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

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,...

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