ANALYSIS OF THERMOMECHANICAL COMPATIBILITY OF PHASES IN MULTILAYER MOSI2–MEB2–(TI, MO) COATINGS

Abstract

This work presents a finite element study of the thermomechanical compatibility of multilayer gradient coatings MoSi₂–MeB₂–(Mo, Ti) on an Inconel 718 substrate. The stress and deformation fields in the coatings were analyzed during cooling from 1000 °C to 20 °C. Coatings with Mo as the buffer layer showed high stability at elevated temperatures, while Ti as a buffer improved plastic accommodation but increased residual stresses in some layers. Among the studied compositions, MoSi₂–ZrB₂–10 SiC–Mo demonstrated the lowest stress levels (~100 MPa) and the highest thermomechanical stability under cyclic thermal loading. The results highlight the importance of selecting appropriate barrier and buffer layers to minimize thermal stresses and ensure coating integrity in high-temperature applications.