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Preparation process of rapid solidification/sintering type high-silicon aluminum alloy for automobile

A high-silicon aluminum alloy and preparation technology, which is applied in the field of aluminum alloy, can solve the problems that aluminum-silicon alloy cannot meet the requirements, cannot meet the high performance of the material, and the continuity of the alloy matrix is ​​broken, so as to improve the aging strength, enhance the strength and toughness , Enhance the effect of high temperature tissue stability and strength

Inactive Publication Date: 2020-07-31
安徽嘀通网络科技有限公司
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When large-scale industrial production of hypereutectic aluminum-silicon alloys is carried out using casting technology, a large amount of primary silicon phase is precipitated in the alloy, which destroys the continuity of the alloy matrix and reduces the mechanical properties of the alloy.
When the silicon content in the alloy exceeds 14wt%, the coarse silicon has a great adverse effect on the comprehensive mechanical properties of the alloy, which seriously affects the use of the alloy
[0005] With the development of modern economy and society, especially the special needs of the automobile, aviation and aerospace industries, the conventional cast aluminum-silicon alloy is far from being able to meet the requirements
Conventional cast aluminum-based alloys cannot meet the high-performance requirements of materials due to composition segregation, while powder metallurgy parts generally have the following advantages: ①It can avoid composition segregation and ensure that the alloy has a uniform structure and stable performance; ②It can Use the combined effect of metal and metal, metal and non-metal to produce various materials with special properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A preparation process for rapid solidification / sintering type high-silicon aluminum alloys for automobiles, comprising the following steps:

[0031] (1) Preparation of aluminum alloy powder: the aluminum alloy powder is prepared by gas atomization; the aluminum alloy powder contains the following components by weight percentage: Si: 23.2%, Fe: 3.6%, Cu: 1%, Zr: 0.3%, Sr: 0.08%, Ce: 0.05%, and the balance is Al; the average particle size of the aluminum alloy powder is 70 μm, and the particle size of the powder with a mass fraction of 95% is ≤130 μm, and the powder shape is irregular + spherical + spherical;

[0032] (2) Cold pressing: Mix the alloy powder with 0.8% lubricant by mass evenly, then place it in the mold, press the indenter into the mold, and compact the powder with a pressure of 335MPa and a pressing time of 2.5s; the lubricant It is made by mixing paraffin wax and ethylene glycol at a mass ratio of 6:1;

[0033] (3) Extrusion: put the pressed alloy billet...

Embodiment 2

[0037] A preparation process for rapid solidification / sintering type high-silicon aluminum alloys for automobiles, comprising the following steps:

[0038](1) Preparation of aluminum alloy powder: the aluminum alloy powder is prepared by gas atomization; the aluminum alloy powder contains the following components by weight percentage: Si: 24.5%, Fe: 4%, Cu: 0.9%, Zr: 0.28%, Sr: 0.1%, Ce: 0.06%, and the balance is Al; the average particle size of the aluminum alloy powder is 68 μm, and the particle size of the powder with a mass fraction of 95% is ≤130 μm, and the powder shape is irregular + spherical + spherical;

[0039] (2) Cold pressing: Mix the alloy powder with 0.8% lubricant by mass evenly, then place it in the mold, press the indenter into the mold, and compact the powder, the pressure is 320-340MPa, and the pressing time is 3s; lubrication The agent is a mixture of paraffin wax and ethylene glycol at a mass ratio of 7:1;

[0040] (3) Extrusion: put the pressed alloy b...

Embodiment 3

[0044] A preparation process for rapid solidification / sintering type high-silicon aluminum alloys for automobiles, comprising the following steps:

[0045] (1) Preparation of aluminum alloy powder: the aluminum alloy powder is prepared by gas atomization; the aluminum alloy powder contains the following components by weight percentage: Si: 22.5%, Fe: 3.6%, Cu: 0.8%, Zr: 0.32%, Sr: 0.1%, Ce: 0.05%, and the balance is Al; the average particle size of the aluminum alloy powder is 65 μm, and the particle size of the powder with a mass fraction of 95% is ≤130 μm, and the powder shape is irregular + spherical + spherical;

[0046] (2) Cold pressing: Mix the alloy powder with 1% lubricant by mass evenly, then place it in the mold, press the indenter into the mold, and compact the powder. The pressure is 340MPa, and the pressing time is 2s; the lubricant is Paraffin wax and ethylene glycol are mixed at a mass ratio of 5:1;

[0047] (3) Extrusion: put the pressed alloy billet in an ex...

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Abstract

The invention provides a preparation process of a rapid solidification / sintering type high-silicon aluminum alloy for an automobile, and relates to the technical field of aluminum alloys. The preparation process comprises the following steps that (1) aluminum alloy powder is prepared, specifically, the aluminum alloy powder is prepared by adopting a gas atomization method, wherein the aluminum alloy powder comprises the following components of, by weight, 22-25.5 % of Si, 3.4-4.2% of Fe, 0.6%-1% of Cu, 0.2%-0.35% of Zr, 0.05%-0.12% of Sr, 0.02%-0.08% of Ce and the balance Al; (2) cold pressingis carried out; (3) extrusion is carried out; (4) sintering is carried out, specifically, the temperature is increased to 450-470 DEG C, heat preservation is carried out, then the temperature is increased to 575-600 DEG C for sintering, and heat preservation is carried out; and (5) heat treatment is carried out, specifically, heat preservation is carried out at 490-500 DEG C and then the temperature is increased to 525-535 DEG C, heat preservation is carried out, oil cooling is carried out after water cooling, and aging treatment is carried out. The preparation process is stable, the strength, the hardness and the toughness are high, the comprehensive performance is excellent, and the preparation process has a good application effect in the field of automobiles.

Description

technical field [0001] The invention relates to the technical field of aluminum alloys, in particular to a preparation process of a rapid solidification / sintering type high-silicon aluminum alloy for automobiles. Background technique [0002] Environmental and energy issues are great challenges facing the world today. As the price of automobile fuel continues to rise, the requirements for energy saving and environmental protection of automobiles are also increasing. The weight reduction of the car body is of great benefit to the fuel economy, control stability and collision safety of the car. Automobile lightweight technology also came into being. Automobile lightweight is of great significance to reduce emissions, save resources, and achieve sustainable development of the global economy and society. [0003] The lightweight of automobiles can be achieved in two ways: 1. Using modern design methods and means to optimize product design, including structural optimization de...

Claims

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Application Information

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IPC IPC(8): C22C1/04C22C21/02C22F1/043B22F1/00B22F9/08
CPCC22C1/0416C22C21/02C22F1/043B22F9/082B22F1/102
Inventor 戴王兵
Owner 安徽嘀通网络科技有限公司
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