Paper Title:
Degradation of Protective Al - Si Coatings during Exploitation of Gas Turbine Blades
  Abstract

Diffusion Al-Si coatings are often used to protect rotor blades of aircraft engines against high-temperature corrosion in environments containing sulfur compounds. Besides other microstructural changes, the degradation of AlSi layers can be indicated by an increasing amount of surface oxide phases and changes in parameters of the layer geometry. In practice, the timetemperature area beyond a critical temperature of the outgoing gas is used as an empirical exploitation parameter D indicating a degradation level. The efficiency of such approach was investigated by analyzing degradation features in the surface layers of rotor blades after exploitations corresponding to different values of D. Determined simple relationships between the relative thickness of degraded layer and the parameter D verify the methodology and yield its clear geometrical interpretation. However, this method fails to provide reasonable information in case when the gas is burning outside the combustion chamber due to a sudden decrease of turbine revolutions.

  Info
Periodical
Materials Science Forum (Volumes 567-568)
Edited by
Pavel Šandera
Pages
309-312
DOI
10.4028/www.scientific.net/MSF.567-568.309
Citation
M. Kianicová, J. Pokluda, "Degradation of Protective Al - Si Coatings during Exploitation of Gas Turbine Blades", Materials Science Forum, Vols. 567-568, pp. 309-312, 2008
Online since
December 2007
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Price
$32.00
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