Phase-change heat-storage large capsule with metal core material coated with ceramic shell and preparation method of phase-change heat-storage large capsule

A metal core material and phase change heat storage technology, applied in the field of phase change energy storage, can solve the problems of inability to be recycled, large volume change rate, shell membrane bursting, etc., and achieve easy large-scale and continuous production, storage The effect of high heat density and low vapor pressure

Pending Publication Date: 2020-12-22
CHINA UNIV OF MINING & TECH
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  • Description
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  • Application Information

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Problems solved by technology

However, due to the large volume change rate of metal materials during high-temperature phase transition, for example, if the metal aluminum ball is packaged at room temperature, the metal aluminum ball will produce a large volume expansion during high-temperature phase transition, which will cause the shell membrane to burst and leak. for recycling, which becomes a major issue for packaging metal materials

Method used

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  • Phase-change heat-storage large capsule with metal core material coated with ceramic shell and preparation method of phase-change heat-storage large capsule
  • Phase-change heat-storage large capsule with metal core material coated with ceramic shell and preparation method of phase-change heat-storage large capsule
  • Phase-change heat-storage large capsule with metal core material coated with ceramic shell and preparation method of phase-change heat-storage large capsule

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: Preparation of alumina ceramic shell-coated spherical Al-Si metal core macrocapsules

[0030] (1) With the Al-Si alloy metal powder with a particle size of 50 μm as the metal core raw material, the CMC binder is dissolved in deionized water (the quality of the CMC binder is 0.16g, and the quality of deionized water is 4g). Add 10g of Al-Si alloy metal powder into the above-mentioned binder solution, stir and mix, and after mixing evenly, manually form into balls to form spherical metal Al-Si green bodies with diameters of 1mm, 2mm, 3mm, 4mm, 6mm, and 8mm, and then Dry at 40 degrees Celsius for 72 hours to make a spherical Al-Si metal core material, as shown in figure 2 (a) shown.

[0031] (2) Al with a particle size of 20nm 2 o 3 For the ceramic powder raw material, the CMC binder is also dissolved in deionized water (the quality of the CMC binder is 0.16g, and the quality of deionized water is 4g), and then 1.5g Al 2 o 3 Add ceramic powder to the above...

Embodiment 2

[0034] Example 2: Preparation of spherical Al metal core macrocapsules coated with magnesium oxide ceramic shell

[0035] (1) Using Al metal powder with a particle size of 500 μm as the metal core material, dissolve the CMC binder in deionized water (the quality of the CMC binder is 0.16g, and the quality of deionized water is 4g), and take 10g of Al metal powder, add it to the above binder solution, stir and mix, and after mixing evenly, make spherical metal Al blanks with diameters of 10mm, 15mm, 20mm, 25mm, and 30mm respectively through spherical molds, and then dry them at 150 degrees Celsius for 1 hour to make them into spherical shapes. Al metal core material.

[0036] (2) Using MgO with a particle size of 5 μm as the ceramic powder raw material, the CMC binder is also dissolved in deionized water (the quality of the CMC binder is 0.16g, and the quality of deionized water is 4g), and then 1.5g of MgO ceramics is taken Add the powder into the above binder solution and st...

Embodiment 3

[0038] Example 3: Preparation of large spherical Al-Si-Cu metal core capsules coated with silicon nitride ceramic shells

[0039] (1) With the Al-Si-Cu metal powder with a particle size of 1 μm as the metal core material, the polyvinyl alcohol binder was dissolved in deionized water (the mass fraction of polyvinyl alcohol was 10%), and the Al-Si -Cu metal powder is added to the above binder solution and stirred and mixed (the mass ratio of metal powder to binder is 80:20), and after mixing evenly, spherical metal Al with diameters of 8mm, 12mm and 16mm are made respectively by a ball forming machine - Si-Cu body, and then dried at 70 degrees Celsius for 24 hours to make a spherical Al-Si-Cu metal core material.

[0040] (2) Be that the silicon nitride micropowder of 13 μm is the ceramic powder raw material with the particle diameter, the same polyvinyl alcohol binder is dissolved in deionized water (the mass fraction of polyvinyl alcohol is 20%), and the silicon nitride microp...

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Abstract

The invention discloses a phase-change heat-storage large capsule with a metal core material coated with a ceramic shell and a preparation method of the phase-change heat-storage large capsule. The preparation method comprises the following steps: preparing a spherical metal core material from a metal powder raw material, then evenly coating the surface of the spherical metal core material with alayer of ceramic slurry, conducing forming and drying to obtain the large capsule with the metal core material coated with the ceramic shell, and finally, carrying out two-stage heat treatment consisting of low-temperature presintering and high-temperature sintering to prepare the phase-change heat-storage large capsule with the metal core material coated with the ceramic shell. The large capsuleis a spherical capsule with a diameter of 1-50 mm and structurally comprises a ceramic shell layer and a metal core, wherein the diameter of the metal core is 0.5-30 mm, and a hole is formed in the metal core layer. The spherical large capsule prepared by the method can effectively solve the problems of volume expansion of metal at high temperature and liquid phase leakage at high temperature; andthe preparation method is simple in process, friendly to environment and suitable for industrial batch production.

Description

technical field [0001] The invention belongs to the technical field of phase change energy storage, and relates to a large phase change heat storage capsule, in particular to a large phase change heat storage capsule with a ceramic shell covered with a metal core material and a preparation method thereof. Background technique [0002] In the places and fields of energy applications in my country, heat energy is not only generated in the process of direct combustion of fuel, but also indirectly generated in the application of other energy sources (wind energy, solar energy, geothermal energy, etc.), most of which are produced. It will directly exchange heat with the external environment and is not effectively utilized, resulting in waste of heat energy. Therefore, it is very important to develop simple and effective heat storage technology. In recent years, new energy storage has gradually occupied an important position in my country's energy field. As one of the main energy s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06B22F1/00B22F3/00B28B19/00
CPCC09K5/063B22F3/00B28B19/00B22F1/103B22F1/10
Inventor 朱春宇盛楠郭云琪饶中浩张龙杰
Owner CHINA UNIV OF MINING & TECH
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