Influence of fiber orientation on the tribological properties of unidirectional carbon fiber reinforced epoxy composites
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tudy investigated the tribological behaviors of carbon fiber (CF) reinforced epoxy (EP) composites immersed in 10 wt% sulfuric acid solution for different numbers of days. The tribological properties of the composites were evaluated as a function of their different fiber orientations (0°, 45°, 90°, and normal orientation). The CF/EP composites showed a favorable anticorrosion performance, as assessed by electrochemical corrosion tests, due to the tightly stacked CF. Meanwhile, the wear tests indicated that the CF orientation had a significant effect on the tribological performance. Composites with 45° CF orientation exhibited the lowest friction coefficient, whereas those with 90° CF orientation had lowest wear rate, which was 6 times lower than that of composites with normal CF orientation. Moreover, the surface microstructures of the worn surfaces were observed by scanning electron microscopy (SEM) to determine the corresponding wear mechanisms.
I. INTRODUCTION
Aluminum (Al) and its alloys have excellent properties, such as good processability, high strength, and low density and ductility, however, their applications in corrosive environments and some extreme operating conditions are still greatly restricted.1 In particular, aluminum alloys are easily deformed and undergo serious wear under harsh tribological conditions, which may severely impede the normal operation of the mechanical equipment in which they are used.2,3 Hence, it is essential to develop new composite materials that combine excellent antiwear and anticorrosion properties as alternatives for Al alloys in engineering applications, such as in architecture, aeronautics, automotive components, and the petroleum and chemical industry.4,5 Polymer matrix composites, which have shown outstanding properties of easy processing, corrosion resistance, self-lubricating, and high wear resistance,6,7 are ideal candidates for tribo-materials used in engineering fields.8 As an important thermosetting matrix of polymer materials, epoxy (EP) resin has been widely used in engineering applications because of its excellent features, such as high mechanical properties, low curing shrinkage, and excellent chemical and corrosion resistance. 9 However, the application of EP is somewhat limited by its inherent brittleness, which results in inferior wear Contributing Editor: Linda S. Schadler a) Address all correspondence to this author. e-mail: [email protected] DOI: 10.1557/jmr.2017.13
resistance.10 The integration of appropriate reinforcing materials into the EP matrix is a promising and widely accepted method of improving the wear resistance of EP to make it suitable for more demanding applications. At present, carbon fiber (CF) is widely used as a load-bearing or corrosion-resistant structure to reinforce polymer composites, owing to its high strength and modulus, low thermal expansion, good creep resistance, and anticorrosion properties. 1116 Jia et al.17 comparatively studied the wear and transfer behaviors of polymer composites reinforced with CF under dry sliding and w
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