Carbon nanotube reinforced aluminum composite coating via cold spraying

Multiwalled carbon nanotube (CNT) reinforced aluminum nanocomposite coatings were prepared using cold gas kinetic spraying. Spray drying was used to obtain a good dispersion of the nanotubes in micron-sized gas atomized Al–Si eutectic powders. Spray dried powders containing 5 wt.% CNT were blended w...

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Bibliographic Details
Published in:Surface & coatings technology 2008-07, Vol.202 (21), p.5162-5169
Main Authors: Bakshi, Srinivasa R., Singh, Virendra, Balani, Kantesh, McCartney, D. Graham, Seal, Sudipta, Agarwal, Arvind
Format: Article
Language:English
Subjects:
Aluminum
Applied sciences
Carbon nanotubes
Cold spraying
Composites
Cross-disciplinary physics: materials science
rheology
Elastic modulus
Exact sciences and technology
Materials science
Metals. Metallurgy
Physics
Production techniques
Surface treatment
Surface treatments
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Summary:Multiwalled carbon nanotube (CNT) reinforced aluminum nanocomposite coatings were prepared using cold gas kinetic spraying. Spray drying was used to obtain a good dispersion of the nanotubes in micron-sized gas atomized Al–Si eutectic powders. Spray dried powders containing 5 wt.% CNT were blended with pure aluminum powder to give overall nominal CNT compositions of 0.5 wt.% and 1 wt.% respectively. Cold spraying resulted in coatings of the order of 500 μm in thickness. Fracture surfaces of deposits show that the nanotubes were uniformly distributed in the matrix. Nanotubes were shorter in length as they fractured due to impact and shearing between Al–Si particles and the Al matrix during the deposition process. Nanoindentation shows a distribution in the elastic modulus values from 40–229 GPa which is attributed to microstructural heterogeneity of the coatings that comprise the following: pure Al, Al–Si eutectic, porosity and CNTs.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2008.05.042