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Powder metallurgy preparation method of carbon nanotube reinforced aluminum alloy composite material

A technology of carbon nanotubes and composite materials, applied in the field of metal matrix composite materials, can solve the problems of reducing the reinforcing effect of carbon nanotubes, damage to the structure of carbon nanotubes, strict requirements on the preparation environment, etc. Conducive to large-scale production, reliable and efficient process

Active Publication Date: 2014-05-14
SHANGHAI JIAO TONG UNIV
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  • Application Information

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Problems solved by technology

However, this method still has the following major deficiencies: (1) Mechanical alloying requires long-term high-energy ball milling, which leads to serious damage to the structure of carbon nanotubes, and it is easy to react with the aluminum matrix to form Al 4 C 3 , which reduces the strengthening effect of carbon nanotubes; (2) Al can be detected by X-ray diffraction in the final sample after heat treatment 2 Cu phase, indicating that the precipitated phase has grown sufficiently, which reduces the strengthening effect of the alloy; (3) There are active metal powders such as elemental magnesium in the raw material, which has strict requirements on the preparation environment, which is not conducive to large-scale preparation of materials

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  • Powder metallurgy preparation method of carbon nanotube reinforced aluminum alloy composite material
  • Powder metallurgy preparation method of carbon nanotube reinforced aluminum alloy composite material
  • Powder metallurgy preparation method of carbon nanotube reinforced aluminum alloy composite material

Examples

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Effect test

Embodiment 1

[0039] Carbon nanotube reinforced aluminum-copper alloy (containing 3wt.% carbon nanotubes and 4wt.% copper)

[0040] Take 50g of 40μm pure copper powder and place it in a planetary ball mill, use water as a solvent, add 4g of imidazoline as a ball milling process control agent, use stainless steel balls as a ball milling medium, the ball to material ratio is 20:1, and ball mill at a speed of 426 rpm After 10 hours, the flake copper powder was obtained after suction filtration and drying. The flake diameter was about 5 μm, the flake thickness was about 500 nm, and the aspect ratio was about 10.

[0041] Get 93g30μm pure aluminum powder, 4g above-mentioned flake copper powder and 3g carbon nanotube, as figure 2 Shown is its scanning electron micrograph, where: figure 2 (a) is spherical aluminum powder, figure 2 (b) is flake copper powder, figure 2 In (c) is the raw material carbon nanotubes, from figure 2 In (c), it can be seen that the carbon nanotubes initially agglo...

Embodiment 2

[0050] Carbon nanotube reinforced aluminum-zinc-magnesium-copper-silicon alloy (containing carbon nanotubes 1wt.%, zinc 9wt.%, magnesium 2wt.%, copper 2.5wt.%)

[0051] Using 40 μm pure zinc powder as the zinc source, 50 g of zinc powder was placed in a planetary ball mill, under the protection of argon, stainless steel balls were used as the ball milling medium, the ball-to-material ratio was 10:1, and the ball milled at a speed of 426 rpm for 8 hours. The flaky zinc powder was obtained, with a sheet diameter of about 3 μm, a sheet thickness of about 200 nm, and an aspect ratio of about 15.

[0052] Using 10μm 5083 aluminum powder (containing 4wt.% magnesium) as the magnesium source, take 100g of 5083 aluminum powder and place it in a stirring ball mill and add 1.5g of stearic acid. Under the protection of argon, use stainless steel balls as the ball milling medium, and the ball-to-material ratio is 20:1, ball milled at 426 rpm for 2 hours to obtain flake 5083 aluminum powder...

Embodiment 3

[0058] Carbon nanotube reinforced aluminum-copper-magnesium alloy (containing carbon nanotubes 2wt.%, copper 2wt.%, magnesium 0.5wt.%)

[0059] Prepare flake copper powder and flake 5083 powder according to the method in embodiment 1 and embodiment 2, take 83.5g100μm spherical pure aluminum powder, 2g flake copper powder, 12.5g flake 5083 powder and 2g carbon nanotube according to the design ratio , placed in a stirring ball mill, under the protection of argon, using stainless steel balls as the ball milling medium, the ball-to-material ratio is 20:1, milling at a speed of 352 rpm for 3 hours, and then milling at a speed of 426 rpm for 1 hour , to prepare carbon nanotube / metal composite powder.

[0060]The above-mentioned composite powder was sintered by vacuum hot pressing at 575°C and 100 MPa for 2 hours to form a green body with a diameter of 40 mm, and then kept in a vacuum extrusion furnace at 460°C for 1 hour and then extruded at an extrusion ratio of 16:1 and an extrusi...

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Abstract

The invention provides a powder metallurgy preparation method of a carbon nanotube reinforced aluminum alloy composite material. The method comprises the following steps: pre-preparing micro-nano flake powder of an alloying component, subsequently ball-milling the powder with a carbon nanotube and spherical pure aluminum powder to prepare flake composite powder, and further performing densifying, sintering, thermal deformation processing and thermal treatment to achieve alloying so as to finally obtain the carbon nanotube reinforced aluminum alloy composite material. Uniform compounding of the matrix aluminum powder, the carbon nanotube and the alloying component can be achieved through limited ball-milling, and meanwhile dangerous elements or uneasy grinding elements such as magnesium and silicon which are high in activity and likely to combust and explode are avoided by adopting the stable and easily ground pre-alloying aluminum powder, so that the security and the reliability are improved; in addition, because of large interlayer boundary and small layer thickness distance, the flake structure is beneficial for uniformly dispersing the alloying component and forming refined dispersed separated phase. The method is beneficial for bringing the effects of composite reinforcement of carbon nanotubes and alloy reinforcement into play to the maximum extent, is energy-saving and time-saving, and is safe and feasible.

Description

technical field [0001] The invention relates to the technical field of metal matrix composite materials, in particular to a powder metallurgy preparation method of carbon nanotube reinforced aluminum alloy composite materials. Background technique [0002] With the rapid development of the national economy and high-tech fields such as aerospace and national defense, the demand for lightweight, high-strength, high-modulus, and high-toughness materials is increasing. At present, the development of high-strength aluminum alloys, including aluminum-copper-based hard aluminum alloys and aluminum-zinc-magnesium-copper superhard aluminum alloys, is becoming more and more mature. Of course, people have begun to pay attention to composite materials based on high-strength aluminum alloys. Carbon nanotubes have a low density and have excellent mechanical and physical properties. They are ideal composite material reinforcements. With the maturity of its industrial production technology,...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C21/00
Inventor 李志强秦臻范根莲谭占秋张荻
Owner SHANGHAI JIAO TONG UNIV
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