Abstract
Scratch testing is presented as evidence of the mechanical strength (adhesion and cohesion) of various spray coatings (detonation gun and plasma spraying) on cylindrical substrates from industrial suppliers. Applied to medium thick (approx. 20 μm) and thick (100 μm or more), rough and porous brittle coatings, scratch testing is presented as part of a general procedure including single and multi-pass operation at constant loads. The observed damage is essentially cohesive and acoustic emission becomes an indicator of chipping rather than spalling damage. Coating perforation can be reliably and reproducibly identified by means of on-line friction force monitoring which may also yield information about ploughing and prow formation in multi-pass operation. The critical load for the onset of through-thickness cracking is found to be inadequate for reliable quality ranking.
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