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Barium Silicate Glass/Inconel X-750 Interaction

  • P. V. KelseyJr.
  • W. T. Siegel
  • D. V. Miley
Part of the Materials Science Research book series (MSR, volume 14)

Abstract

Water reactor safety programs at the Idaho National Engineering Laboratory have required the development of specialized instrumentation. An example is the electrical conductivity-sensitive liquid level transducer developed for use in pressurized-water reactors (PWRs) in which the operation of the sensing probe (Fig. 1) relies upon the passage of current through the water between the center pin of the electrode and its shell such that when water is present the resulting voltage is low, and conversely, when water is absent the voltage is high.1 The transducer’s ceramic seal is a hot-pressed glass ceramic with the following composition (mole percent): SiO2 — 55, BaO — 25, TiO2 — 5.5, CaO — 5.5, As2O5 — 3, Bi2O3 — 2, A12O3 — 2, and CeO2 — 1; its metal housing is Inconel X-750. The ceramic material provides an essential dielectric barrier between the center pin and the outer housing. The operation of the probe as well as the integrity of the PWR environment requires a hermetically-bonded seal between the ceramic and the metal. However, during testing, an increasing number of probe assemblies failed owing to poor glass-to-metal seals as well as void formation within the ceramic. Therefore, a program was initiated to characterize the metallic surface with respect to pre-oxidation treatment and determine optimum conditions for wetting and bonding of the metal by the glass to obtain baseline data relevant to production of acceptable transducer seals.

Keywords

Contact Angle Oxygen Partial Pressure Oxide Scale Sessile Drop Molten Sodium 
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.

References

  1. 1.
    W. F. Schwarz, “A Conductivity Liquid Level Detector For the Nuclear Reactor Environment,” IEEE Trans. Nucl. Sci., NS-27, 1, p. 808 (Feb. 1980).Google Scholar
  2. 2.
    C. S. Giggins and F. S. Pettit, Trans. Metall. Soc. AIME, 245, 2495–2514 (1969).Google Scholar
  3. 3.
    G. L. Wood, Oxd. Met., 2, pp. 11–57 (1970).CrossRefGoogle Scholar
  4. 4.
    G. E. Wasielewski, “Nickel-Based Superalloy Oxidation,” AFML-TR-67-30 (Jan. 1967).Google Scholar
  5. 5.
    W. H. Zachariasen, “The Atomic Arrangement in Glass,” J. Amer. Chem. Soc, 54:10 (1932).CrossRefGoogle Scholar
  6. 6.
    B. E. Warren, “Summary of Work on Atomic Arrangement in Glass,” J. Amer. Ceram. Soc, 24:8 (1941).CrossRefGoogle Scholar
  7. 7.
    J. M. Stevels, “New Light on the Structure of Glass,” Phillips Tech. Rev., 22, pp. 300–311 (1968).Google Scholar
  8. 8.
    J. A. Pask and R. M. Fulrath, “Fundamentals of Glass-to-Metal Bonding: VIII, Nature of Wetting and Adherence,” J. Amer. Ceram. Soc, 45:12, pp. 592–596 (1962).CrossRefGoogle Scholar
  9. 9.
    M. P. Borom and J. A. Pask, “Role of’Adherence Oxides’ in the Development of Chemical Bonding at Glass-Metal Interfaces,” J. Amer. Ceram. Soc, 49:1, pp. 1–6 (1966).CrossRefGoogle Scholar
  10. 10.
    J. J. Brennan and J. A. Pask, “Fundamentals of Glass-to-Metal Bonding: II, Effect of Composition on Glass-Metal Interface Reactions and Adherence,” J. Amer. Ceram. Soc, 56:2, pp. 58–62 (1973).CrossRefGoogle Scholar
  11. 11.
    M. L. Volpe, R. M. Fulrath, and J. A. Pask, “Fundamentals of Glass-to-Metal Bonding: IV, Wettability of Gold and Platinum by Molten Sodium Disilicate,” J. Amer. Ceram. Soc, 42:2, pp. 102–106 (1959).CrossRefGoogle Scholar
  12. 12.
    R. W. Clines, R. M. Fulrath, and J. A. Pask, “Fundamentals of Glass-to-Metal Bonding: V, Wettability of Iron by Molten Sodium Disilicate,” J. Amer. Ceram. Soc, 44:9, pp. 423–428 (1961).CrossRefGoogle Scholar
  13. 13.
    L. G. Hagan and S. F. Ravits, “Fundamentals of Glass-to-Metal Bonding: VI, Reaction Between Metallic Iron and Molten Sodium Disilicate,” J. Amer. Ceram. Soc, 44:9 (1961).CrossRefGoogle Scholar
  14. 14.
    R. B. Adams and J. A. Pask, “Fundamentals of Glass-to-Metal Bonding: III, Silicate Glass Containing Iron Oxide,” J. Amer. Ceram. Soc, 44:9, pp. 430–433 (1961).CrossRefGoogle Scholar

Copyright information

© Plenum Press, New York 1981

Authors and Affiliations

  • P. V. KelseyJr.
    • 1
  • W. T. Siegel
    • 1
  • D. V. Miley
    • 1
  1. 1.EG&G Idaho, Inc.Idaho FallsUSA

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