Al/Al2O3 heat storage material and preparation method thereof

A heat storage material and matrix material technology, applied in the direction of heat exchange materials, chemical instruments and methods, etc., to achieve the effects of enhancing mechanical properties and stability, facilitating large-scale production, and reducing material consumption

Inactive Publication Date: 2010-08-11
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, metal materials have a liquid phase during the phase change ...

Method used

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  • Al/Al2O3 heat storage material and preparation method thereof
  • Al/Al2O3 heat storage material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0023] 1) Implementation conditions

[0024] The aluminum liquid is atomized using an atomizing device at 700°C, and the atomized droplets are cooled in an oxidation chamber at 400°C. The oxidizing atmosphere is water vapor, and argon is used as the water vapor carrier gas. The grain size (diameter) of the Al2O3 / Al heat storage material obtained after cooling is 1000 μm, and the diameter (diameter) of the metallic aluminum core is 600 μm. Press the sample machine at a pressure of 12Mpa and a pressure holding time of 20min. Of compacts. Sintering in a sintering kiln with an air atmosphere, heat preservation and sintering at 800°C for 1.5 hours to obtain a finished product.

[0025] 2) Implementation results

[0026] The sintering strength of the finished product is very high. The coefficient of thermal expansion is 0.12 and the sintered density is 2.87g / cm 3 , The porosity is 16-21%, the thermal conductivity is 34.98w / m·k, and the heat storage density at 800-825°C is 1520kJ / kg.

Embodiment 2

[0028] 1) Implementation conditions

[0029] The aluminum liquid is atomized using an atomizing device at 700°C, and the atomized droplets are cooled in an oxidation chamber at 500°C, and the oxidizing atmosphere is carbon dioxide. The grain size (diameter) of the Al2O3 / Al heat storage material obtained after cooling is 1500 μm, and the diameter (diameter) of the metallic aluminum core is 700 μm. Press the sample machine at a pressure of 12Mpa and a pressure holding time of 20min. Of compacts. Sintering in a sintering kiln with an air atmosphere, heat preservation and sintering at 800°C for 1.5 hours to obtain a finished product.

[0030] 2) Implementation results

[0031] The sintering strength of the finished product is very high. The coefficient of thermal expansion is 0.16 and the sintered density is 3.27g / cm 3 , The porosity is 20-25%, the thermal conductivity is 30.48w / m·k, and the heat storage density at 800-825℃ is 1320kJ / kg.

Embodiment 3

[0033] 1) Implementation conditions

[0034] The aluminum liquid is atomized using an atomizing device at 700°C, and the atomized small droplets are cooled in an oxidation chamber at 300°C, and the oxidizing atmosphere is air. The grain size (diameter) of the Al2O3 / Al heat storage material obtained after cooling is 800 μm, and the diameter (diameter) of the metallic aluminum core is 300 μm. Press the sample machine at a pressure of 12Mpa and a pressure holding time of 20min. Of compacts. Sintering in a sintering kiln with an air atmosphere, heat preservation and sintering at 800°C for 1.5 hours to obtain a finished product.

[0035] 2) Implementation results

[0036] The sintering strength of the finished product is very high. The coefficient of thermal expansion is 0.12, and the sintered density is 2.68g / cm 3 , The porosity is 18-22%, the thermal conductivity is 40.48w / m·k, and the heat storage density at 800-825℃ is 1520kJ / kg.

[0037] The oxidizing atmosphere of the present inv...

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Abstract

The invention discloses an Al/Al2O3 heat storage material and a preparation method thereof. Aluminum oxide serves as a base material; and a spherical metallic aluminum 'core' is enclosed by a layer of aluminum oxide 'enclosure'. In the process of heat storage, metallic aluminum can absorb heat to be changed from a solid state to a liquid state and the temperature of the metallic aluminum rises; at the same time, the external aluminum oxide layer also can absorb the heat, so that the temperature of the external aluminum oxide layer rises; and in the process of heat transfer, the liquid metallic aluminum releases both hidden heat and sensible heat and the aluminum oxide enclosure releases the sensible heat. The preparation process of the Al/Al2O3 heat storage material is obviously different from a conventional method, and comprises the following steps of: atomizing the liquid metallic aluminum (above 660 DEG C) into tiny particles with an atomizing device; and cooling the tiny liquid metallic aluminum particles in an oxidizing atmosphere and oxidizing the external aluminum oxide layer to form the Al/Al2O3 phase-change heat storage material taking the metallic aluminum as the 'core' and taking aluminum oxide as the 'enclosure', wherein the oxidizing atmosphere may adopt oxygen, water vapor, carbon dioxide or air diluted by an inert gas. The preparation method is simple and easy to realize large-scale production.

Description

Technical field [0001] One Al / Al 2 O 3 Heat storage materials belong to the technical field of application of energy saving and environmental protection. Background technique [0002] Thermal storage technology is one of the important means to solve the energy crisis and realize industrial energy saving. Its core application is to reconcile the contradiction between the supply and demand of thermal energy in time and space. Commonly used heat storage materials can be divided into sensible heat and latent heat. Sensible heat storage material has the advantages of stable performance and low price, but its heat storage density is low and the heat storage device is bulky. Phase change heat storage (latent heat storage) materials are used in many fields such as solar energy storage, industrial waste heat recovery, electronic device thermal management, etc. due to their high heat storage density, stable temperature during phase change, simple devices used, small size, and flexible des...

Claims

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Application Information

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IPC IPC(8): C09K5/06C09K5/14
Inventor 李孔斋王华祝星魏永刚胡建杭
Owner KUNMING UNIV OF SCI & TECH
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