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Development of a deposition process of Al/NTC/TiO2 composite over Al alloy substrate through selective laser melting technique

Abstract

This proposal for a Regular Project aims to develop aluminum matrix composites reinforced by carbon nanotubes (NTC), using selective laser melting technique. Al powder and NTC will be used to form a composite layer over a commercial Al alloy, in order to obtain a localized reinforcement effect on the substrate. The NTC will be previously coated by TiO2 nanoparticles via sol-gel technique, in order to develop a thermal barrier for NTC protection during the high-temperature processing cycle. Besides, it is expected that the TiO2 coated NTC be better dispersed into the Al matrix, obtaining an intimate contact with the matrix in the final composite. This proposal is planned to be concluded in three years. Laser melting enables a strict control of the thermal input over a large range. Furthermore, the process setup is very simple and suitable to process small amounts of material in a very short time, resulting in material and time savings. The composite deposition, layer by layer, enables a good control on the film thickness. The production of thicker layers can be used to evaluate the potential of this composite for the manufacture of parts using additive manufacturing concepts. (AU)

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