Non-destructive testing method of determining the depletion...

Metal treatment – Process of modifying or maintaining internal physical... – With measuring – testing – or sensing

Reexamination Certificate

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C148S508000

Reexamination Certificate

active

10726542

ABSTRACT:
It is disclosed a method of measuring the thickness and/or the depletion of Al and Cr of a γ/γ′ MCrAlY-coating after the use in a high temperature environment, the γ/γ MCrAlY-coating exhibiting a non-equilibrium γ/γ′-microstructure at a temperature lower than the temperature during operation. Before the coating conductivity by means of a multifrequency eddy current system is measured a heat treatment is applied to transform the non-equilibrium γ/γ′-microstructure to a equilibrium microstructure having a α-Cr phase. Subsequently the Al and/or Cr depletion of the coating from the coating conductivity and permeability is determined.

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“Non-Destructive Condition Assessment of Serviced MCrAIY Coatings”, Giampiero Antonelli, CESI, Milan, Italy, Apr. 2002, pp. 1-12.
“Qualification of a Frequency Scanning Eddy Current Equipment for Nondestructive Characterization of new and Serviced High-Temperature Coatings”, Antonelli, et al., Proceedings of ASME TURBO EXPO 2001, Jun. 4-7, 2001, New Orleans, Louisiana, USA, pp. 1-8.

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