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Alloying-element-strengthened high-silicon aluminum composite and preparation method thereof

A composite material and alloy element technology, applied in the field of alloy element reinforced high-silicon-aluminum composite material and its preparation, can solve the problems of poor comprehensive performance of composite materials, difficult processing and welding, and difficulty in meeting use requirements, and achieve consistency. Good, comprehensive performance, the effect of inhibiting the growth of silicon phase

Active Publication Date: 2016-11-09
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the industrial production of silicon-aluminum composite materials with a Si content of more than 48% has always been difficult, because the higher the Si content, the more serious the composition segregation, the greater the brittleness of the material, the poorer mechanical properties, and the difficulty in processing and welding, especially in traditional casting. Aluminum-silicon composite materials, the coarse lath-like primary Si phase in the structure leads to poor comprehensive performance of the composite material, and it is difficult to meet the use requirements
So far, there are few records in relevant literature about the technology of strengthening high-silicon-aluminum composite materials with Mg and / or Cu elements

Method used

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  • Alloying-element-strengthened high-silicon aluminum composite and preparation method thereof
  • Alloying-element-strengthened high-silicon aluminum composite and preparation method thereof
  • Alloying-element-strengthened high-silicon aluminum composite and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Preparation of Al-50Si-2Cu composite materials.

[0043]1) The raw materials are single crystal silicon, high-purity aluminum (99.998-99.999% Al), aluminum-copper master alloy (60% Cu), and the ingredients of each alloy element are as follows: silicon: 50%, copper: 2%, and the balance is aluminum.

[0044] 2) Tundish preheating, the preheating temperature is about 960°C.

[0045] 3) Melting: Put the high-purity aluminum ingot in an intermediate frequency induction furnace and raise the temperature to 820°C. After the aluminum ingot is completely melted, raise the temperature to 1200°C. At the same time, add monocrystalline silicon in batches, and cool down to 800°C after the monocrystalline silicon is completely melted. , add aluminum-copper master alloy, stir thoroughly for 5 minutes, cover slagging with 30% NaCl+47% KCl+23% cryolite, and degas with hexachlorohexane.

[0046] 4) Atomization and deposition: heat the molten alloy to 850°C, keep it warm for 5 minutes, p...

Embodiment 2

[0058] Al-50Si-1Mg composites were prepared.

[0059] 1) The raw materials are single crystal silicon, high-purity aluminum (99.998-99.999% Al), aluminum-magnesium master alloy (67% Mg), and the ingredients of each alloy element are as follows: silicon: 50%, magnesium: 1%, and the balance is aluminum.

[0060] 2) Tundish preheating, the preheating temperature is about 960°C.

[0061] 3) Melting: Put the high-purity aluminum ingot in an intermediate frequency induction furnace and raise the temperature to 820°C. After the aluminum ingot is completely melted, raise the temperature to 1200°C. At the same time, add monocrystalline silicon in batches, and cool down to 780°C when the monocrystalline silicon is completely melted. , add aluminum-magnesium master alloy, fully stir for 5 minutes, cover slagging with 30% NaCl+47% KCl+23% cryolite, and degas with hexachlorohexane.

[0062] 4) Atomization and deposition: raise the temperature of the molten alloy to 845°C, keep it warm fo...

Embodiment 3

[0066] Al-50Si-1Cu-0.5Mg composites were prepared.

[0067] 1) The raw materials are single crystal silicon, high-purity aluminum (99.998-99.999% Al), aluminum-copper master alloy (60% Cu), aluminum-magnesium master alloy (67% Mg), and the ingredients of each alloy element are as follows: Silicon: 50 %, copper: 1%, magnesium: 0.5%, and the balance is aluminum.

[0068] 2) Tundish preheating, the preheating temperature is about 960°C.

[0069] 3) Melting: Put the high-purity aluminum ingot in an intermediate frequency induction furnace and raise the temperature to 820°C. After the aluminum ingot is completely melted, raise the temperature to 1200°C. At the same time, add monocrystalline silicon in batches, and cool down to 800°C after the monocrystalline silicon is completely melted. , add aluminum-copper master alloy, stir for 5 minutes and cool down to 780°C, add aluminum-magnesium master alloy, stir for another 5 minutes, cover with 30% NaCl+47% KCl+23% cryolite to form sla...

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Abstract

The invention provides a preparation method of an alloying-element-strengthened high-silicon aluminum composite and belongs to the technical field of material preparation. The preparation method is particularly suitable for preparation of electronic packaging material. The designed alloying-element-strengthened high-silicon aluminum composite comprises, by mass percent, 48.0%-52.0% of silicon, 0.5%-4.0% of X and the balance aluminum. The X is copper and / or magnesium. The preparation method of the alloying-element-strengthened high-silicon aluminum composite comprises the steps that a silicon source, an aluminum source and an X source are prepared according to the designed components, the prepared silicon source, the prepared aluminum source and the prepared X source are smelted, and then a melt is obtained; and atomized spray deposition is conducted on the obtained melt, so that a deposition preform is obtained, hot isostatic pressing treatment is conducted on the deposition preform, and then a finished product is obtained, wherein during hot pressing pressure treatment, the temperature is controlled to be 520-600 DEG C, and the pressure is controlled to be 150-200 MPa. The designed composite has the advantages of being excellent in comprehensive performance, outstanding in mechanical property, low in preparation cost and the like and is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to an alloy element-strengthened high-silicon-aluminum composite material and a preparation method thereof, belonging to the technical field of design and development of composite materials. technical background [0002] With the advent of the information technology revolution, the integrated circuit industry is developing rapidly in my country, which promotes the development of microwave circuits and electronic components in various fields to high power, miniaturization, systematization, high efficiency and high reliability. Electronic packaging materials such as lids, enclosures and frames impose more stringent requirements. Modern electronic packaging technology requires that new electronic packaging materials can work normally in the harsh environment of high temperature, high humidity, high salt, radiation and various external signal interference, and are inevitably affected by various external forces, so they have excellent a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/02C22C30/00C22C30/02C22C1/04
CPCB22F3/115B22F3/15B22F2998/10C22C1/0416C22C21/02C22C30/00C22C30/02
Inventor 王日初
Owner CENT SOUTH UNIV
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