Low-melting-point metal shaped phase-change material and preparation method thereof

A low-melting-point metal and phase-change material technology, applied in the field of materials, can solve the problems of easy deformation of low-melting point metals, high cost of shaped carriers, and difficult processing, etc., to improve wettability and affinity, increase flexibility and application range, the effect of reducing density

Active Publication Date: 2020-04-21
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, low-melting-point metals have disadvantages such as deformation and leakage during phase transition. Therefore, when using low-melting-point metals as heat storage materials, it is necessary to provide them with suitable shaping carriers.
In the existing technology, R&D personnel often blindly pursue low-melting-point metal-shaped phase-change materials with higher thermal conductivity, but ignore that the thermal conductivity of low-melting-point metals is already very good. Defects such as easy processing

Method used

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  • Low-melting-point metal shaped phase-change material and preparation method thereof
  • Low-melting-point metal shaped phase-change material and preparation method thereof
  • Low-melting-point metal shaped phase-change material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0066] A preparation method of a low-melting-point metal shaped phase-change material, comprising the steps of:

[0067] 30g mass fraction of 1% graphene oxide dispersion (wherein: the thermally conductive material is graphene oxide, the solvent is a mixture of ethanol and water, and the mass ratio of ethanol and water in the solvent is 1:1) is packed in a 50mL container In a beaker, immerse a piece of polystyrene foam (2cm×2cm×2mm) in the dispersion liquid, and press it with an iron block to prevent it from floating up; put the beaker in a vacuum oven, vacuumize for 5min, then open the valve and resume pressure, so that the graphene oxide dispersion fully enters the polystyrene foam; when the air pressure in the vacuum oven returns to normal atmospheric pressure, the foam is taken out from the beaker, placed in a 60°C oven for drying, and the graphene oxide is deposited on the polystyrene foam. On the pore wall inside the foam; repeat the above dipping deposition step 1 time ...

Embodiment 2

[0075] A preparation method of a low-melting-point metal shaped phase-change material, comprising the steps of:

[0076] 100g mass fraction of 1% graphene oxide aqueous dispersion (wherein: the thermal conductive material is graphene oxide, and the solvent is water) is packed in a plastic cup with a volume of 200mL, and a piece of melamine foam (cube) with a side length of 2cm ) was submerged in the dispersion, and pressed with an iron block to prevent it from floating; put the plastic cup into a vacuum oven, evacuate for 30 minutes, then open the valve and pressurize again, so that the graphene oxide water dispersion fully entered the foam; when the vacuum oven After the air pressure inside returned to normal atmospheric pressure, the foam was taken out from the plastic cup, placed in an oven at 80°C for drying, so that graphene oxide was deposited on the pore walls inside the foam; the above dipping and deposition steps were repeated twice to obtain a composite Foam; heat-tr...

Embodiment 3

[0086] 500g of aqueous dispersion containing 0.5wt.% graphene oxide and 1wt.% multi-walled carbon nanotubes (wherein: the heat-conducting material is graphene oxide and multi-walled carbon nanotubes, and the solvent is water) is contained in a plastic container with a volume of 1L In the box, 100 pieces of melamine foam (cubes) with a side length of 6mm are immersed in the dispersion liquid, and fastened with wire mesh to prevent floating; put the plastic box in a vacuum oven, vacuumize for 10min, and then open the valve to repress, so that The dispersion liquid fully enters the foam; when the air pressure in the vacuum oven returns to normal atmospheric pressure, take the foam out of the plastic box and place it in an oven at 80°C for drying, so that graphene oxide and carbon nanotubes are deposited in the pores inside the foam On the wall, syntactic foam is made.

[0087] Put 800g of lead-bismuth alloy with a melting point of 50°C into a plastic box, and heat in a blast oven a...

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Abstract

The embodiment of the invention relates to a low-melting-point metal shaped phase-change material and a preparation method thereof. The preparation method comprises the following steps: dispersing a heat-conducting material in a solvent to form a dispersion, soaking polymer foam in the dispersion, and taking out and drying the soamed polymer foam to obtain composite foam; and soaking the compositefoam into molten low-melting-point metal, and taking out and cooling the soaked composite foam to obtain the low-melting-point metal shaped phase-change material. The low-melting-point metal shaped phase-change material obtained by the preparation method is easy to process, good in heat storage performance and good in interface affinity.

Description

technical field [0001] The invention relates to the field of materials, in particular to a low melting point metal shaped phase change material and a preparation method thereof. Background technique [0002] Phase change materials (Phase Change Materials) can absorb or release a large amount of heat within a small temperature range, and are widely used in thermal energy storage, solar energy utilization, waste heat recovery, building temperature regulation, thermal management, thermal interface materials and other fields. In recent years, low melting point metals have attracted attention in the fields of thermal interface materials and phase change heat storage materials. Low melting point metals usually refer to metals with a melting point not higher than 300°C. Low melting point metals have large phase change enthalpy, excellent thermal conductivity and low corrosion resistance, and are ideal thermal conductivity materials, thermal interface materials or phase change stora...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 包晨露许红丽张松迪俞康康伍森
Owner TIANJIN POLYTECHNIC UNIV
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