TY JOUR TI RESEARCH OF TRIBOLOGICAL PROPERTIES OF COATINGS OF PISTON RINGS OF A MARINE INTERNAL COMBUSTION ENGINE KW piston rings KW deposition KW ion-plasma coating KW durability KW lock KW cast iron KW tribological characteristics JO Operation of Maritime Transport AU VOLINTIRU, O.. AU VASILESCU, M.. AU Epikhin, A.I. AU Toriya, T.G. AU Somko, M.L. AU Modina, M.A. PY 2022 IS PB Budget Educational Institution of Higher Education “Admiral Ushakov State Maritime University”