Synthesis of zirconia nanoparticles on carbon nanotubes and their potential for enhancing the fracture toughness of alumina ceramics

Zhu, Yue-Feng and Shi, Lei and Liang, Ji and Hui, David and Lau, Kin-Tak (2008) Synthesis of zirconia nanoparticles on carbon nanotubes and their potential for enhancing the fracture toughness of alumina ceramics. Composites Part B: Engineering, 39 (7-8). pp. 1136-1141. ISSN 1359-8368

Abstract

Nanoparticles of zirconia (ZrO2) were in situ synthesized on the surface of carbon nanotubes by means of liquid phase reactions and a proper heat treatment process. The size of the nanoparticles could be controlled by the amount of zirconium source materials in a solution and its reaction times. In this study, the size of the nanoparticles ranged from several nanometers to twenty nanometers. It was particularly noted that the synthesized zirconia possessed a cubic structure (c-phase) which generally existed as a stable form of zirconia crystals at high temperatures (above 2370 °C) as well as a form of zirconia that could be used for enhancing the fracture toughness of alumina ceramics. Experimental results showed that the mechanical properties of alumina ceramics mixed with in situ synthesized nanoparticles on the surface of carbon nanotubes were much better than that of pristine nanotubes or zirconia nanoparticles alone. The existence of the nanoparticles on the surface of nanotubes results in improving the dispersion and bonding properties of the nanotubes in alumina matrix environment. The fracture toughness of CNT/ZrO2 alumina ceramics was also improved by the mechanism of bridging effect.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to published version due to publisher copyright policy.
Depositing User: epEditor USQ
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - No Department
Date Deposited: 01 Sep 2011 02:16
Last Modified: 09 Sep 2013 05:51
Uncontrolled Keywords: alumina; carbon nanotube; zirconia; alumina ceramics; mechanical property; zirconia nanoparticles
Fields of Research (FOR2008): 09 Engineering > 0913 Mechanical Engineering > 091309 Tribology
10 Technology > 1007 Nanotechnology > 100708 Nanomaterials
09 Engineering > 0912 Materials Engineering > 091201 Ceramics
Socio-Economic Objective (SEO2008): E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
Identification Number or DOI: doi: 10.1016/j.compositesb.2008.03.006
URI: http://eprints.usq.edu.au/id/eprint/18944

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