Effect of recycled carbon fiber reinforcement on the wear behavior of epoxy composite
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In the recent years, carbon fiber reinforced polymer (CFRP) composites have formed a very important class of tribo-engineering materials in nonlubricated condition. The usage of CFRPs has been growing at a substantial rate that leads to the increasing amount of waste generated from end-of-life components and manufacturing scrap. In the present paper, the role of as-received (rCF-AR) and cryogenic treated (rCF-T) recycled carbon fiber (rCF) reinforcements were investigated on the tribological behavior of epoxy composites by using a micro pin-on-disc tribotester apparatus under dry sliding condition. The wear behavior of the composites was analyzed based on three different sliding velocities and loads at a constant sliding distance. The results showed that the reinforcement effect of rCF-T as compared to rCF-AR has enhanced the wear resistance of epoxy composite, which is attributed to the improved adhesion between the treated rCFs and epoxy matrix.
I. INTRODUCTION
In the recent years, reinforcement of carbon fibers for thermoset polymer materials has formed a very important class of tribo-engineering materials in nonlubricated condition. This is due to the low density of the composite as well as good mechanical and tribological properties that are comparable to or even better than that of many conventional materials. Usually, carbon fiber improved mechanical and tribological properties of epoxy composites.1 Carbon fibers are one of the most favored candidates as reinforcements in tribological purposes due to their ability to carry the main load between the contacting surfaces, as well as the ability to reduce their adhesion to the counterpart and the frictional heat in the contact area during sliding process.2 Furthermore, the short carbon fiber (SCF) is reportedly effective in reducing plowing and tearing of wear.3 Despite these beneficial effects to the tribological behavior of polymer composites, the high-initial cost of carbon fibers is challenging.4 Carbon fiber is a valuable commodity, owing to its specific strength, specific modulus, and thermo-physical properties, it would be more imperative to reuse the recycled carbon fiber (rCF) from the growing amount of nondegradability of carbon fiber reinforced polymer (CFRP) composite waste material. Moreover, the final disposal of the CFRP waste is reported as follows:
Contributing Editor: Mohd Fadzli Bin Abdollah a) Address all correspondence to this author. e-mail: [email protected] DOI: 10.1557/jmr.2016.50
storage, coprocessing, incineration, and landfill.5 However, the thermoset CFRP wastes that are sent to landfill are not biodegradable, and thus could pose health and safety risks.6 Thus, it is favorable to reuse rCFs that are mechanically ground into powdered fillers from CFRP composite waste. The process of grinding up the end-oflife CFRP composite waste material and sending it to landfill and/or for incinerating has been commonly practiced as it has little appeal to industries due to its degraded properties and the existence of epoxy thermosets on the surface of the rCFs.
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