This work investigates the reliability and reproducibility of scratch testing for YSZ and TiO2 coatings deposited on NiCr bondcoats by plasma spraying. Scratch tests were conducted on cross-sections of the spray coatings. An image of the scratched area was taken after testing using an optical microscope in order to determine failure mode. With a statistical evaluation, the adhesion and cohesion strength were determined. The results show that cross-sectional scratch testing is effective for estimating the adhesion and cohesion strength of plasma spray coatings.

adhesion strength, ceramic coatings, cohesion strength, cross-sectional scratch testing, plasma spraying, test method evaluation
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Copyright © 2013 ASM International. All rights reserved.
2013
ASM International
Topics
Thermal barrier coatings Ceramic coating Plasma spray coating Bonding strength Test method evaluation Scratch hardness testing
Issue Section:
Surface Engineering
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