The current level of development of technology requires an increase in the speed of machines and mechanisms, a corresponding improvement in the durability of wear resistance of industrial mechanisms, an increase due to this service life of machine parts. An economic and technical alternative to expanding the production of spare parts for existing mechanical objects is the reuse of worn-out parts restored during the repair of units A set of issues related to the strength of coatings made with the use of plasma spraying in terms of studying the quality of the coating using both well-known techniques and using new developments of technical means of research is considered. Methods of ensuring the strength (adhesion) of coatings and methods of their control with the development of new versions of powder materials that provide the required quality of the protective layer are analysed. Particular attention is paid to the strength of the coating under thermal loads and overloads typical for the operation of gas turbine engines and installations. The stress state of the coating is described based on the developed mathematical modelling. Some directions of further development of the method of plasma spraying are presented, while impulse effects on the technological process of spraying are noted.