Structure and tribological properties of MоN vacuum-arc coatings

Keywords

MoN coating, vacuum arc deposition, bias voltage, structure, wear resistance, test temperature, counterbody material.

Cite as

Klimenko I. O., Belous V. A., Podhurska V. Ya., Shved M. M., Tolmachova G. M., Kolodiy I. V., Ovcharenko V. D., Ishchenko M. G., Babayev I. M., and Kuprin O. S. Structure and tribological properties of MоN vacuum-arc coatings. Physicochemical Mechanics of Materials. 2024. 60(6), 118-125.

https://doi.org/10.15407/pcmm2024.06.118

Abstract

The influence of the deposition mode and test conditions on the structure and tribological properties of vacuum-arc MoN coatings was investigated. It was found that at bias voltages in the range of –30…–70 V, coatings with a thickness of 10 μm based on hexagonal molybdenum nitride δ-MoN with high nanohardness (up to 34.7 GPa) and elastic modulus (up to 471 GPa) are formed on a substrate made of 15Kh12VNMF steel. Tests of “coated plate–ball” tribopairs using ceramic (Al₂O₃) and steel (ShKh15) balls Ø 10 mm without and with CrN, TiN and MoN coatings with a thickness of 10 μm show that the coating deposited at a bias voltage of –70 V has the best properties, and by the tribological characteristics at 20°С the “plate with MoN coating–ball with TiN coating” pair is optimal. At 500°С the wear resistance of the MoN coating decreases rapidly, which is associated with its thermal instability and transformation under the influence of contact stresses into molybdenum oxide.

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