Al.sub.2 O.sub.3 /ZrO.sub.2 ceramic

Details Al.sub.2 O.sub.3 /ZrO.sub.2 ceramic Al.sub.2 O.sub.3 /ZrO.sub.2 ceramic

1980-07-14

1982-02-23

Poer, James

Compositions: ceramic

Ceramic compositions

Refractory

C04B 3548

Patent

active

043169643

ABSTRACT:
Fracture toughness and strength of an Al.sub.2 O.sub.3 /ZrO.sub.2 ceramic is increased by incorporating metastable grains of tetragonal ZrO.sub.2 in the structure. During cracking, the metastable tetragonal ZrO.sub.2 transforms to a stable monoclinic structure thus increasing the energy required for the crack to propagate and retarding its growth. The ZrO.sub.2 occupies from 5 to 95% of the volume of the ceramic and has dissolved in it a rare earth oxide such as Y.sub.2 O.sub.3, CeO.sub.2, La.sub.2 O.sub.3 and/or Er.sub.2 O.sub.3 to promote retention of the metastable tetragonal ZrO.sub.2.

REFERENCES:
patent: 3761295 (1973-09-01), Hulse et al.
patent: 4155124 (1979-05-01), Kawahara et al.
patent: 4218253 (1980-08-01), Dworak et al.
patent: 4221650 (1980-09-01), Friese et al.

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