Synthesis of aluminum oxide coating with carbon nanotube reinforcement produced by chemical vapor deposition for improved fracture and wear resistance

    Authors

    A. K. Keshri; J. Huang; V. Singh; W. B. Choi; S. Seal;A. Agarwal

    Comments

    Authors: contact us about adding a copy of your work at STARS@ucf.edu

    Abbreviated Journal Title

    Carbon

    Keywords

    MECHANICAL-PROPERTIES; CERAMIC-MATRIX; TRIBOLOGICAL BEHAVIOR; CNT; COMPOSITES; NANOCOMPOSITE; HETEROCOAGULATION; POLYMER; SINGLE; Chemistry, Physical; Materials Science, Multidisciplinary

    Abstract

    Chemical vapor deposition (CVD) was used to achieve a homogeneous dispersion of carbon nanotubes (CNTs) on aluminum oxide (Al(2)O(3)) powder. This powder was plasma sprayed onto a steel substrate to produce a 96% dense Al(2)O(3) coating with CNT reinforcement. Addition of 1.5 wt.% CNTs showed a 24% increase in the relative fracture toughness of the composite coating. The improvement in the fracture toughness is attributed to uniform dispersion of CNTs and toughening mechanism such as CNT bridging, crack deflection and strong interaction between CNT/Al(2)O(3) interfaces. Wear and friction behavior of the CNT reinforced Al(2)O(3) coating under dry sliding condition was investigated by ball-on-disk tribometer. With the increasing normal loads from 10 to 50 N, the wear volume loss and coefficient of friction of the coating increased, owing to transition from the mild to severe wear. Wear resistance of the Al(2)O(3)-CNT composite coating improved by similar to 27% at 50 N. Coefficient of friction at 50 N was dependent on the competing phenomena of wear debris generation and graphitization due to pressure. (C) 2009 Elsevier Ltd. All rights reserved.

    Journal Title

    Carbon

    Volume

    48

    Issue/Number

    2

    Publication Date

    1-1-2010

    Document Type

    Article

    Language

    English

    First Page

    431

    Last Page

    442

    WOS Identifier

    WOS:000272764300015

    ISSN

    0008-6223

    Share

    COinS