Method for preparing aluminum matrix composite material through synergism of alterant and carbon nano-materials

An aluminum-based composite material and carbon nanomaterial technology, which is applied in the field of metal material manufacturing, can solve the problems of reducing the mechanical properties of materials, and carbon nanotubes are prone to agglomeration, and achieve the effects of reducing structural damage, eliminating hydrogen absorption, and combining well.

Active Publication Date: 2019-10-22
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that carbon nanotubes are prone to agglomeration under rheological conditions, which will reduce the mechanical properties of the material to a certain extent.

Method used

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  • Method for preparing aluminum matrix composite material through synergism of alterant and carbon nano-materials

Examples

Experimental program
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Effect test

Embodiment 1

[0021] (1) Take Al-Si-Cu alloy (the mass percentage of Si is 10.5%, the mass percentage of Cu is 3.5%, and the balance is Al), Al-8Sr master alloy (the mass percentage of Sr is 8%), Al The -5C intermediate prefabricated block (the mass percentage of C is 5%) is dried in a vacuum drying oven for later use.

[0022] (2) Put the matrix alloy into a graphite crucible and heat up to 740°C, and remove the scum on the surface after it is completely melted. Then add the Al-8Sr master alloy covered with aluminum foil in batches according to the proportion, the total addition of Sr accounts for 0.04wt.% of the total weight of the melt, and apply high-energy ultrasound while adding Sr, and the ultrasonic horn probe extends into the melt The depth in the center is about 3mm, the ultrasonic power is 1.4kW, the ultrasonic frequency is 20kHZ, and the ultrasonic time is 5min. After ultrasonication, the alloy melt was heated to 770 °C for 30 min to ensure that Sr was completely melted into th...

Embodiment 2

[0026] (1) Take Al-Si-Cu alloy (the mass percentage of Si is 11.0%, the mass percentage of Cu is 3.2%, and the balance is Al), Al-9Sr master alloy (the mass percentage of Sr is 9%), Al The -6C intermediate prefabricated block (the mass percentage of carbon nanofibers is 6%) was dried in a vacuum drying oven for later use.

[0027] (2) Put the matrix alloy into a graphite crucible and heat it up to 750°C, and remove the scum on the surface after it is completely melted. Then add the Al-9Sr master alloy covered with aluminum foil in batches according to the proportion, the total addition of Sr accounts for 0.05wt.% of the total weight of the melt, and apply high-energy ultrasound while adding Sr, and the ultrasonic horn probe extends into the melt The depth in the center is about 4mm, the ultrasonic power is 2.1kW, the ultrasonic frequency is 20kHZ, and the ultrasonic time is 8min. Then the alloy melt was heated to 780°C for 35 min to ensure that Sr was completely melted into t...

Embodiment 3

[0033] (1) Take Al-Si-Cu alloy (the mass percentage of Si is 11.5%, the mass percentage of Cu is 3.0%, and the balance is Al), Al-10Sr master alloy (the mass percentage of Sr is 10%), Al The -7C intermediate prefabricated block (the mass percentage of carbon nanofibers is 7%) was dried in a vacuum drying oven for later use.

[0034] (2) Put the matrix alloy into a graphite crucible and heat up to 740°C, and remove the scum on the surface after it is completely melted. Then add the Al-10Sr master alloy covered with aluminum foil paper in batches according to the proportion, the total addition of Sr accounts for 0.06wt.% of the total weight of the melt, and apply high-energy ultrasound while adding Sr, and the ultrasonic horn probe extends into the melt The depth in the center is about 5mm, the ultrasonic power is 2.8kW, the ultrasonic frequency is 20kHZ, and the ultrasonic time is 10min. Then the alloy melt was heated to 780 °C for 40 min to ensure that Sr was completely melte...

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Abstract

The invention provides a method for preparing an aluminum matrix composite material through synergism of alterant and carbon nano-materials. The method comprises the following steps of: putting a matrix alloy in a crucible, heating to 740 to 750 DEG C, adding Al-Sr intermediate blocks in batches after melting, wherein the addition amount of Sr accounts for 0.04 to 0.06 wt.% of the total weight ofa melt, simultaneously applying ultrasound, causing an ultrasonic probe to stretch into the melt by about 3 to 5mm, wherein the ultrasonic power is 1.4 to 2.8kW, the frequency is 20kHZ, and the time is 5 to 10min; and after completing ultrasound, heating the melt to 770 DEG C to 780 DEG C, and carrying out heat preservation for 30 to 40 minutes; then adding Al-C intermediate blocks to the melt inbatches at different angles under the protection of argon, wherein the addition amount of the carbon accounts for 0.5-1.0wt.% of the total weight of the melt, simultaneously applying ultrasound for 10to 15 minutes, and after completing ultrasound, when the temperature of the melt drops to 700 DEG C, casting to obtain the aluminum matrix composite material. The method is stable, safe and reliablein process; the prepared material has uniform and refined structure; and the performances of the aluminum matrix composite material are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of metal material manufacture, and in particular relates to a method for synergistically preparing Al-Si-Cu composite materials with a modifier and carbon nanofibers. Background technique [0002] Al-Si-Cu alloys have excellent casting performance, high specific strength, small thermal expansion coefficient, good corrosion resistance and excellent electrical and thermal conductivity, but the α-Al dendrites in the cast structure are coarse, The silicon phase is in the shape of thick plates or strips, and the iron-rich phase is in the shape of thick and long needles, which will lead to a decrease in its mechanical properties and greatly limit the application of the alloy. Studies have shown that adding a small amount of modifier to aluminum-silicon alloys can not only achieve better refinement and modification effects, but also have the effect of purifying the melt and degassing. Therefore, it is of great sig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/10C22C1/03C22C21/04
CPCC22C1/1036C22C21/04C22C2026/002
Inventor 闫洪熊俊杰
Owner NANCHANG UNIV
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