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Anelastic Behavior of Plasma‐Sprayed Zirconia Coatings
Author(s) -
Liu Yajie,
Nakamura Toshio,
Dwivedi Gopal,
Valarezo Alfredo,
Sampath Sanjay
Publication year - 2008
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.1551-2916.2008.02789.x
Subject(s) - materials science , cubic zirconia , thermal barrier coating , hysteresis , temperature cycling , composite material , ceramic , thermal spraying , curvature , porosity , coating , thermal , thermodynamics , physics , geometry , mathematics , quantum mechanics
Low‐temperature thermal cycling of plasma‐sprayed zirconia coatings reveals unique mechanical responses in their curvature measurements, namely nonlinear and cyclic hysteresis, collectively termed as anelastic. These features arise from the inherent layered, porous, and cracked morphology of thermal‐sprayed ceramic materials. In this paper, the mechanisms of anelasticity are characterized by crack closure and frictional sliding models, and stress–strain relations of various thermal‐sprayed zirconia coatings were determined via an inverse analysis procedure. These results demonstrate process conditions such as powder morphology and spray parameters significantly influence the mechanical behaviors of coatings. The unique anelastic responses can be used as valuable parameters in identifying coating quality as well as process reliability in manufacturing.