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Sintering and Crystallization of CaO–Al 2 O 3 –ZrO 2 –SiO 2 Glasses Containing Different Amount of Al 2 O 3
Author(s) -
Siligardi Cristina,
Lusvarghi Luca,
Montorsi Monia,
Vernia Cecilia
Publication year - 2008
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2007.02220.x
Subject(s) - anorthite , sintering , wollastonite , materials science , crystallization , mineralogy , phase (matter) , viscosity , aluminium oxides , base (topology) , analytical chemistry (journal) , chemical engineering , metallurgy , composite material , raw material , chemistry , mathematical analysis , biochemistry , mathematics , organic chemistry , chromatography , engineering , catalysis
In this work several complementary techniques have been employed to carefully characterize the sintering and crystallization behavior of CaO–Al 2 O 3 –ZrO 2 –SiO 2 glass powder compacts after different heat treatments. The research started from a new base glass 33.69 CaO–1.00 Al 2 O 3 –7.68 ZrO 2 –55.43SiO 2 (mol%) to which 5 and 10 mol% Al 2 O 3 were added. The glasses with higher amounts of alumina sintered at higher temperatures (953°C [lower amount] vs. 987°C [higher amount]). A combination of the linear shrinkage and viscosity data allowed to easily find the viscosity values corresponding to the beginning and the end of the sintering process. Anorthite and wollastonite crystals formed in the sintered samples, especially at lower temperatures. At higher temperatures, a new crystalline phase containing ZrO 2 (2CaO·4SiO 2 ·ZrO 2 ) appeared in all studied specimens.