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Novel Ceramic Abradable Coatings With Enhanced Performance

[+] Author Affiliations
Dieter R. Sporer

Sulzer Metco (Canada), Inc., Sonthofen, Germany

Ulrike Taeck, Andrew R. Nicoll

Sulzer Metco AG (Switzerland), Wohlen, Switzerland

Mitchell R. Dorfman

Sulzer Metco (US), Inc., Westbury, NY

Massimo Giannozzi

GE Oil&Gas – Nuovo Pignone, Florence, Italy

Iacopo Giovannetti

University of Florence, Florence, Italy

Paper No. GT2006-90993, pp. 1017-1023; 7 pages
doi:10.1115/GT2006-90993
From:
  • ASME Turbo Expo 2006: Power for Land, Sea, and Air
  • Volume 4: Cycle Innovations; Electric Power; Industrial and Cogeneration; Manufacturing Materials and Metallurgy
  • Barcelona, Spain, May 8–11, 2006
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-4239-8
  • Copyright © 2006 by ASME

abstract

Abradable coatings are employed in modern gas turbine engines to minimize clearance and reduce over-tip leakage by allowing blade tips to cut into the coating. While such clearance control coatings have been used in the compressor modules of jet engines and stationary gas turbines for many years, their use in the High Pressure (HP) section of turbine modules is relatively new. Because of the high temperatures encountered there, ceramic materials must be used to provide a durable seal. In this paper the performance of two novel ceramic abradable seal coatings is reviewed and compared to a baseline system. Emphasis is placed on the resistance to thermal shock and erosion. The abradability of coatings by hard tipped blades is reviewed using a wear map consisting of five distinctly different rub test conditions. Among the coatings considered, an APS sprayed dysprosia stabilized zirconia ceramic abradable offers a potentially superior combination of thermal shock resistance, abradability and erosion resistance for high temperature turbine seal applications.

Copyright © 2006 by ASME
Topics: Coatings , Ceramics

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