Superior surface protection governed by optimized interface characteristics in WC/DLC multilayer coating

This paper introduces a highly durable functional multilayer coating (FMCs) with outstanding mechanical properties using comprehensive design principles. Architecting the layers with degrees of freedom in structure and thickness is the core idea to design WC/DLC FMC. This concept seeks to combine advantages of superior properties of single-layer metal, ceramic, and carbon coatings, without compromising with weaknesses. This research creates a pioneering integration platform that combines the current understanding of materials properties across scale and optimization of interfacial characteristics of ultra-thin films through the combination of theoretical and experimental studies. The aim of this study is to introduce a significant improvement for multilayer sustainability of properties and mechanical strength such as ultra-high hardness (>45 GPa) combined with high elasticity (H/E ~0.15), creep deformation recovery and ultra-durability in macro-scale wear (wear rate