PRODUCTION OF FINE POWDER OF ALUMINIUM OXIDE

The novelty consists in an industrial process based on the utilisation of cyclic explosions, in a solid stage, of an oxidising component mixed with high granulometry aluminium to obtain micro- and nano-dust of aluminium oxide which purity exceeds 99.7%, essencially in the form of alpha crystalline.T...

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Bibliographic Details
Main Authors MENDES, RICARDO, CASTRO, PEDRO DE MELLO, SILVA, JOAO MANUEL CALADO DA, CAMPOS, JOSE
Format Patent
LanguageEnglish
Published 25.08.2006
Subjects
CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY
CHEMISTRY
COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS
EXPLOSIVES
EXPLOSIVES OR THERMIC COMPOSITIONS
INORGANIC CHEMISTRY
MANUFACTURE THEREOF
MATCHES
METALLURGY
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
THEIR RELEVANT APPARATUS
TRANSPORTING
USE OF SINGLE SUBSTANCES AS EXPLOSIVES
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Summary:The novelty consists in an industrial process based on the utilisation of cyclic explosions, in a solid stage, of an oxidising component mixed with high granulometry aluminium to obtain micro- and nano-dust of aluminium oxide which purity exceeds 99.7%, essencially in the form of alpha crystalline.The process is competitive because of its capacity to transform granulated aluminum of over 150 micra into aluminium oxide with a granulometry under 5 micra.The starting system of the direct and repetitive cycle is based on a high electric current discharge over an explosive metallic bridge. This discharge creates a fast vaporisation (in hundreds of nanoseconds) and generates a partially ionised gas (metallic plasma) which iniciates the explosive compound.
Bibliography:Application Number: HK20060103604