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Surface analysis of nanocomposite ceramic coatings
Author(s) -
Portinha A.,
Teixeira V.,
Monteiro A.,
Costa M. F.,
Lima N.,
Martins J.,
Martinez D.
Publication year - 2003
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.1570
Subject(s) - materials science , thermal barrier coating , temperature cycling , tetragonal crystal system , microstructure , cubic zirconia , ceramic , layer (electronics) , surface roughness , nanocomposite , composite material , phase (matter) , physical vapor deposition , coating , thermal , chemistry , physics , organic chemistry , meteorology
Zirconia coatings partially or totally stabilized in the high‐temperature phase have a good combination of thermal, physical and mechanical properties and thus have technological applications such as in thermal barrier coatings for protecting aero and land‐based gas turbine components at very high temperature and in adverse corrosive environments. Zirconia/alumina (ZrO 2 /Al 2 O 3 )‐nanolayered coatings are a new way of stabilizing the ZrO 2 within a high‐temperature tetragonal phase at room temperature. In this paper we present a study of the morphology and microtopography of standard ZrO 2 Y 2 O 3 and ZrO 2 /Al 2 O 3 ‐nanolayered coatings prepared by plasma vapour deposition. The ZrO 2 /Al 2 O 3 ‐nanolayered coatings have layer thicknesses of 3/3.5, 6/7 and 12/14 nm, with a total layer thickness of 2.4 µm. These coatings were deposited by d.c. reactive magnetron sputtering. The surface morphology and microtopography were analysed by atomic force microscopy and laser microtopography. The roughness was also evaluated. Energy‐dispersive x‐ray spectrometry was used to obtain the layer composition and SEM was used to measure the layer thickness, to observe the microstructure of the layer cross‐section and to analyse the surface morphology before and after thermal cycling of the nanolayered coatings. After thermal cycling at 1000 °C in air the coatings showed a few structure densifications and the roughness increased slightly. The nanolayered coatings crystallized in the high‐temperature tetragonal phase. Copyright © 2003 John Wiley & Sons, Ltd.