Study of Abrasive Wear Volume Map for PTFE and PTFE Composites
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Study of Abrasive Wear Volume Map for PTFE and PTFE Composites H. Unal & U. Sen & A. Mimaroglu
Received: 19 June 2007 / Accepted: 3 December 2007 / Published online: 20 December 2007 # Springer Science + Business Media B.V. 2007
Abstract The potential of this work is based on consideration of wear volume map for the evaluation of abrasive wear performance of polytetrafluoroethylene (PTFE) and PTFE composites. The fillers used in the composite are 25% bronze, 35% graphite and 17% glass fibre glass (GFR). The influence of filler materials, abrasion surface roughness and applied load values on abrasive wear performance of PTFE and PTFE composites were studied and evaluated. Experimental abrasive wear tests were carried out at atmospheric condition on pinon-disc wear tribometer. Tests were performed under 4, 6, 8 and 10 N load values, travelling speed of 1 m/sec and abrasion surface roughness values of 5, 20 and 45 µm. Wear volume maps were obtained and the results showed that the lowest wear volume rate for PTFE is reached using GFR filler. Furthermore, the results also showed that the higher is the applied load and the roughness of the abrasion surface, the higher is the wear rate. Finally it is also concluded that abrasive wear process mechanism include ploughing and cutting mechanisms. Keywords Abrasive . Wear volume map . PTFE composites
1 Introduction In tribology, abrasive wear is important because it has a contribution of at least 60% to the total cost due to wear. This type of wear is caused by hard particles that are forced and moving along a solid surface which result to penetrate and removal of materials from other surface. In fact the abrasion involves the tearing away of small pieces of materials, therefore the tensile strength, fatigue life and hardness are important factors in determination the wear characteristics of materials [1]. Generally, abrasive wear as a model is classed as two body and three body abrasion system [2–6]. In fact this is the movement pattern of the dry and loose abrasive particles [7]. Viewing polymer materials from point view of tribology, PTFE is one of a major class of engineering tribo-polymers with a good combination of thermal, H. Unal Faculty of Technical Education, University of Sakarya, Esentepe Kampusu, Adapazari, Turkey U. Sen : A. Mimaroglu (*) Faculty of Engineering, University of Sakarya, Esentepe Kampusu, Adapazari, Turkey e-mail: [email protected]
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Appl Compos Mater (2007) 14:287–306
mechanical and tribological properties. To reach better performances from this polymer, reinforcement offers a unique solution [8–10]. Different reinforcement was used such as fibre glass, bronze and graphite. PTFE composites found its application in mechanical seal in petroleum industry which faces abrasive wear conditions, see Fig. 1 (www.chesterton. com, engineering polymeric solutions—full selection of design materials catalogue, AW Chesterton Co., MA, USA). In past, numerous research publications on the adhesive evaluation of fibre reinforced polymer composites are do
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