Processing of glass-ceramics in theSiO(2)-Al2O3-B2O3-MgO-CaO-Na2O-(P2O5)-F system via sintering and crystallization of glass powder compacts


Glass-ceramics were produced by crystallization of glasses in the SiO2-Al2O3-B2O3-MgO-CaO-N2O-F system. The experimental results showed that bulk glasses are prone to surface crystallization. Hence, crystallization of bulk glasses resulted in non-homogeneous crystalline materials, which comprised relatively coarse crystals. Therefore, processing was realized using (glass-powder compacts. Maximum densification was reached at 700-750 degrees C. This interval is positioned at relatively lower temperatures than those often reported for similar sintered glass-ceramics. Doping with P2O5 improved sintering behaviour and broadened sintering temperature range. Sintering between 750 and 800 degrees C resulted in materials, which exhibited dense crystalline microstructure and the maximum flexural strength. (C) 2005 Elsevier Ltd and Techna Group S.r.l. All rights reserved.



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Materials Science


Tulyaganov, DU; Agathopoulos, S; Fernandes, HR; Ferreira, JMF

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