Investigation of Tribological Properties of Graphite Filled Cyclo-Olefin Copolymer (COC) Composites

Abstract

In this study, 5%, 15%, 30%, 45%, 60%, and 75% graphite filled cyclo-olefin copolymer (COC) polymers have been produced by extrusion and pressure molding technics. Wear and friction tests have been carried out at the sliding speeds of 0.5 m/s, 1.0 m/s and 1.5 m/s, applied loads of 20 N, 30 N, 40 N and under dry conditions using pin-on-disc system. As a result of the experiments, coefficient of friction increases while wear rate decreases with increase both applied load and sliding speed. The lowest coefficient of friction and the wear ratio have been obtained in weight of 75% graphite filled COC composites. The coefficient of friction and wear rate of the 75% graphite filled COC polymer decreased by 87.7% and 498.79%, respectively.

Keywords

• Wear
• Graphite
• Cyclo-Olefin Copolymer (COC)
• Friction

GRAFİT KATKILI SİKLO-OLEFİN KOPOLİMER (COC) KOMPOZİTLERİN TRİBOLOJİK ÖZELLİKLERİNİN İNCELENMESİ

Abstract

Bu çalışmada, ağırlıkça %5, %15, %30, %45, %60 ve %75 oranlarında grafit katkılı siklo-olefin kopolimer (COC) kompozitleri ekstrüzyon ve basınçlı kalıplama yöntemleri ile üretilmiştir. Sürtünme ve aşınma deneyleri, disk üzerinde pim sistemi (pim-disk) ile kuru ortam şartlarında, 20 N, 30 N ve 40 N yük ve 0.5 m/s, 1.0 m/s ve 1.5 m/s kayma hızında gerçekleştirilmiştir. COC polimeri ve grafit katkılı COC kompozitlerin artan kayma hızı ve yüke bağlı olarak sürtünme katsayısı azalmış aşınma oranı ise artmıştır. En düşük sürtünme katsayısı ve aşınma oranı %75 grafit katkılı COC kompozitinde elde edilmiştir. COC polimerine eklenen %75 oranındaki grafit katkısı ile sürtünme katsayısı %87.7 oranında, aşınma oranı ise %498.79 oranında azalmıştır.

Keywords

• Aşınma
• Grafit
• Siklo-Olefin Kopolimer (COC)
• Sürtünme

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