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Fluorine salt-based nano high temperature phase change heat storage composite material and preparation method thereof

A high-temperature phase change, composite material technology, applied in heat exchange materials, chemical instruments and methods, heating devices, etc., can solve the problems of large volume shrinkage, poor heat transfer performance, low thermal conductivity, etc., to enhance heat transfer capacity. , The effect of high thermal conductivity and high latent heat of phase change

Inactive Publication Date: 2009-12-30
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a fluorine-based nano-scale high-temperature phase-change thermal storage composite material and its preparation method. The composite phase-change thermal storage material can overcome the poor heat transfer performance and thermal conductivity of existing fluorine-based phase change materials Defects such as low volume and large volume shrinkage during solidification

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0018] Examples The production process is as follows: Lithium fluoride, a solid-liquid phase change thermal storage material at ≥600°C, or lithium fluoride and calcium fluoride are mixed at a certain mass percentage to form a certain mass of molten mixture, and in the molten salt eutectic Add a certain mass percentage of nanometer metal particles, magnetically stir the melt, heat-preserve and ultrasonically treat it, and cool it to a certain temperature in a vacuum heating furnace after the finished product is produced, put it into the prepared molding container and seal it to get the finished product.

[0019] Step 1: According to 100% fluorine salt LiF, or LiF and CaF 2 A mixture of LiF and CaF 2 The mass composition ratio of the mixture is 2 to 1.1:1, the fluorine salt is weighed, mechanically stirred as evenly as possible, put into a vacuum heating furnace to heat, degas and dewater and melt;

[0020] Step 2: Add nano-metal particles accounting for 1%-5% of the total mass...

example 1

[0022] Example 1: The high-temperature phase-change heat storage material adopts lithium fluoride and calcium fluoride in a mass composition ratio of 1.1:1, and adds 10nm nano-silver particles with a mass ratio of 1% into the molten mixed salt, and the forming container material is Haynes188. Stir the molten material by magnetic force for 60 minutes, and keep it warm for 10 minutes with ultrasonic waves to prepare a uniform and stable fluorine-based nanometer high-temperature phase-change thermal storage composite material. The prepared fluorine-based nanometer high-temperature phase-change thermal storage composite material has good stability, and the thermal conductivity of the composite added with the nanometer is greatly improved compared with that of the mixture of lithium fluoride and calcium fluoride, regardless of the liquid phase or the solid phase.

[0023] Implementation results: The latent heat of phase change of the prepared composite high-temperature phase change ...

example 2

[0024] Example 2: The mass composition ratio of lithium fluoride and calcium fluoride is 2:1 as the high-temperature phase-change heat storage material, and 20nm nano-silver particles with a mass ratio of 2% are added to the molten mixed salt, and the forming container material is Haynes188. Stir the molten material by magnetic force for 10 minutes, and keep it warm and ultrasonic for 80 minutes to prepare a uniform and stable fluorine-based nanometer high-temperature phase-change thermal storage composite material. The prepared fluorine-based nanometer high-temperature phase-change thermal storage composite material has good stability, and the thermal conductivity of the composite added with the nanometer is greatly improved compared with that of the mixture of lithium fluoride and calcium fluoride, regardless of the liquid phase or the solid phase.

[0025] Implementation results: The phase change latent heat of the prepared composite high temperature phase change heat storag...

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Abstract

The invention provides a fluorine salt-based nano high temperature phase change heat storage composite material, which is characterized by compounding nano material and fluorine salt material to form uniform and stable compound. The synthetic method comprises the following steps: stirring evenly fluorine salt and placing into a vacuum electric furnace; heating to a temperature which is above the phase change temperature by 50-100 DEG C; degassing and dehydrating to lead the fluorine salt in a melting state; adding nano metal particles which account for 1%-5% of the total mass to molten salt crystals; magnetically stirring the molten material for 10-60min with the heat preservation ultrasound of 10-120min; and preparing the uniform and stable fluorine salt-based nano high temperature phase change heat storage composite material. The prepared fluorine salt-based nano high temperature phase change heat storage composite material has the advantages of rapid heat storage and heat release, high heat storage density and good heat-conducting property, can be used in various fields like space station solar energy thermo-motive power generating system, solar power generation, high temperature residue heat recycling and the like, and is in particular applicable to a heat absorber of the space solar energy thermo-motive power generating system.

Description

technical field [0001] The invention relates to the technical field of heat storage materials. Background technique [0002] With the enhancement of people's awareness of energy saving and environmental protection, energy-saving materials are increasingly concerned. The research and promotion of phase change thermal storage materials can reduce energy consumption and achieve the purpose of energy saving. Phase change energy storage materials refer to materials that can exchange energy with the external environment during the phase change process, so as to achieve the purpose of controlling the ambient temperature and utilizing energy. High-temperature solid-liquid phase change heat storage materials are mainly used in low-power space station power plants, solar power generation, and industrial waste heat recovery. At present, solid-liquid phase change high-temperature phase change materials are mainly high-temperature molten salts, some alkalis, and mixed salts. High-temp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06F24J2/00
Inventor 崔海亭
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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