Abstract
Various adhesion measurement methods for hard coatings have been studied. However, not one has yet been established for use with a superhard coating such as diamond. This study proposes an adhesion tester which can determine quantitatively the adhesion strength of diamond films coated, e.g. on WCCo alloy substrates using the thermal CVD method. The tester comprises a scraping blade of tungsten carbide which is moved along the interface between the coating and the substrate; the scraping force is measured so as to provide the adhesion strength. Finally, the quantitative adhesion strength values thus determined were compared with the adhesion strength qualitatively determined with the shearing test in which the diamond-coated tool tip was mounted in the shearing die set. The results show that the adhesion strength values obtained either qualitatively or quantitatively relate well with each other, thus providing the usefulness of the present adhesion testing method for diamond films.
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