Abstract
The so-called “direct pull method” is applied to the measurement of adhesion of vacuum-deposited thin film coatings on glass substrates. The results obtained by this method are influenced by errors in alignment of the experimental set-up and by non-uniformities of the cement films used to pull the coatings off the substrate. These effects are analysed. Results are presented for films of zinc sulphide, cryolite and silver deposited on BK7 glass substrates. The forces of adhesion on ion-bombarded substrates in these cases are found to be 430 kp/cm 2, 540 kp/cm 2 and 230 kp/cm 2 respectively.
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