Archives of Metallurgy and Materials (Oct 2018)

Combined Effect of Zr and Si on Isothermal Oxidation of Ti

  • S.-H. Ha,
  • B.-H. Kim,
  • Y.-O. Yoon,
  • H.-K. Lim,
  • S.K. Kim

DOI
https://doi.org/10.24425/123837
Journal volume & issue
Vol. vol. 63, no. No 3
pp. 1493 – 1495

Abstract

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In 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 Ti5Si3 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 TiO2, ZrO2, and SiO2.

Keywords