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THE EFFECT OF MAGNESIA ON THE DEVITRIFICATION OF A SODA‐LIME‐SILICA GLASS 1
Author(s) -
Morey George W.
Publication year - 1930
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.1151-2916.1930.tb16218.x
Subject(s) - tridymite , devitrification , mineralogy , melting point , cristobalite , materials science , diopside , magnesium , lime , phase (matter) , soda lime , analytical chemistry (journal) , metallurgy , crystallization , chemical engineering , chemistry , composite material , quartz , organic chemistry , chromatography , engineering
The effect of magnesia on the devitrifimtion of a certain soda‐lime‐silica glass has been ascertained. The initial glass had a composition 1.15Na 2 O.0.84CaO.6SiO 2 , and tridymite separated as primary phase. On substitution of MgO for CaO, tridymite remained primary phase, and the melting point was lowered, but the curve shows double inflection. Addition of 2% of MgO lowered the melting point almost 200°, with the glass passing from the field of tridymite to that of Na 2 O.3CaO.6SiO 2 , but with more than 3%, MgO diopside became the primary phase, and the melting point rapidly increased.