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Glass‐Forming Ability and Crystallization Tendency Evaluated by the DTA Method in the Na 2 O–B 2 O 3 –Al 2 O 3 System
Author(s) -
Wakasugi Takashi,
Ota Rikuo,
Fukunaga Jiro
Publication year - 1992
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.1151-2916.1992.tb04398.x
Subject(s) - crystallization , liquidus , supercooling , analytical chemistry (journal) , crystallography , differential thermal analysis , materials science , mineralogy , chemistry , thermodynamics , phase (matter) , physics , diffraction , optics , chromatography , organic chemistry
In order to evaluate the crystallization tendency of glasses, the ratio of the crystallization temperature to the liquidus temperature ( T c / T L ) was obtained by DTA measurement for the Na 2 O–B 2 O 3 and Na 2 O–B 2 O 3 –Al 2 O 3 systems. The critical cooling rate for glass formation ( Q *) was also measured. The measurements were performed in the composition range of (100 − x )Na 2 O–( x )B 2 O 3 , ( x = 25–35 and 60–100 mol%), and (100 − y )0.5Na 2 O·0.5B 2 O 3 −( y )Al 2 O 3 , ( y = 6–34 mol%). The relationship between T c / T L and Q * was discussed. A linear relationship between T c / T L and log Q * for these systems was found. Furthermore, the relationship between T c / T L and Q * was verified by computer simulation based on the crystallization kinetics of glass or supercooled liquid.