A kind of preparation method of carbon nanotube reinforced aluminum matrix composite material

Abstract

The invention provides a preparation method for a carbon nano tube reinforced aluminum matrix composite material. The preparation method comprises the following steps that firstly, composite powder with carbon nano tubes evenly dispersed is obtained by adopting low-temperature ball milling; and then a composite blank is obtained after the powder is solidified by sleeve installing, air removing and hot isostatic pressing; and further, a bar material, or a sectional material or a forge piece product is formed by normal hot working methods such as squeezing and forging and pressing; and finally, heat treatment is conducted. According to the preparation method, the carbon nano tubes have good dispersity in an aluminum alloy matrix, the damage degree of reinforced bodies of the carbon nano tubes is small, the formed composite material has even microstructures and good interface bonding; and meanwhile, the composite material has high strength and plasticity, and is expected to be applied to the fields, such as aerospace and cars, which have strong needs for light-weight high-strength structural materials.

Description

technical field [0001] The invention provides a method for preparing a carbon nanotube reinforced aluminum-based composite material, which belongs to the technical field of metal-based composite materials. Background technique [0002] Aluminum matrix composites have high specific strength, specific modulus, good electrical and thermal conductivity, and high temperature performance. They have been applied in aerospace, automotive, and microelectronics fields and have attracted more and more attention. Carbon nanotubes have a unique structure and excellent physical and chemical properties (the Young's modulus can reach 1-1.8TPa, the tensile strength can reach 150GPa, and the density can reach 1.2-1.8g / cm 3 , the thermal expansion coefficient is almost zero, and it also has good toughness and plastic deformation ability), its comprehensive performance is far superior to the existing particles or fibers, and it is an ideal reinforcement for composite materials. However, carbon...

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Problems solved by technology

Carbon and most metals including Al are difficult to wet spontaneously. Although studies have shown that to a certain extent, interfacial reactions can improve wettability and increase interfacial bonding strength, but the generation of a large number of reactants undoubtedly weakens the strengthening of reinforcements. Therefore, it is also a very important issue to reduce the damage degree of the reinforcement in the composite material and precisely control the interface structure of the composite material.

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