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A kind of composite modifier for deep modification of eutectic silicon and preparation method thereof

A composite modifier and composite modification technology, applied in the field of cast aluminum alloys, can solve the problems of no obvious eutectic silicon morphology, limiting the improvement of the plasticity of Al-Si alloy cast aluminum alloys, etc.

Active Publication Date: 2021-12-10
GUANGDONG INST OF NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The lanthanum boride, Al-Ti-B and Al-RE in the above two patents are mainly used to refine α-Al, but have no obvious effect on further improving the morphology of eutectic silicon, which limits the casting of Al-Si alloys Improvement of plasticity of aluminum alloy

Method used

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  • A kind of composite modifier for deep modification of eutectic silicon and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] This implementation provides a composite modifier for deep modification of eutectic silicon, which includes 5.0% Sr, 9.0% Ce and 86.0% Al in terms of mass percentage, and inevitable impurity elements;

[0040] The compound modificator is prepared by the following method:

[0041] S1: put commercially pure aluminum into the melting furnace, raise the temperature to 750°C, and after it is completely melted, add a covering agent of 0.02% of the mass of the melt, and then press Al-10Sr and Al-20Ce into the melt with a bell jar made of Ti;

[0042] S2: Raise the temperature to 850°C. After the raw materials are completely melted, take a sample to test the components; then pass high-purity argon gas with a purity of 99.99% into the melt for 10 minutes;

[0043] S3: After the melt is left to stand for 30 minutes, the slag is removed, and cast to a semi-continuous casting machine to prepare a cylindrical ingot with a diameter of 110 mm;

[0044] S4: After the cast ingot is coo...

Embodiment 2

[0046] This implementation provides a composite modifier for deep modification of eutectic silicon, which includes 8.0% Sr, 15% La and 77.0% Al in terms of mass percentage, and unavoidable impurity elements;

[0047] The compound modificator is prepared by the following method:

[0048] S1: put commercially pure aluminum into the melting furnace, raise the temperature to 800°C, after it is completely melted, add 0.02% covering agent of the mass of the melt, and then use a bell jar made of Ti to press metal Sr and metal La into the melt;

[0049] S2: Raise the temperature to 900°C, and after the raw materials are completely melted, take samples to test the components; then pass high-purity argon gas with a purity of 99.99% into the melt for 10 minutes;

[0050] S3: After the melt is left to stand for 15 minutes, the slag is removed, and cast to a semi-continuous casting machine to prepare a cylindrical ingot with a diameter of 210 mm;

[0051] S4: After the ingot is cooled, th...

Embodiment 3

[0053] This implementation provides a composite modifier for deep modification of eutectic silicon, which includes 6.5% of Sr, 6.0% of Ce, 6.0% of La and 86.0% of Al in terms of mass percentage, and unavoidable impurity elements ;

[0054] The compound modificator is prepared by the following method:

[0055] S1: put industrial pure aluminum into the melting furnace, raise the temperature to 750°C, after it is completely melted, add a covering agent of 0.02% of the mass of the melt, and then use a bell jar made of Ti to press metal Sr, Al-20Ce, Al-15La into the melt middle;

[0056] S2: The temperature is raised to 880° C., and after the raw materials are completely melted, the components are sampled and tested; then high-purity argon gas with a purity of 99.99% is introduced into the melt for 15 minutes;

[0057] S3: After the melt was allowed to stand for 20 minutes, the slag was removed, and cast into a semi-continuous casting machine to prepare a cylindrical ingot with a...

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Abstract

The invention discloses a composite modifier for deep modification of eutectic silicon and a preparation method thereof, and relates to the field of aluminum-silicon casting alloys; the modifier includes Sr 5.0-8.0%, RE 8.5%-15% in terms of mass percentage, The impurity element is less than or equal to 0.30%, and the balance is Al; wherein, RE is one or two of La and Ce; and the method includes a smelting step and a hot extrusion step carried out in sequence. This method prepares a low-cost, high-efficiency composite modifier, and the modifier can change the growth mode or stacking sequence of the silicon phase by using Sr as the main modifier, and promote the transformation of the silicon phase to particles or fibers, and use RE as an auxiliary modifier It can not only change the growth direction of the eutectic silicon phase together, but also inhibit the diffusion and migration of elements such as Sr and Si, and improve the nucleation rate and modification efficiency of eutectic silicon; at the same time, the formation of fine rare earth phases can hinder the movement of dislocations, Improve alloy strength.

Description

technical field [0001] The invention relates to the technical field of casting aluminum alloys, in particular to a composite modifier for deep modification of eutectic silicon and a preparation method thereof. Background technique [0002] Cast Al-Si alloy has the advantages of good fluidity, low shrinkage rate and thermal expansion coefficient, good corrosion resistance and recyclability, etc. It is suitable for the preparation of large-sized, complex-structured, thin-walled castings, and is widely used in automobiles, communications and other fields. With the rapid development of new energy vehicles and 5G communication base stations, lightweight has become one of the common key issues that the industry focuses on. Al-Si alloy as the basic raw material is also facing the challenge of performance upgrade. [0003] The common structure of Al-Si casting alloy includes α-Al phase, eutectic silicon, and a small amount of intermetallic compounds. Among them, the Si phase, as a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/06C22C1/03C22C1/02C22C21/00C22F1/04B21C23/02
CPCC22C1/06C22C1/03C22C1/026C22C21/00C22F1/04B21C23/02
Inventor 宋东福胡锌意杨莉甘春雷黄惠兰
Owner GUANGDONG INST OF NEW MATERIALS
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