http://repository.iitr.ac.in/handle/123456789/12631| Title: | Carbon nanotube toughened hydroxyapatite by spark plasma sintering: Microstructural evolution and multiscale tribological properties |
| Authors: | Lahiri, Debrupa Singh V. Keshri A.K. Seal S. Agarwal A. |
| Published in: | Carbon |
| Abstract: | Carbon nanotube (CNT) reinforced hydroxyapatite (HA) composite synthesized using spark plasma sintering is investigated in this study. Quantitative microstructural analysis suggests that CNTs play a role in grain boundary pinning and are responsible for the improved densification and retention of nanostructure throughout the thickness of the sintered pellet. HA crystal forms coherent interface with the CNT, resulting in a strong interfacial bond. The uniform distribution of 4 wt.% CNTs in the HA matrix, good interfacial bonding and fine HA grain size help to improve the fracture toughness by 92% and elastic modulus by 25% as compared to the HA matrix without CNT. Toughening mechanisms have been explained in terms of interfacial shear strength and pull-out energy of CNT from the HA matrix. CNT plays a major role in improving the wear resistance of HA matrix at both macro- and nano-scale. It is concluded that graphene layer removal from the CNT surface occurs during macro-wear, but not for nano-wear. Thus, the coefficient of friction (CoF) in HA-CNT decreases in macro-wear due to lubrication available through delaminated graphene layers. © 2010 Elsevier Ltd. All rights reserved. |
| Citation: | Carbon (2010), 48(11): 3103-3120 |
| URI: | https://doi.org/10.1016/j.carbon.2010.04.047 http://repository.iitr.ac.in/handle/123456789/12631 |
| Issue Date: | 2010 |
| Publisher: | Elsevier Ltd |
| ISSN: | 86223 |
| Author Scopus IDs: | 26326345700 55204645700 35205917600 7102592430 7401480913 |
| Author Affiliations: | Lahiri, D., Plasma Forming Laboratory, Nanomechanics and Nanotribology Laboratory, Mechanical and Materials Engineering, Florida International University, 10555 West Flagler Street, EC 3464, Miami, FL 33174, United States Singh, V., AMPAC and Nanoscience Technology Center, University of Central Florida, 4000 Central FL Blvd., Orlando 32816, United States Keshri, A.K., Plasma Forming Laboratory, Nanomechanics and Nanotribology Laboratory, Mechanical and Materials Engineering, Florida International University, 10555 West Flagler Street, EC 3464, Miami, FL 33174, United States Seal, S., AMPAC and Nanoscience Technology Center, University of Central Florida, 4000 Central FL Blvd., Orlando 32816, United States Agarwal, A., Plasma Forming Laboratory, Nanomechanics and Nanotribology Laboratory, Mechanical and Materials Engineering, Florida International University, 10555 West Flagler Street, EC 3464, Miami, FL 33174, United States |
| Funding Details: | Authors acknowledge support from the research facility at Advanced Materials Engineering and Research Institute (AMERI) in Florida International University and Mr. Neal Ricks, manager, AMERI. The authors are thankful to the Center for study of Matters in Extreme Conditions (CeSMEC) and Dr. S. Saxena for extending the use of Micro Raman Spectroscopy facility. A.A. acknowledges funding from the National Science Foundation CAREER Award ( NSF-DMI-0547178 ) and Office of Naval Research-DURIP program ( N00014-06-0675 ). D.L. acknowledges support from the Dissertation Evidence Acquisition Fellowship and A.K.K from the Dissertation Year Fellowship by University Graduate School of Florida International University. |
| Corresponding Author: | Agarwal, A.; Plasma Forming Laboratory, Nanomechanics and Nanotribology Laboratory, Mechanical and Materials Engineering, Florida International University, 10555 West Flagler Street, EC 3464, Miami, FL 33174, United States; email: agarwala@fiu.edu |
| Appears in Collections: | Journal Publications [MT] |
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