Lanthanide oxides and phosphates for improving properties of hea

Details Lanthanide oxides and phosphates for improving properties of hea Lanthanide oxides and phosphates for improving properties of hea

1989-05-01

1990-10-09

Bell, Mark L.

Compositions: coating or plastic

Coating or plastic compositions

Inorganic settable ingredient containing

501124, C04B 732, C04B 3544

Patent

active

049617869

ABSTRACT:
Certain derivatives of the lanthanide elements greatly enhance the strength of heated alumina refractories in the 500 to 1000 degree Fahrenheit temperature range. Cerium oxide, for example, when added in 1 percent to 5 percent by weight to commercial calcium aluminate cement with tabular alumina aggregate, plus 10 to 30 percent water, and fired at 500 to 1000 degrees Fahrenheit, forms a ceramic bond and becomes as strong as untreated calcium aluminate refractory concrete fired at 2000 degrees Fahrenheit. The cerium modified refractory concrete is 1000 psi to 1500 psi stronger than unmodified refractory concrete at 500 to 1000 degrees Fahrenheit.

REFERENCES:
patent: 4406699 (1983-09-01), Beck et al.
patent: 4619702 (1986-10-01), Gartner
patent: 4661160 (1987-04-01), Novinson
Cotten et al., "Advanced Inorganic Chemistry, A Comprehensive Text", 1962, p. 870-872.

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