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Modification method of phase change energy storage material

A phase-change energy storage material and phase-change material technology, applied in the field of modification of phase-change energy storage materials, can solve problems such as small equivalent thermal conductivity, settlement, wear and blockage of heat exchange equipment, and improve energy storage efficiency , the effect of low system density

Pending Publication Date: 2020-05-08
CHINA ELECTRONIC TECH GRP CORP NO 38 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although phase change materials have many advantages, their equivalent thermal conductivity is relatively small, generally lower than 0.5W / (m K), which is a major technical obstacle restricting their application. Generally, paraffin wax materials are modified with high thermal conductivity fillers. Due to the high density of metals, the weight of the entire energy storage system is likely to increase, and the metal particles are prone to settle in the melted phase change material due to gravity, which is also likely to cause heat in practical applications. Unfavorable results such as switching equipment wear and blockage greatly limit its application in industry

Method used

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Embodiment 1

[0022] Such as figure 1 as shown, figure 1 It is a flowchart of the modification method of the phase change energy storage material; the modification method of the phase change energy storage material in the present invention includes the following steps;

[0023] S1, preparation of framework material:

[0024] The micron-scale high thermal conductivity carbon fiber is uniformly dispersed in the mesophase pitch and then foamed and carbonized to form the skeleton material. The mass fraction of the micron-scale high thermal conductivity carbon fiber in the skeleton material is about 3% to 6%, and the pressure in the foaming process is 4MPa-8MPa;

[0025] S2, performing ceramic toughening on the framework material:

[0026] Deposit SiC (silicon carbide) ceramic material in CVD (Chemical Vapor Deposition) equipment for the framework material, and perform ceramic toughening on the framework material;

[0027] S3, catalyzing the growth of CNTs (carbon nanotubes) and graphene on ...

Embodiment 2

[0036] The internal cavity of the metal box of the phase change system is 80mm long, 60mm wide, and 20mm thick. In the process of modifying the paraffin phase change material, the density of the paraffin phase change material used is about 0.9g / cm 3 .

[0037] S1, first prepare the skeleton material, 3% mass content of high thermal conductivity carbon fiber and 97% mass content of mesophase pitch through 4MPa pressure, 450 ° C foaming process, 900 ° C carbonization process, prepared a density of 0.31 g / cm 3 of the skeleton material. The skeleton material is processed into a near-net size state of 85mmX65mmX25mm.

[0038] S2, deposit SiC material in special CVD (Chemical Vapor Deposition) equipment, perform ceramic toughening on the framework material, the process time is about 6 hours, and the density of the framework material is increased to 0.36g / cm 3 .

[0039] S3, adding a small amount of lanthanide rare earth particles to the framework material, and placing it in a CV...

Embodiment 3

[0043] The internal cavity of the metal box of the phase change system is 140mm long, 100mm wide, and 30mm thick. In the process of modifying the paraffin phase change material, the density of the paraffin phase change material used is about 0.9g / cm 3 .

[0044] S1, first prepare the skeleton material, 5% mass content of high thermal conductivity carbon fiber and 95% mass content of mesophase pitch through 6MPa pressure, 450 ° C foaming process, 900 ° C carbonization process, prepared a density of 0.46 g / cm 3 of the skeleton material. The framework material is processed to a near-net shape state.

[0045] S2, depositing SiC material in special CVD equipment, performing ceramic toughening on the framework material, the process time is about 6 hours, and the density of the framework material is increased to 0.53g / cm 3 .

[0046] S3, adding a small amount of copper metal particles to the framework material, and placing it in a CVD device to catalyze the deposition of CNTs, an...

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Abstract

The invention discloses a modification method of a phase change energy storage material. The method comprises preparing a framework material, carrying out ceramic toughening on the framework material,carrying out catalytic growth of carbon nanotubes and graphene on the framework material, carrying out high-temperature treatment on the framework material, packaging the framework material and circularly filling a phase change material. The phase-change material system generated by the method is low in density, the system density can be controlled within a range of less than 0.9 g / cm<3>, the heat conductivity of the modified phase-change energy storage material system reaches 40 W / (m.K)-120 W / (m.K), the energy storage efficiency of the phase-change material is improved, and the density, strength and heat conductivity of the modified material are controlled by changing the process, so that the heat conductivity and density of the phase-change system are adjusted.

Description

technical field [0001] The invention relates to the technical field of thermal control materials, in particular to a modification method of a phase change energy storage material. Background technique [0002] With the continuous development of aerospace technology, electronic equipment in aerospace vehicles need to work under specific temperature conditions to meet the conditions of use. Satellite platforms, hypersonic aircraft platforms, and missile weapon platforms are different from platforms in other fields such as ground and aviation. The heat dissipation methods of electronic equipment in the cabin are very limited. Usually, conventional methods such as natural convection, forced air cooling, or liquid cooling cannot be used to dissipate heat. Some of the heat dissipation schemes have been difficult to meet the application requirements. [0003] Phase change heat storage is to use the solid-liquid phase change process of phase change materials (PCM) to complete the s...

Claims

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Application Information

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IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 殷忠义薛伟锋王磊谢标方良超陈奇海方天宇孙晓伟
Owner CHINA ELECTRONIC TECH GRP CORP NO 38 RES INST
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