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Plasma-sprayed duplex and graded partially stabilized zirconia thermal barrier coatings: Deposition process and properties

Musil, J.; Alaya, M.; Oberacker, R.

Abstract:
Atmospheric plasma spraying of duplex and graded ZrO2 (8% Y2O3) thermal
barrier coatings (TBCs) on Inconel 617 substrate with a NiCrAIY bond
coat is described in terms of a deposition process of controlled
coating structure, Special attention is devoted to the dominant spray
parameters and the injector configuration for powder feeding, which
play a fundamental role in graded coating deposition with controlled
formation of a graded metal-ceramic (GMC) intermediate zone, The
results of the graded coating spraying allow: (a) suppression of
step-interface effects, (b) suppression of large differences (misfit)
between physical and mechanical constants of the coating and those of
the substrate material, and (c) favorable intergrowth of crystallites
for a microstructurally integrated structure, Sprayed TBCs were
investigated and compared with regard to their thermal cycling,
oxidation behavior, and mechanical properties.
The influence of crystal anisotropy changes on the resulting coating
structure and properties is shown, On the basis of finite element (FE)
calculations, the stress distribution within thermally cycled coat ... mehr


Zugehörige Institution(en) am KIT Institut für Keramik im Maschinenbau (IKM)
Publikationstyp Zeitschriftenaufsatz
Jahr 1997
Sprache Englisch
Identifikator ISSN: 1059-9630
KITopen ID: 1000007707
Erschienen in Journal of Thermal Spray Technology
Band 6
Heft 4
Seiten 449-455
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