Oxidation-resistant coatings for application on high-temperature titanium alloys in aeroengines

High-temperature application of titanium alloys in aeroengines is often lim ited by their insufficient resistance to the aggressive environment. Magnet ron-sputtered Ti-Al based coatings were developed in order to increase the maximum service temperature of conventional titanium alloys from the presen t 520-600 degrees C, the temperature limit set by the mechanical capabiliti es of most advances alloys. The coatings not only demonstrated excellent ox idation resistance but also demonstrated beneficial effects on mechanical p roperties. Most importantly, the fatigue behavior of the substrate alloys w as not degraded, a major hurdle for coating application on titanium alloys so far. Initial results on Cr-containing Ti-Al based coatings indicated sig nificant potential for application on titanium aluminides.