Patent ID: 8889576

Claim:
Composite ceramic material comprising (a) a first phase based on zirconia containing CeO 2 as stabilizer, and (b) a second phase based on an aluminate, wherein the aluminate is selected from the group consisting of M I AlO 2 , M I 5 AlO 4 , M II Al 2 O 4 , M II 3 Al 2 O 6 , M III AlO 3 , M II M III Al 11 O 19 and mixtures thereof, wherein M I is a monovalent metal, M II is divalent metal and M III is a trivalent metal, and wherein the first phase comprises grains having an average grain size of 100 nm to less than about 1.5 μm and comprises grains having an average grain size of less than about 100 nm.