Synthesis of spherical Al2O3 and AlN powder from C@Al2O3 composite powder

A novel approach has been taken to produce (1) spherical Al2O3 particles by decarbonisation and (2) spherical AlN particles by nitridation and subsequent decarbonisation of C@Al2O3 composite particles. C@Al2O3 composite particles have been prepared by heterogeneous nucleation and crystallisation of...

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Bibliographic Details
Published in:Journal of materials science 2006-08, Vol.41 (15), p.4699-4705
Main Authors: CHOWDHURY, Sabdar Aman, HIMADRI SEKHAR MAITI, BISWAS, Sampad
Format: Article
Language:English
Subjects:
Aluminum nitride
Aluminum oxide
Carbon
Chemistry
Colloidal gels. Colloidal sols
Colloidal state and disperse state
Content analysis
Crystallites
Crystallization
Electron microscopes
Exact sciences and technology
General and physical chemistry
Materials science
Nitrates
Nucleation
Overpressure
Particulate composites
Physical and chemical studies. Granulometry. Electrokinetic phenomena
Powders
Spherical powders
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Summary:A novel approach has been taken to produce (1) spherical Al2O3 particles by decarbonisation and (2) spherical AlN particles by nitridation and subsequent decarbonisation of C@Al2O3 composite particles. C@Al2O3 composite particles have been prepared by heterogeneous nucleation and crystallisation of Al(NO3)3 on surfactant encapsulated carbon nano particles followed by evaporative decomposition of the nitrate. Overpressure (0.4 MPa) of nitrogen and a temperature range (1723-1873 K) have been used for nitridation. Whiskers as well as spherical particles of AlN have been observed in the final product. The final product has been characterised by X-Ray Diffraction, Scanning Electron Microscope and Carbon-Hydrogen-Nitrogen content analysis by Elemental Analyser and the mechanism of the nitridation reaction has been analysed. The average size of the spherical AlN particles consisting of crystallites in nano-dimensions (30-50 nm) could be varied from 100 nm to 8 mum by changing the composition of the sol.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-006-0039-2