Carbon nanotube reinforced aluminum composite coating via cold spraying

    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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