Composite phase-transition heat-storage material and preparation method thereof

A heat storage material and composite phase change technology, applied in the direction of heat exchange materials, chemical instruments and methods, etc., to achieve stable physical and chemical properties, good reversibility, and a wide range of phase change temperature

Inactive Publication Date: 2017-05-31
CHANGDE LYRUN MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Its application in phase change heat

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  • Composite phase-transition heat-storage material and preparation method thereof

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Embodiment 1

[0026] This embodiment provides a novel phase-change heat storage material with excellent thermal conductivity, which is composed of a porous material 1 with high thermal conductivity and a low melting point metal 2 ( figure 1 ), the porous material 1 is used as a supporting skeleton, and is embedded in the working container 3 by extrusion, and the working container 3 is a working container filled with the composite phase change heat storage material.

[0027] An interference fit is adopted between the porous material and the inner wall surface, the outer diameter of the porous material is 0.6-0.8 mm greater than the inner diameter of the working container, and the low melting point metal 2 is poured in the porous material 1. Described tool high thermal conductivity porous material 1 is foamed copper, thermal conductivity is 386Wam, K), and density is 1.78g / cm 3 , the pore diameter is 4mm, the porosity is 80%, and it is a uniform three-dimensional connected network structure. ...

Embodiment 2

[0031] This embodiment provides a phase change heat storage material combining a porous material with high thermal conductivity and a low-melting-point metal, wherein the porous material 1 is foamed graphite with excellent thermal conductivity, and the low-melting-point metal 2 is an indium-bismuth-tin eutectic alloy ( 51wt%In, 32.5wt%Bi, 16.5wt%Sn) The melting point of this eutectic alloy is 60°C. The operating temperature was maintained at 65°C during perfusion. The low melting point metal 2 is evenly distributed in the foamed graphite.

[0032] The equivalent thermal conductivity of the phase change heat storage material provided by this embodiment is 23W / (m*K), which can quickly complete the heat absorption and heat release process, and can be widely used in spacecraft thermal control, chip heat dissipation, and electronic components Temperature control, solar thermal utilization and other fields.

Embodiment 3

[0034] A phase-change heat storage material combining a porous material with high thermal conductivity and a nano-metal fluid, wherein the porous material 1 is expanded graphite. The liquid metal in the nano metal fluid 2 is pure gallium, and its melting point is 29.8°C. The nanoparticle in this nanometer metal fluid 2 is nickel nanoparticle, and its particle diameter is 50nm, and the volume share in nanometer metal fluid is 3%. Due to the density and tension characteristics of pure gallium liquid metal itself, nickel nanoparticles are evenly distributed in the liquid metal, and deposition and accumulation are not easy to occur.

[0035]The specific manufacturing method of nickel nanoparticles evenly distributed in liquid metal refers to the content of patent CN1955252A. The foamed graphite is embedded in the working container, the outer diameter of the foamed graphite is 0-0.1mm greater than the inner diameter of the working container, gallium nano metal fluid is injected in...

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Abstract

The invention provides a composite phase-transition heat-storage material and a preparation method thereof. A porous material with high thermal conductivity is used as a supporting framework, and low-melting-point metal or low-melting-point metal with nano-particles is distributed in pores of the porous material, wherein melting point or solidus temperature of the low-melting-point metal is less than or equal to 80 DEG C; and thermal conductivity of the porous material is within 40-400 W/(m.K). The material provided by the invention has high equivalent thermal conductivity and high storage energy density; there is a large contact area between the liquid metal and the porous material; and the material has a wide application temperature range, has good fixability, stable physico-chemical property and good reversibility; and the problem of decreasing heat storage efficiency after multiple times of heat adsorption and release cycles is avoided.

Description

technical field [0001] The invention belongs to the field of heat exchange materials, and in particular relates to a composite phase change heat storage material of a high thermal conductivity porous material and a low melting point metal. Background technique [0002] Phase-change heat storage materials have a wide range of applications in the fields of spacecraft thermal control, phase-change energy storage, building energy conservation, solar thermal utilization, and chip heat dissipation. Commonly used phase change heat storage materials are divided into solid-liquid phase change materials and solid-solid phase change materials. Solid-liquid phase change materials include paraffin, fatty acid, sodium sulfate hydrate salt, calcium chloride hydrate salt, etc. Solid-solid phase change materials have multiple Alcohols, polymer compounds, layered perovskites, etc. However, whether it is an organic phase change material or an inorganic salt phase change material, their common...

Claims

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Application Information

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IPC IPC(8): C09K5/06
CPCC09K5/06C09K5/063
Inventor 易秋珍余兴华钟建夫朱济群
Owner CHANGDE LYRUN MATERIAL
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