Comparison of Wear and Friction Performance of Graphite filled PTFE and PTFE Filled Polyamide Polymers for Bearing Applications

Abstract

This study was carried out to compare the tribological performances of 35wt.% graphite-added polytetrafluoroethylene (35G/PTFE) composite and 10wt.%PTFE filled polyamide 6 (10PTFE/PA6) polymer blend at different speeds used in rolling bearing applications. Tribological tests were carried out on a pin-on-disc wear test rig at the sliding speeds of 1.0, 1.5 and 2.0m / and under the loads of 50N and 150N. Tests were conducted against AISI 316L stainless steel disc material under dry sliding conditions at room temperature. As a result of the wear and friction tests, it was observed that the coefficient of friction values of both materials used in the experiments was slightly affected by the increase in sliding speed, while the wear volume and wear rate values increased. As a result of the obtained data, the wear rate of 35wt.% graphite filled PTFE composite is between 2.70 and 3.67x10-14 m2/N, while the wear rate of 10wt.% PTFE filled PA6 polymer blend is 5.07 to15.5x10-14 m2/N. 35% graphite filled PTFE composite was found to be average 62% wear resistant than that of 10wt.%PTFE filled PA6 polymer mixture.

Keywords

• Polymer
• Tribology
• Polyamide
• PTFE
• Graphite

Rulmanlı Yatak Uygulamaları İçin Grafit Katkılı PTFE ve PTFE Katkılı Poliamit-6 Polimerlerinin Aşınma ve Sürtünme Performanslarının Karşılaştırılması

Abstract

Bu çalışma, rulmanlı yatak uygulamalarında kullanılan ağırlıkça %35 grafit katkılı politetrafloretilen (35G/PTFE) kompozit ve ağırlıkça %10 PTFE katkılı poliamit 6 (10PTFE/PA6) polimer karışımının farklı hızlar altındaki tribolojik performanslarının karşılaştırılması amacıyla gerçekleştirilmiştir. Tribolojik deneyler, 1.0, 1.5 ve 2.0m/s kayma hızlarında, 50N ve 150N yükler altında disk üzerinde pim olan bir aşınma test düzeneğinde gerçekleştirilmiştir. Deneyler, AISI 316L paslanmaz çelik disk malzemeye karşı kuru kayma şartları altında, oda sıcaklığında yapılmıştır. Aşınma ve sürtünme deneyleri sonucunda, kayma hızının artması ile deneylerde kullanılan her iki malzemenin sürtünme katsayısının çok az etkilendiği gözlenirken aşınma hacmi ve aşınma oranı değerlerinin arttığı gözlenmiştir. Elde edilen veriler sonucunda, %35 grafit katkılı PTFE kompozitin aşınma oranı 2.70 ile 3.67x10-14 m2/N aralığında elde edilirken %10 PTFE katkılı PA6 polimer karışımının aşınma oranını ise 5.07 ile 15.5x10-14 m2/N aralığında elde edilmiştir. %35 grafit katkılı PTFE kompozitinin aşınma oranı %10PTFE katkılı PA6 polimer karışımına göre ortalama %62 oranında daha az aşındığı tespit edilmiştir.

Keywords

• Polimer
• Triboloji
• Poliamit
• PTFE
• Grafit

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