Coating processes – Measuring – testing – or indicating – Thickness or uniformity of thickness determined
Patent
1998-12-23
2000-12-26
Beck, Shrive
Coating processes
Measuring, testing, or indicating
Thickness or uniformity of thickness determined
427 9, 427455, 427456, 427425, B05D 112
Patent
active
061655422
ABSTRACT:
A method of fabrication and inspection includes depositing a coating and determining at least one physical property of the coating using eddy current techniques. In a detailed embodiment an abradable coating having a metal volume fraction in the range of from 0.3 to 0.5 is applied to an inner circumference of a stator for a gas turbine engine compressor. The eddy current probe is positioned by a manipulator. A distance separating the probe and a surface of the coating is measured using a frequency above one megahertz (MHz). The thickness of the coating is measured by determining the rolloff frequency for the coating's complex impedance. The coating density is determined by its complex impedance at a characteristic frequency below four MHz. The density can be used as an indication of the performance of the coating with respect to abradability and the erosion resistance. The measurements may also be applied as a post-process quality control technique.
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Janowsky Glenn T.
Jaworowski Mark
Weston Charles H.
Beck Shrive
Strain Paul D.
United Technologies Corporation
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