Article ID Journal Published Year Pages File Type
1447019 Acta Materialia 2011 9 Pages PDF
Abstract
In this contribution recent results on catalyst-free synthesis of new structures consisting of boron nitride (BN) and carbon-boron nitride (C-BN) are presented. Light-induced heating of fine grained graphite-like h-BN powders and a h-BN-lamp black composite was performed. The new structures of BN and C-BN were produced in a flow of dried and purified nitrogen in an optical furnace. The structure and phase composition were studied by transmission electron microscopy, scanning electron microscopy, optical microscopy and X-ray diffraction. It was shown that the BN whiskers obtained consist of multiwalled nanotubes covered by a polycrystalline shell. The processes of synthesis, formation and growth of the nanostructures in an optical furnace were analyzed. A qualitative model of the formation and growth of BN nanotubes and whiskers based on the release of gas from the powders and evolution of bubbles is proposed.
Related Topics
Physical Sciences and Engineering Materials Science Ceramics and Composites
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