Toughened ceramics

Details Toughened ceramics Toughened ceramics

1987-11-13

1989-12-12

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Refractory

501103, 501152, C04B 3548

Patent

active

048867683

ABSTRACT:
Novel partially stabilized zirconia ceramic compositions exhibiting improved toughness comprising: a major component consisting of ZrO.sub.2, a minor stabilizing component Y.sub.2 O.sub.3 and an effective amount of a toughening agent (e.g., Ta.sub.2 O.sub.5). The toughness of the tetragonal zirconia polycrystal (e.g., 96% ZrO.sub.2, 3 mole % Y.sub.2 O.sub.3) can be increased nearly three-fold by replacing 1% of the ZrO.sub.2 with Ta.sub.2 O.sub.5. Empirical equations based on ratios of fundamental lattice parameters (e.g. c/a) quantitatively relating to the stability/instability of tetragonal zirconia oxide are disclosed and used in a novel method for improving the toughness of the ceramic compositions.

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Choudhary et al, Electrical Conduction in the Cubic Fluorite Phase in the stem ZrO.sub.2 -YO.sub.1.5 -TaO.sub.2.5 (1979).
Jordan et al, Phase Distribution in the HfO.sub.2 -Er.sub.2 O.sub.3 -Ta.sub.2 O.sub.5 System (1985).

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