Methods for preparation of tetragonal zirconia polycrystal compo

Details Methods for preparation of tetragonal zirconia polycrystal compo Methods for preparation of tetragonal zirconia polycrystal compo

1995-03-01

1996-09-17

Group, Karl

Compositions: ceramic

Ceramic compositions

Refractory

501126, 501152, C04B 3548

Patent

active

055568165

ABSTRACT:
A method for the preparation of tetragonal zirconia polycrystal composite with high toughness and low-temperature degradation resistance. The method comprising adding transformable TZP of ZrO.sub.2 --Y.sub.2 O.sub.3 --Nb.sub.2 O.sub.5 /Ta.sub.2 O.sub.5 system to non-transformable TZP of ZrO.sub.2 --Y.sub.2 O.sub.3 --Nb.sub.2 O.sub.5 /Ta.sub.2 O.sub.5 system in an amount of not more than 60% by weight based on the total weight of the resulting mixture; and sintering the mixture at above 1,500.degree. C. Even though being exposed to a temperature ranging from 100.degree. to 400.degree. C. for a long time in air, the TZP composite prepared by the present method is rarely transformed into monoclinic zirconia and yet exhibits high toughness.

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