The Less Common Refractory Metals (Rhenium, Technetium, Hafnium, Noble Metals)

  • Joseph Maltz
Conference paper


Previous reviews of the status of the less-common refractory metals are cited and supplemented with discussions of newer developments. The physical metallurgy of rhenium and of technetium, an artificial element which has only recently become available in sufficient amount for metallurgical studies to be possible, are surveyed. New data on phase equilibria, mechanical and physical properties and availability are included. Special attention is also given to the roles of hafnium-tantalum alloys and of iridium as oxidation-resistant coatings suitable for special situations. Insofar as the potential usage of the less common refractory metals in applications which depend upon their high melting point is concerned, high cost and low availability preclude any radical changes in the near future. Instead, an orderly growth is indicated as research pinpoints the occasional unique benefits which can justify their very high cost.


Refractory Metal Platinum Metal Oxide Dispersion Strengthen Recession Rate Clothe Sheet 
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Copyright information

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

Authors and Affiliations

  • Joseph Maltz
    • 1
  1. 1.National Aeronautics and Space AdministrationUSA

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