Production of alumina ceramics reinforced with .beta.'"-alumina

Details Production of alumina ceramics reinforced with .beta.'"-alumina Production of alumina ceramics reinforced with .beta.'"-alumina

1990-11-27

1992-01-14

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Aluminum compound containing

501119, 501125, C04B 3510

Patent

active

050810820

ABSTRACT:
A process for producing strong alumina ceramics in which needle-shaped .beta.'"-alumina grains are homogeneously distributed in an .alpha.-alumina matrix to provide an increase in bending strength, as compared to the alumina ceramics without .beta.'"-alumina, when fired under similar conditions. The process comprises mixing .alpha.-alumina powder and salts of sodium and magnesium, in a Na:Mg mol ratio of 1:2; wet-mixing and calcining the mixture to form a mixture of (100-5X) mols of Al.sub.2 O.sub.3 +X(Na.sub.2 O+4MgO), wherein X is the number of mols and is not more than 3; forming a dense green body of the calcined mixture and sintering the green body at a temperature and for a time sufficient to form in-situ particles of .beta.'"-alumina distributed in the .alpha.-alumina.

REFERENCES:
patent: 3535163 (1916-11-01), Dziecoich et al.
patent: 3895963 (1975-07-01), McGolann et al.
patent: 3903225 (1975-09-01), Jones et al.

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