Abstract
Physical vapour deposited multilayered (Ti,Al)N/TiN coatings of different sublayer thicknesses were investigated and compared with monolayered (Ti,Al)N and TiN coatings. Mechanical characterisation was done using a depth sensing nanoindenter. Hardness and elastic modulus of multilayered coatings are higher than those of monolayer (Ti,Al)N coatings and sometimes comparable to TiN coatings. The mechanical properties of multilayered coatings depend upon the ratio of the thickness of (Ti,Al)N and TiN sublayers. Friction and wear were investigated in unlubricated fretting tests performed in air of different relative humidity. Multilayered (Ti,Al)N/TiN coatings show an improved fretting wear resistance compared to monolayer (Ti,Al)N coatings and at some fretting conditions the wear is comparable to TiN coatings or even better. A linear relationship between wear volume and dissipated energy was noticed for (Ti,Al)N and multilayered (Ti,Al)N/TiN coatings, but a large dependency upon the relative humidity was observed in contrast to TiN coatings. An explanation is put forward based on an evolving tribochemical interaction between the debris formation and the surrounding atmosphere.
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