Characterization of nanostructured and conventional cermet coatings by controlled scratch testing: correlation with abrasion and hardness tests

摘要

Controlled scratch testing, dry abrasion tests and hardness measurements were performed on WC-12Co coatingsproduced by the high velocity oxy-fuel spraying of nanostructured and conventional feedstock powders. The informationobtained employing these different evaluation techniques was used to provide insight into coating behaviourand identify the most abrasion-resistant coatings. The results indicated a correlation between scratch hardnessand the microhardness determined by Vickers indentation for the coatings. There was good agreement betweenthe scratch test and the abrasion test in identifying the best coatings for use in dry abrasion. Observation of thescratched surfaces and wear scars indicated material removal by splat debonding and fracture. The results demonstratethe usefulness of the scratch test for assessing the abrasion resistance and wear behaviour of coatings.