Evaluation of Thermal-Sprayed Bronze Abradable Coatings: Effect of Temperature and Time on Coating Microstructure and Performance PUBLIC ACCESS

[+] Author Affiliations
Zaher Z. Mutasim, Lulu L. Hsu

Solar Turbines Incorporated, San Diego, CA

Paper No. 93-GT-371, pp. V03CT17A032; 9 pages
  • ASME 1993 International Gas Turbine and Aeroengine Congress and Exposition
  • Volume 3C: General
  • Cincinnati, Ohio, USA, May 24–27, 1993
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7892-7
  • Copyright © 1993 by ASME


Metallurgical evaluation was conducted on thermally-sprayed bronze coatings that are commonly found in gas turbine labyrinth seals. These bronze coatings serve as abradable surfaces for air/air and air/oil seals operating at low temperatures. As-coated and post-oxidation coating microstructures were examined metallographically to establish the coating’s functional life at various operating temperature ranges. Oxidation tests at several temperatures and times were carried out in order to construct a time-temperature map that could be used to predict the useful life of this bronze coating as correlated to gas turbine bronze seals returned from field service. Scanning electron microscopy in conjunction with polarized light microscopy were utilized to identify the presence of red cuprous oxide, a key factor in the determining the extent of internal oxidation.

Copyright © 1993 by ASME
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