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Creep Behavior of Plasma‐Sprayed Zirconia Thermal Barrier Coatings
Author(s) -
Soltani Reza,
Coyle Thomas W.,
Mostaghimi Javad
Publication year - 2007
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2007.01822.x
Subject(s) - materials science , creep , cubic zirconia , thermal barrier coating , composite material , yttria stabilized zirconia , ceramic , coating , thermal conductivity
Thermally sprayed ceramic coatings deposited from nanostructured feedstock powder have often demonstrated improved properties relative to coatings produced from conventional powders. This type of coating has been reported to exhibit better wear resistance and higher adhesion strength compared with conventional deposits. Powder consisting of hollow spherical particles has been reported to produce coating with lower unmelted particles and lower thermal conductivity. In this study, the thermo‐mechanical properties of plasma‐sprayed yttria‐stabilized zirconia coatings deposited using each of these types of powder were investigated. Creep strain and creep rate were measured using free‐standing thick coatings loaded in a four‐point bend configuration at temperatures ranging from 800° to 1200°C in air under a range of loads. The creep exponent and activation energy were determined.