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Microstructural Features of Oxide Scales Formed on Zirconium Diboride Materials

  • H. C. Graham
  • H. H. Davis
  • I. A. Kvernes
  • W. C. Tripp
Part of the Materials Science Research book series (MSR, volume 5)

Abstract

Both ZrB2 and ZrB2 + 20 v/o SiC have been oxidized in oxygen over the range 900° to 1500°C. The microstructural features of the oxide scales formed under these conditions are studied as a function of temperature and reaction time. Techniques used to characterize the oxide products include x-ray diffraction, scanning electron microscopy and electronprobe microanalysis. A glassy B2O3 is one of the oxidation products at temperatures below 1100°C, resulting in protective behavior. At higher temperatures the formation of an SiO2-base glass imparts additional protection to ZrB2 + 20 v/o Sic.

Keywords

Oxide Scale Boron Oxide Glass Layer Columnar Growth Gravimetric Data 
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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References

  1. 1.
    E. V. Clougherty, K. E. Wilkes, and R. P. Tye, Research and Development of Refractory Oxidation-Resistance Diborides. AFML-TR-68-190, Part I I Vol. V (Nov. 1969).Google Scholar
  2. 2.
    L. Kaufman and H. Nesor, Stability Characterization of Refractory Materials under High Velocity Atmospheric Flight Conditions. AFML-TR-69-84, Part I II Vol I (Sept. 1969).Google Scholar
  3. 3.
    W. C. Tripp and H. C. Graham, Thermogravimetric Study of the Oxidation of ZrB in the Temperature Range of 800° to 1500°C, accepted for publication, J. Electrochem. Soc.Google Scholar
  4. 4.
    W. C. Tripp and H. C. Graham, J. Electrochem. Soc. 117 255 (1970).Google Scholar
  5. 5.
    W. C. Tripp and H. C. Graham, Bull. Am. Cer. Soc. 49 394 (1970).Google Scholar
  6. 6.
    H. C. Graham and W. C. Tripp, p. 9-1 in AGARD Conference Proceedings No. 52, Reactions Between Gases and Solids. 1969.Google Scholar
  7. 7.
    W. C. Tripp, Relationship Between Point Defects and Charge and Mass Transport. Systems Research Laboratories, Inc. Report No. 6390-11-7 (April 1970).Google Scholar
  8. 8.
    H. C. Graham, W. C. Tripp, and H. H. Davis, “Microbalance Techniques Associated with Oxidation Studies”, presented at Ninth Conference on Vacuum Microbalance Techniques, West Berlin, June 1970. To be published by Plenum Press.Google Scholar
  9. 9.
    W. C. Tripp and H. C. Graham, Air Force Research Review, 1 (July-August 1970 ).Google Scholar
  10. 10.
    J. R. Soulen, P. Sthapitanonda, and J. L. Margrave, J. Am. Chem. Soc. 59 132 (1955).Google Scholar

Copyright information

© Plenum Press, New York 1971

Authors and Affiliations

  • H. C. Graham
    • 1
  • H. H. Davis
    • 1
  • I. A. Kvernes
    • 1
  • W. C. Tripp
    • 2
  1. 1.Aerospace Research LaboratoriesWright-Patterson AFBUSA
  2. 2.Systems Research LaboratoriesDaytonUSA

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