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High-temperature phase-changing composite heat storage ceramic matrix material and preparation method thereof

A high-temperature phase change, ceramic-based technology, used in heat exchange materials, chemical instruments and methods, reagents, etc. The effect of large latent heat, high thermal conductivity, and fast heat absorption and heat release

Inactive Publication Date: 2018-05-11
TIANJIN QIZHEN ENERGY SAVING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current heat storage materials generally have the disadvantage of poor thermal conductivity, so the phase change heat storage components made of them cannot fully exert the heat storage function of the heat storage material due to their poor thermal conductivity.
Secondly, when the heat storage material undergoes a solid-liquid phase transition, it will cause leakage problems

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0019] Further, the present invention also provides a method for preparing the above-mentioned high-temperature phase-change composite heat storage ceramic base material, which specifically includes the following steps:

[0020] (1) Mix 20 to 30 parts of lithium carbonate, 20 to 30 parts of potassium carbonate, 30 to 40 parts of sodium carbonate and 10 to 15 parts of ceramic matrix, grind to 400 to 500 mesh and mix evenly to obtain an inorganic salt ceramic matrix system;

[0021] (2) Heat 1-2 parts of high thermal conductivity carbon fiber and 1-2 parts of doped graphite in an inert gas at 500-600°C for 15 minutes, then add it to the above-mentioned inorganic salt ceramic matrix system, and mix well by grinding to 400-500 mesh , forming a composite system;

[0022] (3) After the above composite system is pressurized and formed, the pressurized pressure is 2.4-2.8MPa, the pressurized time is 2-2.5min, and it is sintered at 700-760°C for 20-30min. After the sintering is complet...

Embodiment 1

[0026] A method for preparing a high-temperature phase-change composite heat storage ceramic base material, the method specifically includes the following steps:

[0027] (1) Mix 25 parts of lithium carbonate, 25 parts of potassium carbonate, 40 parts of sodium carbonate and 15 parts of SiC ceramic matrix, grind to 400 mesh and mix uniformly to obtain an inorganic salt ceramic matrix system;

[0028] (2) Heat 1 part of high thermal conductivity carbon fiber and 2 parts of nitrogen-doped graphite in an inert gas at 520°C for 15 minutes, then add them to the inorganic salt ceramic matrix system, and grind them to 400 mesh to form a composite system;

[0029] (3) After the composite system is pressurized and formed, the pressurized pressure is 2.8MPa, the pressurized time is 2min, and it is sintered at 760°C for 20min. The heating rate during sintering is 5°C / min. The rate is 10°C / min, and a high-temperature phase change composite heat storage ceramic matrix material is obtained....

Embodiment 2

[0031] A method for preparing a high-temperature phase-change composite heat storage ceramic base material, the method specifically includes the following steps:

[0032] (1) 20 parts of lithium carbonate, 30 parts of potassium carbonate, 30 parts of sodium carbonate and 10 parts of MgO ceramic matrix are mixed, and ground to 500 mesh and mixed uniformly to obtain an inorganic salt ceramic matrix system;

[0033] (2) Heat 2 parts of high thermal conductivity carbon fiber and 1 part of nitrogen-doped graphite in an inert gas at 600°C for 15 minutes, then add them to the inorganic salt ceramic matrix system, and grind them to 500 mesh to form a composite system;

[0034] (3) After the composite system is pressurized, the pressurized pressure is 2.4MPa, the pressurized time is 2.5min, and it is sintered at 700°C for 30min. The heating rate during sintering is 3°C / min. The cooling rate was 10°C / min, and a high-temperature phase change composite heat storage ceramic matrix material...

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Abstract

The invention belongs to the technical field of heat storage materials and particularly discloses a high-temperature phase-changing composite heat storage ceramic matrix material and a preparation method thereof. The material is prepared from raw materials in parts by weight as follows: 10-15 parts of a ceramic matrix, 20-30 parts of lithium carbonate, 20-30 parts of potassium carbonate, 30-40 parts of sodium carbonate, 1-2 parts of high-thermal-conductivity carbon fiber and 1-2 parts of doped graphite. The prepared high-temperature phase-changing composite heat storage ceramic matrix materialhas the advantages of large phase change latent heat, high high-temperature stability, low toxicity, small corrosion and the like and can be used as a phase-changing heat storage material, and the energy conversion efficiency is improved; the thermal conduction performance is higher, and the heat absorption and release speed is higher; the appearance of the material cannot be changed during phasechanging, and leakage can be effectively prevented.

Description

technical field [0001] The invention belongs to the technical field of heat storage materials, and in particular relates to a high-temperature phase-change composite heat storage ceramic base material and a preparation method thereof. Background technique [0002] Energy saving and environmental protection are an important topic in the field of energy utilization. Using phase change latent heat of phase change heat storage materials to store energy is a new type of energy saving technology. During the phase change process, the heat storage material absorbs the heat of the surrounding environment, and releases heat to the surrounding environment when the temperature of the surrounding environment decreases, so as to achieve the purpose of controlling the temperature of the surrounding environment and saving energy. It has broad application prospects in solar energy utilization, heat energy recovery, air conditioning and refrigeration, building energy saving, aerospace and oth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C09K5/06
CPCC04B35/80C04B2235/3206C04B2235/3418C04B2235/3826C04B2235/425C04B2235/442C04B2235/5248C09K5/063Y02P20/141
Inventor 唐华
Owner TIANJIN QIZHEN ENERGY SAVING TECH CO LTD
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