Spark plasma sintered multiwalled carbon nanotube/silicon carbide composites: densification, microstructure, and tribo-mechanical characterization
IR@CGCRI: CSIR-Central Glass and Ceramic Research Institute, Kolkata
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| Title |
Spark plasma sintered multiwalled carbon nanotube/silicon carbide composites: densification, microstructure, and tribo-mechanical characterization
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| Creator |
Sarkar, Kaushik
Sarkar, Soumya Das, Probal Kumar |
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| Subject |
Engineering Materials
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| Description |
Multiwalled carbon nanotube (MWCNT)/silicon carbide (SiC) composites were fabricated by spark plasma sintering at 2000 A degrees C under 50 MPa for 10 min in Argon. Physical properties and Williamson-Hall analyses of X-ray diffraction patterns indicated strong influence of CNT on densification, crystallite size, and lattice micro-strain of pure SiC. Structural retention of CNTs, CNT/SiC interactions, and formation of 3-4 nm thick interface in sintered composites were confirmed through electron microscopy. Meyer's exponent (1.84-1.89) of hardness data indicated almost similar indentation size effect in the studied specimens. Modified proportional specimen resistance model revealed formation of compressive surface residual stress and enhanced elastic response in CNT/SiC composites compared to pure SiC. R-curve sensitivity of present composites (toughening exponent, n ranged from 0.231 to 0.247) was found to be much improved than that obtained for pure SiC (n = 0.155). The 0.3 wt% MWCNT/SiC composite offered the highest toughness (3.93-5.56 MPa-m(0.5)) within the investigated loading range which was 17-31 % higher than those of monolithic SiC. Present composites also offered much better wear resistance up to 20 N. Wear rate of 0.1 wt% CNT/SiC composite was found to be more than 47 % lower than that obtained for pure SiC. At the highest CNT loading i.e., 1.2 wt%, composite also showed 10-12 % reduction in friction coefficient (mu) over monolithic SiC (mu = 0.53-0.58) due to the self-lubrication ability of CNT.
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| Publisher |
Springer
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| Date |
2016-07
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://cgcri.csircentral.net/3712/1/probal.pdf
Sarkar, Kaushik and Sarkar, Soumya and Das, Probal Kumar (2016) Spark plasma sintered multiwalled carbon nanotube/silicon carbide composites: densification, microstructure, and tribo-mechanical characterization. Journal of Materials Science, 51 (14). pp. 6697-6710. ISSN 0022-2461 |
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| Relation |
http://cgcri.csircentral.net/3712/
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