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

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

Reexamination Certificate

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C148S508000, C324S233000

Reexamination Certificate

active

07150798

ABSTRACT:
It is disclosed a method of determining the exposure temperature 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 and the depletion of chromium from the γ/γ′-MCrAlY-coating still allows the α-Cr phase to form. The coating conductivity and permeability by means of a multifrequency eddy current system is measured at different locations of the component and from the measured conductivity and permeability the exposure temperature of said different locations of the components is determined.

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“Non-Destructive Condition Assessment of Serviced MCrAIY Coatings”, Giampiero Antonelli, CESI, Milan. Italy, Dec. 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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