Abstract
Adhesion/cohesion testing represents one of the most common methods for benchmarking and optimization of thermal spray coatings. However, owing to the inhomogeneous coating microstructure, such testing may be quite troublesome. In this study, adhesion/cohesion strength of representative metallic and ceramic coatings deposited by water-stabilized plasma (WSP) spraying was evaluated by four different methods: tensile adhesion test, pin test, tubular coating tensile test, and shear test. Combination of various methods enabled the evaluation of the coating adhesion/cohesion strength under different loading conditions. Limitations and benefits of each method for testing of WSP coatings are demonstrated. Dominating failure micromechanisms were determined by supplementary fractographic analysis.
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