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|Title:||Nanostructured molybdenum nitride-based coatings: effect of nitrogen concentration on microstructure and mechanical properties|
|Citation:||Thin Solid Films, 2019; 682:82-92|
|Jian Wang, Paul Munroe, Zhifeng Zhou, Zonghan Xie|
|Abstract:||Molybdenum nitride (MoNₓ) coatings were deposited onto AISI M2 tool steel substrates (hardened to HRC 60) by magnetron sputtering. The nitrogen content was controlled by means of a closed-loop optical emission monitor. The coating microstructure was examined by X-ray photoelectron spectroscopy, X-ray diffraction, scanning electron microscopy and transmission electron microscopy. This showed that the increased nitrogen content led to a transformation from body-centered cubic α-Mo phase to γ-Mo₂N phase (NaCl-B1 type) and then to a face-centered cubic MoN phase. The mechanical and tribological properties of these coatings were evaluated by nano-indentation, wear and scratch testing. The γ-Mo₂N coating showed the highest hardness and the highest values of H (hardness)/E* (effective elastic modulus) and H³/E* ratio. During scratch and wear tests, the γ-Mo₂N coating exhibited the best resistance to deformation and the lowest wear rate.|
|Keywords:||Molybdenum nitride coatings; magnetron sputtering; optical emission monitoring; wear tests; scratch tests|
|Rights:||© 2019 Published by Elsevier B.V.|
|Appears in Collections:||Aurora harvest 4|
Mechanical Engineering publications
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