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PREPARATION AND PROPERTIES OF NANOMETER ALUMINA POWDERS

Jing Wang, Gao Hong

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Abstract

Alumina powdes of 20-30mm were synthesized from aluminum alkoxide by Sol-Gel process. Its properties and phase structure were sutdied by IR, TG-DTA, X-ray deffraction and TEM. The results showedthat hydrolysis of aluminium alkoxides produced boehmite. In calcining hoehmite changed from amorphousmonohychroxide to -Al2O3 to Al2O3, to Al2O3 and its structure changed from irregular network toneedle to globe to dumbbell. Considering the experimental results, is was pointal out that alumina powders existed below 1200℃, over this temperature the powder sintered.

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What this paper is about

Alumina powdes of 20-30mm were synthesized from aluminum alkoxide by Sol-Gel process. Its properties and phase structure were sutdied by IR, TG-DTA, X-ray deffraction and TEM. The results showedthat hydrolysis of aluminium alkoxides produced boehmite. In calcining hoehmite changed from amorphousmonohychroxide to -Al2O3 to Al2O3, to Al2O3 and its structure changed from irregular network toneedle to globe to dumbbell. Considering the experimental results, is was pointal out that alumina powders existed below 1200℃, over this temperature the powder sintered.

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Available abstract

Alumina powdes of 20-30mm were synthesized from aluminum alkoxide by Sol-Gel process. Its properties and phase structure were sutdied by IR, TG-DTA, X-ray deffraction and TEM. The results showedthat hydrolysis of aluminium alkoxides produced boehmite. In calcining hoehmite changed from amorphousmonohychroxide to -Al2O3 to Al2O3, to Al2O3 and its structure changed from irregular network toneedle to globe to dumbbell. Considering the experimental results, is was pointal out that alumina powders existed below 1200℃, over this temperature the powder sintered.

Key concepts: Boehmite, Calcination, Materials science, Alkoxide, Nanometre, Aluminium, Chemical engineering, Phase (matter)

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