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Tricalcium Silicate and Its Stability Within the System CaO‐SiO 2
Author(s) -
WELCH J. H.,
GUTT W.
Publication year - 1959
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.1151-2916.1959.tb09135.x
Subject(s) - liquidus , silicate , phase diagram , eutectic system , mineralogy , calcium silicate , materials science , phase (matter) , congruent melting , lime , analytical chemistry (journal) , geology , chemical engineering , chemistry , metallurgy , microstructure , composite material , organic chemistry , chromatography , engineering
A portion of the system CaO‐SiO 2 has been reinvestigated by high‐temperature microscopy. Direct observations at the liquidus establish a primary‐phase region for tricalcium silicate, which is shown in a revised phase diagram to melt incongruently. The tricalcium silicate primary‐phase field extends from the eutectic with dicalcium silicate at 2050 °C., 69.5% CaO, to the incongruent boundary with lime at 2070°C., 71.5% CaO, with a possible error in composition of ± 0.25%. The estimated accuracy of these temperatures is ±3° relative to one another, and ± 10° relative to the melting points of alumina and dicalcium silicate, for which the values 2040°C. and 2130°C. taken from the literature have been assumed.