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PHYSICAL CHEMISTRY OF FIRING STEATITE CERAMICS *
Author(s) -
Stone R. L.
Publication year - 1943
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.1151-2916.1943.tb14453.x
Subject(s) - forsterite , talc , cordierite , mineralogy , ceramic , atmospheric temperature range , materials science , refractory (planetary science) , chemistry , metallurgy , thermodynamics , physics
A bstract The composition of normal as well as low‐loss steatite bodies is shown on the MgO‐Al 2 O 3 ‐SiO 2 phase diagram. Clay‐talc bodies containing 10% or less of clay have the longest firing range. Bodies near the forsterite corner of the clinoenstatite‐forsterite‐cordierite triangle have a firing range of about 100 °C. but they are too refractory. Auxiliary fluxes, such as CaO and BaO, shorten the firing range appreciably. The alkalis lengthen it but are electrically detrimental. The RO 2 elements, such as SiO 2 and ZrO 2 , when added in appreciable quantities, give good firing range but an excessive increase in the refractoriness of the body.