Download e-book for kindle: Adhesion Measurement of Films and Coatings, Volume 2 by Kash L. Mittal

By Kash L. Mittal

ISBN-10: 1601192509

ISBN-13: 9781601192509

ISBN-10: 9067643378

ISBN-13: 9789067643375

This publication records the lawsuits of the second one overseas Symposium on Adhesion dimension of flicks and Coatings, held in Newark, NJ, October 25-27, 1999. This quantity comprises 20 papers, that have all been conscientiously peer reviewed and definitely transformed sooner than inclusion. the themes contain: size and research of interface adhesion; relative adhesion dimension for skinny movie buildings; adhesion checking out of not easy coatings by way of numerous concepts; size of interfacial fracture strength in multifilm purposes; laser brought on decohesion spectroscopy (LIDS) for measuring adhesion; pulsed laser method for review of adhesion; blade adhesion try out; JKR adhesion attempt; coefficient of thermal growth size; and residual stresses in diamond motion pictures.

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Additional resources for Adhesion Measurement of Films and Coatings, Volume 2

Example text

A), B), and C) are of the same general area of the epoxy side of the failure. The SEM sample tilt angle was 30". can be detected. It is quite possible that at the onset of crack propagation a multitude of failure loci can be experienced simultaneously (recall that the onset of crack propagation is judged visually). If such varied paths are present as shown in Figure 21A, it is impossible to determine what the onset of crack propagation actually measures. Figure 22 shows a schematic of the failure paths in the MELT samples studied, most of which are shown in Figures 19-21.

Acoustic emission is used as a method in scratch testing to evaluate adhesion [54], and can be audibly detected during the peel of certain interfaces. P. Buchwalter Figure 5. Schematic of peel test sample preparation [ 13. An estimation of the energy dissipated in the deformation ahead of the crack tip and in the macroscopic deformation of the peeled film is difficult requiring careful fracture mechanics analysis [29, 441. These energy dissipating processes, though often discussed in connection with the peel test, are not necessarily specific to peel test alone.

Conventional techniques such as the pull-off method or the peel test fail due to the high loading capacity of hard coated materials. In detail, the following reasons limit the application of the mentioned methods for adhesion testing of thin hard coatings: - The interface strength of the hard coating is much higher than the strength of the adhesive bond needed to attach the sample to the test jig. - The high hardness and stiffness of the film affect the test device. - The brittle failure behavior of the film material prevents a reproducible and quantifiable detachment of the films.

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Adhesion Measurement of Films and Coatings, Volume 2 by Kash L. Mittal


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