Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2011 - zeszyt 4

Characterisation of TiB2 nanocrystalline coating on the Cr-Ni-Mo austenitic steel

nr katalogowy: 64683

Metal borides are very promising components of hard coatings applied on engineering materials [1]. Titanium diboride (TiB2) of a hexagonal structure has many interesting properties, such as high melting point, high hardness, high wear and corrosion resistance, excellent chemical stability at elevated temperature as well as good thermal and electrical conductivity [2, 3]. Therefore, this material is suitable as a protective coating for many applications, e.g. cutting surfaces in machining industry. The TiB2 protective coatings can be deposited on a various substrates using several conventional PVD techniques. However, the most commonly used method is magnetron sputtering [2]. Although the coatings of this type were investigated since longer time, only few successful commercial applications exist until now. The main problem concerns a low adhesion of the TiB2 coatings on various tool materials, e.g. high-speed steel or cemented carbides, resulting from high residual stresses in such coatings [4]. However, the residual stresses can be decreased when specific deposition parameters are applied. Berger et al. [5] developed a method to grow the TiB2 coatings with low compressive residual stresses by applying positive substrate bias. This process improved also the cohesive strength while retaining high coating hardness. In the present work, nanocrystalline TiB2 coating was deposited by magnetron sputtering on a model Cr-Ni-Mo austenitic steel. The main objective was the characterization of the coating micro/nanostructure and functional properties (residual stresses, wear resistance, hardness and Young’s modulus, coating topography) as well as adhesion of the coating to the steel substrate. EXPERIMENTAL The TiB2 coating was deposited on a model Cr-Ni-Mo austenitic steel using an unbalanced dirrect current magnetron sputtering from a stoichiometric TiB2 target (99.5%, 100 mm in diameter) in Ar glow discharge. The substrate was ul[...]

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2011-4

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