Bending fatigue failure of atmospheric-plasma-sprayed CoNiCrAlY+YSZ thermal barrier coatings
Source abstract
Abstract
Abstract Bending fatigue failure of conventional atmospheric-plasma-sprayed CoNiCrAlY + ZrO2–8 wt.% Y2O3 thermal barrier coatings with/without the thermally grown oxide layer generated between the bond coat and the top coat was experimentally studied at room temperature. Microscopical and profilometrical characterization of as-received and fractured specimens and a simplified finite element study of cooling thermal stresses show that the same fatigue strength of both the as-coated and the oxidized specimens (i.e. its insensitivity to the presence of the thermally grown oxide) is most likely caused by a preferential through-the-thickness cracking of the thermally grown oxide layer. Moreover, the bond-coat/substrate interface is identified as the weakest part of the studied thermal barrier system under both low and high crack growth rates.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: High-Temperature Coating Behaviors · Nuclear Materials and Properties · Advanced materials and composites
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