Work

Chromia layer growth on a Ni-based superalloy: Sub-parabolic kinetics and the role of titanium

Year: 2013

Type: article

Abstract: Oxidation of the Ni-based superalloy RR1000 has been undertaken in air over the temperature range 600–900 °C for times up to 5000 h. The surface oxide consisted of a protective Ti-doped chromia layer but with rutile forming on its outer surface. Sub-surface oxidation of Al and Ti also occurred. The thickening kinetics of the chromia layer were sub-parabolic with initial rates around two orders of magnitude higher than expected for Ti-free chromia. This enhancement and the sub-parabolic kinetics are accounted for by Ti-doping of the chromia layer. Over time the enhancement reduced because of Ti-depletion in the alloy.

Source: Corrosion Science

DOI: 10.1016/j.corsci.2013.05.016

Authors: S. Cruchley, H.E. Evans, M.P. Taylor, M.C. Hardy, S. Stekovic

Institutions: University of Birmingham, Rolls-Royce (United Kingdom), Linköping University

Language: English

Topic: High-Temperature Coating Behaviors

Subfield: Surfaces, Coatings and Films

Field: Materials Science

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $4,070

Funder: Engineering and Physical Sciences Research Council