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Effect of TiO 2 , Fe 2 O 3 , and Alkali on Mineralogical and Physical Properties of Mullite‐Type and Mullite‐Forming Al 2 O 3 ‐SiO 2 Mixtures: I
Author(s) -
SKINNER KENNETH G.,
COOK W. HOWARD,
POTTER RALPH A.,
PALMOUR HAYNE
Publication year - 1953
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.1151-2916.1953.tb12816.x
Subject(s) - mullite , alkali metal , materials science , mineralogy , phase (matter) , inorganic chemistry , analytical chemistry (journal) , metallurgy , chemistry , ceramic , organic chemistry , chromatography
This report gives the results of the first phase of an investigation to determine the effects of TiO 2 , Fe 2 O 3 , and alkalis on mullite‐forming Al 2 O 3 ‐SiO 2 mixtures. Preliminary tests indicated that the effects of TiO 2 might depend on the Al 2 O 3 ‐SiO 2 ratio. Therefore an Al 2 O 3 ‐SiO 2 ‐TiO 2 sub‐system was studied which indicated that 5% TiO 2 might be beneficial. Test bars with a composition of 5 TiO 2 , 65 Al 2 O 3 , 30% SiO 2 not only had the highest mullitization but also had satisfactory physical properties. A second series of tests was made in which Fe 2 O 3 and/or alkali was substituted for all or part of the 5% TiO 2 . Fe 2 O 3 and TiO 2 reacted similarly in quantities up to 2 or 3%; however, more than 2% alkali was generally harmful. More TiO 2 could be tolerated than Fe 2 O 3 , especially in the presence of more than 1% alkali. These conclusions are based only on data for sintered materials and may not apply to fused materials.