Interactions in Coated Refractory Metal Systems

  • Arthur G. Metcalfe
  • Alvin R. Stetson
Conference paper


Typical protective coating systems for refractory metals consist of a primary oxide barrier, a secondary barrier or reservoir, and a ternary barrier formed by surface alloying the substrate. Interaction between these various barrier layers and the substrate and atmosphere form the subject of this paper. Interactions discussed in detail include: expansion mismatch; interstitial sink effects; effect of coatings on mechanical properties; diffusion problems that control coating life; and metallic claddings. Methods to solve the complex interaction effects are discussed and illustrated by low temperature oxidation problems of refractory silicide coatings, crack arresting effects of porosity in coatings, coatings containing a molten phase, and low pressure effects.


Refractory Metal Inter Metallic Compound Primary Barrier Molybdenum Disilicide Partial Molal Free Energy 
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Copyright information

© American Institute of Mining, Metallurgical, and Petrolium Engineers, Inc. 1968

Authors and Affiliations

  • Arthur G. Metcalfe
    • 1
  • Alvin R. Stetson
    • 1
  1. 1.Solar Division of International Harvester CompanyUSA

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