Numéro
J. Phys. IV France
Volume 03, Numéro C7, Novembre 1993
The 3rd European Conference on Advanced Materials and Processes
Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés
Page(s) C7-1013 - C7-1016
DOI http://dx.doi.org/10.1051/jp4:19937158
The 3rd European Conference on Advanced Materials and Processes
Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés

J. Phys. IV France 03 (1993) C7-1013-C7-1016

DOI: 10.1051/jp4:19937158

Microstructure of yttria stabilized zirconia-hafnia plasma sprayed thermal barrier coatings

H. IBÉGAZÈNE, S. ALPÉRINE and C. DIOT

ONERA, Materials Science Department, BP. 72, 92322 Châtillon cedex, France


Abstract
Hafnia is an attractive candidate to build reliable and durable thermal barrier systems, due to its similarity to zirconia and its elevated structural transformation temperatures. We report here structural investigations of various plasma sprayed coatings composed of ZrO2 + x mole % HfO2 (x = 0, 25, 50 and 100), partially stabilized by 4.53 mole % yttria. X-Ray diffraction studies and TEM investigations show that, a metastable, non transformable, high yttrium content, t' phase is the only phase observed on the as-sprayed samples. Such results has not been yet related in the literature.



© EDP Sciences 1993