Abstract
Polyamide (PA6/6) is often used as a tribological pair in abrasion prevalent applications such as hinges and sliders. PA6/6 is frequently processed by injection moulding and extrusion process. It is known that these processes influence the polymers mechanical behaviour, but their influence on the polymers wear response has not been studied. Hence the present research attempts to study the influence of different manufacturing processes on tribological behaviour for PA6/6. Wear tests were performed on a pin abrading tester (DIN 50322). Abrasion resistance of both extruded and injection moulded PA6/6 were tested at different loads (20 and 35 N). Single-pass (nonoverlapping mode) and multipass testing (overlapping mode) were used to understand the influence of clogging of wear debris. It is evidenced that with increasing load the specific wear rate decreases; moreover, fine abrasives tend to reduce the wear rate. In multipass testing a transfer layer clogged on the counterface that acted as a protective agent and lowers wear rate. Poor mechanical strength of injection moulded polymers is apparently compensated by microstructural response for having a similar wear behaviour between extruded and injection moulded PA 6/6. Hence a proper balance between microstructural and mechanical characteristics is an absolute must in PA 6/6 for better wear performance.
Highlights
Polyamides (PAs) which were introduced in the late ‘30s were extensively used as engineering plastics in structural application
The present research attempts to study the influence of different manufacturing processes on tribological behaviour for PA6/6
Wear properties of PA6/6 manufactured by extrusion and injection moulding, respectively, were investigated
Summary
Polyamides (PAs) which were introduced in the late ‘30s were extensively used as engineering plastics in structural application. An increased interest in using PAs in tribological application is due to its high mechanical strength and structural integrity. The tribological use of PA for textile machinery, automotive application, and material handling systems was reported earlier [2]. It is frequently used for components such as hinges, linear sliders, and ball joints, which experience abrasive wear. These parts are often made by either injection moulding or extrusion. A manufacturing process is often only selected based on the complexity of the wear part and availability of production facilities and with limited tribological considerations
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