1. Tribo-mechanical characterization of spark plasma sintered chopped carbon fibre reinforced silicon carbide composites.
- Author
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Agarwal, Shivam, Sarkar, Soumya, Das, Mitun, and Dixit, Amit Rai
- Subjects
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TRIBOLOGY , *SILICON carbide , *MECHANICAL properties of metals , *WEAR resistance , *FRACTURE toughness , *NANOFABRICATION - Abstract
Short carbon fibre (C f ) reinforced silicon carbide (SiC) composites with 7.5 wt% alumina (Al 2 O 3 ) as sintering additive were fabricated using spark plasma sintering (SPS). Three different C f concentrations i.e. 10, 20 and 30 wt% were used to fabricate the composites. With increasing C f content from 0 to 20 wt%, micro-hardness of the composites decreased ~28% and fracture toughness (K IC ) increased significantly. The short C f in the matrix facilitated enhanced fracture energy dissipation by the processes of crack deflection and bridging at C f /SiC interface, fibre debonding and pullout. Thus, 20 wt% C f /SiC composite showed >40% higher K IC over monolithic SiC (K IC ≈4.51 MPa m 0.5 ). Tribological tests in dry condition against Al 2 O 3 ball showed slight improvement in wear resistance but significantly reduced friction coefficient (COF, μ) with increasing C f content in the composites. The composite containing 30 wt% C f showed the lowest COF. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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