| AVS 64th International Symposium & Exhibition | |
| Advanced Surface Engineering Division | Wednesday Sessions |
| Session SE+2D+NS+SS+TF-WeA |
| Session: | Nanostructured Thin Films and Coatings |
| Presenter: | Samir Aouadi, University of North Texas |
| Authors: | S.M. Aouadi, University of North Texas C. Muratore, University of Dayton A.A. Voevodin, University of North Texas |
| Correspondent: | Click to Email |
This talk will provide an overview of the latest research developments in the design and exploration of hard coatings with high temperature adaptive behavior in tribological contacts. The initial focus of the talk will be on understanding the major mechanisms that lead to a reduction in friction and/or wear in high temperature lubricious oxides. Adaptive mechanisms will also be discussed and will include metal diffusion and formation of lubricant phases at worn surfaces, thermally- and mechanically-induced phase transitions in hexagonal solids, contact surface tribo-chemical evolutions to form phases with low melting point, and formation of easy to shear solid oxides. All of these adaptive mechanisms are combined in nanocomposite coatings with synergistic self-adaptation of surface structure and chemistry to lubricate from ambient temperatures to 1000 °C and provide surface chemical and structural reversibility during temperature cycling to maintain low friction coefficients. Changes in the structural and chemical properties of these materials as a function of temperature will be correlated to their mechanical and tribological performance using a range of experimental tools in addition to simulations based on ab initio calculations and molecular dynamics simulation methods. This review also includes a discussion of the industrial applications of these coatings as well as of potential improvements to the coating design and other anticipated future developments.