Einfluss einer chemischen Kopplung von strahlenmodifiziertem PTFE mit PA46 auf mechanische Eigenschaften und das Reib- und Verschleißverhalten

Abstract

In dry-lubricated tribological systems, polytetrafluoroethylene (PTFE) or polyamide (PA) are often used as dry lubricants. PTFE is characterized by a low coefficient of friction and a high wear rate when sliding against steel and a high temperature resistance. In contrast to PTFE, PA has a higher coefficient of friction when sliding against steel. The radiation modification of PTFE in air generates functional groups (-COF and -COOH) and persistent perfluoroalkyl (peroxy) radicals, which, when chemically coupled with suitable polymers, lead to compounds with improved tribological properties. In this paper, the mechanical and tribological properties of PA46-PTFE-cb (chemical bonded) that were kept by reactive extrusion were characterized. For this purpose, Block-on-ring tests were performed using hardened steel discs made of 16MnCr5 as counterparts.