Method for the purification of alpha-alumina fibers

The present invention relates to a method for the purification of ±-Al 2 O 3 whiskers previously obtained by vapor-liquid-solid deposition, under metal vapors-containing atmospheres. Said method involves the volatilization of metal impurities in controlled-atmosphere furnaces at the surface of the f...

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Bibliographische Detailangaben
Hauptverfasser:	VALCARCEL JUAREZ, VICTOR, RODRIGUEZ CARREIRA, ALFREDO, GUITIAN RIVERA, FRANCISCO, CERECEDO FERNANDEZ, CARMEN, CAAMANO CASTRO, JOSE MIGUEL
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUSPOLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE APPARATUS THEREFOR CHEMISTRY COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS CRYSTAL GROWTH INORGANIC CHEMISTRY METALLURGY PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE REFINING BY ZONE-MELTING OF MATERIAL SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE SINGLE-CRYSTAL-GROWTH UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL ORUNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL
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Beschreibung
Zusammenfassung:	The present invention relates to a method for the purification of ±-Al 2 O 3 whiskers previously obtained by vapor-liquid-solid deposition, under metal vapors-containing atmospheres. Said method involves the volatilization of metal impurities in controlled-atmosphere furnaces at the surface of the fibers and from the drops at the end of the fibers. The invention also relates to purified ±-Al 2 O 3 whiskers obtainable by a process as defined above and substantially free from metal impurities at the surface and at the end part of the fibers, as well as the use of the purified ±-Al 2 O 3 whiskers as defined above as fillers or reinforcement agents for the preparation of ceramic, metallic or polymeric composites.