FRICTION AND WEAR PROPERTIES OF BRONZE FILLED POLY-TETRA-FLUORO-ETHYLENE (PTFE) COMPOSITES AGAINST STAINLESS STEEL

Year 2015, Issue: 034, 87 - 98, 15.06.2015

Hüseyin Ünal , Salih Hakan Yetkin , Bayram Poyraz

Abstract

In this work,
tribological performance of pure poly-tetra-fluoro-ethylene (PTFE), 25%bronze
filled PTFE composite and 40%bronze filled PTFE composite sliding against
stainless steel under dry sliding environment were studied. A pin-on-disc tribometer
is used for evaluating the friction and wear behavior of PTFE polymer and its
composites. The tribological tests were conducted at applied loads of 50N,
100N, and 150N and at sliding speeds of 1.0, 1.5 and 2.0 m/s. The results show
that the PTFE+40wt.% bronze composite is the best tribological behavior. As a
result of study, the coefficient of friction and specific wear rate of PTFE
composite were reduced by the addition of bronze filler. Finally, an optical
microscope was used to examine the wear mechanism of pure PTFE and PTFE
composites with bronze filler.

Keywords

poly-tetra-fluoro-ethylene, bronze, tribology, filler, wear, friction

BRONZ KATKILI POLİ-TETRA-FLOR-ETİLEN (PTFE) KOMPOZİTLERİN PASLANMAZ ÇELİK MALZEMEYE KARŞI AŞINMA VE SÜRTÜNME DAVRANIŞLARI

Abstract

Bu deneysel çalışmada, katkısız
poli-tetra-flor-etilen (PTFE) polimeri ile %25 bronz katkılı PTFE kompoziti ve
%40 bronz katkılı PTFE kompozitlerin, kuru kayma şartları altında paslanmaz
çelik malzemeye karşı tribolojik performansları incelenmiştir. Tribolojik
testler, pim-disk aşınma cihazında ve oda sıcaklığında gerçekleştirilmiştir.
Aşınma ve sürtünme testleri, 50N, 100N ve 150N yüklerde ve 1.0, 1.5 ve 2.0m/s
kayma hızlarında yapılmıştır. Aşınma test sonuçlarına göre, %40 bronz katkılı
PTFE kompozitinin sürtünme katsayısı değerleri ile spesifik aşınma oranı değerlerinin
katkısız PTFE ve %25 bronz katkılı PTFE’ye göre daha düşük olduğu tespit
edilmiştir. PTFE ve bronz katkılı PTFE kompozitlerinin aşınma yüzeylerini
incelemek için optik mikroskop kullanılmıştır. Bronz katkılı PTFE kompozitlerin
aşınma mekanizması adhezif ve abrazif aşınma şeklinde gerçekleşmiştir.

Keywords

Poli-tetra-flor-etilen, bronz, triboloji, katkı, aşınma, sürtünme

References

• [1] Oscar Olea-Mejia, W. Brostow, E. Buchman, “Wear Resistance and Wear Mechanisms in Polymer-Metal Composites”, Journal of Nanoscience and Nanotechnology, Vol.10, 1–6, (2010).
• [2] H. Unal, A. Mimaroglu, U. Kadıoglu, H. Ekiz, “Sliding friction and wear behaviour of polytetrafluoroethylene and its composites under dry conditions”, Materials and Design 25 239–245, (2004).
• [3] S. Bahadur, Y. Zheng, “Mechanical and tribological behaviour of polyester reinforced with short glass fibers”, Wear 137:251–66, (1990).
• [4] Sung NH, Suh HP. “Effect of fibre orientation on friction and wear of fibre reinforced polymer composites”. Wear 53: 129–41, (1979).
• [5] I. Khedkar, E.I. Negulescu, Meletis, “Sliding wear behavior of PTFE composites”, Wear, Vol. 252, No. 5-6, pp. 361-369, (2002).
• [6] M. Pasha, B.A. Abdul Budan, D. Basavarajappa, S. Manjunath Yadav, S. Nizamuddin, B.A., “Dry sliding wear behaviour of PTFE filled with glass and bronze particles”, Tribology – Materials, Surfaces & Interfaces, Vol. 5, No. 2, pp. 59-64, (2011).
• [7] R. K. Goyal, M. Yadav, “Study on wear and friction behavior of graphite flake-filled PTFE composites”, Journal of Applied Polymer Science, Vol. 127, No. 4, pp. 3186-3191, (2013).
• [8] H. Unal, E. Kurtulus, A. Mimaroglu, M. Aydin, “Tribological performance of PTFE bronze filled composites under wide range of application conditions”, Journal of Reinforced Plastics and Composites, Vol. 29, No. 14, pp. 2184-2191, (2010).
• [9] D. D. Bagale, “Wear analysis of PTFE and its composites under dry conditions using design expert”, ME dissertation, SSBT’s COET, Bambhori, Jalgaon, 12, (2011).
• [10] V.B. Raka, “Tribological behaviour of PTFE and its composites”, Innovations in Mechanical Engineering (IME’10) pp.148-155, (2010).
• [11] B. Chaudhari, Sandip, S.P. Shekhawat, “Wear Analysis of Polytetrafluoroethylene (PTFE) and it’s Composites under Wet Conditions”, IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE) Volume 8, Issue 2 (Jul. - Aug. 2013).
• [12] J. Li, Y. Ran, “Evaluation of the friction and wear properties of PTFE composites filled with glass and carbon fiber”, Mat.-wiss. u.Werkstofftech., 41, No. 2, (2010).
• [13] T. Tevrüz, “Tribological behaviours of bronze-filled polytetrafluoroethylene dry journal bearings”, Wear 230, 61–69, (1999).
• [14] M.T. Demirci, H. Düzcükoğlu, “Wear behaviours of PTFE reinforced PA66 journal bearings”. In Int. Scientific Conference. Gabrovo, pp. 249-253, (2010).
• [15] R. Franke, D. Lehmann, K. Kunze, “Tribological behavior of new chemically bonded PTFE polyamide compounds”. Wear, 262: 242-252, (2007).
• [16] Z. Rymuza, Reibungsverhalten feinmechanischer kunststoffgleit- lager, Tribologie und Schmierungstechnik, 36, 223–227, (1989).
• [17] T. Tevruz, Tribological behaviours of pure and glass fibre filled polytetrafluoroethylene, PTFE Journal Bearings, 9th Engineering Symposium, May 29–31, (1996), pp. 1–6, Süleyman Demirel Üniversitesi, Isparta,
• [18] H. Unal, S.H. Yetgin, F. Fındık, “The effect of applied load and sliding speed on the tribological properties of Nylon 6 and ultra-high-molecular-weight polyethylene”. Industrial Lubrication and Tribology, 66/3: 498-504, (2014).