Abstract
In this research, the adhesion of multilayered nitride coatings produced by cathodic arc physical vapour deposition to hot work tool steel (AISI H13) substrate was evaluated and the effect of heat treatment on mechanical properties of these coatings was studied. Plasma nitriding was carried out as part of a duplex process, prior to physical vapour deposition of TiN-TiAlN or TiN-TiAlN-CrAlN, to improve adhesion of nitride coatings of thicknesses 5 μm and 7 μm, respectively, to the hardened steel substrate. The adhesion strength of the coatings was evaluated by scratch and indentation tests. Experimental results indicated that TiN-TiAlN coatings after annealing treatment possessed the optimum properties, as compared to other coatings. Rockwell indentation tests revealed severe delamination in TiN-TiAlN-CrAlN, whereas TiN-TiAlN coatings experienced microcracks at higher critical loads.
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