Abstract
For plasma heat-protective coatings with a ceramic layer based on zirconium dioxide, the influence of the duration of high-temperature exposure (1100 °C, 2—100 h) and subsequent cyclic deformation in the elastic region, as well as the ratio of the thicknesses of the ceramic and intermediate metal layers on the micromechanical characteristics (Young's modulus, kinetic hardness parameters, plastic deformation and creep) and flexural strength, assessed by instrumental indentation, has been studied. It was that in the case of thermal exposure lasting up to 2 hours, the Young's modulus, the characteristics of kinetic hardness and the strength of the coating were significantly reduced, and the proportion of energy spent on plastic deformation, as well as creep, increased. With an exposure duration of 50 hours or more, the kinetic microhardness characteristics increase, and the plasticity characteristics decrease. The greatest strength of the coating was obtained when the ratio of the thicknesses of the metal sublayer and the ceramic layer was 0.2—0.3. Keywords: heat-protective coating, thermal operating time, deformation aging, kinetic microindentation, micromechanical properties.
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