Ceramic bodies formed from yttria stabilized zirconia-alumina
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United States of America Patent
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Sep 3, 1991
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N/A
app pub date -
Feb 26, 1990
filing date -
Feb 26, 1990
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Expired
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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.
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