Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/41672

Title

Studies on plasma-sprayed thermal barrier coatings

Author(s)

Berndt, Christopher C.

Abstract

The emphasis of this work has been the fundamental characterization of the material properties of thermal barrier coatings. Tests have been carried out on plasma sprayed ZrO//2-8wt%Y//2O//3 and ZrO//2-12wt%Y//2//3 (YSZ) coatings. The thermal expansion coefficient ( alpha ) is anisotropic in the longitudinal direction (planar to the substrate) compared to the transverse orientation (perpendicular to the substrate). The magnitude of alpha is dependent on prior heat treatment of the coating. The coating, deposited onto a superalloy substrate, was thermally cycled to 1200 degree C and failure followed via acoustic emission (AE) techniques. AE count rate distribution varies with temperature. Relationships of this nature lead to an understanding of cracking mechanisms within the coating.

Publication type

Conference paper

Source

NATO ASI series, series E: applied sciences: Surface engineering: surface modification of materials: Proceedings of the NATO Advanced Study Institute on Surface Engineering, Les Arcs, France, 03-15 July 1983 / Ram Kossowsky and Subhash C. Singhal (eds.), pp. 546-560

Publication year

1984

Keyword(s)

Acoustic emission testing;  AE;  Ceramic thermal barrier coatings;  Gas turbines;  Nickel cobalt chronium alloys;  Plasma spraying;  Protective coatings;  Thermal cycling;  Thermal expansion;  Udimet 700;  YSZ;  Zirconium yttrium alloys

Publisher

Springer

ISSN

0168-132X (series ISSN)

ISBN

9789024730933, 9024730937

Peer reviewed