Properties of Coated Refractory Metals

  • W. A. Gibeaut
  • E. S. Bartlett

Summary

This report summarizes the information generated since the middle of 1961 on the chemical, physical, and mechanical properties of refractory metals that are coated with oxidation-resistant coatings of advanced-experimental or commercial status. It is a supplement to DMIC Report 162, “Coatings for the Protection of Refractory Metals from Oxidation”, dated November 24, 1961. Recent data on specific silicide- and aluminidetype coatings for columbium, molybdenum, tantalum, and tungsten and their alloys reflect general advances in coating quality and performance, understanding of the behavior of coated systems, and more complete realization of the problems associated with the use of coated hardware.

Programs to provide comparative evaluations of coatings on columbium and molybdenum alloys have pointed up some of the relative merits and deficiencies of the various coatings. Properties that have been studied and evaluated in recent investigations have included the following:
  1. (1)

    Oxidation lives at various temperatures and pressures

     
  2. (2)

    Degradation in low-temperature ductility of substrates by coatings or coating processes.

     
  3. (3)

    Degradation of mechanical properties by oxidation exposure (thermal stability)

     
  4. (4)

    Effects of strain at low and high temperatures on protectiveness of coatings

     
  5. (5)

    Stress rupture and creep data of coated systems

     
  6. (6)

    Fatigue properties of coated systems

     
  7. (7)

    Emittance of coatings.

     

Although there is no “ideal” coating for a given application, the data now available may permit selection of a coating or coatings based on a balance of performance features such as those listed above. Continued detailed evaluation and general comparative programs are expected to greatly improve the ability to select a coating-substrate system best suited for given design requirements.

Generally, the areas involving coated tantalum and tungsten alloy substrates are not so well developed; there are fewer coatings available and data are more limited.

Keywords

Oxidation Test Coated Specimen Spectral Normal Emittance Pack Cementation Uncoated Specimen 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1966

Authors and Affiliations

  • W. A. Gibeaut
  • E. S. Bartlett

There are no affiliations available

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