Nanoindentation,AFM and tribological properties of thin nc-WC/a-C Coatings |
| |
| Authors: | Franti?ek Lofaj Milan Ferdinandy Gregorz Cempura Ján Dusza |
| |
| Affiliation: | 1. Department of Physical Metallurgy and Materials Testing, Montanuniversität Leoben, A-8700 Leoben, Austria;2. Institute of Materials Science and Technology, Vienna University of Technology, A-1040 Vienna, Austria;1. Micro Materials Ltd, Willow House, Yale Business Village, Ellice Way, Wrexham LL13 7YL, UK;2. School of Aerospace, Transport and Manufacturing, Cranfield University, Bedford MK43 0AL, UK;3. Institute of Manufacturing Engineering, Huaqiao University, Xiamen 361021, China;1. Jo?ef Stefan Institute, Department of Thin Films and Surfaces, Jamova 39, 1000 Ljubljana, Slovenia;2. Jo?ef Stefan International Postgraduate School, Jamova 39, 1000 Ljubljana, Slovenia;1. Institute of Materials Science and Technology, TU Wien, A-1060 Vienna, Austria;2. Mitsubishi Materials Corporation, 1-3-2, Otemachi, Chiyoda-ku, Tokyo, Japan;3. Plansee Composite Materials GmbH, D-86983 Lechbruck am See, Germany |
| |
| Abstract: | Instrumented indentation, AFM (atomic force microscopy) and tribological studies were performed on PE CVD (Plasma Enhanced Chemical Vapor Deposition) nanocomposite WC–C coatings to investigate the effects of surface roughness on the reliability of nanoindentation data and the possibilities of different AFM modes in nanomechanical testing, which can be used as a feedback to optimize deposition technology from the viewpoint of their mechanical properties. It was confirmed that surface roughness below 30 nm is necessary to keep the scatter of indentation modulus, EIT, and hardness, HIT, below 15%. PF QNM (Peak Force Quantitative NanoMechanical) mode was successfully applied for qualitative mapping of the elastic modulus of coatings with the stiffness above 300 GPa. LFM (lateral force microscopy) mode showed only weak contrast and quantitative measurements in both AFM modes require precise calibration. Coefficients of friction of the studied WC–C coatings were below 0.2 at RT, but increased to 0.7–0.8 at 450 °C due to the formation of a transfer film. Optimization of the deposition conditions based on nanoindentation resulted in the increase of EIT from ～220 GPa to 350 GPa and HIT from ～17 GPa to ～29 GPa. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
