Scratch and fragmentation tests were performed on 100 nm thick SiOx, coatings (1.1 x 2) deposited on PET substrates with and without prior N2-plasma treatment. A correlation was found between the critical normal forces measured during scratching and crack densities at fragmentation saturation. Quantification of the works of adhesion, and a comparison of their values for the scratch and fragmentation tests were possible by a comparison of the model developed by Bull, Burnett and Rickerby for the former, and Kelly and Tyson's model combined with the approach from Nardin and Schultz for the latter.
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Pitton et al. (1996) studied this question.
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