Superstoichiometric MgAl.sub.2 O.sub.4 spinel and use thereof, a

Details Superstoichiometric MgAl.sub.2 O.sub.4 spinel and use thereof, a Superstoichiometric MgAl.sub.2 O.sub.4 spinel and use thereof, a

1994-02-22

1996-02-20

Group, Karl

Compositions: ceramic

Ceramic compositions

Refractory

423600, C04B 35443

Patent

active

054928710

ABSTRACT:
A superstoichiometric MgAl.sub.2 0.sub.4 spinel, which can be used, for example, as material for a high temperature crucible, is synthesized by, producing a precursor mixture comprising intimately mixed oxides of the corresponding metals in the spinel. Magnesium is added in a superstoichiometric amount to the precursor mixture. Prior to spinel formation, from one to five percent by weight of a reactive salt containing fluorine and/or boron, based on the metal oxides of the spinel, are added to the precursor mixture, and the doped precursor mixture is mixed for from 0.5 to 3 hours. Finally, the mixed precursor mixture is heated for between 0.5 and 4 hours at a temperature between 1150.degree. C. and 1400.degree. C. to synthesize the Mg.sub.(1+x) Al.sub.2 0.sub.4 spinel which is superstoichiometric with respect to magnesium.

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Chemical Abstracts 113(24): 215347f (1990).
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