Contact damage in plasma-sprayed alumina-based coatings

Journal Article · Mon Jul 01 04:00:00 EDT 1996 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1996.tb08012.x· OSTI ID:282216

Pajares, A; Wei, L; Lawn, B R ^[1]; Berndt, C C ^[2]

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1. National Inst. of Standards and Technology, Gaithersburg, MD (United States). Materials Science and Engineering Lab.
2. State Univ. of New York at Stony Brook, NY (United States). Dept. of Materials Science and Engineering

A study of Hertzian contact damage in plasma-sprayed alumina-based ceramic coatings on steel substrates has been made. Presectioned specimens are used to identify 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.

• Sponsoring Organization: USDOE
• OSTI ID: 282216
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 7 Vol. 79; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
CRACKS
DEFORMATION
FATIGUE
FRACTURE PROPERTIES
HARDNESS
INTERFACES
MICROSTRUCTURE
OPTICAL MICROSCOPY
PLASMA ARC SPRAYING
SAMPLE PREPARATION
STEELS
STRAINS
STRESSES
TITANIUM OXIDES