Phase change thermal storage ceramic and preparation method thereof

A method for preparing a phase change thermal storage ceramic, the method comprising:

• mixing and stirring evenly 50-85 wt % of fused mullite powder, 10-45 wt % of pretreated aluminum-silicon alloy powder, and 3-8 wt % of ball clay to obtain a mixture;
• press molding the mixture at 80-150 MPa to obtain a ceramic body;
• and
• preparing the phase change thermal storage ceramic by curing the ceramic body at a temperature of 25-28° C. and a relative humidity of 70-75 RH for 24-36 h, drying the ceramic body at 80-120° C. for 24-36 h, and holding the ceramic body at 1,100-1,300° C. for 3-5 h;
• wherein the pretreated aluminum-silicon alloy powder is prepared by a method comprising:
• placing aluminum-silicon alloy powder in an autoclave and holding the powder in water vapor at a pressure of 0.02-0.20 MPa for 0.5-3 h to obtain an aluminum-silicon alloy powder corroded by water vapor;
• placing the aluminum-silicon alloy powder corroded by water vapor in an alkaline silica sol having a pH of 8-12 and containing nanoparticles with a particle size of 10-20 nm, holding for 10-30 h, and filtering to obtain an impregnated aluminum-silicon alloy powder;
• and
• placing the impregnated aluminum-silicon alloy powder in an oven at 50-110° C. and drying the powder for 12-24 h to obtain the pretreated aluminum-silicon alloy powder.