TY - JOUR
T1 - Micro-wear and friction of carbon film with molecularly thin PFPE lubricants
AU - He, Muyang
AU - Yeo, Chang Dong
N1 - Funding Information:
This research was supported by grants from the National Science Foundation under Grant number CMMI-1463078 and Seagate Technology under Agreement Number 152280. The authors gratefully acknowledge these supports.
Publisher Copyright:
© 2018, The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature.
PY - 2018/7/1
Y1 - 2018/7/1
N2 - When a surface protective diamond-like-carbon (DLC) film experiences high speed contact, it can be degraded and damaged by mechanical stress and frictional temperature rise. In this study, the thermomechanical contact behavior of thin DLC film on a magnetic recording disk was systematically investigated with respect to the contact speed (1.2 m/s ~ 36.1 m/s) using a newly-developed experiment technique. For comparison, experiments were performed on the DLC film samples with and without molecularly thin perfluoropolyether (PFPE) lubricants on the surface. Using the post experiment samples, atomic force microscopy (AFM) and micro Raman measurements were carried out to examine the mechanisms of surface wear and material degradation. It was observed that the higher contact speed (12.0 m/s & 36.1 m/s) caused earlier failure and wider wear track on the surface than the lower contact speed (i.e., 1.2 m/s). When a monolayer thick PFPE lubricant is applied onto the surface, it significantly improved the friction and wear performance of the DLC film. Based on the Raman analysis, it could be found that the DLC on the contact area showed a clear evidence of thermal degradation, i.e., graphitization process, by frictional heat generation.
AB - When a surface protective diamond-like-carbon (DLC) film experiences high speed contact, it can be degraded and damaged by mechanical stress and frictional temperature rise. In this study, the thermomechanical contact behavior of thin DLC film on a magnetic recording disk was systematically investigated with respect to the contact speed (1.2 m/s ~ 36.1 m/s) using a newly-developed experiment technique. For comparison, experiments were performed on the DLC film samples with and without molecularly thin perfluoropolyether (PFPE) lubricants on the surface. Using the post experiment samples, atomic force microscopy (AFM) and micro Raman measurements were carried out to examine the mechanisms of surface wear and material degradation. It was observed that the higher contact speed (12.0 m/s & 36.1 m/s) caused earlier failure and wider wear track on the surface than the lower contact speed (i.e., 1.2 m/s). When a monolayer thick PFPE lubricant is applied onto the surface, it significantly improved the friction and wear performance of the DLC film. Based on the Raman analysis, it could be found that the DLC on the contact area showed a clear evidence of thermal degradation, i.e., graphitization process, by frictional heat generation.
KW - DLC film
KW - Graphitization
KW - PFPE lubricant
KW - Raman spectroscopy
KW - Wear
UR - http://www.scopus.com/inward/record.url?scp=85050246049&partnerID=8YFLogxK
U2 - 10.1007/s12206-018-0631-9
DO - 10.1007/s12206-018-0631-9
M3 - Article
AN - SCOPUS:85050246049
VL - 32
SP - 3291
EP - 3297
JO - Journal of Mechanical Science and Technology
JF - Journal of Mechanical Science and Technology
SN - 1738-494X
IS - 7
ER -