Abstract
In this study, SU-8 and its composites are fabricated by blending 10 wt.% hexagonal boron nitride (h-BN) fillers with/without lubricants, such as 10 wt.% base oil (SN150) and 20 wt.% perfluoropolyether (PFPE). The thickness of SU-8 and its composites coating is fabricated in the range ∼100–105 ±m. Further, SU-8 and its composites are characterized by a 3D optical profilometer, atomic force microscopy, scanning electron microscopy, a thermal gravimetric analyzer, a goniometer, a hardness tester, and an optical microscope. Under a tribology test performed at different normal loads of 2, 4, and 6 N and at a constant sliding speed of 0.28 m/s, the reduction in the initial and steady-state coefficient of friction is obtained to be ∼0.08 and ∼0.098, respectively, in comparison to SU-8 (∼0.42 and ∼0.75), and the wear resistance is enhanced by more than 103 times that of pure SU-8. Moreover, the thermal stability is improved by ∼80–120 °C, and the hardness and elastic modulus by ∼3 and ∼2 times that of pure SU-8, respectively. The SU-8 composite reinforced with 10 wt.% h-BN and 20 wt.% PFPE demonstrated the best thermo-mechanical and tribological properties with a nano-textured surface of high hydrophobicity.
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Bertsch A, Renaud P. Special issue: 15 years of SU8 as MEMS material. Micromachines6(6): 790–792 (2015)
Steinháuser S, Wielage B. Composite coatings: Manufacture, properties, and applications. Surf Eng13(4): 289–294 (1997)
Rathaur A S, Katiyar J K, Patel V K, Bhaumik S, Sharma A K. A comparative study of tribological and mechanical properties of composite polymer coatings on bearing steel. Int J Surf Sci Eng12(5–6): 379–101 (2018).
Lau K H, Giridhar A, Harikrishnan S, Satyanarayana N, Sinha S K. Releasing high aspect ratio SU-8 microstructures using AZ photoresist as a sacrificial layer on metallized Si substrates. Microsyst Technol19(11): 1863–1871 (2013)
Maboudian R, Ashurst W R, Carraro C. Tribological challenges in micromechanical systems. Tribol Lett12(2): 95–100 (2002)
Jiguet S, Judelewicz M, Mischler S, Hofmann H, Bertsch A, Renaud P. SU-8 nanocomposite coatings with improved tribological performance for MEMS. Surf Coat Technol201(6): 2289–2295 (2006)
Jiguet S, Judelewicz M, Mischler S, Bertch A, Renaud P. Effect of filler behavior on nanocomposite SU8 photoresist for moving micro-parts. Microelectron Eng83(4–9): 1273–1276 (2006)
Jiguet S, Bertsch A, Judelewicz M, Hofmann H, Renaud P. SU-8 nanocomposite photoresist with low stress properties for microfabrication applications. Microelectron Eng83(10): 1966–1970 (2006)
Saravanan P, Satyanarayana N, Sinha S K. Self-lubricating SU-8 nanocomposites for microelectromechanical systems applications. Tribol Lett49(1): 169–178 (2013)
Saravanan P, Satyanarayana N, Sinha S K. Wear durability study on self-lubricating SU-8 composites with perfluoro-polyther, multiply-alkylated cyclopentane and base oil as the fillers. Tribol Int64: 103–115 (2013)
Saravanan P, Satyanarayana N, Siong P C, Duong H M, Sinha S K. Tribology of self-lubricating SU-8+PFPE composite based Lub-tape. Procedia Eng68: 497–504 (2013)
Katiyar J K, Sinha S K, Kumar A. Effects of carbon fillers on the tribological and mechanical properties of an epoxy-based polymer (SU-8). Tribol-Mater, Surf Interfaces10(1): 33–44 (2016)
Katiyar J K, Sinha S K, Kumar A. Effect of graphite concentration on the tribological and mechanical properties of filled SU-8 polymer. Tribol Online11(2): 152–158 (2016)
Katiyar J K, Sinha S K, Kumar A. Friction and wear durability study of epoxy-based polymer (SU-8) composite coatings with talc and graphite as fillers. Wear362–363: 199–208 (2016)
Batooli L, Maldonado S G, Judelewicz M, Mischler S. Novel SU-8/ionic liquid composite for tribological coatings and MEMS. Micromachines6(5): 611–621 (2015)
Katiyar J K, Sinha S K, Kumar A. In situ lubrication of SU-8/talc composite with base oil (SN150) and per-fluoropolyether as fillers. Tribol Lett64(1): 5 (2016)
