Investigations on the influence of graphite filler on dry sliding wear and abrasive wear behaviour of carbon fabric reinforced epoxy composites

• Published in: Wear Vol. 267; no. 9-10; pp. 1405 - 1414
• Main Authors: Suresha, B., Siddaramaiah, Kishore, Seetharamu, S., Kumaran, P. Sampath
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 09.09.2009; Elsevier
• Subjects: Applied sciences; Carbon-epoxy composites; Composites; Dry sliding wear; Exact sciences and technology; Forms of application and semi-finished materials; Fracture mechanics (crack, fatigue, damage...); Friction, wear, lubrication; Fundamental areas of phenomenology (including applications); Graphite filler; Machine components; Mechanical engineering. Machine design; Physics; Polymer industry, paints, wood; Solid mechanics; Structural and continuum mechanics; Technology of polymers; Two-body wear; Wear mechanisms; Two-body wear; Carbon-epoxy composites; Graphite filler; Wear mechanisms; Dry sliding wear; Epoxy resin; Composite material; Dry friction; Graphite fiber; Microcracking; Wear rate; Sliding contact; Pin disk test; Sliding friction; Damaging; Carbon fiber; Scanning electron microscopy; Sliding wear; Wear test; Rupture; Steel; Experimental study; Silicon carbide; Two body system; Abrasive wear; Graphite; Abrasives; Tribology
• ISSN: 0043-1648; 1873-2577
• DOI: 10.1016/j.wear.2009.01.026

In this experimental study, the dry sliding wear and two-body abrasive wear behaviour of graphite filled carbon fabric reinforced epoxy composites were investigated. Carbon fabric reinforced epoxy composite was used as a reference material. Sliding wear experiments were conducted using a pin-on-disc wear tester under dry contact condition. Mass loss was determined as a function of sliding velocity for loads of 25, 50, 75, and 100N at a constant sliding distance of 6000m. Two-body abrasive wear experiments were performed under multi-pass condition using silicon carbide (SiC) of 150 and 320 grit abrasive papers. The effects of abrading distance and different loads have been studied. Abrasive wear volume and specific wear rate as a function of applied normal load and abrading distance were also determined. The results show that in dry sliding wear situations, for increased load and sliding velocity, higher wear loss was recorded. The excellent wear characteristics were obtained with carbon-epoxy containing graphite as filler. Especially, 10wt.% of graphite in carbon-epoxy gave a low wear rate. A graphite surface film formed on the counterface was confirmed to be effective in improving the wear characteristics of graphite filled carbon-epoxy composites. In case of two-body abrasive wear, the wear volume increases with increasing load/abrading distance. Experimental results showed the type of counterface (hardened steel disc and SiC paper) material greatly influences the wear behaviour of the composites. Wear mechanisms of the composites were investigated using scanning electron microscopy. Wear of carbon-epoxy composite was found to be mainly due to a microcracking and fiber fracture mechanisms. It was found that the microcracking mechanism had been caused by progressive surface damage. Further, it was also noticed that carbon-epoxy composite wear is reduced to a greater extent by addition of the graphite filler, in which wear was dominated by microplowing/microcutting mechanisms instead of microcracking.