Transformation toughened zirconia-titania-yttria ceramic alloys
AssigneeCorning Glass Works
InventorThomas D. Ketcham
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Abstract
This invention is directed to the production of ceramic alloys consisting essentially of ZrO.sub.2, titania, and yttria or rare earth oxides such as gadolinia, ytterbia, neodymia, and ceria. Mole % concentration values as low as 0.25 mole % for yttria have been found to provide a hard and tough ceramic alloy in the presence of the titania-zirconia body. These compositions have been found to produce effective hard and tough ceramic bodies when mixed with refractory fibers and/or whiskers and hard refractory ceramics.
Claims14
An improved ceramic composition consisting essentially of a sintered partially stabilized ZrO.sub.2 ceramic alloy whose composition is selected from:
- (a) composition A consisting essentially of a sintered ceramic alloy consisting essentially of 45 to 94.75 mole percent zirconia, 5 to 45 mole percent titania, and 0.25 to 10 mole percent rare earth oxide selected from the group consisting of Gd.sub.2 O.sub.3, Yb.sub.2 O.sub.3, Nd.sub.2 O.sub.3, Tb.sub.2 O.sub.3, Pr.sub.2 O.sub.3, Dy.sub.2 O.sub.3, Ho.sub.2 O.sub.3, Sm.sub.2 O.sub.3, and Er.sub.2 O.sub.3,
- (b) composition B consisting essentially of a sintered ceramic alloy consisting essentially of 48 to 94.75 mole percent zirconia, 5 to 45 mole percent titania and 0.25 to 7 mole percent yttria, and
- (c) composition C consisting essentially of a sintered ceramic alloy consisting essentially of 35 to 93.5 mole percent zirconia, 5 to 45 mole percent titania, and 1.5 to 20 mole % ceria.
An improved ceramic composition consisting essentially of a sintered partially-stabilized ceramic alloy having a composition consisting essentially of 0.5 to 4.0 mole percent yttria or a rare earth oxide, 22 to 45 mole percent titania, and 51 to 77.5 mole percent zirconia.
Dependencies are inferred from the claim text.