Synthesis and characterization of pressureless sintered carbon nanotube reinforced alumina nanocomposites

Multiwalled carbon nanotube reinforced alumina nanocomposites were prepared and their sintering behaviour was compared with that of pure alumina. Two types of composites were prepared using different techniques and both contained 1, 2 and 3 wt% of as-received and functionalised carbon nanotubes whic...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2013-08, Vol.578, p.422-429
Main Authors: BAKHSH, N, AHMAD KHALID, F, SAEED HAKEEM, A
Format: Article
Language:English
Subjects:
Aluminum oxide
Applied sciences
Carbon
Carbon nanotubes
Cross-disciplinary physics: materials science
rheology
Degradation
Density
Exact sciences and technology
Materials science
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Methods of nanofabrication
Nanocomposites
Nanoscale materials and structures: fabrication and characterization
Nanostructure
Other topics in nanoscale materials and structures
Physics
Sintering
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Summary:Multiwalled carbon nanotube reinforced alumina nanocomposites were prepared and their sintering behaviour was compared with that of pure alumina. Two types of composites were prepared using different techniques and both contained 1, 2 and 3 wt% of as-received and functionalised carbon nanotubes which were synthesised by pressureless sintering. The mixing and dispersion of carbon nanotubes in alumina was achieved by the novel technique of gas purging sonication. Varying percentages of carbon nanotubes in the composites were compacted using uniaxial pressing followed by sintering at 1600 C in flowing argon. Nanocomposites with 1 wt% carbon nanotubes had 98.5% relative density with no degradation of the carbon nanotubes and increased fracture toughness from 8.1% and 9.4% and Young's modulus by 5% and 7% when compared to as-received and functionalised carbon nanotube nanocomposites respectively with respect to pure alumina. It was also shown that densification can be achieved without degradation of the carbon nanotubes at elevated temperatures in the carbon nanotube-alumina nanocomposites sintered by a conventional route.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2013.04.020