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Thermal barrier coatings are often used to protect metal blades in gas turbine engines operating in an aggressive high-temperature environment. The most important factor determining the durability of thermal barrier coatings is the growth of a thermal oxide layer on the boundary layer that forms during oxidation at high temperatures. One of the reasons for the degradation of these coatings is the growth and connection of cracks, which ultimately leads to the failure of the coating. The aim of this research is to increase the durability of the thermal barrier coating and delay its failure by using a self-healing silicon agent. In this study, two groups of samples, a conventional thermal barrier coating and a self-healing thermal barrier coating with silicon powder, were applied by atmospheric plasma spraying. The coatings were characterized by metallographic examinations using a scanning electron microscope (SEM). The thermal shock resistance of the samples was also tested and compared. The observations from the experiments showed that the repair bilayer coating is a more suitable combination for use as a self-healing coating on the substrate. According to the results of the experiments and the review of available research sources, using these coatings to improve the thermal insulation and resistance to oxidation and hot corrosion of the blades can be considered desirable.

Keywords: Thermal barrier coating, self-healing coating, thermal shock resistance, high-temperature oxidation, hot corrosion

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