Abstract
The elastic properties and adhesion strength of double-layer coatings, produced by plasma-spray deposition of yttrium-stabilized zirconia onto a CoNiCrAlY alloy bond coat are studied. A model for determining the normal and shear stresses in a double-layer coating is developed. The fracture mechanisms in a plasma-sprayed ceramic top coat on a plasma-sprayed metallic bond coat are established. It is shown that the tensile load creates numerous cracks in the ceramic top coat that penetrate the metallic bond coat, resulting in further separation of the ceramic top coat. An increase in the thickness of the top coat alters the fracture mechanism.
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