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A method for refinement and modification of aluminum alloy

A technology for modification treatment and refinement of modifying agents, applied in the field of aluminum alloy preparation, can solve problems such as the inability to meet the strength requirements of aluminum alloys, achieve excellent refining effect, excellent wear resistance, and avoid aggregation and segregation.

Active Publication Date: 2018-10-23
HEFEI CITY TENVER PRECISION CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the tensile strength and elongation of A356 aluminum alloy after refinement and modification are about 250Mpa and 6.2%, respectively, which are far from meeting the strength requirements of aluminum alloys in some fields. Deterioration treatment method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A method for refinement and modification of aluminum alloys, comprising the following steps:

[0017] (1) In parts by weight, after mixing 20 parts of lanthanum powder, 10 parts of barium fluoride and 90 parts of pure aluminum, heating until the aluminum is completely melted, stirring vigorously, and cooling to room temperature to obtain refinement modifier A;

[0018] (2) Put the titanium powder in a vacuum chamber, pass silane gas into it, heat the temperature in the vacuum chamber to 390°C, keep the temperature for 5 hours, finish the reaction, and prepare the refinement modifier B after cooling down to room temperature;

[0019] (3) After heating the aluminum alloy to a molten state for 10 minutes, first add refinement modifier A to it, stir evenly, and keep it warm for 15 minutes, then add refinement modifier B to it, stir it evenly, keep it warm for 20 minutes, and carry out Pouring to make the finished product.

[0020] Specifically, the above-mentioned lanthanu...

Embodiment 2

[0024] A method for refinement and modification of aluminum alloys, comprising the following steps:

[0025] (1) In parts by weight, after mixing 23 parts of lanthanum powder, 12 parts of barium fluoride and 95 parts of pure aluminum, heat until the aluminum is completely melted, stir vigorously, and cool to room temperature to obtain a refinement modifier A;

[0026] (2) Put the titanium powder in a vacuum chamber, pass silane gas into it, heat the temperature in the vacuum chamber to 410°C, keep the temperature for 6 hours, finish the reaction, and prepare the refinement modifier B after cooling down to room temperature;

[0027] (3) After heating the aluminum alloy to the molten state for 15 minutes, first add refinement modifier A to it, stir evenly, keep warm for 17 minutes, then add refiner B, stir well, keep warm for 25 minutes, and carry out Pouring to make the finished product.

[0028] Specifically, the above-mentioned lanthanum powder has a purity of 99.5%, the abo...

Embodiment 3

[0032] A method for refinement and modification of aluminum alloys, comprising the following steps:

[0033] (1) In parts by weight, mix 25 parts of lanthanum powder, 14 parts of barium fluoride, and 100 parts of pure aluminum, heat until the aluminum is completely melted, stir vigorously, and cool to room temperature to obtain the refinement modifier A;

[0034] (2) Put the titanium powder in a vacuum chamber, pass silane gas into it, heat the temperature in the vacuum chamber to 420°C, keep the temperature for 7 hours, end the reaction, and after cooling down to room temperature, prepare the refinement modifier B;

[0035] (3) After heating the aluminum alloy to the molten state for 20 minutes, first add refinement modifier A to it, stir evenly, keep warm for 20 minutes, then add refiner B, stir well, keep warm for 30 minutes, and carry out Pouring to make the finished product.

[0036] Specifically, the above-mentioned lanthanum powder has a purity of 99.5%, the above-ment...

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Abstract

The invention discloses an aluminum alloy refinement and modification treating method. The aluminum alloy refinement and modification treating method comprises the following operation steps that (1) lanthanum powder, barium fluoride and pure aluminum are mixed and then heated until the aluminum is melted entirely, and is cooled to room temperature after be stirred powerfully, and a refinement and modification agent A is prepared; (2) titanium powder is placed in a vacuum chamber, gas silicon hydride is injected into the vacuum chamber, the temperature of the vacuum chamber is heated to 390-420 DEG C, warm is kept for 5-7 hours, reaction is finished, the temperature is lowered down to the room temperature, and a refinement and modification agent B is prepared; and (3) aluminum alloy is heated to a melting status, the refinement and modification agent A is added in first, after even stirring, the refinement and modification agent B is added, after stirred evenly, pouring is conducted, and a finished product is prepared. According to the aluminum alloy refinement and modification treating method, operation is simple, the prepared aluminum alloy finished product is good in anti-corrosion performance, compared with the prior art, the extension strength and elongation percentage are improved significantly.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy preparation, and in particular relates to a method for refinement and modification of aluminum alloys. Background technique [0002] Aluminum alloy is the most widely used non-ferrous metal structural material in industry, and has been widely used in aviation, aerospace, automobile, machinery manufacturing, shipbuilding and chemical industry. With the rapid development of industrial economy, the demand for welded structural parts of aluminum alloy is increasing day by day, so that the research on weldability of aluminum alloy is also in-depth. Aluminum alloy is currently the most widely used alloy. With the development of modern science and technology, people have higher and higher requirements for the performance of aluminum alloys. Whether a fine and uniform microstructure can be obtained becomes the key factor to control the performance of the product. Refining and modifying treatment i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02C22C21/00
CPCC22C1/026C22C21/003
Inventor 孙爱琴
Owner HEFEI CITY TENVER PRECISION CASTING