Abstract
Gradient/monolithic coatings (Ti/TiCN/CrN, Ti/TiCN/TiAlN, Ti/DLC/DLC) were deposited onto magnesium alloy (Mg-Al-Zn) substrate by Cathodic Arc Evaporation method and Plasma Assisted Chemical Vapor Deposition method. A thin metallic layer (Ti) was deposited prior to deposition of gradient coatings to improve adhesion. The microstructure wear resistance and adhesion of the investigated coatings were studied. SEM micrographs showed that the deposited coatings are characterized by compact structure without delamination or defects and they closely adhere to each other. The critical load LC lies within the range of 8-17 N, depending on the coating type. The DLC coatings demonstrate the highest wear resistance. The good properties of the PVD gradient coatings make them suitable in various industrial applications.
Highlights
Magnesium alloys have excellent physical and mechanical properties for a number of applications
Due to the character of the investigated material and its relatively low melting point, the whole technological PVD and PACVD processes were performed at temperatures up to 150 °C for Ti/Ti(C,N)/CrN coatings and Ti/Ti(C,N)/ (Ti,Al)N coatings, and up to 180° C for Ti/DLC/DLC coating
Investigations carried out using transmission electron microscopy have conformed the (Ti,Al)N, CrN and graphite phases occurred in the surface layer
Summary
Magnesium alloys have excellent physical and mechanical properties for a number of applications. Progress in the field of coating production obtained by the physical vapour deposition process allows it to achieve hybrid functional coatings - gradient and multi-component, which reveals high mechanical and functional properties Coatings of this structure have a low friction coefficient (selflubricating coatings) in many working environments, while maintaining high hardness and increased resistance to external factors. To preserve the balance between the modern substrate materials and the new generation coating The aim of this innovative work was to obtain best possible hybrid coatings, consisting of – a gradient transition layer, with a continuous change of one or more components reaching from the substrate to the surface top – as well as an outer coating using the Cathodic Arc Evaporation process and Plasma Assisted Chemical Vapor Deposition process on the surface of the cast AZ61 magnesium alloys to increase properties and the low stiffness of the substrate material. This article focuses on the properties and structure analysis in order to evaluate the quality of the obtained coating
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