Abstract
The synthesis of TiN by physical vapour deposition at temperatures below 500°C allows high speed steel to be coated after the final machining operation. The Vickers hardness and the density of the hard coatings are nearly the same as those in bulk form. The surface roughness of the coating is, to a large extent, identical with that of the uncoated substrate. Excellent adhesion of the deposited coating is achieved. An important field of application is cutting tools, e.g. twist drills. The coated drills show a marked improvement in service life and yield a drilled hole with a higher surface quality. Remarkable improvements in service life have also resulted from the use of TiN-coated forming tools such as deep-drawing tools. The gold-coloured TiN coating can be produced in approximately the same colour nuances as the standardized gold alloys of the watch industry. Consequently, it can be used for watch cases and wrist bracelets where its abrasion resistance is far better than that of the highest industrial standard 20 μm gold plaqué.
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