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 Phase equilibrium relationships in the system Al2O3-TiO2-MnO, relevant to the low-temperature sintering of alumina
Please use this identifier to cite or link to this item http://hdl.handle.net/10773/5160

title: Phase equilibrium relationships in the system Al2O3-TiO2-MnO, relevant to the low-temperature sintering of alumina
authors: Moreira, M. C.
Segadães, A. M.
issue date: 1996
publisher: Elsevier
abstract: A great deal of research work has been devoted to lowering the sintering temperature of ceramic powders of varied nature, to fulfil a variety of purposes. Both experimentation and theory show that the sintering temperature of alumina can be lowered to 1400 degrees C and below by using small particle sizes and certain additives like TiO2 and/or MnO. The general idea is that sintering is aided by the development of a liquid phase at this low temperature, due to the presence of the additives. However, there is no phase diagram available to throw light on this matter. I;br this reason, the present work was aimed at investigating the phase equilibrium relationships in the ternary, non-condensed system Al2O3-TiO2-MnO, in air. Selected compositions in this system were prepared from reagent-grade oxides, uniaxially pressed into 6 mm cylindrical pellets, fired at temperatures between 1000 and 1650 degrees C for 2 to 22 h, water-quenched, and observed by X-ray diffraction and scanning electron microscopy, the composition of some of the phases identified being evaluated by energy-dispersive spectroscopy. These experiments led to the definition of the compatibility triangles and a tentative location of the boundary curves between primary phase fields is presented. @ 1996 Elsevier Science Limited.
URI: http://hdl.handle.net/10773/5160
ISSN: 0955-2219
publisher version/DOI: http://dx.doi.org/10.1016/0955-2219(96)00024-6
source: Journal of the European Ceramic Society
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