Chromium carbide-CNT nanocomposites with enhanced mechanical properties

    Authors

    V. Singh; R. Diaz; K. Balani; A. Agarwal;S. Seal

    Comments

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    Abstract

    Chromium carbide is widely used as a tribological coating material in high-temperature applications requiring high wear resistance and hardness. Herein, an attempt has been made to further enhance the mechanical and wear properties of chromium carbide coatings by reinforcing carbon nanotubes, (CNTs) as a potential replacement of soft binder matrix using plasma spraying. The microstructures of the;prayed CNT-reinforced Cr(3)C(2) coatings were characterized using transmission electron microscopy and scanning electron microscopy. The mechanical properties were assessed using micro-Vickers hardness, nanoindentation and wear measurements. CNT reinforcement improved the hardness of the coating by 40%, and decreased the wear rate of the coating by almost 45-50%. Cr(3)C(2) reinforced with 2 wt.%, CNT had an elastic modulus 304.5 +/- 29.2 GPa, hardness of 1175 +/- 60 VH(0.300) and a coefficient of friction of 0.654. It was concluded that the CNT reinforcement increased the wear resistance by forming intersplat bridges while the improvement in the hardness was attributed to the deformation resistance of CNTs under indentation. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

    Journal Title

    Acta Materialia

    Volume

    57

    Issue/Number

    2

    Publication Date

    1-1-2009

    Document Type

    Article

    First Page

    335

    Last Page

    344

    WOS Identifier

    WOS:000262736800004

    ISSN

    1359-6454

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