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

Öz

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.

Anahtar Kelimeler

• 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

Öz

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.

Anahtar Kelimeler

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

Kaynakça

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