High-temperature antioxidant heat storage aluminum alloy

A high-temperature anti-oxidation and aluminum alloy technology, which is applied in the field of aluminum alloys, can solve the problems of high-temperature oxidation of heat-storing aluminum alloys, achieve good thermal stability, improve high-temperature oxidation resistance, and require less equipment and test conditions

Inactive Publication Date: 2013-07-24
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the serious problem of high temperature oxidation of existing heat storage aluminum alloys, and to provide a high temperature oxidation resistant heat storage aluminum alloy

Method used

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  • High-temperature antioxidant heat storage aluminum alloy

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Experimental program
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Effect test

Embodiment 1

[0031] The chemical composition and content by weight percentage of the high-temperature anti-oxidation heat storage aluminum alloy of the present invention are: Si: 12.0%, Mg: 2.0%, Cu: 15.0%, and the balance is Al. Using SG 2 - 5-12 crucible furnaces for melting. The raw materials used mainly include Al-20%Si alloy, Al-50%Cu master alloy, industrial pure aluminum and pure magnesium. When smelting, first add Al-20%Si alloy, pure Al and Al-50%Cu alloy, raise the temperature to 750°C, after the melting is complete, cool down to 690°C, stir slightly, and press in pure Mg with a pressure spoon. Incubate at 720°C for 10 minutes. Stir the alloy liquid again, and use a metal mold to cast it into a cylindrical rod-shaped sample with a diameter of 30 mm and a length of 100 mm. its coagulated tissue see figure 1 . Its phase transition latent heat value is 509.4μV·s / mg, and the phase transition temperature range is 507.1-556.5°C.

Embodiment 2

[0033] The chemical composition and content by weight percentage of the high-temperature anti-oxidation heat storage aluminum alloy of the present invention are: Si: 12.0%, Mg: 2.0%, Cu: 15.0%, RE: 0.1%, and the balance is Al. Using SG 2 - 5-12 crucible furnaces for melting. The raw materials used mainly include Al-20%Si alloy, Al-50%Cu master alloy, Al-10%RE master alloy, industrial pure aluminum and pure magnesium. When smelting, first add Al-20%Si alloy, pure Al and Al-50%Cu alloy, raise the temperature to 750°C, after the melting is complete, cool down to 690°C, stir slightly, and press in pure Mg with a pressure spoon. After the Mg is melted, raise the temperature to 750°C, let stand for 5 minutes, and stir evenly. Then, add the industrial Al-10%RE master alloy, stir evenly, and keep it at 720°C for 10min. Stir the alloy liquid again, and use a metal mold to cast it into a cylindrical rod-shaped sample with a diameter of 30 mm and a length of 100 mm. its coagulated ti...

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Abstract

The invention discloses a high-temperature antioxidant heat storage aluminum alloy, which aims to overcome the problem of high-temperature easy oxidation of heat storage aluminum alloy. The heat storage aluminum alloy comprises the following components by weight percent: 10.0-14.0 percent of Si (silicon), 1.0-4.0 percent of Mg (magnesium), 10.0-20.0 percent of Cu (copper), 0-0.5 percent of RE (rear earth) and the balance of Al (aluminum); the heat storage aluminum alloy has good comprehensive performance, especially higher oxidation resistance, due to the addition of trace mixed rare earth elements; the oxidation kinetics curve is coincident with the parabolic law based on 650-DEG C quasi-isothermal oxidation experiments and the oxidation time of less than 250 hours and shows that the oxidant film has better protection; after 150 thermal circulations, the latent heat of phase change is maximally reduced only by 3.53 percent, the starting phase change temperature is just reduced by 0.1 DEG C, the final phase change temperature is just increased by 3.1 DEG C, and therefore the heat storage aluminum alloy shows better thermal stability. The heat storage aluminum alloy has good high-temperature oxidation resistance, simple melting process, and is easily achieved industrial production; and the raw materials of the alloy are rich and obtained easily.

Description

technical field [0001] The invention relates to an aluminum alloy, and more specifically, the invention relates to a high-temperature oxidation-resistant heat-storage aluminum alloy. Background technique [0002] Solar thermal power generation is an important way to develop and utilize solar energy on a large scale and alleviate the energy crisis. In order to ensure the all-weather continuous and stable operation of solar power plants, improve power generation efficiency, and reduce power generation costs, solar thermal power generation systems generally use heat storage technology. At present, there are many kinds of heat storage materials that can be applied in solar thermal power generation. Compared with molten salt, heat storage aluminum alloy has the advantages of high thermal conductivity, small phase change volume change, large heat storage density, non-toxic, and moderate price. However, under high-temperature service conditions, some heat storage aluminum alloys ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/02C22C1/03
Inventor 于思荣许骏张潇华刘恩洋
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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