Influence of Superficial Titanium Based Ceramic Coating on the Isothermal Oxidation Behavior of High Speed Steels

Abstract

This work concentrates on the beneficial effects of Titanium-based ceramic coating on the oxidation behavior of high-speed steels. Two types of high-speed steels with varying concentrations of chromium have been investigated by the gravimetric analysis method. Physical Vapour Deposition (PVD) technique was used to coat TiAlN on the steel specimens, and the isothermal oxidation behavior is studied at temperatures, namely 600^oC, 700^oC, and 800^oC. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) analyses were used to analyze the steel specimens' surface before and after the oxidation process. Rapid oxidation is observed at the initial stages of oxidation, and a decrease in oxidation rate was obtained concerning an increase in oxidation time. When the temperature increases, the oxidation resistance decreases. More important chromium content specimen shows improved oxidation resistance. In comparison, a threefold increase in oxidation resistance was observed with specimen coated with TiAlN.