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Modified hypereutectic aluminum silicon alloy and preparation method thereof

An aluminum-silicon alloy and hypereutectic technology, which is applied in the field of metamorphic hypereutectic aluminum-silicon alloy and its preparation, can solve the problems of incapable of metamorphic Si phase, poisoning of alloy structure, etc., and achieves a simple and easy to operate preparation method, high resistance to The effect of tensile strength, elongation, and high plasticity

Active Publication Date: 2017-03-22
甘肃兰亚铝业有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, phosphorus salts and sodium salts used in large quantities have obvious modification effects on hypereutectic aluminum-silicon alloys, but they can only modify primary Si and eutectic Si structures respectively. The tissue produces poisoning effect and cannot achieve the effect of modifying the Si phase

Method used

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  • Modified hypereutectic aluminum silicon alloy and preparation method thereof
  • Modified hypereutectic aluminum silicon alloy and preparation method thereof
  • Modified hypereutectic aluminum silicon alloy and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] (1) Mix industrial aluminum ingots and industrial crystalline silicon into the Si-C rod crucible furnace, heat at 780°C until completely melted, and then hold at 760°C for 9 minutes to obtain a melt;

[0035] (2) When the melt in step (1) is cooled to 750°C, the C 2 Cl 6 (C 2 Cl 6 The added amount is 0.7% of the mass of the melt) wrapped with aluminum foil and pressed into the melt, stirred and refined, deslagging and degassing, and poured into a metal mold at 710°C for solidification after slag removal to form a hypereutectic Aluminum silicon alloy 1;

[0036] (3) Melt the hypereutectic aluminum-silicon alloy in step (2) at a temperature of 800°C, add mixed rare earths, and stir once every 5 minutes until the mixed rare earths are completely melted, then keep it at 780°C for 25 minutes to obtain metamorphic Hypereutectic Al-Si Alloy 1.

[0037] In step (3), the mixed rare earth includes light rare earth and heavy rare earth, and the mass ratio of light rare earth ...

Embodiment 2

[0040] (1) Mix industrial aluminum ingots and industrial crystalline silicon into a Si-C rod crucible furnace, heat at 800°C until completely melted, and then hold at 740°C for 11 minutes to obtain a melt;

[0041] (2) When the melt in step (1) is cooled to 700°C, the C 2 Cl 6 (C 2 Cl 6 The added amount is 0.9% of the mass of the melt) wrapped with aluminum foil and pressed into the melt, stirred and refined, deslagging and degassing, and poured into a metal mold at 720°C for solidification after slag removal to form a hypereutectic Aluminum silicon alloy 2;

[0042] (3) Melt the hypereutectic aluminum-silicon alloy in step (2) at a temperature of 780°C, add mixed rare earths, and stir once every 6 minutes until the mixed rare earths are completely melted, then keep warm at 760°C for 35 minutes to obtain metamorphic Hypereutectic Al-Si Alloy 2.

[0043] In step (3), the mixed rare earths include light rare earths and heavy rare earths, and the mass ratio of the light rare...

Embodiment 3

[0046] (1) Mix industrial aluminum ingots and industrial crystalline silicon into a Si-C rod crucible furnace, heat at 800°C until completely melted, and then hold at 740°C for 11 minutes to obtain a melt;

[0047] (2) When the melt in step (1) is cooled to 700°C, the C 2 Cl 6 (C 2 Cl 6 The addition amount is 0.8% of the mass of the melt) covered with aluminum foil and pressed into the melt, stirred and refined, deslagging and degassing, and poured into a metal mold at 720°C for solidification after slag removal to form a hypereutectic Aluminum silicon alloy 3;

[0048](3) Melt the hypereutectic aluminum-silicon alloy in step (2) at a temperature of 780°C, add mixed rare earths, and stir once every 5 minutes until the mixed rare earths are completely melted, then keep it at 760°C for 30 minutes to obtain a metamorphic Hypereutectic Al-Si Alloy3.

[0049] In step (3), the mixed rare earth includes light rare earth and heavy rare earth, and the mass ratio of light rare eart...

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Abstract

The invention discloses modified hypereutectic aluminum silicon alloy and a preparation method thereof. Aluminum and crystalline silicon padding are molten to obtain melt, refining casting is carried out on the melt, and hypereutectic aluminum silicon alloy is obtained. Finally, the hypereutectic aluminum silicon alloy is modified through mixed rare earth, and the modified hypereutectic aluminum silicon alloy is obtained. The mixed rare earth is composed of light rare earth and heavy rare earth, and the mass ratio between the light rare earth and the heavy rare earth is (3-7): (7-3). The modified hypereutectic aluminum silicon alloy comprises 18wt.%-22wt.% of the silicone element, 0.8wt.%-1.2wt.% of mixed rare earth, and the balance aluminum. The plasticity of the modified hypereutectic aluminum silicon alloy is higher, and higher tensile strength and ductility can be realized and are 143 MPa and 2.79% respectively. The preparation method is simple and easy to operate.

Description

technical field [0001] The invention belongs to the technical field of modification of hypereutectic aluminum-silicon alloy, and in particular relates to a modified hypereutectic aluminum-silicon alloy and a preparation method thereof. Background technique [0002] Due to its good thermal conductivity, low density, low thermal expansion coefficient and good fluidity, hypereutectic aluminum-silicon alloy is used as an ideal substitute material for traditional cast iron to produce automotive engine pistons, cylinder heads and other parts. Reduce self-weight, reduce fuel consumption, and achieve the purpose of energy saving and environmental protection. However, in the traditionally cast hypereutectic aluminum-silicon alloy, there are coarse massive, irregular five-lobed star-shaped primary Si and coarse needle-like eutectic Si, which are distributed on the alloy matrix, severely splitting the continuity of the matrix, and There is stress concentration at the tip, which reduce...

Claims

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Application Information

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IPC IPC(8): C22C21/04C22C1/02C22C1/06
CPCC22C1/026C22C1/06C22C21/04
Inventor 李庆林李斌强李进宝张建斌兰晔峰
Owner 甘肃兰亚铝业有限公司
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