Dense cordierite containing manganese
AssigneeCorning Glass Works
InventorIrwin M. Lachman
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Abstract
Impervious, unglazed, sintered ceramic products of primarily cordierite crystal phase, exhibiting low coefficients of thermal expansion and having analytical molar composition of about 1.7-2.4 RO . 1.9-2.4 Al.sub.2 O.sub.3 . 4.5-5.2 SiO.sub.2, are formed of mineral batch compositions that are: (a) wholly raw ceramic material wherein RO comprises about 55-95 mole % MnO and 5-45% MgO, or (b) at least about 50 wt.% prereacted cordierite material and the balance thereof raw ceramic material, and wherein RO comprises about 5-40 mole % MnO and 60-95 mole % MgO.
Claims8
An impervious, unglazed, sintered manganese-containing ceramic product having its major and primary crystal phase being cordierite crystal structure, having an analytical molar composition of about 1.7-2.4RO.1.9-2.4Al.sub.2 O.sub.3.4.5-5.2 SiO.sub.2 and made of mineral batch composition selected from:
- (a) wholly raw ceramic material wherein RO comprises, as mole % of RO, about 55-95% MnO and 5-45% MgO, and
- (b) at least about 50 wt. % prereacted cordierite material and the balance thereof being raw ceramic material, and wherein RO comprises, as mole % of RO, about 5-40% MnO and 60-95% MgO.
Dependencies are inferred from the claim text.