The purpose of the paper was to assess the morphology, chemical composition, geometric surface structure and contact angle, as well as to analyse the tribological properties of Al_2O_3 coatings deposited on 100Cr6 steel using the technique of atomic layers ALD. Al_2O_3 coatings were selected due to their tribological properties, adhesion to the substrate and hardness. Tribological tests were performed in a reciprocating motion in a ball-on-disc combination, with a counter-specimen of 100Cr6 steel, under the conditions of technically dry friction. Surface morphology was observed under a scanning microscope, and an EDS analyser enabled the performance of an analysis of the chemical composition of the samples. Wetting of the surface of the Al_2O_3 coating was determined by means of an optical strain gauge. The geometric surface structure before and after the tribological tests was analysed by means of a confocal microscope with an interferometric mode. The tests proved that during technically dry friction, the average coefficient of friction for the Al_2O_3 coating is lower by approximately 30 than for 100Cr6 steel. The tested coatings are characterised by hydrophobicity. Slowa kluczowe: Al_2O_3 powloki ceramiczne, ALD, tribologia.
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