İndirgenmiş Grafen Oksit Katkılı UHMWPE Kompozitin Kuru ve Sulu Ortamlarda Aşınma Davranışlarının Karşılaştırılması

Abstract

Bu çalışmada, katkısız ultra yüksek moleküler ağırlıklı polietilen (UHMWPE) ile ağırlıkça % 0,5 indirgenmiş grafen oksit (CRGO) katkılı kompozitin (CRGO/UHMWPE) kuru ve saf su ortamlarında aşınma davranışları incelenmiştir. Morfolojik incelemeler CRGO dolgusunun polimer matriksde homojen dağıldığını ve matriks dolgu etkileşiminin sağlandığını göstermiştir. Kompozit örneğinin sürtünme katsayısı ve aşınma hızı hem kuru hem de saf su ortamlarında CRGO ilavesi ile azalmıştır. Kuru aşınma ortamında kompozit örneğinde plastik deformasyon ve yorulma aşınması baskınken, saf su ortamında adhezif aşınma izleri görülmüştür.

Ultra-high molecular weight polyethylene (UHMWPE) is the most relevant materials for hip and knee replacements due to its bio-compatibility and excellent properties. In this study, graphene with its low density and lubricating properties was used as filler and was incorporated into UHMWPE matrix to strengthen the performance of composite. Wear behaviors of pure UHMWPE and composite (CRGO/UHMWPE) filled with 0,5 wt.% reduced graphene oxide (CRGO) under dry and distilled water environments were studied. UHMWPE and CRGO were mixed with the liquid phase ultrasonic dispersion and composite sample were produced by hot press molding. FTIR analysis results showed that there was interaction between the filler and polymer matrix, XRD analysis confirmed the modification of crystalline structure of UHMWPE and SEM-EDS elemental mapping results of composite indicated that oxygen was uniformly distributed in the polymer matrix. The coefficient of friction and wear rate of composite sample decreased under both dry and distilled water conditions by the addition of CRGO filler. Because lubrication capability of both graphene and distilled water had a significantly effect on friction and wear behavior of composite sample. Plastic deformation and fatigue wear were dominant for the composite sample under dry sliding but adhesive wear tracs were observed under distilled water conditions.