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Metals and Materials International

, Volume 14, Issue 1, pp 1–7 | Cite as

Oxidation resistance coatings of Mo−Si−B alloys via a pack cementation process

  • J. S. Park
  • J. M. Kim
  • H. Y. Kim
  • S. Yi
  • J. H. Perepezko
Article

Abstract

Oxidation behavior of Si pack cementation coatings on a three-phase Mo−Si−B alloy was examined. During Si pack cementation of a three-phase Mo−Si−B alloy, a MoSi2 outer layer was synthesized on the exterior layer. Following oxidation in air of the pack-coated alloys at 1200°C, the MoSi2 phase layer was consumed and replaced by the Mo5Si3 (or T1) phase. The synthesized T1 phase provided excellent oxidation resistance when exposed to high temperatures. The silicide-coated alloys exhibit higher oxidation resistance compared with uncoated Mo−Si−B alloys. The enhanced oxidation behavior and its mechanism are discussed in terms of the thicknesses of the oxide layers under exposure to high temperatures.

Key words

pack cementation oxidation resistance Mo−Si−B alloy 

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Copyright information

© Springer 2008

Authors and Affiliations

  • J. S. Park
    • 1
  • J. M. Kim
    • 1
  • H. Y. Kim
    • 1
  • S. Yi
    • 2
  • J. H. Perepezko
    • 3
  1. 1.Advanced Materials EngineeringHanbat National UniversityDaejeonKorea
  2. 2.Materials Science and Metallurgical EngineeringKyungpook National UniversityDaeguKorea
  3. 3.Materials Science & EngineeringUniversity of Wisconsin-MadisonMadisonUSA

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