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Preparation of Nanocrystalline TiN Coated Cubic Boron Nitride Powders by a Sol–Gel Process

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Abstract:

Cubic boron nitride (cBN) particles coated with 20 wt% nanocrystalline TiN were prepared by coating the surface of cBN particles with TiO2, followed by nitridation with NH3 gas at 900 °C. Coating of TiO2 on cBN powders was accomplished by a sol–gel process from a solution of titanium (IV) isopropoxide and anhydrous ethanol. An amorphous TiOx layer of 50 nm thickness was homogenously formed on the surface of the cBN particles by the sol–gel process. The amorphous layer was then crystallized to an anatase TiO2 phase through calcination in air at 400 °C. The crystallized TiO2 layer was 50 nm in thickness, and the size of TiO2 particles comprising the layer was nearly 10 nm. The TiO2 on cBN surfaces was completely converted into nanocrystalline TiN of uniform particles 20 nm in size on cBN particles by nitridation under flowing NH3 gas.

Keywords: CUBIC BORON NITRIDE; NANOCOMPOSITE; SOL-GEL PROCESS; TITANIUM NITRIDE

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2011.3225

Publication date: January 1, 2011

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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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