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Coating Stripping Method for Refurbishing of Gas Turbine Blades and Vanes FREE

[+] Author Affiliations
Sergio Corcoruto, Umberto Guerreschi

Ansaldo, Genoa, Italy

Ettore Gandini

Atla, Turin, Italy

Paper No. 99-GT-426, pp. V004T01A009; 11 pages
doi:10.1115/99-GT-426
From:
  • ASME 1999 International Gas Turbine and Aeroengine Congress and Exhibition
  • Volume 4: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; IGTI Scholar Award; General
  • Indianapolis, Indiana, USA, June 7–10, 1999
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7861-3
  • Copyright © 1999 by ASME

abstract

Hot gas path components (blades, vanes, heat shields...) in modern gas turbines are protected against hot corrosion and oxidation by MCrAlY overlay coatings deposited throughout Vacuum Plasma Spray (VPS) process. These coatings are designed to be consumed during the operation of the engine. To extend the life of the parts the exhausted coatings must be removed without damage to the base material, so already used parts could be reapplied with new coatings and returned to service.

A stripping method has been developed in alternative to the acid stripping. The originality of the method is in using a spraying process to deposit onto the MCrAlY coating a layer of aluminium, followed by a diffusion heat treatment in vacuum. The resulting brittle aluminide layer is easily removed by mechanical means, like grit blasting.

The aluminium spraying process has been developed for turbine blades and vanes with a plasma gun positioned on a six axis robot, while uncoated areas are stopped off from aluminising. The penetration of aluminium is controlled by proper heat treatment parameters to guarantee uniformity and repeatability. The capability of recoating stripped parts as new ones has been verified.

Copyright © 1999 by ASME
This article is only available in the PDF format.

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