Nanophase partially stabilized zirconia intermediate layer for strain accommodation in a multi-layer thermal barrier coating

D. N. Guru, M. Palacio, W. Mook, M. Chambers, J. Heberlein, William W Gerberich, O. Racek, C. C. Berndt

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Applying an environmental barrier coating (EBC) and a thermal barrier coating (TBC) on the next generation gas turbine structural materials such as silicon carbide matrix composites will lead to large stresses due to thermal expansion mismatch; thereby limiting the coating's effectiveness and lifetime. Nanostructured materials possess a large volume fraction of grain boundaries and are conjectured to partially relieve the strain in the coating structure. A Triple Torch Plasma Reactor (TTPR) was used to spray multi-layered TBCs consisting of a mullite EBC deposited either on a silicon carbide or a mullite substrate, a nano-phase partially stabilized zirconia coating (n-PSZ), and a yttria stabilized zirconia coating (YSZ) as the TBC. The nanostructure of the n-PSZ could be maintained during the deposition process. The coatings were heat treated at 1300°C and the change in microstructure and mechanical properties were analyzed using scanning electron microscopy (SEM), micro-indentation and scratch testing applied to the coating cross section. While a change in the microstructure was observed, in particular grain growth, the hardness and elastic modulus appeared to be little affected by the heat treatment giving a preliminary validation of the multilayer concept.

Original languageEnglish (US)
Title of host publicationProceedings of the International Thermal Spray Conference
Pages861-865
Number of pages5
StatePublished - Dec 27 2004
EventProceedings of the International Thermal Spray Conference - Osaka, Japan
Duration: May 10 2004May 12 2004

Publication series

NameProceedings of the International Thermal Spray Conference

Other

OtherProceedings of the International Thermal Spray Conference
CountryJapan
CityOsaka
Period5/10/045/12/04

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