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High Temperature Material Processes (An International Quarterly of High-Technology Plasma Processes)

An International Journal

ISSN for PRINT: 1093-3611

Institutional price:	$604.00
Issues per year:	4

Best Paper Award Selection - Editorial Board Site

2006, Volume10

173 pages

DOI: 10.1615/HighTempMatProc.v10.i2

Issue price - $155.00

PORE NETWORK ARCHITECTURE IN PLASMA SPRAYED CERAMIC COATINGS

Guy Antou
SPCTS - UMR CNRS 6638, Faculty of Sciences, University of Limoges, 123 avenue Albert Thomas, 87060 Limoges, France

Ghislain Montavon
SPCTS - UMR CNRS 6638, Faculty of Sciences, University of Limoges, 123 avenue Albert Thomas, 87060 Limoges, France

ABSTRACT

A combination of two techniques was implemented to quantify the morphology and the connectivity of the complex pore-crack network architecture of thermal sprayed coatings:

image analysis coupled to stereological protocols permits to quantify the coating porous morphology, that is to say the porosity level (with a discrimination between globular pores and cracks), the orientation and the linear density of cracks;
electrochemical impedance spectroscopy permits to quantify the pore connectivity (the open porosity level).

These techniques were applied to characterize the pore structure of grey alumina (Al₂O₃-13TiO₂) coatings and Yttria-Partially Stabilized Zirconia (Y-PSZ) Thermal Barrier Coatings (TBCs), respectively manufactured implementing air plasma spraying and hybrid plasma spraying (which combines plasma spraying and in situ laser remelting).