Ceramic bodies formed from yttria stabilized zirconia-alumina

Details Ceramic bodies formed from yttria stabilized zirconia-alumina Ceramic bodies formed from yttria stabilized zirconia-alumina

1990-02-26

1991-09-03

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Pore-forming

501 95, 501105, 264 44, 2105101, 75411, 75412, C04B 3800, C04B 3548, C04B 3580

Patent

active

050455117

ABSTRACT:
Ceramic bodies suitable for use in the filtration of molten metal are formed by immersing a porous organic substrate material in an aqueous thixotropic slurry containing yttria, zirconia and alumina; expelling excess slurry; drying the impregnated material; and heating to an elevated temperature to burn off the organic material and sinter the ceramic materials. The resulting zirconia-alumina ceramic bodies have from about 5-80% of the zirconia in a monoclinic phase and the remainder of the zirconia essentially in a stabilized cubic phase due to the yttria. The ceramic bodies thus produced have excellent strength, density, and thermal shock resistance properties.

REFERENCES:
patent: 3893917 (1975-07-01), Pryor et al.
patent: 4024212 (1977-05-01), Dole et al.
patent: 4035191 (1977-07-01), Johns
patent: 4265659 (1981-05-01), Blome
patent: 4789651 (1988-12-01), Sugie et al.
patent: 4839049 (1989-06-01), Kinney, Jr. et al.

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