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Foamy carbon/paraffin type phase-change composite material and encapsulation method thereof

A technology of phase change composite materials and encapsulation methods, which is applied in the field of foamed carbon/paraffin phase change composite materials and their encapsulation to achieve the effects of improving heat transfer performance, controlling thermal expansion, and reducing thermal stress

Active Publication Date: 2015-09-09
TECH & ENG CENT FOR SPACE UTILIZATION CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The object of the present invention is to provide a kind of foamed carbon / paraffin phase change composite material and its packaging method, thereby solving the aforementioned problems existing in the prior art

Method used

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  • Foamy carbon/paraffin type phase-change composite material and encapsulation method thereof
  • Foamy carbon/paraffin type phase-change composite material and encapsulation method thereof
  • Foamy carbon/paraffin type phase-change composite material and encapsulation method thereof

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Embodiment 1

[0027] refer to figure 1 , the carbon foam / paraffin phase change composite material described in this embodiment, the phase change composite material includes: carbon foam 1 and paraffin wax 1 filled in the pores of the carbon foam 1, the quality of the carbon foam 1 is 67g, The mass of the paraffin wax 1 is 95g; the mass fraction of n-octadecane in the paraffin wax is greater than 98%.

[0028] The physical and chemical parameters of the carbon foam 1 are: density 0.43g cm -3 , porosity 81%, thermal conductivity 133W·m -1 ·K -1 , the physical and chemical parameters of the paraffin 1 n-octadecane are: melting point 28.3°C, latent heat 245kJ / kg, thermal conductivity 0.15W·m -1 ·K -1 , density 814 S g cm -3 ,775 L g cm -3 .

[0029] The filling ratio of the paraffin wax 1 in the pores of the carbon foam 1 was 97.3%. It can effectively control the thermal expansion after packaging and reduce the thermal stress of the container.

[0030] The method for encapsulating ...

Embodiment 2

[0038] Example 2, the difference between this example and Example 1 is that the mass fraction of n-eicosane in the paraffin wax is greater than 98%; the quality of paraffin wax 2 is 99g, and the quality of carbon foam 2 is 57g. The physical and chemical parameters of foam carbon 2 are: density 0.37g cm -3 , porosity 84%, thermal conductivity 110W·m -1 ·K -1 , the physical and chemical parameters of the paraffin 1 n-eicosane are: melting point 37°C, latent heat 247kJ / kg, thermal conductivity 0.15W·m -1 ·K -1 , density 856 S -778 L g.cm -3 , others are identical with embodiment 1. The scanning electron micrograph of the carbon foam used in the present embodiment, as figure 2 Shown; The scanning electron micrograph of carbon foam / paraffin phase change composite material described in the present embodiment, as image 3 shown.

[0039] As those skilled in the art know: the high thermal conductivity foamed carbon material is a new type of material that can maintain its ow...

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Abstract

The invention discloses a foamy carbon / paraffin type phase-change composite material and an encapsulation method thereof, and relates to the technical field of phase-change energy storage. The phase-change composite material comprises foamy carbon and paraffin filling holes of the foamy carbon, wherein the weight ratio of the foamy carbon to the paraffin is 1:1.2-1:3.1; and the mass fraction of hydrocarbon in the paraffin is more than 98%, and the hydrocarbon is solid at normal temperature. The encapsulation method comprises the following steps: 1, cleaning a container, a cover plate and the foamy carbon; 2, filling the foamy carbon; 3, welding the cover plate; 4, filling with liquid paraffin; and 5, sealing a filling opening and performing finish machining. The phase-change heat-storage composite material disclosed by the invention is high in heat conductivity and good in heat transfer performance, and can realize control of the distribution of cavity positions; and vacuum electron beams are adopted to seal and weld the filling opening, thereby ensuring that a paraffin phase-change material is absolutely sealed in a cavity of a container.

Description

technical field [0001] The invention relates to the technical field of phase change energy storage, in particular to a carbon foam / paraffin phase change composite material and a packaging method thereof. Background technique [0002] Phase change materials are accompanied by a large amount of latent heat during the phase change process, which can absorb or release a large amount of energy and the phase change process is approximately isothermal. This feature can be used to control the temperature of objects through phase change heat storage. It is used in aviation It has broad application prospects in aerospace, solar energy utilization, heat recovery and other fields. At present, the key to phase change heat storage technology is to study and find phase change materials with high heat storage density and good performance. As an organic phase change material, paraffin has the advantages of large latent heat of phase change, wide melting point range, stable chemical properti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06B23K15/06
Inventor 盛强张靖驰任维佳童铁峰
Owner TECH & ENG CENT FOR SPACE UTILIZATION CHINESE ACAD OF SCI
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