Method for renewable aluminum alloy iron-rich phase metamorphism

An aluminum alloy and iron-rich technology, which is applied in the field of non-ferrous metal regeneration and recovery melt processing, can solve the problems of difficult purification and removal of impurity iron, iron increase, and easy sticking

Active Publication Date: 2017-11-24
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] There is an important problem in the production process of waste aluminum recycling: almost every recycling process of waste aluminum needs to be remelted, and the remelting process will cause different degrees of iron increase. Accumulat...

Method used

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  • Method for renewable aluminum alloy iron-rich phase metamorphism
  • Method for renewable aluminum alloy iron-rich phase metamorphism
  • Method for renewable aluminum alloy iron-rich phase metamorphism

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Melt 800g of ADC12 aluminum alloy in a crucible resistance furnace and raise the temperature to 745±5°C. 2.4 g of AlW were pressed into the melt. Stir vigorously with mechanical stirring for 20 minutes, the stirring rod is graphite, and the stirring speed is ≥350rpm. After the stirring is finished, the temperature starts to drop, and when the temperature drops to 730°C, 2.4g of helium wrapped in aluminum foil is added, stirred continuously with a graphite rod, and refined by degassing. Keep warm for 5 minutes, take out of the oven and cast.

Embodiment 2

[0029] Put 800g of 3104 aluminum alloy into a crucible resistance furnace to melt, and raise the temperature to 745±5°C. 2.4 g of AlW were pressed into the melt. Stir vigorously with mechanical stirring for 10 minutes, the stirring rod is graphite, and the stirring speed is ≥350rpm. When the holding time is up, the temperature starts to drop. When the temperature drops to 730°C, add 4.8g of helium wrapped in aluminum foil, stir continuously with a graphite rod, and degas and refine. Keep warm for 10 minutes, take out of the oven and cast.

Embodiment 3

[0031] Melt 800g of ADC12 aluminum alloy in a crucible resistance furnace and raise the temperature to 795±5°C. 2.4 g of AlW were pressed into the melt. And use mechanical stirring to vigorously stir for 30 minutes, the stirring rod is graphite, and the stirring speed is ≥350rpm. When the holding time is up, start to cool down. When the temperature drops to 760°C, add 3g of neon gas wrapped in aluminum foil, stir continuously with a graphite rod, and degas and refine. Keep warm for 5 minutes, take out of the oven and cast.

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Abstract

The invention discloses a method for renewable aluminum alloy iron-rich phase metamorphism. The invention adopts the technical scheme that the method comprises the steps of melting renewable aluminum alloy furnace burdens, and rising temperature to 740 to 800 DEG C; pressing W-containing intermediate alloy into a melt body, and then carrying out intensively stirring for 10 to 30 min, wherein the amount of W added into the melt body accounts for 0.05 to 0.3 weight percent of the mass of the melt body; after stirring, adding a refining agent at 730 to 760 DEG C, and then carrying out stirring, degassing, refining and slagging off; and carrying out stilling for 5 to 10 min with the temperature kept, and then carrying out discharging and casting. By utilizing the method, a form of an iron-rich phase can be improved, a needle-shaped iron-rich phase is eliminated, and a bone-shaped or Chinese script type iron-rich phase is refined, so that a renewable aluminum alloy structure is improved, a mechanical property and a processing property of the renewable aluminum alloy are improved, and the recovery rate of the aluminum alloy is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metal recycling melt treatment, and in particular relates to a method for modifying the iron-rich phase of a recycled aluminum alloy. Background technique [0002] There is an important problem in the production process of waste aluminum recycling: almost every recycling process of waste aluminum needs to be remelted, and the remelting process will cause different degrees of iron increase. Therefore, in the process of recycling waste aluminum, it will continue to accumulate and reach a very high content. [0003] The solid solubility of iron in aluminum is very low, and the iron-rich phase is more likely to be in the form of needle-like β (Al 5 FeSi) appears in the aluminum alloy structure. This phase is coarse and flaky in three dimensions, which is both hard and brittle. It forms a source of stress concentration, severely splits the aluminum matrix, and reduces the mechanical properties of ...

Claims

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Application Information

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IPC IPC(8): C22C1/06C22C21/00
CPCC22C1/06C22C21/00
Inventor 白培康张文达冯英豪刘斌任霁萍
Owner ZHONGBEI UNIV
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