Loofah-derived porous silicon carbide ceramic-based high-temperature photo-thermal storage material and preparation method thereof

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: 2021-12-17
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

Method used

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  • Loofah-derived porous silicon carbide ceramic-based high-temperature photo-thermal storage material and preparation method thereof
  • Loofah-derived porous silicon carbide ceramic-based high-temperature photo-thermal storage material and preparation method thereof
  • Loofah-derived porous silicon carbide ceramic-based high-temperature photo-thermal storage material and preparation method thereof

Examples

Experimental program
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Embodiment 1

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

[0034] The loofah was washed successively with ethanol solution and deionized water, and then dried in a drying oven. Cut the dried loofah, remove the center of the cylindrical loofah, and keep only the sides of the cylindrical loofah. Dissolve 100g of low-gluten flour in 90mL of deionized water, and stir evenly. The low-gluten flour slurry was filled into the pores of the loofah and dried at room temperature for 48 hours. Then it was placed in a tube furnace for carbonization, and the temperature was raised to 500 °C at a heating rate of 0.5 °C / min in an inert gas atmosphere, and then to 1000 °C at a heating rate of 1 °C / min, and kept for 30 min. The carbonized porous precursor was cut into a cylindrical sample with a diameter of 13±0.3mm by a circular cutting machine, and then cut into a disc-shaped sample with a thickness of 3±0.3mm by a diamond wire cutting machine. Place the cu...

Embodiment 2

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

[0046] The loofah was washed successively with ethanol solution and deionized water, and then dried in a drying oven. Cut the dried loofah, remove the center of the cylindrical loofah, and keep only the sides of the cylindrical loofah. Dissolve 100g of low-gluten flour in 80mL of deionized water, and stir evenly. The low-gluten flour slurry was filled into the pores of the loofah and dried at room temperature for 48 hours. Then it was placed in a tube furnace for carbonization, and the temperature was raised to 500 °C at a heating rate of 0.5 °C / min in an inert gas atmosphere, and then to 900 °C at a heating rate of 1 °C / min, and kept for 30 min. The carbonized porous precursor was cut into a cylindrical sample with a diameter of 13±0.3mm by a circular cutting machine, and then cut into a disc-shaped sample with a thickness of 3±0.3mm by a diamond wire cutting machine. Place the cut...

Embodiment 3

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

[0053] The loofah was washed successively with ethanol solution and deionized water, and then dried in a drying oven. Cut the dried loofah, remove the center 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 evenly. The cornstarch slurry was filled into the pores of the loofah and dried at room temperature for 48 hours. Then it was placed in a tube furnace for carbonization, and the temperature was raised to 500 °C at a heating rate of 0.5 °C / min in an inert gas atmosphere, and then to 1100 °C at a heating rate of 1 °C / min, and kept for 30 min. The carbonized porous precursor was cut into a cylindrical sample with a diameter of 13±0.3mm by a circular cutting machine, and then cut into a disc-shaped sample with a thickness of 3±0.3mm by a diamond wire cutting machine. Place the cut porous c...

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Abstract

The invention discloses a loofah-derived porous silicon carbide ceramic-based high-temperature photo-thermal storage material and a preparation method thereof. The storage material is prepared by compounding a loofah-derived porous silicon carbide skeleton and a phase-change material, wherein the porosity of the loofah-derived porous silicon carbide skeleton is 60-90%, and the loofah-derived porous silicon carbide skeleton is prepared by carbonizing loofah sponge filled with a carbon source, reacting the carbonized loofah sponge with molten silicon and removing redundant silicon. The phase change material is eutectic salt composed of sodium chloride and sodium fluoride. The pores of the porous silicon carbide ceramic skeleton are filled with a phase change material by adopting a vacuum impregnation method to obtain the loofah-derived porous silicon carbide ceramic-based high-temperature photo-thermal storage material. The loofah-derived porous silicon carbide ceramic framework has excellent connectivity and adjustable porosity, the thermal conductivity of the storage material is remarkably improved, the heat storage density is higher, the full-spectrum solar energy capturing capacity is high, and a new direction is provided for a substitute material of sustainable energy in the heat storage technology.

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 porous silicon carbide ceramic framework derived from loofah and sodium chloride-sodium fluoride eutectic salt. Background technique [0002] Phase change materials are considered to be potential heat storage materials due to their large heat storage density and constant temperature during the heat storage and release process. However, phase change materials have low thermal conductivity, resulting in slow heat storage rates. In order to solve this problem, the composite method of porous skeleton and phase change material is usually used to improve the thermal conductivity. Commonly used porous frameworks include porous metal frameworks and porous carbon frameworks, etc. However, metal materials are easily corroded, especially in molten salts, and the high density of metals will lead to heavy weight and low heat storage d...

Claims

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Application Information

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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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