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Transactions of the INDIAN CERAMIC SOCIETY   Vol. 60  2001
Densification and Mechanical Properties of Sol-Gel Alumina : Effect of Sinter Additives
K. Vishista, D. Doni Jayaseelan* and F. D. Gnanam
Pages : 141-144
DOI : 10.1080/0371750X.2001.10799988
Abstract
Boehmite sol was prepared by hot water hydrolysis of aluminium iso-propoxide using nitric acid as a catalyst. Hydrolysis was carried out at 80°C, magnesium nitrate and silver nitrate were added so that peptization was complete at 80°C for 1 h. The sol was precipitated in ammonia, the precipitate was centrifuged at 9000 rpm for 20 min, dried at 120°C and calcined at 600°C for three hours. The amount of magnesium oxide was kept constant at 0.5 wt"k and that of silver oxide was varied from 0.5 to 10 wt%. The powder was compacted into cylindrical pellets using uniaxial press at 180 MPa and sintered at 1400°C for 3 h. 94% T.D. was achieved for 1.0 wt% silver oxide content. Mechanical proper· ties such as hardness, fracture toughness for compacts con· taining various concentrations of silver oxide were studied. The results showed that there was an increase in fracture toughness of alumina ceramics with increasing silver oxide content.
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