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Multilayer wear resistant hard coating of high temperature working tool steel obtained by vacuum-plasma DUPLEX technology

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The advance surface engineering, especially surface chemical and structure modification, resulting in modern vacuum-plasma technology of hard and superhard, mulitcomponent, multilayer, gradient and nanocomposite coatings for tribological application. In this work DUPLEX technology, as one of many possible surface engineering methods for increasing life time of machine parts and coating tools, was used, also the influence of ion nitriding before coating on the tribological properties of the coating was investigated. In the literature we can found not enough bright investigation results, connected with influence of technological parameters, architecture and chemical composition on the tribological properties of coated tools especially for high pressure aluminium alloys casting form (Fig. 1). AIM Of THE WORK The purpose of this work was to investigate the influence of ion nitriding process before hard coating of high temperature working steel of the type X37CrMoV5-1 on they structure and tribological properties, for possibility to apply our technology also for high pressure aluminium alloys casting form or other forming tools. EXPERIMENTAL PROCEDURE The substrate specimens of high temperature working steel of the type X37CrMoV5-1 (dim 40×4 cm) after chemical and ion cleaning were coated by ARC PVD method in two different attachement in KUT and VTD Drezden (Fig. 2a÷c), using parameters showed in Table 1. For investigation of structure morphology, roughness, layer thickness, microhardness, friction and wear coefficients and adhesion following instruments were applied: -- for roughness [...]

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