Chapter 27. Sodium Reaction with High-Pressure Sodium Lamp Materials

  1. William Smothers
  1. V. Rohe and
  2. C. M. Schoene

Published Online: 26 MAR 2008

DOI: 10.1002/9780470320228.ch27

Proceedings of the 8th Annual Conference on Composites and Advanced Ceramic Materials: Ceramic Engineering and Science Proceedings, Volume 5, 7/8

Proceedings of the 8th Annual Conference on Composites and Advanced Ceramic Materials: Ceramic Engineering and Science Proceedings, Volume 5, 7/8

How to Cite

Rohe, V. and Schoene, C. M. (2008) Sodium Reaction with High-Pressure Sodium Lamp Materials, in Proceedings of the 8th Annual Conference on Composites and Advanced Ceramic Materials: Ceramic Engineering and Science Proceedings, Volume 5, 7/8 (ed W. Smothers), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470320228.ch27

Author Information

  1. GTE Lighting Products Sylvania Lighting Center Danvers, MA 01923

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1984

ISBN Information

Print ISBN: 9780470374139

Online ISBN: 9780470320228

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Keywords:

  • current high-pressure sodium (HPS) lamp;
  • lamp design;
  • sodium aluminate deposits;
  • metallic sodium recovery;
  • sodium reaction

Summary

Reactions of sodium metal with the polycrystalline alumina (PCA) arc tube and the ceramic-metal end seals of high-pressure sodium (HPS) lamps at lamp arc-tube temperatures in the range of 700° to 1200°C were studied. The distributions of metallic sodium and sodium reaction products throughout lamps aged 2 000 to 23 000 h were quantitatively determined with successful recovery of 94 to 99% of the initial sodium charge. Chemical treatments for arc tubes were developed which successfully distinguished between metallic Na, NaAlOi2 and Naβ or β “-aluminas. The most extensive sodium reactions occurred with the ceramic-metal seals and the interior arc-tube surface.