Interface Control for Enhanced Performance of Hard Protective Coatings
(Room Wabash 2)
12 May 16
9:00 AM
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9:20 AM
Tracks:
Protective, Tribological and Decorative Coatings
Interface engineering is essential in maintaining and even further enhancing the performance of protective coatings on metallic substrates throughout the component’s lifetime. In particular, enhanced adhesion and stress control of the coating are of great importance in order to minimize wear, and to improve durability and fatigue debit. Consequently, the objective of this study is to identify the effects of different treatments on the interfacial strength and stress level in the coatings. In this work we present a systematic study of the influence of substrate pre-treatment on the stress and adhesion of hard TiN-based coatings deposited by reactive magnetron sputtering onto titanium, iron and nickel alloy substrates. More specifically, we investigate the effects of different pre-treatment approaches namely RF-Plasma ion bombardment, metallic interlayer deposition and HiPIMS ion implantation. The behavior of the coating/substrate interface was probed through micro-scratch testing and correlated to the mechanical properties and the residual stress. A finite element model (FEM) simulating the scratch tests has also been developed. Using this model we investigate the influence of the mechanical properties, and of the coating residual stress, on the adhesive failure modes. We will demonstrate that FEM modeling is an important tool for the design of coating architectures suitable for advanced industrial applications.