Tribo-mechanical characterization of spark plasma sintered chopped carbon fibre reinforced silicon carbide composites |
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| Affiliation: | 1. Department of Mechanical Engineering, Indian School of Mines, Dhanbad, 826004 India;2. Non-oxide Ceramics and Composites Division (NOCCD), CSIR-Central Glass and Ceramic Research Institute, Kolkata 700032, India;3. Bio-Ceramics and Coatings Division (BCCD), CSIR-Central Glass and Ceramic Research Institute, Kolkata, 700032 India;1. Department of Mechanical Engineering, Columbia University in the City of New York, 500 W. 120th St., Mudd 220, New York, NY 10027, USA;2. Department of Materials Engineering, Ben-Gurion University of the Negev, P.O.B. 653, Beer Sheva 8410501, Israel;1. Department of Materials Science and Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran;2. Department of Mechanical Engineering, University of Mohaghegh Ardabili, Ardabil, Iran;3. Department of Materials Science and Engineering, Faculty of engineering, Yasouj university, Yasouj, Iran;1. Department of Aeronautical Engineering, Jordan University of Science and Technology, Irbid, Jordan;2. Department of Chemical Engineering, Jordan University of Science and Technology, Irbid, Jordan |
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| Abstract: | Short carbon fibre (Cf) reinforced silicon carbide (SiC) composites with 7.5 wt% alumina (Al2O3) as sintering additive were fabricated using spark plasma sintering (SPS). Three different Cf concentrations i.e. 10, 20 and 30 wt% were used to fabricate the composites. With increasing Cf content from 0 to 20 wt%, micro-hardness of the composites decreased ~28% and fracture toughness (KIC) increased significantly. The short Cf in the matrix facilitated enhanced fracture energy dissipation by the processes of crack deflection and bridging at Cf/SiC interface, fibre debonding and pullout. Thus, 20 wt% Cf/SiC composite showed >40% higher KIC over monolithic SiC (KIC≈4.51 MPa m0.5). Tribological tests in dry condition against Al2O3 ball showed slight improvement in wear resistance but significantly reduced friction coefficient (COF, μ) with increasing Cf content in the composites. The composite containing 30 wt% Cf showed the lowest COF. |
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| Keywords: | Composites Fibres Mechanical properties Wear resistance |
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