Abstract

Damage accumulation and fracture of magnetron sputtered Ti-Al-N coatings during wear tests in conditions of dry friction were studied. Fourier, wavelet and fractal analysis of micrographs of coating friction surfaces obtained using optical microscopy and scanning electron microscopy (SEM) were performed to characterize quantitatively their failure. Analysis of the optical micrographs with all the image processing techniques was found to allow estimating of damage accumulation in the running-in regime, but failed to characterize it in the steady-state wear regime. In contrast, wavelet analysis of SEM micrographs of the wear tracks was shown to be very promising in distinguishing different wear stages and revealing coating pre-fracture.

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