Effect of different oxide additives on colloidal processing and sintering of alumina
authors Olhero, SM; Ferreira, JMF
editors Martins, R; Fortunato, E; Ferreira, I; Dias, C
nationality International
journal ADVANCED MATERIALS FORUM II
author keywords alumina; sintering additives; colloidal processing; oxide ceramics
keywords MICROSTRUCTURAL DEVELOPMENT; DENSIFICATION
abstract The influence of sintering additives on colloidal processing of alumina, such as rheological behaviour, packing ability, and on sintering behaviour at different temperatures, was investigated. Flow measurements of suspensions with different solids loadings (50, 55 and 60-vol.%) in the presence of the sintering additives revealed that even the most concentrated one is still fluid enough for pouring operations. Comparing the alumina suspensions without and with sintering additives, the last ones present lower viscosity values and, consequently a much better packing ability. Green densities around 65% of the theoretical density were obtained. After sintering at different temperatures, 1250, 1350 and 1450degreesC, high densification up to 95% of the theoretical density was attained at a temperature as low as 1350degreesC, while almost full dense microstructures were obtained on sintering at 1450degreesC.
publisher TRANS TECH PUBLICATIONS LTD
issn 0255-5476
isbn 0-87849-941-5
year published 2004
volume 455-456
beginning page 216
ending page 220
web of science category Materials Science, Multidisciplinary
subject category Materials Science
unique article identifier WOS:000222018500047

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