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Proceedings Paper

Evaluation of TiN and CrN surface coatings with laser-supported thermography
Author(s): Uwe Radtke; Horst-Artur Crostack
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Paper Abstract

With the PVD (physical-vapor-deposition) technology various metallic and ceramic coatings, for example coatings like TiN and CrN, can be used on different materials as wear- resistant coatings. To verify the quality of the coating especially on components with a complex shape the nondestructive testing of the coating properties is very important. Established nondestructive testing techniques like ultrasonic and eddy current techniques often fail for thin coatings because of the large wavelength. In this article the possibilities and limits of the laser supported thermography for the characterization of such coatings are presented and discussed. Beside the thermal wave technique using a periodic laser heating and an infrared detection from the front side of the component the transient behavior of the temperature in the case of a step like heating is analyzed. By a systematic variation of the measurement parameters and comparison with calculations about the heat flow in coating systems the thermal properties near the surface of the component are analyzed. The results of the laser supported thermography are compared with the results of a metallography of the coatings.

Paper Details

Date Published: 21 August 1996
PDF: 8 pages
Proc. SPIE 2786, Vision Systems: Applications, (21 August 1996); doi: 10.1117/12.248578
Show Author Affiliations
Uwe Radtke, Univ. Dortmund (Germany)
Horst-Artur Crostack, Univ. Dortmund (Germany)

Published in SPIE Proceedings Vol. 2786:
Vision Systems: Applications
Panayotis A. Kammenos; Bertram Nickolay, Editor(s)

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