High-silicon aluminum alloy and preparation method thereof

A high-silicon aluminum alloy and aluminum-silicon alloy technology, which is applied in the direction of improving process efficiency, can solve the problems of reducing the surface finish of machined parts, being susceptible to force peeling, and reducing the mechanical properties of the alloy, and achieves a good effect of primary silicon refinement. , Good organization refinement effect, simple and easy process effect

Inactive Publication Date: 2021-03-02
东莞市兴茂压铸有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These complex shapes and coarse primary silicon severely split the alloy matrix
Under the action of external force, local stress concentration is easy to occur at the tip and corners of the coarse primary silicon phase, which significantly affects the plasticity and wear resistance of the alloy, and seriously reduces the mechanical properties of the alloy.
In addition, during the processing of various parts made of high-silicon aluminum alloys, the hard and brittle coarse primary silicon is easily peeled off by force, which reduces the surface finish of machined parts and accelerates the wear of machining tools

Method used

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  • High-silicon aluminum alloy and preparation method thereof
  • High-silicon aluminum alloy and preparation method thereof
  • High-silicon aluminum alloy and preparation method thereof

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preparation example Construction

[0031] 1. Preparation method of high silicon aluminum alloy

[0032] A first aspect of the present invention provides a method for preparing a high-silicon aluminum alloy, comprising the following steps:

[0033] 1) Heat the aluminum-silicon alloy melt to above 650°C and keep it warm; in this step, the heating temperature is preferably controlled between 650°C and 680°C, and the holding time is not less than 30 minutes. Of course, the longer the holding time, the better the effect Good, for example: keep warm for 30min, 40min, 60min, 90min, 120min or longer;

[0034] 2), adding 3 to 8 wt% refining agent to the aluminum-silicon alloy melt obtained in step 1) while stirring, and then removing inclusions from the aluminum-silicon alloy melt obtained after refining; in this step, it is preferable to add the refining agent The content can be 3wt%, 5wt% or 6wt%, etc.; the time for stirring is not less than 30min, for example: stirring for 30min, 40min, 60min, 90min, 120min or longe...

Embodiment 1

[0041] A preparation method of high-silicon aluminum alloy, comprising the following steps:

[0042] 1) Heat the aluminum-silicon alloy melt to above 650°C and keep it warm for 30 minutes;

[0043] 2), adding 5wt% refining agent to the aluminum-silicon alloy melt obtained in step 1), stirring at the same time, standing for 30 minutes, and then removing inclusions from the aluminum-silicon alloy melt obtained after refining;

[0044] 3), add 3wt% Al-5Ti-1B refiner to the aluminum-silicon alloy melt obtained in step 2), stir, and then extend the tool head of the ultrasonic instrument into the stirred aluminum-silicon alloy melt for ultrasonic Treat for 30 minutes;

[0045] 4) Cooling the aluminum-silicon alloy melt obtained in step 3) to 620° C. to 650° C. and keeping it warm for 30 minutes, and then removing impurities and purifying the aluminum-silicon alloy melt.

Embodiment 2

[0047] The difference with embodiment 1 is:

[0048] The ultrasonic treatment time is 60min.

[0049] The rest are the same as in Embodiment 1, and will not be repeated here.

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Abstract

The invention belongs to the technical field of aluminum alloy forming processing, and particularly relates to a high-silicon aluminum alloy and a preparation method thereof. The preparation method comprises the following steps that (1), aluminum-silicon alloy melt is heated to 650 DEG C or above, and heat preservation is conducted; (2), a refining agent is added into the aluminum-silicon alloy melt obtained in the step (1), stirring is conducted at the same time, and then inclusion removal is conducted on the aluminum-silicon alloy melt obtained after refining; (3), a refiner is added into the aluminum-silicon alloy melt obtained in the step (2), stirring is conducted, and then a tool head of an ultrasonic instrument extends into the stirred aluminum-silicon alloy melt for ultrasonic treatment; and (4), the aluminum-silicon alloy melt obtained in the step (3) is cooled to 620-650 DEG C and subjected to heat preservation, and then the aluminum-silicon alloy melt is subjected to impurity removal and purification. Compared with the prior art, the preparation method of the high-silicon aluminum alloy is simple and feasible in process, low in production cost and good in primary siliconrefining effect.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy forming and processing, and in particular relates to a high-silicon aluminum alloy and a preparation method thereof. Background technique [0002] Aluminum accounts for 8.13wt% of the total crust, and is one of the most abundant elements among metal elements. Aluminum and aluminum alloys have the characteristics of low density, light weight, high specific strength, good corrosion resistance, and excellent electrical and thermal conductivity. They are non-ferrous metal materials that are widely used in reality. With the rise of crude oil prices, the requirements of social environmental protection and the rapid development of manufacturing technology, under the requirements of energy saving, weight reduction and environmental protection, the materials used in transportation, aerospace and other industrial fields have increased the development of lightweight to achieve high strength, The purp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C1/06C22B9/02C22C21/02
CPCC22B9/026C22C1/026C22C1/06C22C21/02Y02P10/20
Inventor 胡建华藏伟华
Owner 东莞市兴茂压铸有限公司
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