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Title: | Phase equilibrium relationships in the system Al2O3-TiO2-MnO, relevant to the low-temperature sintering of alumina |
Author: | 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. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/5160 |
DOI: | 10.1016/0955-2219(96)00024-6 |
ISSN: | 0955-2219 |
Appears in Collections: | DEMaC - Artigos |
Files in This Item:
File | Description | Size | Format | |
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PDiag A-T-M JECS v16 (1996).pdf | Documento principal | 1.01 MB | Adobe PDF |
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