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Ceramic-based high-thermal-conductivity composite phase-change heat storage material and preparation method thereof

A technology of composite phase change and heat storage materials, which is applied in the field of ceramic-based high thermal conductivity composite phase change heat storage materials and preparation, can solve the problems of expensive nano-scale adsorption materials, high graphite packaging technology, and potential safety hazards, etc. The effect of low expansion rate, uniform distribution and stable performance

Active Publication Date: 2020-08-18
NARI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the common technical means are composite nano-scale adsorption materials and graphite, but they are not enough to meet the production needs. On the one hand, it is because the price of nano-scale adsorption materials is relatively expensive, and on the other hand, because the graphite packaging process is relatively high, there are potential safety hazards.

Method used

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  • Ceramic-based high-thermal-conductivity composite phase-change heat storage material and preparation method thereof
  • Ceramic-based high-thermal-conductivity composite phase-change heat storage material and preparation method thereof
  • Ceramic-based high-thermal-conductivity composite phase-change heat storage material and preparation method thereof

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preparation example Construction

[0038] Another aspect of the present invention also provides a preparation method of a ceramic-based high thermal conductivity composite phase change heat storage material, including:

[0039] (1) Weigh the inorganic salt and aluminum nitride according to the proportion of the formula, stir evenly, add water and mix them, and form them to prepare the precursor of the composite phase change heat storage material;

[0040] (2) The precursor prepared in step (1) is sealed and packaged, and placed in a blast drying oven for low-temperature reaction to prepare a green body;

[0041] (3) The green body prepared in step (2) is placed in a muffle furnace, the temperature is raised by program, and heated and sintered to obtain a ceramic-based high thermal conductivity composite phase-change heat storage material.

[0042] Further, the raw materials of the formula are: 50%-70% of inorganic salt, 20-50% of aluminum nitride, and 5%-15% of water according to mass percentage.

[0043] Furt...

Embodiment 1

[0050] A ceramic-based high thermal conductivity composite phase change heat storage material, the preparation process is: weigh 2.6g Li 2 CO 3 , 3.4gNa 2 CO 3 1. Put 4g of AlN powder into the powder machine and stir evenly, then take 1g of water and add it into the powder machine and mix well. The obtained mixed powder was pressed into shape with a press, the pressure was 30 MPa, and the holding time was 3 minutes to obtain the precursor. The precursor was sealed and packaged and placed in a blast oven for low-temperature reaction, the set temperature was 70°C, and the reaction time was 16 hours. Transfer the obtained green body to a ceramic boat, place it in a muffle furnace, raise the temperature to 105°C at a heating rate of 5°C / min, and keep it for 1 hour; then raise it to 300°C at a heating rate of 10°C / min, and hold it for 1.5 h; finally, the temperature was raised to 550°C at a heating rate of 5°C / min, and kept for 2 hours; cooled to room temperature with the furna...

Embodiment 2

[0055] A ceramic-based high thermal conductivity composite phase change heat storage material, the preparation process is: weigh 2.6g Li 2CO 3 , 3.4gNa 2 CO 3 1. Put 3g of AlN powder into the powder machine and stir evenly, then take 1g of water and add it into the powder machine and stir evenly. The obtained mixed powder was pressed into shape with a press, the pressure was 30 MPa, and the holding time was 3 minutes to obtain the precursor. The precursor was sealed and packaged and placed in a blast oven for low-temperature reaction. The set temperature was 60°C, and the reaction time was 16 hours. Transfer the obtained green body to a ceramic boat, place it in a muffle furnace, raise the temperature to 105°C at a heating rate of 5°C / min, and keep it for 1 hour; then raise it to 300°C at a heating rate of 10°C / min, and hold it for 1.5 h; finally, the temperature was raised to 550°C at a heating rate of 5°C / min, and kept for 2 hours; cooled to room temperature with the fur...

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Abstract

The invention discloses a ceramic-based high-thermal-conductivity composite phase-change heat storage material and a preparation method thereof. The ceramic-based high-thermal-conductivity composite phase-change heat storage material is prepared from the following raw materials in percentage by mass: 50 to 70 percent of inorganic salt, 20 to 50 percent of aluminum nitride and 5 to 15 percent of water. The preparation method comprises the following steps: weighing inorganic salt and aluminum nitride according to a formula ratio, uniformly stirring the components, adding water, mixing the components, and molding the mixture to prepare a composite phase change heat storage material precursor; then sealing and packaging the precursor, and placing in a blast drying oven for low-temperature reaction to prepare a green body; and finally, heating and sintering the green body to obtain the ceramic-based high-thermal-conductivity composite phase change heat storage material. The heat-conductingceramic-based framework is prepared in one step through an in-situ reaction method, the heat conductivity of the composite phase-change material is greatly enhanced while eutectic phase-change salt ispackaged, and the heat conductivity can reach 4 W / m.K or above; due to the adoption of micron-sized raw materials, the production cost can be remarkably reduced, and the potential of industrial production is achieved.

Description

technical field [0001] The invention relates to a ceramic-based high thermal conductivity composite phase-change heat storage material and a preparation method thereof, belonging to the technical field of phase-change material preparation. Background technique [0002] With the increasingly tense energy supply and the increasing pressure on environmental protection, phase change materials have been highly valued by people due to their unique characteristics, and have been applied in more and more fields, such as residential heating, steam production, waste heat recovery, etc. The basic principle of phase change energy storage technology is to store energy through the isothermal phase change process of materials, and then release the energy for use when needed. It is an important means to solve the mismatch between energy space and time. [0003] In the phase change material system, inorganic salt has a relatively suitable melting point and a large phase change latent heat, w...

Claims

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Application Information

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IPC IPC(8): C04B35/581C04B35/64C09K5/06
CPCC04B35/581C04B35/64C04B2235/3201C04B2235/3203C04B2235/3208C04B2235/444C04B2235/6562C04B2235/9607C09K5/063
Inventor 杨波王启扬孙富华刘杨叶闻杰杨肖杜炜杨冬梅
Owner NARI TECH CO LTD
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