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Fabrication of Nanosized Al2O3 Coated Reinforcing Particle Using Electrostatic Force

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Titanium carbide (TiC) particles have been coated with aluminum (Al) phase to enhance the compatibility with a metal matrix based on Al, expecting the homogenous dispersion of TiC particles into the matrix. The TiC particles were uniformly dispersed in the aqueous solution of pH 12. The aluminum nitrate as a precursor of Al phase was added to the solution dispersed with the TiC particles. The coating of Al phase onto the TiC particle was driven by the attractive force between the TiC particle with a negative charge and the Al cation in the aqueous solution. The TiC was not oxidized after heat treatment at 500 °C, whereas titanium dioxide peaks are detected after heat treatment at 1000 °C. In addition, the Al phase coated on the TiC surface was converted to amorphous alumina (Al2O3) and crystallized into α-Al2O3 during heat treatment at 500 and 1000 °C, respectively. The heat treatment condition such as atmosphere and temperature was an important factor in fabricating the reinforcing particles without degradation such as oxidation and phase transformation. The nano-sized Al2O3 coated reinforcing particles could be well fabricated using electrostatic force in the aqueous solution and by controlling the heat treatment condition.
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Document Type: Research Article

Publication date: March 1, 2013

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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