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Bulk Crystallization of Glasses Belonging to the Calcia—Zirconia—Silica System by Microwave Energy
Author(s) -
Siligardi Cristina,
D'Arrigo Maria Cristina,
Leonelli Cristina,
Pellacani Gian Carlo,
Cross Tom E.
Publication year - 2000
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.1151-2916.2000.tb01318.x
Subject(s) - crystallization , materials science , microwave , microstructure , cubic zirconia , silicate , mineralogy , microanalysis , ceramic , analytical chemistry (journal) , silicate glass , dielectric , chemical engineering , composite material , chemistry , physics , optoelectronics , organic chemistry , chromatography , quantum mechanics , engineering
This paper reports results that show the effect of microwave absorption on the bulk crystallization of two glasses in the CaO—ZrO 2 —SiO 2 system. The glass samples were devitrified using either microwave or conventional heating, to compare the results obtained from the two different techniques. Remarkably different crystallization paths were observed, depending mostly on the composition of the glass. This observation was especially true when microwave heating was used, where the dielectric losses observed in silicate glasses are related to the ZrO 2 content. X‐ray diffraction analysis was performed on the powdered samples, to determine the crystalline phases present. The microstructure and microanalysis results of these glass‐ceramic compositions are presented and are related to the different ZrO 2 contents.