Combined Effect of Zr and Si on Isothermal Oxidation of Ti

TiIn this study, the combined effect of Zr and Si on isothermal oxidation of Ti for 25 and 50 h at 820°C, which is the temperature related to exhaust valves operation, was investigated.Si addition into Ti-5mass%Zr alloy led to a distribution of silicide Ti 5 Si 3 phase formed by a eutectic reaction.The Ti sample containing only Zr showed more retarded oxidation rate than Ti-6Al-4V, the most prevalent Ti alloy, at the same condition.However, while a simultaneous addition of Zr and Si resulted in greater increase of oxidation resistance.The oxide layer formed after the addition of Zr and Si comprised TiO 2 , ZrO 2 , and SiO 2 .