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Studies in the System BaO‐Al 2 O 3 −SiO 2 : VI, The System Celsian‐Silica‐Alumina *
Author(s) -
SEMLER C. E.,
FOSTER W. R.
Publication year - 1970
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.1151-2916.1970.tb15979.x
Subject(s) - mullite , eutectic system , materials science , isothermal process , mineralogy , solid solution , microstructure , metallurgy , thermodynamics , chemistry , physics , ceramic
Phase equilibrium relations in the celsian‐silica‐alumina portion of the system BaO‐Al 2 O 3 −SiO 2 were revised on the basis of data obtained from isothermal firing and from the quenching method. These data verify the existence of a celsian‐silica compatibility join by reducing the extent of the mullite field shown in previous diagrams and extending the boundaries of the celsian primary field. The system celsian‐silica‐alumina is divided into two ternary subsystems, one having a eutectic point and the other an invariant reaction point. The eutectic for the subsystem celsian‐silica‐mullite is located at BaO 19, Al 2 O 3 15, and SiO 2 66 wt% and 1296°± 3°C. The pertinent invariant point for the subsystem celsian‐mullite‐alumina, located at BaO 26, Al 2 O 3 27, and SiO 2 47 wt% and 1554°± 4°C, is a reaction point.