Compositions: ceramic – Ceramic compositions – Refractory
Patent
1984-10-15
1986-02-04
McCarthy, Helen M.
Compositions: ceramic
Ceramic compositions
Refractory
264 60, 501128, 501153, C04B 3510
Patent
active
045686521
ABSTRACT:
A method for improving the high temperature properties of 42 to 70 percent by weight Al.sub.2 O.sub.3 containing alumina refractories by adding thereto a soluble metal compound and firing to at least 1450.degree. C. for a time sufficient to convert the soluble metal compound to a refractory oxide or phase and for the refractory oxide or phase to react with the non-Al.sub.2 O.sub.3 constituents of the refractory for preventing or reducing the presence or effect of detrimental compounds or phases on the high temperature properties of the refractory. The resulting relatively low Al.sub.2 O.sub.3 content, porous, alumina refractory includes within its pores from 1 to 10% by weight of a refractory oxide or phase and is characterized by high temperature property values substantially greater than the corresponding values for the same refractory body without said refractory oxide or phase in its pores.
REFERENCES:
patent: 3192058 (1965-06-01), Davies et al.
patent: 3734767 (1973-05-01), Church et al.
patent: 3789096 (1974-01-01), Church et al.
patent: 4397963 (1983-08-01), Morgan
Koltos E. Philip
McCarthy Helen M.
The United States of America as represented by the Secretary of
Zack Thomas
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