAILED DESCRIPTION - Preparing a large metal-based phase change heat storage capsule comprises (i) stirring and mixing the metal oxide powder and carbon powder according to the preset ratio to obtain the composite material powder, stirring and mixing the composite material powder and the organic agglomerant solution in a certain proportion, adopting the powder pressing method to form, drying at 40-100℃ for 6-24 hours, and using the dried spherical composite material as the core; (ii) stirring and mixing the ceramic powder and sintering auxiliary agent according to the preset proportion, mixing uniformly to obtain the composite material powder, stirring and mixing the composite material powder with the organic agglomerant solution according to the preset proportion, mixing uniformly to obtain the ceramic slurry doped with sintering auxiliary agent, coating on the spherical core, pressing and drying at 40-100℃ for 6-24 hours to obtain the capsule blank; (iii) placing the capsule blank successively in an oxygen-containing atmosphere and a non-oxygen atmosphere to carry out the following two sections of heat treatment (1) pre-sintering at 200-400℃ for 0.5-12 hours in an oxygen-containing atmosphere to remove the organic agglomerant in the capsule blank; and (2) sintering at a high temperature of 500-1800℃ for 1-12 hours in a non-oxygen atmosphere to prepare a large phase-change heat storage capsule with a ceramic shell encapsulating a metal core.