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Crystal grain refining agent for aluminum or aluminum alloy

A technology of grain refiner and aluminum alloy, which is applied in the field of grain refiner, can solve problems such as cracks, unclear precise mechanism of grain refinement, banded defects on the surface of bright anode materials, etc., to achieve grain refinement obvious effect

Inactive Publication Date: 2018-09-11
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This new type of material can be applied during manufacturing processes that improve metal's quality by reducing impurities such as iron (Fe) from molten metals.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the performance of certain types of metal materials during their production processes due to impurities that may be present therein (grains). Grainy metals can form small holes called pits if left untreated over time without being completely removed from the final products made with them. These tiny open spaces could lead to reduced strength and durability compared to regular ingots produced at high temperatures. Therefore, these fine crystalline structures should ideally be eliminated beforehand.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Use a graphite crucible to melt 200g of industrial pure aluminum ingot and heat it to above 800°C for a period of time. After the molten aluminum cools down to 700-720°C, add Al-0.5Er-0.1Zr refiner. The adding amount of refiner is 50g. Stir well, let it stand for 3-5 minutes, wait for the molten aluminum to drop to 680°C, pour it into a mold, and cool it to room temperature in air. After adding the refiner, it can be observed that the grain refinement effect of the cast sample is remarkable, and the average grain size is refined to 400 μm.

Embodiment 2

[0014] Use a graphite crucible to melt 200g of industrial pure aluminum ingot and heat it to above 800°C for a period of time. After the molten aluminum cools down to 700-720°C, add Al-1Er-1Zr refiner. The addition amount of refiner is 22.2g. Stir well, let it stand for 3-5 minutes, wait for the molten aluminum to drop to 680°C, pour it into a mold, and cool it to room temperature in air. After adding the refiner, it can be observed that the grain refinement effect of the cast sample is remarkable, and the average grain size is refined to 500 μm.

Embodiment 3

[0016] Use a graphite crucible to melt 200g of industrial pure aluminum ingot and heat it to above 800°C for a period of time. After the molten aluminum cools down to 700-720°C, add Al-5Er-5Zr refiner. The addition amount of refiner is 4.1g. Stir well, let it stand for 3-5 minutes, wait for the molten aluminum to drop to 680°C, pour it into a mold, and cool it to room temperature in air. After adding the refiner, it can be observed that the grain refinement effect of the cast sample is remarkable, and the average grain size is refined to 500 μm.

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Abstract

The invention relates to a crystal grain refining agent for aluminum or aluminum alloy, and belongs to the technical field of the crystal grain refining agent. An aluminum alloy refining agent uses aluminum as a base body; the content of Er in the aluminum alloy refining agent is 0.5 to 10 weight percent; the Zr content is 0.1 to 10 weight percent; the content of other elements is 0 to 5 weight percent; other elements include but are not limited to one or several kinds of materials in Fe, Si, Cu, Mg, Mn, Zn, Ti, Cr, B and C; the balance of Al. The refining agent containing Er and Zr elements has the obvious crystal grain refining effects on the aluminum alloy; the adverse effects caused by infusible TiB2 particles in the Al-Ti-B refining agents cannot occur.

Description

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Claims

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Application Information

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Owner BEIJING UNIV OF TECH
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