# US 12,225,836 B2 · Phase change thermal storage ceramic and preparation method thereof

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- Number: US 12,225,836 B2
- Document ID: US12225836B2
- Status: Granted
- Kind: B2
- Application number: 17/167,225
- Filed: 2021-02-04
- Published: 2021-12-09
- Granted: 2025-02-11
- Earliest claimed: 2020-06-05
- Assignees: Wuhan University of Science and Technology
- Applicants: Wuhan University of Science and Technology
- Inventors: Meijie Zhang; Cangjuan Han; Huazhi Gu; Ao Huang; Lvping Fu
- Web page: https://patentgrep.com/patent/US12225836B2

## CPC

- F28D 20/0056: {using solid heat storage material (F28D20/0052 takes precedence)}
- H10N 70/884: {based on at least one element of group IIIA, IVA or VA, e.g. elemental or compound semiconductors (compounds of sulfur, selenium or tellurium, e.g. chalcogenides H10N70/882; oxides or nitrides H10N70/883)}
- B22F 1/145: Chemical treatment, e.g. passivation or decarburisation
- B22F 3/02: Compacting only
- C09K 5/063: {Materials absorbing or liberating heat during crystallisation; Heat storage materials}
- C22C 1/05: Mixtures of metal powder with non-metallic powder (C22C1/08 takes precedence)
- C22C 29/005: {comprising a particular metallic binder}
- C22C 29/12: based on oxides
- F28D 20/023: {the latent heat storage material being enclosed in granular particles or dispersed in a porous, fibrous or cellular structure}
- F28F 21/04: of ceramic; of concrete; of natural stone
- H10N 60/0296: {Processes for depositing or forming copper oxide superconductor layers}
- H10N 70/011: {Manufacture or treatment of multistable switching devices}
- B22F 2999/00: Aspects linked to processes or compositions used in powder metallurgy
- Y02E 60/14: Thermal energy storage
- Y02P 20/10: Process efficiency
- F28D: HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT (fluid heaters having heat generating means and heat transferring means F24H; furnaces F27; details of heat-exchange apparatus of general)
- H10N: ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- B22F: WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER (making alloys by powder metallurgy C22C); APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

The disclosure relates to a phase change thermal storage ceramic having high service temperature and improved utilization rate and utilization efficiency of heat. It is prepared at a low cost with a simple, easy-to-industrially-realized method. A mixture is obtained by 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. A ceramic body is formed by press molding the mixture at 80-150 MPa. The ceramic body is cured at 25-28° C. and a relative humidity of 70-75 RH for 24-36 h, dried at 80-120° C. for 24-36 h, and held at 1,100-1,300° C. for 3-5 h to prepare the phase change thermal storage ceramic. The pretreated aluminum-silicon alloy powder is prepared by holding aluminum-silicon alloy powder in water vapor at 0.02-0.20 MPa for 0.5-3 h to impregnate in an alkaline silica sol and drying the impregnated powder.

## Claims

### Claim 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.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the fused mullite powder comprises: 68-73 wt % Al2O3 and 22-25 wt % SiO2; and the fused mullite powder has a particle size of <58 μm.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the ball clay comprises: 17-35 wt % Al2O3 and 45-74 wt % SiO2; and the ball clay has a particle size of <45 μm.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the aluminum-silicon alloy powder contains 1-44 wt % of silicon, and the aluminum-silicon alloy powder has a particle size of <74 μm.

### Claim 5 (depends on 1)

A phase change thermal storage ceramic, which is prepared by the method according to claim 1.

### Claim 6 (depends on 2)

A phase change thermal storage ceramic, which is prepared by the method according to claim 2.

### Claim 7 (depends on 3)

A phase change thermal storage ceramic, which is prepared by the method according to claim 3.

### Claim 8 (depends on 4)

A phase change thermal storage ceramic, which is prepared by the method according to claim 4.