Possibilities for Online Coating ThicknessMeasurement for Thermal Spray Processes
Authors: Dipl.-Ing. Roberto Puschmann, Dipl.-Ing. Carl Christoph Stahr, Dr.-Ing. Lutz-Michael Berger
Coating thickness is a key economic factor for thermal spray coating solutions.
In this work, an optical micrometer and a laser displacement sensor were investigated
for use for online coating thickness measurement during thermal
spraying. The suitability of these two measurement methods was investigated
for APS and HVOF spraying of aluminum oxide. Measurements obtained
online were compared with values obtained from commonly used offline
methods. Both the optical micrometer and the laser displacement sensor
were found to be suitable for online coating thickness measurement. Overpowering
of the light source in APS and thermal expansion of the substrate in
HVOF represented the main disturbing factors. The advantages of the optical
micrometer are the lower scatter and higher stability of measurements. In
contrast, the laser displacement sensor features greater flexibility in operation
and can hence be used more easily for complex geometries.
Pages: 111 - 116
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