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A kind of grain refiner of secondary aluminum alloy and its preparation method and application

A grain refiner, aluminum alloy technology, applied in the field of aluminum alloy to achieve the effects of improving casting fluidity, tensile strength and elongation

Active Publication Date: 2021-11-19
GUANGDONG ENG POLYTECHNIC COLLEGE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the existing grain refiners for secondary aluminum alloys still need to be improved and developed.

Method used

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  • A kind of grain refiner of secondary aluminum alloy and its preparation method and application
  • A kind of grain refiner of secondary aluminum alloy and its preparation method and application
  • A kind of grain refiner of secondary aluminum alloy and its preparation method and application

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Effect test

preparation example Construction

[0056] The preparation method of the secondary aluminum alloy grain refiner provided by the present invention comprises the following steps:

[0057] The first step: according to the mass percentage composition of the grain refiner, aluminum ingots, titanium powder, nickel powder and carbon powder are selected as raw materials;

[0058] Step 2: Mix nickel powder and part of carbon powder and press to form a prefabricated block composed of nickel powder and carbon powder;

[0059] The third step: mixing and pressing titanium powder and carbon powder into a prefabricated block composed of titanium powder and carbon powder;

[0060] Step 4: Heat the aluminum ingot at 890-910°C to melt the molten aluminum;

[0061] Step 5: Add the prefabricated block composed of nickel powder and carbon powder into the molten aluminum and react for 10 to 15 minutes to obtain an aluminum-nickel-carbon alloy liquid;

[0062] Step 6: Add the prefabricated block composed of titanium powder and carbo...

Embodiment 1

[0087] The grain refiner of secondary aluminum alloy is composed of the following components by mass percentage: Ti 4.0%, Ni 1.0%, C0.8%, Fe 0.14%, the balance is Al and other unavoidable impurity elements, other impurity elements Individual content ≤ 0.05%, total ≤ 0.15%.

[0088] The preparation method of the grain refiner comprises the following steps in sequence:

[0089] The first step: according to the mass percentage composition of the grain refining agent, select aluminum ingot with an aluminum content of 99.7%, titanium powder with a titanium content of 99.9% and a particle size of ≤100 microns, a nickel content of 99.9% and a grain size Nickel powder with a diameter of ≤100 microns and carbon powder with a carbon content of 99.9% and a particle size of ≤50 microns are used as raw materials;

[0090] Step 2: Stir and mix nickel powder and part of carbon powder in a mixer for 1 hour at a mass ratio of 4.7:1, then put the mixed nickel powder and carbon powder into a me...

Embodiment 2

[0098] The grain refiner of secondary aluminum alloy is composed of the following components by mass percentage: Ti 4.2%, Ni 0.9%, C 0.9%, Fe 0.11%, the balance is Al and other unavoidable impurity elements, other impurity elements Individual content ≤ 0.05%, total ≤ 0.15%.

[0099] The preparation method of the grain refiner of the recycled aluminum alloy comprises the following steps:

[0100] The first step: according to the mass percentage composition of the grain refining agent, select aluminum ingot with an aluminum content of 99.85%, titanium powder with a titanium content of 99.9% and a particle size of ≤80 microns, a nickel content of 99.9% and a grain size Nickel powder with a diameter of ≤70 microns and carbon powder with a carbon content of 99.9% and a particle size of ≤30 microns are used as raw materials;

[0101] Step 2: Stir and mix nickel powder and part of carbon powder in a mixer for 2 hours at a mass ratio of 4.8:1, then put the mixed nickel powder and car...

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Abstract

The invention discloses a grain refiner for recycled aluminum alloys, a preparation method and application thereof, and belongs to the technical field of aluminum alloy grain refiners. The grain refiner is composed of the following components by mass percentage: Ti 3.8-4.2%, Ni0.9-1.1%, C 0.7-0.9%, Fe≤0.15%, the balance is Al and other unavoidable impurity elements , the individual content of other impurity elements is ≤0.05%, and the total content is ≤0.15%. The refiner of the present invention contains TiC particles and NiC particles at the same time, and through the compound refinement effect of TiC particles and NiC particles on α-Al grains, the α-Al grains of the recycled aluminum alloy can be transformed from coarse dendritic to fine The uniform equiaxed or near-spherical shape solves the problem of difficult grain refinement of secondary aluminum alloys, and is conducive to improving the casting performance and mechanical properties of secondary aluminum alloys.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloys, and in particular relates to a grain refiner for recycled aluminum alloys and a preparation method and application thereof. Background technique [0002] Secondary aluminum alloys are aluminum alloys prepared by smelting scrap aluminum. The casting fluidity and mechanical properties of secondary aluminum alloys are closely related to the shape and size of α-Al grains inside. During the casting process, if α-Al The grains are thick and dendritic, and the thick and dendritic α-Al grains will overlap each other to form a network, which seriously hinders the casting flow and filling of the recycled aluminum alloy liquid, resulting in incomplete filling of recycled aluminum alloy castings, making it difficult to obtain shapes that meet the requirements Recycled aluminum alloy castings, and lead to structural defects such as porosity and holes inside the recycled aluminum alloy castings, furthe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/10C22C21/00C22C21/02C22C32/00
CPCC22C1/1036C22C21/003C22C21/02C22C32/0052C22C1/1052
Inventor 陈学文王顺成曹立生付亚城戴丽娟
Owner GUANGDONG ENG POLYTECHNIC COLLEGE
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