Biomorphic silicon carbide ceramic high-temperature photo-thermal storage material

A silicon carbide ceramic, biomorphic technology, applied in heat exchange materials, ceramic products, chemical instruments and methods, etc., can solve the constraints of renewable energy and waste heat efficient utilization technology, weak adaptive regulation ability, and low energy utilization rate. and other problems, to achieve the effects of excellent quality transmission capacity, improved energy conversion efficiency, and low toxicity

Active Publication Date: 2021-03-19
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

Most of the existing solar heat storage systems are surface-type. The solar energy is first absorbed by the surface and converted into heat, and then transmitted to the working fluid. There are many heat transfer links and large heat loss.
The t

Method used

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  • Biomorphic silicon carbide ceramic high-temperature photo-thermal storage material
  • Biomorphic silicon carbide ceramic high-temperature photo-thermal storage material
  • Biomorphic silicon carbide ceramic high-temperature photo-thermal storage material

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[0039] Each parameter measurement method in the implementation and proportion of the present invention is:

[0040] 1. The thermal conductivity of the material is measured using a laser thermally charger.

[0041] 2, using the phase change of the DSC test material.

[0042] 3. The specific heat capacity of DSC test materials.

[0043] 4, using a spectroscopic absorption rate of the spectrophotometer.

[0044] The embodiments of the present invention will be further described below with example:

[0045] The first step: the preparation of the bionic silicon carbide ceramic skeleton.

[0046] The wood is cut into a length of 70 mm, a width of 50 mm, and a thickness of 30 mm. Cutting wood is placed at 70 ° C for 2 to 3 days in a dry box. Placed in a tubular furnace, a nitrogen protection atmosphere, heated to 500 ° C at a temperature rise rate of 0.5 ° C / min, and then warmed to 900 to 1100 ° C for 30 to 60 minutes at 1 ° C / min. The carbonized precursor was finely cut into a diame...

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Abstract

The invention provides a biomorphic silicon carbide ceramic high-temperature photo-thermal storage material and a preparation method thereof. The heat storage material is prepared by compounding a biomorphic silicon carbide ceramic framework and chlorate. The biomorphic silicon carbide ceramic is a ceramic material generated by high-temperature reaction of molten silicon and a charcoal porous precursor, and silicon carbide ceramic frameworks with different porosities can be obtained by different wood precursors. The phase-change heat storage material is prepared by fully and uniformly mixing sodium chloride and potassium chloride in a ball mill and drying to obtain the sodium-potassium chloride eutectic salt. The biomorphic silicon carbide ceramic framework is coated with the phase changeheat storage material by adopting a vacuum impregnation method, so that pores of the ceramic framework are filled with the phase change material, thereby obtaining the biomorphic silicon carbide ceramic high-temperature photo-thermal storage material. The composite material prepared by the invention has the excellent characteristics of high thermal conductivity (116 W/mK), high spectral absorptionperformance (92%) and high heat storage density (453 kg/kJ), and is expected to promote the development of constructing a clean, low-carbon, efficient and safe energy system.

Description

technical field [0001] The invention relates to the field of phase-change heat storage materials, in particular to a heat storage material prepared by compounding biomorphic porous silicon carbide ceramics and chloride salts. Background technique [0002] More than 90% of the world's energy is related to heat in the process of extraction, conversion, transmission and utilization. Heat storage can effectively alleviate the mismatch between thermal energy supply and demand in terms of time, space, and intensity, improve energy utilization, and reduce energy utilization costs. Therefore, it is a key technology for building a clean, low-carbon, efficient and safe energy system! [0003] There are three types of heat storage technologies, among which latent heat and sensible heat technologies are the most researched. However, no matter what kind of technology, there is a problem that it is difficult to balance high heat storage density and high power density. Taking sensible he...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B35/65C04B38/06C04B41/85C09K5/06
CPCC04B35/573C04B38/0675C04B41/85C04B41/009C04B41/5012C09K5/063C04B2235/9607C04B38/0074
Inventor 刘向雷徐巧宣益民
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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