Mechanical Properties of Porous Al2O3 Composite with Surface Modified Multi-Walled Carbon Nanotubes (MWCNTs)
Abstract:Multi-walled carbon nanotubes (MWCNTs) have been reinforced in alumina (Al2O3) matrix to overcome the inherent brittleness of the Al2O3 matrix. In this work, MWCNTs were treated by acid toprovide hydrophilicity to hydrophobic MWCNTs, inducing the homogeneous dispersion of MWCNTsin an aqueous solution. Aluminum hydroxide (Al(OH)3) as a Al2O3 precursor was added in the solution with the modified MWCNTs, and then this mixture solution was filtered at room temperature.The prepared powders were calcinated at 800∼1000 °C to reduce the gas pocket in the matrix by decomposition of Al(OH)3. Then the calcinated powders were formed, and heat-treated. The porous MWCNTs–Al2O3 composites show higher mechanical properties in flexure strength and hardness than the porous Al2O3 without the reinforcement phase, which is attributed to the high mechanical properties of MWCNTs. However, higher MWCNTs contents in the composites decrease the mechanical properties due to the aggregation of MWCNTs in the composites. Therefore, control of the MWCNTs content and its dispersibility in the matrix are key factors to be considered for the fabrication of the porous MWCNT–Al2O3 composites.
Document Type: Research Article
Publication date: August 1, 2011
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