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A Grain Refining Method for Preventing Silicon Poisoning of Al-Si Alloy

A technology of aluminum-silicon alloy and grain refinement, which is applied in the application field of metal materials and can solve problems such as poisoning, poor fine-grain effect of aluminum-silicon alloy, and weakened performance of fine-grain

Active Publication Date: 2021-07-02
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the silicon concentration is greater than 5wt.%, the fine-grain efficiency of the traditional AlTiB refiner is significantly weakened, which is the silicon poisoning effect
Due to the influence of silicon poisoning, traditional aluminum-titanium-boron refining agents have poor grain refinement effects on aluminum-silicon alloys. Therefore, this patent provides a grain refinement method to prevent silicon poisoning of aluminum-silicon alloys. Before "silicon poisoning" occurs Introduce the titanium diboride heterogeneous core wrapped by aluminum atoms as an effective crystal embryo, thereby improving the fine-grained effect

Method used

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  • A Grain Refining Method for Preventing Silicon Poisoning of Al-Si Alloy
  • A Grain Refining Method for Preventing Silicon Poisoning of Al-Si Alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A method for refining grains for preventing silicon poisoning of aluminum-silicon alloy, the steps are as follows:

[0018] (1) Put 99 grams of aluminum ingots with a purity of 99.95% into a crucible, then put them into a well furnace and heat up to 800°C to melt, add 1 gram of aluminum five titanium one boron refining agent, and stir evenly; Place a high-purity silica glass container inside.

[0019] (2) using argon gas with a purity of 99.5% for refining and degassing, and removing scum;

[0020] (3) Pour the molten aluminum mixed with refiner into step (1) high-purity silica glass container, keep the temperature at 800°C, and continuously stir and mix the melt during this process;

[0021] (4) Control the stepwise cooling rate of molten aluminum in step (3). For the first 2 hours, the temperature drops by 10°C, 15°C, 15°C, and 20°C every 30 minutes; after that, the temperature drops by 20°C every 30 minutes, and cools to 600°C after a total of 9 hours, and then air...

Embodiment 2

[0026] A method for refining grains for preventing silicon poisoning of aluminum-silicon alloy, the steps are as follows:

[0027] (1) Put 98 grams of aluminum ingots with a purity of 99.95% into a crucible, then put them into a well furnace and heat up to 800°C to melt, add 2 grams of aluminum five titanium one boron refiner, and stir evenly; Place a high-purity silica glass container inside.

[0028] (2) using argon gas with a purity of 99.5% for refining and degassing, and removing scum;

[0029] (3) Pour the molten aluminum mixed with refiner into step (1) high-purity silica glass container, keep the temperature at 800°C, and continuously stir and mix the melt during this process;

[0030] (4) Control the stepwise cooling rate of molten aluminum in step (3). For the first 2 hours, the temperature drops by 10°C, 15°C, 15°C, and 20°C every 30 minutes; after that, the temperature drops by 20°C every 30 minutes, and cools to 600°C after a total of 9 hours, and then air-cools...

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Abstract

The invention belongs to the technical field of metal material application, and relates to a grain refinement method for preventing silicon poisoning of an aluminum-silicon alloy. The silicon content of the aluminum-silicon alloy described in the present invention is 5-11wt.%. Due to the silicon poisoning effect, it is difficult to use traditional titanium-boron-based refiners to refine the grains. In the present invention, a large number of nucleation embryos with a refiner as the core that wrap aluminum atoms are formed by adding a refiner to high-purity aluminum in advance, and then add silicon to diffuse into the aluminum liquid to form an aluminum-silicon alloy, thereby avoiding the combination of silicon and titanium. The "silicon poisoning effect" occurs, which can effectively refine the grains and play the role of fine grain strengthening.

Description

technical field [0001] The invention belongs to the technical field of metal material application, and relates to a grain refinement method for preventing silicon poisoning of an aluminum-silicon alloy. Background technique [0002] Cast aluminum-silicon alloy is an important class of lightweight materials, which are widely used in the manufacture of thin-walled automotive body parts, engine components, transmission system components, complex-shaped radiators, oil pipelines, etc. Without any treatment, the coarse α-Al dendrites and a large number of brittle Al-Si eutectic structures in Al-Si alloys will greatly weaken the strength and plasticity of the alloys, which limits their applications in the transportation and aerospace industries. In order to improve the strength and plasticity, people have adopted a variety of methods to refine the aluminum-silicon alloy. By adding a refiner alloy containing heterogeneous nucleation particles to regulate the nucleation and growth of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/06C22C1/02
CPCC22C1/026C22C1/06
Inventor 李发国谢颖胡孝愿
Owner XIANGTAN UNIV