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Al-Strontium Alloy Modifier Applicable to Cast Al-Si Alloy
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A technology for 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, increased burning loss of infiltration method cost, etc., so as to improve yield, reduce production cost, reduce The effect of high temperature oxidation loss
Active Publication Date: 2017-05-03
WUHU YONGYU AUTOCAR INDAL
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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
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Embodiment 1
[0049] 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.
[0050] The preparation process of the aluminum-strontium alloy modifier of the present embodiment comprises the following steps:
[0051] (1) Ingredients process;
[0052] According to the percentage by weight: 5% strontium, 6% silicon, and the balance being aluminum, weigh aluminum-silicon alloy powder and strontium powder;
[0053] (2) Melting process;
[0054] 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;
[0055] (3) Al-Si melt purification process;
[0056] 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 a...
Embodiment 2
[0072] 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.
[0073] The preparation process of the aluminum-strontium alloy modifier of the present embodiment comprises the following steps:
[0074] (1) Ingredients process;
[0075] 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 an aluminum-strontium alloy modifier suitable for casting aluminum-silicon alloys. The aluminum-strontium alloy modifier comprises the chemical components in percentage by weight: 4-6% of strontium, 5-7% of silicon and the balance of aluminum. According to the aluminum-strontium alloy modifier, the silicon is added, so that the alloy melting temperature can be reduced; the aluminum-strontium alloy melting temperature is reduced by about 100 DEG C; the melting temperature can be reduced to 750-800 DEG C during production; the melting temperature during production of aluminum-strontium two-component alloys is greatly reduced by 830-900 DEG C; the melting temperature is reduced, so that the high-temperature oxidization loss of the strontium is reduced; the yield of the strontium is increased; the production cost of the modifier is reduced; the modification performance of the aluminum-strontium alloy is not influenced.
Description
technical field [0001] The invention belongs to the technical field of alloy metal materials. Specifically, the invention relates to 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, the cast aluminum-silicon alloy usually adopts modification treatment to change the shape and size o...
Claims
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