Carbon nanotube reinforced aluminum based composite material and its vacuum hot pressing prepn. method

Abstract

This invention discloses a method for preparing carbon nanotube-reinforced aluminum-based composite by vacuum hot pressing. The composite, comprising carbon nanotubes 0.1-5 wt.% and aluminum alloy powders 95-99.9 wt.%, is prepared by: (1) immersing carbon nanotubes in mixed acids, and adding surfactant; (2) dispersing; (3) filtrating, and washing carbon nanotubes with distilled water to neutrality; (4) performing two-step ball milling; (5) vacuum drying; (6) hot pressing in vacuum; and (7) hot extruding to obtain carbon nanotube-reinforced aluminum-based composite. This invention improves the capacity of aluminum alloy matrix in resisting abrasion, reducing friction, self-lubricating, surface wettability and mechanical properties.

Description

technical field

[0001] The invention relates to an aluminum-based composite material and a preparation method thereof. Background technique

[0002] Carbon nanotubes are a new type of self-assembled single-molecule material, which is a seamless nanoscale tubular material rolled from a single-layer or multi-layer carbon hexagonal planar network. Carbon nanotubes have good wear resistance, anti-friction and self-lubricating properties, excellent mechanical properties and low density, and are ideal matrix reinforcement and toughening materials. Since the volume of carbon nanotubes is much smaller than that of conventional carbon fibers, when composited with a metal matrix, the continuity of the matrix will not be destroyed, and it is possible to achieve the performance of conventional carbon fiber composite materials with a small amount of doping, which is easier in the matrix. Infiltration and pinning. However, carbon nanotubes cannot be combined with the aluminum alloy matr...