Quantitative Topographical Characterization of Thermally Sprayed Coatings by Optical Microscopy |
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Authors: | P Schwaller R Züst J Michler |
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Affiliation: | (1) Laboratory for Mechanics of Materials and Nanostructures, Empa, Materials Science and Technology, Feuerwerkerstrasse 39, CH 3602 Thun, Switzerland;(2) Leica Microsystems, Max Schmidheiny-Strasse 201, CH-9435 Heerbrugg, Switzerland |
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Abstract: | Topography measurements and roughness calculations for different rough surfaces (Rugotest surface comparator and thermally
sprayed coatings) are presented. The surfaces are measured with a novel quantitative topography measurement technique based
on optical stereomicroscopy and a comparison is made with established scanning stylus and optical profilometers. The results
show that for most cases the different methods yield similar results. Stereomicroscopy is therefore a valuable method for
topographical investigations in both quality control and research. On the other hand, the method based on optical microscopy
demands a careful optimization of the experimental settings like the magnification and the illumination to achieve satisfactory
results. |
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Keywords: | coatings for gas turbine components properties of coatings roughness effects |
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