Process Development for Innovative Iron Alloy Metallic Glass Coatings

Bulk metallic glasses exhibit high corrosive resistance, good tribological behavior, and low thermal conductivity. The production of metallic glass using Thermal Spray technology is a novel approach. In this study, the manufacturing of iron-based metallic glass coatings by high velocity oxygen fuel spraying is investigated. For this purpose individually designed, amorphous feedstock materials are used. By means of X-Ray-Diffraction and Differential Scanning Calorimetry amorphous structures are identified. Subsequently, the thermal diffusivities are determined by means of Laser-Flash method. The low thermal diffusivity measured proves the potential of metallic glasses as thermal barrier coatings for low temperature applications, such as combustion engines.