Title

Carbon nanotube reinforced aluminum composite coating via cold spraying

Authors

Authors

S. R. Bakshi; V. Singh; K. Balani; D. G. McCartney; S. Seal;A. Agarwal

Comments

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Abbreviated Journal Title

Surf. Coat. Technol.

Keywords

cold spraying; carbon nanotubes; aluminum; composites; elastic modulus; POLYMER COMPOSITES; HEAT-TREATMENT; GAS; MATRIX; DEPOSITION; MICROSTRUCTURE; NANOCOMPOSITES; MECHANISM; FABRICATION; STRENGTH; Materials Science, Coatings & Films; Physics, Applied

Abstract

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 pm 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. (C) 2008 Elsevier B.V. All rights reserved.

Journal Title

Surface & Coatings Technology

Volume

202

Issue/Number

21

Publication Date

1-1-2008

Document Type

Article

Language

English

First Page

5162

Last Page

5169

WOS Identifier

WOS:000258588400015

ISSN

0257-8972

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