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FUSION EXPERIMENTS IN SYSTEM MgO‐FeO‐Cr 2 O 3 ‐Al 2 O 3 *
Author(s) -
Baumann Henry N.
Publication year - 1944
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.1151-2916.1944.tb14479.x
Subject(s) - spinel , chromium , mineralogy , crystallization , materials science , chemical composition , metallurgy , chromite , oxide , analytical chemistry (journal) , chemistry , organic chemistry , chromatography
A bstract Various methods have been suggested and tried for modifying chrome ores for refractory use. Chrome ores vary widely in chemical composition but are made up chiefly of MgO, Al 2 O 3 , FeO, and Cr 2 O 3 combined as a member of an isomorphous spinel‐type series. The problem of modifying chrome refractories by chemical and thermal treatment therefore involves a knowledge of the system MgO‐FeO‐Cr 2 O 3 ‐Al 2 O 3 . The present study is based on experiments in which two series of chromium oxide‐alumina fusions containing 10% and 30% Cr 2 O 3 , respectively, were fused in an electric‐arc furnace with MgO up to 5% and with FeO up to 5%. The determination of the effect of silica and titania on the primary crystallization of these fusions, as indicated by a petrographic method of examination, was the chief purpose of this work.