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Preparation process of aluminum-strontium alloy modifier suitable for casting aluminum-silicon alloy

A technology of casting aluminum-silicon alloy and aluminum-strontium alloy, which is applied in the field of alloy metal materials, can solve the problems of high price, complicated equipment, high temperature, etc., and achieve the effects of increasing yield, reducing melting temperature, and reducing production cost

Active Publication Date: 2016-08-24
WUHU YONGYU AUTOCAR INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the high melting point of aluminum-strontium alloy, the temperature for producing aluminum-strontium alloy by infiltration method is as high as 900°C, and the burning loss of strontium is serious, and the loss ratio is as high as 20% to 35%.
Strontium metal is a very active alkaline earth metal. Its chemical activity is between that of calcium and barium. The production of strontium metal is mostly by vacuum thermal reduction method, with complex equipment, strict process conditions, low output and high cost. higher price
In this way, the cost of infiltration method increases a lot due to the burning loss of strontium

Method used

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  • Preparation process of aluminum-strontium alloy modifier suitable for casting aluminum-silicon alloy
  • Preparation process of aluminum-strontium alloy modifier suitable for casting aluminum-silicon alloy
  • Preparation process of aluminum-strontium alloy modifier suitable for casting aluminum-silicon alloy

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Embodiment 1

[0075] The chemical composition of the aluminum-strontium alloy modifier in this embodiment is calculated by weight percentage: 5% strontium, 6% silicon, and the rest is aluminum, and the modified agent is AlSr5.

[0076] The preparation process of the aluminum-strontium alloy modifier of the present embodiment comprises the following steps:

[0077] (1) Ingredients process;

[0078] According to the percentage by weight: 5% strontium, 6% silicon, and the balance being aluminum, weigh aluminum-silicon alloy powder and strontium powder;

[0079] (2) Melting process;

[0080] Melting the aluminum-silicon alloy, the melting temperature is preferably 750°C, and slagging and removing the slag after melting to obtain a clean aluminum-silicon melt;

[0081] (3) Al-Si melt purification process;

[0082] Add a sodium-free slag cleaning agent accounting for 1.5‰ of the total weight to the aluminum-silicon melt, and remove the slag in the aluminum-silicon melt after fully stirring, so...

Embodiment 2

[0098] The chemical composition of the aluminum-strontium alloy modifier in this embodiment is calculated by weight percentage: 6% strontium, 6% silicon, and the rest is aluminum. In the preparation process of aluminum-strontium alloy modifier, ultrasonic stirring can be used to fully stir the alloy components evenly, and ultrasonic local pore cavitation and instantaneous pore local overheating can be used to obtain superheated phases Al4Sr and Al2Sr phases, such as figure 2 shown. These phases can further refine the phase structure of the cast aluminum-silicon alloy more effectively, and obtain a metallographic structure smaller than 80 μm, such as image 3 shown.

[0099] The preparation process of the aluminum-strontium alloy modifier of the present embodiment comprises the following steps:

[0100] (1) Ingredients process;

[0101] According to weight percentage: strontium 6%, silicon 6%, the balance is aluminum, weigh aluminum-silicon alloy powder and strontium powder...

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Abstract

The invention discloses a preparation technique of an aluminum-strontium alloy modifier for casting aluminum-silicon alloy, which comprises the following steps: proportioning, smelting, aluminum-silicon melt purification, argon protection, strontium addition alloying, refining and standing. By using the aluminum-silicon alloy instead of electrolytic aluminum in the traditional technique, the preparation technique can lower the melting temperature, lowers the smelting temperature of the aluminum-strontium alloy by 100 DEG C or so, lowers the alloying temperature, and can lower the smelting temperature to 750-800 DEG C during production, which is much lower than the smelting temperature of 830-900 DEG C in the aluminum-strontium two-element alloy production process. The lowering of the smelting temperature can reduce the high-temperature oxidation loss of strontium and enhance the strontium yield. The strontium price is 50000 yuan per ton, thereby lowering the production cost of the modifier without influencing the modification properties of the aluminum-strontium alloy.

Description

technical field [0001] The invention belongs to the technical field of alloy metal materials. Specifically, the invention relates to a preparation process of an aluminum-strontium alloy modifier suitable for casting aluminum-silicon alloys. Background technique [0002] Cast aluminum-silicon alloy has the advantages of low density, high strength, wear resistance, good heat resistance, and low thermal expansion coefficient, so it is a type of alloy with the widest application range and the largest output among cast aluminum alloys. However, with the increase of silicon content in aluminum-silicon alloys, a large amount of acicular eutectic silicon appears in the structure, and even coarse multi-angle block primary silicon appears, which severely splits the matrix and significantly reduces the mechanical properties of the alloy, especially the plastic properties. Machinability deteriorates. Therefore, casting aluminum-silicon alloys usually use modification treatment to chang...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/04C22C21/00C22C1/03C22C1/06
CPCC22C1/026C22C1/03C22C1/06C22C21/00C22C21/04
Inventor 郑志勋
Owner WUHU YONGYU AUTOCAR INDAL