Formation of Al2O3–SiC powder from andalusite and carbon
Identifieur interne : 000298 ( France/Analysis ); précédent : 000297; suivant : 000299Formation of Al2O3–SiC powder from andalusite and carbon
Auteurs : A. Amroune [France] ; G. Fantozzi [France] ; J. Dubois [France] ; J.-P Deloume [France] ; B. Durand [France] ; R. Halimi [Algérie]Source :
- Materials Science & Engineering A [ 0921-5093 ] ; 2000.
English descriptors
Abstract
Al2O3–SiC powder has been formed by carbothermal reduction of andalusite, an aluminosilicate mineral (Al2O3·SiO2). The andalusite precursor was mixed to carbon black in a molar ratio (C/SiO2)=5.5. Phase evolution was studied in the temperature range 1260–1550°C. SiC grows in-situ mainly in the form of whiskers. Some whiskers have globules at their tip, indicating that impurities present in the mineral precursor are involved in the vapour–liquid–solid (VLS) whisker growth mechanism. Pure oxides mixed with carbon black and doped with known concentrations of metallic impurities were heat treated and the transformations occurring in these systems were compared with those of andalusite-carbon system. The present work is aimed at studying the reaction conditions for obtaining a powder with favourable characteristics to elaborate Al2O3–SiC-whisker composites by using raw materials of large availability and a simple in-situ synthesis method.
Url:
DOI: 10.1016/S0921-5093(00)00953-9
Affiliations:
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ISTEX:4F1336F3767FBEF2A260D3D94AC4E7464C2484C4Le document en format XML
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The andalusite precursor was mixed to carbon black in a molar ratio (C/SiO2)=5.5. Phase evolution was studied in the temperature range 1260–1550°C. SiC grows in-situ mainly in the form of whiskers. Some whiskers have globules at their tip, indicating that impurities present in the mineral precursor are involved in the vapour–liquid–solid (VLS) whisker growth mechanism. Pure oxides mixed with carbon black and doped with known concentrations of metallic impurities were heat treated and the transformations occurring in these systems were compared with those of andalusite-carbon system. 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Amroune</name><name sortKey="Deloume, J P" sort="Deloume, J P" uniqKey="Deloume J" first="J.-P" last="Deloume">J.-P Deloume</name><name sortKey="Dubois, J" sort="Dubois, J" uniqKey="Dubois J" first="J" last="Dubois">J. Dubois</name><name sortKey="Durand, B" sort="Durand, B" uniqKey="Durand B" first="B" last="Durand">B. Durand</name><name sortKey="Fantozzi, G" sort="Fantozzi, G" uniqKey="Fantozzi G" first="G" last="Fantozzi">G. Fantozzi</name></country><country name="Algérie"><noRegion><name sortKey="Halimi, R" sort="Halimi, R" uniqKey="Halimi R" first="R" last="Halimi">R. Halimi</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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