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Control of the Properties of Glazes by the Aid of Eutectics
Author(s) -
WATTS ARTHUR S.
Publication year - 1961
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.1151-2916.1961.tb15377.x
Subject(s) - eutectic system , ceramic , frit , mineralogy , materials science , distilled water , oxide , chemistry , metallurgy , chromatography , microstructure
The alkaline earth‐boric oxide‐silica systems are especially important in the compounding of ceramic glazes and bodies because they enable the introduction of B 2 O 3 in an insoluble form. Published equilibrium eutectics and other low‐temperature invariant points were investigated regarding temperatures and rates of deformation. Most of these compositions were found to be soluble in acid, alkaline, and phosphate solutions; tests in distilled water at 195°F. for 5 days therefore were chosen as the means of selecting the compositions which would be practical for use in the development of ceramic glazes. The systems BaO‐B 2 O 3 ‐SiO 2 , CaO‐B 2 O 3 ‐SiO 2 , and SrO‐B 2 O 3 ‐SiO 2 were studied first separately; the insoluble composition highest in B 2 O 3 in each system was chosen for the triaxial study of the system alkaline earth‐boric oxide‐silica as a source of B 2 O 3 in glazes and perhaps as a B 2 O 3 ‐bearing frit in ceramic bodies. Each of these insoluble glasses was also studied for the effect of limited change in composition on softening temperature and rate of deformation.