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Oxidation of Metals

, Volume 80, Issue 3–4, pp 219–230 | Cite as

A Study on Effect of Reactive and Rare Earth Element Additions on the Oxidation Behavior of Mo–Si–B System

  • Sanjib MajumdarEmail author
  • S. Burk
  • D. Schliephake
  • M. Krüger
  • H.-J. Christ
  • M. Heilmaier
Original Paper

Abstract

Mo–9Si–8B–1Ti, Mo–9Si–8B–1.8Ti, Mo–9Si–8B–0.2La and Mo–9Si–8B–0.4La2O3 (at.%) alloys were prepared using mechanical alloying followed by hot isostatic pressing and field assisted sintering. XRD, SEM and EBSD analysis confirmed the formation of Mo solid solution, A15 and T2 phases in the alloys. Isothermal oxidation behavior of the specimens was studied in the temperature range from 750 to 1,300 °C for up to 100 h. Both the Ti and La containing alloys showed superior oxidation behavior compared to unalloyed Mo–Si–B at 900 °C at the initial periods of oxidation. Ti-added alloys suffered higher rate of weight loss at higher temperatures (1,000–1,300 °C) due to the formation of non-protective low viscosity SiO2-TiO2-B2O3 scale. La-alloyed Mo–Si–B showed superior oxidation resistance at intermediate temperatures (900 °C) as well as at higher temperatures. Enrichment of La at the oxide/alloy interface was found to be the reason for improved oxidation behavior of La-alloyed Mo–Si–B. Amongst the four materials studied, the La2O3 containing alloy showed the best oxidation resistance at 900 °C.

Keywords

Mo–Si–B system Catastrophic oxidation Micro-alloying Reactive and rare earth elements 

Notes

Acknowledgments

S. Majumdar wishes to thank Alexander von Humboldt Foundation, Bonn for financial support of the research stay at Siegen. The research support by Deutsche Forschungsgemeinschaft (DFG) within the framework of the research unit 727 “Beyond Ni-Base Superalloys” is gratefully acknowledged.

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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • Sanjib Majumdar
    • 1
    • 4
    Email author
  • S. Burk
    • 1
  • D. Schliephake
    • 2
  • M. Krüger
    • 3
  • H.-J. Christ
    • 1
  • M. Heilmaier
    • 2
  1. 1.Institut für WerkstofftechnikUniversität SiegenSiegenGermany
  2. 2.Institut für Angewandte Materialien-Werkstoffkunde (IAM-WK), Karlsruhe Institute of Technology (KIT)KarlsruheGermany
  3. 3.Institut für Werkstoff- und FügetechnikUniversität MagdeburgMagdeburgGermany
  4. 4.Materials Processing DivisionBhabha Atomic Research CentreMumbaiIndia

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