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Long-term behaviour and application limits of plasma-sprayed ZrO2 thermal barrier coatings

Langjahr, P. A.; Oberacker, R.; Hoffmann, M. J.

Abstract:
Investigations of changes in phase composition, mechanical properties,
and microstructure of ZrO2-based plasma-sprayed thermal barrier
coatings (TBCs) with 8 mol% CeO2, 19.5 mol% CeO2/1.5 mol% Y2O3, 35 mol%
CeO2, and 4.5 mol% Y2O3 after long-term heat treatments at typical
operation temperatures (1000 degrees -1400 degreesC) are presented.
Experimental studies include X-ray diffractometry, mechanical testing,
and scanning electron microscopy. Thermal cycling experiments also have
been performed. TBCs with g mol % CeO2 contain mainly the tetragonal
equilibrium phase and, therefore, show rapid failure because of the
high amount of tetragonal --> monoclinic phase transformation, even
after relatively short heat treatments (1250 degreesC/1 h), In the case
of the other systems that consist mainly of the tetragonal or cubic
nonequilibrium phases, TBCs with 19.5 mol% CeO2/1.5 mol% Y2O3 or 35
mol% CeO2 reveal a smaller amount of monoclinic phase after long-term
heat treatments (1250 degreesC/1000 h) compared with TBCs containing
4.5 mol% Y2O3. TBCs containing 35 mol% CeO2 show a higher degree of
sintering than the TBCs wi ... mehr


Zugehörige Institution(en) am KIT Institut für Keramik im Maschinenbau (IKM)
Publikationstyp Zeitschriftenaufsatz
Jahr 2001
Sprache Englisch
Identifikator ISSN: 0002-7820
KITopen ID: 1000007685
Erschienen in Journal of the American Ceramic Society
Band 84
Heft 6
Seiten 1301-1308
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