Preparation and Mechanical Properties of Carbon Nanotubes Reinforced Alumina Ceramic Composite

Abstract:

How to uniformly disperse carbon nanotubes (CNTs) and densely sinter green body are the key issues to prepare carbon nanotubes reinforced alumina (Al₂O₃) composite. We prepare CNTs-Al₂O₃ powder by shearing extruding dispersion method, and then obtain CNTs-Al₂O₃ composite by hydrogen atmosphere pressureless sintering. 93% of the relative increased fracture toughness can be achieved, when the CNTs content of composite is 1%. Because of Absorbing energy by pulling CNTs out from alumina matrix and refining grain by CNTs bundles sitting along alumina grain, the fracture toughness is improved obviously. By XRD and SEM analysis, the residual tensile stress which is caused by embedding CNTs into alumina matrix also plays an important role for the increase of fracture toughness.

• Periodical: Advanced Materials Research (Volumes 239-242)
• Pages: 2721-2727
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.239-242.2721
• Online since: May 2011
• Authors: Xi Wang Wu, Jian Zhong Xiao, Feng Xia, Yong Gang Hu, Zhou Peng
• Keywords: Alumina, Carbon Nanotube (CN), Composite, Thoughness

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