METHODS FOR IMPROVING STRESS-STRAIN PROPERTIES AND TRIBOLOGICAL CHARACTERISTICS OF HEAVILY LOADED METAL AND POLYMER TRIBOSYSTEMS

An approach for transformation of destructive friction force to creative one in metal polymer friction units including a wide class of friction and antifriction tribomaterials, as well as lubricants, is presented in the article. For metal tribosystems, the research of nitride, diamond-like (DLC), high-energy coatings (HEC) is presented as creative possibilities. The main modern coating methods are viewed: vacuum arc deposition method of coatings, magnetron spraying method, ion vapor deposition of carbon coatings of the DLC class. The features of high-entropy coatings (HPC) and coatings with form memory effect (FME) are discussed. The main advantages and disadvantages of these methods are described, as well as modern types of coatings obtained by the PVD method are presented. Materials and research methods are given, including deposition of coating by BRV600 installation, investigation of physical and mechanical properties, tribological tests. To obtain high indicators of physical and mechanical properties and tribological characteristics, the following parameters were determined: for nitride coatings CrAlSiN - the optimal thickness, for carbon coatings of the DLC class and combined coatings CrAlSiN + DLC – the optimal coating thickness and technological modes of coating deposition - the amount of nitrogen supply %N and the current of induction coils λ, for high-energy coatings TiCrZrHfNb is the coating thickness, and for CuCrMnFeCoNi the effect of copper on the friction ratio and wear resistance. To obtain high indicators of physical and mechanical properties and tribological characteristics, the following parameters were determined: for nitride coatings CrAlSiN – the optimal thickness, for carbon coatings of the DLC class and combined coatings CrAlSiN + DLC – the optimal coating thickness and technological modes of coating deposition – the amount of nitrogen supply %N and the current of induction coils λ, for high-energy coatings TiCrZrHfNb is the coating thickness, and for CuCrMnFeCoNi the effect of copper on the friction ratio and wear resistance. The obtained coatings have found their application in heavily loaded tribosystems: the blades of the turbocharger of the 2TE25A diesel locomotive and the spline connection of the transmission of the steering rotor of the MI-26 helicopter. High-entropy coatings are proposed for dampers that are installed in the attachment points of the engine to the pylon or the pylon to the wing of the long-haul aircraft.

mechanical engineering, tribology, methods for obtaining vacuum coatings, DLC coatings, high-entropy coatings, coatings with form memory effect, friction and anti-friction units