Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/41636

Title

Structural integrity of thermal barrier coatings by acoustic emission studies

Author(s)

Shankar, N. Ravi;  Berndt, Christopher C.;  Herman, Herbert

Abstract

This work describes acoustic emission (AE) experiments which have been carried out to study the deformation modes of plasma-sprayed ZrO//2-20 wt % MgO coatings subjected to tensile adhesion tests. Heat treatment of the coating changed the AE distribution and the fracture morphology, and this is ascribed to a change in the cracking process of the coating. Diffusion of Fe into the coating and sintered nature of the heat treated coatings play a part in increasing bond strength. Results show that AE methodology can be correlated to the TBC structure and bond strength, and these give insight into fundamental design criteria to improve coating integrity and performance.

Publication type

Conference paper

Source

DVS Berichte (Deutscher Verband fur Schweisstechnik): Paper presented to the 10th International Thermal Spraying Conference, Essen, Germany, 02-06 May 1983, Vol. 80, pp. 41-45

Publication year

1983

Keyword(s)

Acoustic emission;  AE;  Fracture surfaces;  Gas turbines;  Heat treatment;  Metallizing;  Microscopic examination of coatings;  Protective coatings;  Zirconia-magnesia coatings

Publisher

Deutscher Verband fur Schweisstechnik

ISSN

0418-9639 (series ISSN)

ISBN

9783871553851, 3871553859

Peer reviewed