Lowering Crystallization Temperatures by Seeding in Structurally Diphasic Al 2 O 3 ‐MgO Xerogels
Authors:
- 1 September 1985
- journal article
- Published by Wiley in Journal of the American Ceramic Society
- Vol. 68 (9) , C‐238-C‐240
Abstract
Thermal reactions in 93% Al 2 O 3 ‐7% MgO and 95.8% Al 2 O 3 ‐4.2% MgO gels seeded with α‐Al 2 O 3 , MgAl 2 O 4 , α‐Fe 2 O 3 , and SiO 2 , sols were investigated by differential thermal analysis to determine the extent of nucleation catalysis of solid‐state reactions. Seeding with α‐Al 2 O 3 lowered the α‐Al 2 O 3 crystallization temperature in these xerogels by 100° to 150°C. Spinel seeds have much less effect on the γ‐α transition, and α‐Fe 2 O 3 and SiO 2 seeds do not affect it significantly. Isostructural seeding of gels may therefore permit lower ceramic processing temperatures.Keywords
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