Influence of hardness ratio on scratch failure of coatings

International Journal of Surface Science and Engineering

Volumn 1, Issue 1, 2007, Pages 3-21

  Lau, K H ^a   Li, K Y ^a   Mai, Y W ^b  

^a CITY UNIVERSITY OF HONG KONG   (Hong Kong)

^b UNIVERSITY OF SYDNEY   (Australia)

Author keywords

coatings; failure map; hardness ratio; scratch test

Indexed keywords

EID: 79957662042     PISSN: 1749785X     EISSN: 17497868     Source Type: Journal    
DOI: 10.1504/IJSURFSE.2007.013618     Document Type: Article

References (27)

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26. The H/E ratio of coating plays an important part in most pin-on-disc type of tribological tests when the contact load is within the elastic limit of the substrate material as mentioned in Leyland and Matthews (2000). However, in scratching tests, the substrate is readily plastically deformed right from the beginning of the stroke and it seems the effect of H/E of the coating is only secondary compared to that of the substrate.
27. This is not the ‘intrinsic’ adhesion strength but is an ‘apparent’ value defined by the coating/substrate combination as revealed by the normal load needed for failure to occur taking into account any residual stresses in the coating.