Basu A, Majumdar J D, Manna I. Structure and properties of CrxN coating. Surf Eng28(3): 199–204 (2012)
Dearnley P A, Bell T. Engineering the surface with boron based materials. Surf Eng1(3): 203–217 (1985)
Kimura Y, Wakabayashi T, Okada K, Wada T, Nishikawa H. Boron nitride as a lubricant additive. Wear232(2): 199–206 (1999)
Pawlak Z, Kaldonski T, Pai R, Bayraktar E, Oloyede A. A comparative study on the tribological behaviour of hexagonal boron nitride (h-BN) as lubricating micro-particles—An additive in porous sliding bearings for a car clutch. Wear267(5–8): 1198–1202 (2009)
Pawlak Z, Pai R, Bayraktar E, Kaldonski T, Oloyede A. Lamellar lubrication in vivo and vitro: friction testing of hexagonal boron nitride. Biosystems94(3): 202–208 (2008)
Chen S Y, Bi Y N, Zhang H, Liang J, Wellburn D, Liu C S. Effect of BN fraction on the mechanical and tribological properties of Cu alloy/BN self-lubricating sleeves. J Compos Mater49(30): 3715–3725 (2015)
Broje V, Keller A A. Interfacial interactions between hydrocarbon liquids and solid surfaces used in mechanical oil spill recovery. J Colloid Interface Sci305(2): 286–292 (2007)
Celis J P, Stals L, Vancoille E, Mohrbacher H. Wear testing of hard coatings: more than wear rate. Surf Eng14(3): 205–210 (1998)
Johnson K L. Contact Mechanics. Cambridge (UK): Cambridge University Press, 1985
Myint S M, Minn M, Ren Y P, Satyanarayana N, Sinha S K, Bhatia C S. Friction and wear durability studies on the 3D negative fingerprint and honeycomb textured SU-8 surfaces. Tribol Int60: 187–197 (2013)
McCook N L, Burris D L, Kim N H, Sawyer W G. Cumulative damage modeling of solid lubricant coatings that experience wear and interfacial fatigue. Wear262(11–12): 1490–1495 (2007)
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Anand Singh RATHAUR. He received his M.Tech degree from Swami Vivekananda Subharti University, Meerut Uttar Pradesh. Presently, he is doing doctorate from Govind Ballabh Pant Institute of Engineering and Technology, Pauri, Garhwal, Uttarakhand. His areas of interest are polymer composite, composite coatings and tribology.
Jitendra Kumar KATIYAR. He is research assistant professor in the Department of Mechanical Engineering, SRM Institute of Science and Technology, Kattankulathur, Tamil Nadu, India. His research interests include tribology of carbon materials, polymer composites, self-lubricating polymers, lubrication tribology and coatings for advanced technologies. He obtained his Ph.D. degree from the Indian Institute of Technology Kanpur in 2017 and master degree from the same institution in 2010. He obtained his bachelor degree from UPTU Lucknow with Honors in 2007. He has several professional memberships such as Tribology Society of India, Malaysian Society of Tribology, and The Indian Society for Technical Education (ISTE). He has published more than two dozen papers in reputed journals and international conferences. He is also a reviewer in many reputed journals such as Tribology International, Friction, Material Research Express, and Inderscience Journals.
Vinay K. PATEL. He is assistant professor in the Department of Mechanical Engineering, Govind Ballabh Pant Institute of Engineering and Technology, Pauri Garhwal, Uttarakhand, India. He completed his Ph.D. degree from Indian Institute of Technology Kanpur in 2015, specializing in nano-energetic materials. His research interests include nano-energetic materials, MEMS, welding and tribology. He has published 25 peer-reviewed journal articles, 7 conference papers, 8 chapters and edited one book on nano-energetic materials.
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Rathaur, A.S., Katiyar, J.K. & Patel, V.K. Thermo-mechanical and tribological properties of SU-8/h-BN composite with SN150/perfluoropolyether filler. Friction 8, 151–163 (2020). https://doi.org/10.1007/s40544-019-0257-7
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DOI: https://doi.org/10.1007/s40544-019-0257-7