Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/41593

Title

Contact damage in plasma-sprayed alumina-based coatings

Author(s)

Pajares, Antonia;  Wei, Lanhua;  Lawn, Brian R.;  Berndt, Christopher C.

Abstract

A study of Hertzian contact damage in plasma-sprayed alumina-based ceramic coatings on steel substrates has been made. Presectioned specimens are used to identity subsurface micromechanical damage processes within the coating and substrate layers as a function of increasing contact load, from both postcontact and in situ observations. Damage occurs principally by cracking in the ceramic coating and plastic deformation in the metal substrate, along with delamination at the coating/substrate interface. Coating thickness, cycling loading (fatigue), and processing history (coating microstructure) are shown to be important factors in the damage patterns and ensuing modes of failure. Indentation stress-strain curves are used to measure macroscopic mechanical responses, to quantify the maximum sustainable contact stresses and to determine the relative roles of coating and substrate in the net deformation.

Publication type

Journal article

Source

Journal of the American Ceramic Society, Vol. 79, no. 7 (Jul 1996), pp. 1907-1914

Publication year

1996

Keyword(s)

Ceramic coatings;  Chemical cracking;  Coating thickness;  Cycling loading;  Delamination;  Hertzian contact damage;  Indentation;  Loading;  Microcracks;  Plastic deformation;  Processing history;  Steel;  Strain;  Stresses;  Substrates

Publisher

Wiley-Blackwell Publishing

ISSN

0002-7820

Publisher URL

http://dx.doi.org/10.1111/j.1151-2916.1996.tb08012.x

Peer reviewed