US 12,225,836 B2
Phase change thermal storage ceramic and preparation method thereof
Meijie Zhang, Wuhan (CN); Cangjuan Han, Wuhan (CN); Huazhi Gu, Wuhan (CN); Ao Huang, Wuhan (CN); and Lvping Fu, Wuhan (CN)
Assigned to Wuhan University of Science and Technology, Wuhan (CN)
Filed by Wuhan University of Science and Technology, Wuhan (CN)
Filed on Feb. 4, 2021, as Appl. No. 17/167,225.
Claims priority of application No. 202010507246.3 (CN), filed on Jun. 5, 2020.
Prior Publication US 2021/0384426 A1, Dec. 9, 2021
Int. Cl. H10N 70/00 (2023.01); H10N 60/01 (2023.01)
CPC H10N 70/884 (2023.02) [H10N 60/0296 (2023.02); H10N 70/011 (2023.02)] 8 Claims
 
1. 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.
 
5. A phase change thermal storage ceramic, which is prepared by the method according to claim 1.