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A kind of loofah-derived porous silicon carbide ceramic-based high-temperature photothermal storage material and preparation method

A technology of porous silicon carbide and storage materials, applied in the direction of ceramic products, heat exchange materials, chemical instruments and methods, etc., can solve the problems that the porosity cannot be automatically adjusted and affects the thermal conductivity and heat storage density of heat storage materials, etc., to achieve The effects of excellent connectivity, improved spectral absorption performance, and improved spectral capture performance

Active Publication Date: 2022-07-08
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when a single porous silicon carbide ceramic is combined with a phase change material, the porosity cannot be automatically adjusted due to the fixed pore size, which will directly affect the thermal conductivity and thermal storage density of the thermal storage material.

Method used

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  • A kind of loofah-derived porous silicon carbide ceramic-based high-temperature photothermal storage material and preparation method
  • A kind of loofah-derived porous silicon carbide ceramic-based high-temperature photothermal storage material and preparation method
  • A kind of loofah-derived porous silicon carbide ceramic-based high-temperature photothermal storage material and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Step 1: Preparation of loofah-derived porous silicon carbide ceramic framework

[0034] Wash the loofah with ethanol solution and deionized water in turn and place it in a drying oven to dry. Cut the dried loofah, remove the central part of the cylindrical loofah, and keep only the sides of the cylindrical loofah. Dissolve 100 g of low-gluten flour in 90 mL of deionized water and stir mechanically evenly. The low-gluten flour slurry was filled into the pores of the loofah and dried at room temperature for 48 hours. It was then placed in a tube furnace for carbonization, heated to 500°C at a heating rate of 0.5°C / min under an inert gas atmosphere, and then heated to 1000°C at a heating rate of 1°C / min, and kept for 30 minutes. The carbonized porous precursor was cut into a cylindrical sample with a diameter of 13±0.3mm by a circular cutter, and then a disc-shaped sample with a thickness of 3±0.3mm was cut by a diamond wire cutter. The cut porous carbon precursor is pl...

Embodiment 2

[0045] Step 1: Preparation of loofah-derived porous silicon carbide ceramic framework

[0046] Wash the loofah with ethanol solution and deionized water in turn and place it in a drying oven to dry. Cut the dried loofah, remove the central part of the cylindrical loofah, and keep only the sides of the cylindrical loofah. Dissolve 100 g of low-gluten flour in 80 mL of deionized water and stir mechanically evenly. The low-gluten flour slurry was filled into the pores of the loofah and dried at room temperature for 48 hours. It was then carbonized in a tube furnace, heated to 500°C at a heating rate of 0.5°C / min under an inert gas atmosphere, and then heated to 900°C at a heating rate of 1°C / min, and kept for 30 minutes. The carbonized porous precursor was cut into a cylindrical sample with a diameter of 13±0.3mm by a circular cutter, and then a disc-shaped sample with a thickness of 3±0.3mm was cut by a diamond wire cutter. The cut porous carbon precursor was placed in a high...

Embodiment 3

[0052] Step 1: Preparation of loofah-derived porous silicon carbide ceramic framework

[0053] Wash the loofah with ethanol solution and deionized water in turn and place it in a drying oven to dry. Cut the dried loofah, remove the central part of the cylindrical loofah, and keep only the sides of the cylindrical loofah. Dissolve 100 g of cornstarch in 100 mL of deionized water and stir mechanically evenly. The corn starch slurry was filled into the pores of the loofah and dried at room temperature for 48 hours. It was then carbonized in a tube furnace, heated to 500°C at a heating rate of 0.5°C / min under an inert gas atmosphere, and then heated to 1100°C at a heating rate of 1°C / min, and kept for 30 minutes. The carbonized porous precursor was cut into a cylindrical sample with a diameter of 13±0.3mm by a circular cutter, and then a disc-shaped sample with a thickness of 3±0.3mm was cut by a diamond wire cutter. The cut porous carbon precursor was placed in a high-temperat...

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Abstract

The invention discloses a loofah-derived porous silicon carbide ceramic-based high-temperature photothermal storage material and a preparation method. The storage material is made by compounding a loofah-derived porous silicon carbide skeleton and a phase change material; wherein, the pores of the loofah-derived porous silicon carbide skeleton The loofah-derived porous silicon carbide skeleton is prepared by carbonization of the loofah filled with carbon source and then reacting with molten silicon and removing excess silicon. Phase change materials are eutectic salts of sodium chloride and sodium fluoride. The pores of the porous silicon carbide ceramic skeleton are filled with the phase change material by the vacuum impregnation method, and the loofah-derived porous silicon carbide ceramic-based high-temperature photothermal storage material can be obtained. The loofah-derived porous silicon carbide ceramic framework of the invention has excellent connectivity and adjustable porosity, the thermal conductivity of the storage material is significantly improved, the heat storage density is higher, the full-spectrum solar energy capture ability is strong, and it is sustainable in the heat storage technology. Alternative materials for energy offer new directions.

Description

technical field [0001] The invention belongs to a phase-change heat storage material, in particular to a composite heat storage material prepared by using a porous silicon carbide ceramic framework derived from a loofah and a sodium chloride-sodium fluoride eutectic salt. Background technique [0002] Phase change materials are considered as potential heat storage materials due to their large heat storage density and constant temperature during heat storage and release. However, phase change materials have low thermal conductivity, resulting in slow heat storage rates. To solve this problem, the method of composite porous framework and phase change material is usually used to improve the thermal conductivity. Commonly used porous frameworks include porous metal frameworks and porous carbon frameworks. However, metal materials are easily corroded, especially in molten salts, and the high density of metals results in heavy heat storage systems and low heat storage density. T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/06C04B35/565C04B41/85C09K3/00C09K5/06
CPCC04B38/0645C04B38/0675C04B35/565C04B41/5018C04B41/85C09K5/063C09K3/00C04B41/5012C04B41/4535Y02E10/40
Inventor 刘向雷徐巧宣益民
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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