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TiAlN/CrN superlattice coatings show excellent surface oxidation resistance up to 900°C, with an as deposited hardness maximum of HK 3400 (bi-layer 3.8nm). Coated M2 high speed steel and cemented carbide samples have been examined by scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDX) after heat treatment in air between 600°C and 1000°C to study the influence of the oxidation...