Hard coatings with low friction coefficient, high corrosion resistance and low wear rates have been developed in recent years to increase the lifetime of machine-components. Common applications include Micro Electro-Mechanical Systems (MEMS) and magnetic storage devices, drawing dies and punches used in metal cutting and forming. As currently available tool coatings are very hard, wear due to abrasion or erosion is limited. Instead, most light and ductile metals have a strong tendency to adhere to counterfaces in sliding contacts . As a consequence, in addition to high hardness and toughness, an optimized coating for metal cutting should also possess high chemical stability and high thermal conductivity.
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