Ternary ceramic alloys of ZR-CE-HF oxides

Details Ternary ceramic alloys of ZR-CE-HF oxides Ternary ceramic alloys of ZR-CE-HF oxides

1989-03-14

1990-11-20

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Refractory

501102, 501134, C04B 3548

Patent

active

049719335

ABSTRACT:
A ternary ceramic alloy which produces toughening of zirconia and zirconia composites through the stress transformation from tetragonal phase to monoclinic phase. This alloy, having the general formula Ce.sub.x Hf.sub.y Zn.sub.1-x-y O.sub.2, is produced through the addition of appropriate amounts of ceria and hafnia to the zirconia. Typically, improved toughness is achieved with about 5 to about 15 mol % ceria and up to about 40 mol % hafnia. The preparation of alloys of these compositions are given together with data as to the densities, tetragonal phase content, hardness and fracture toughness. The alloys are useful in preparing zirconia bodies as well as reinforcing ceramic composites.

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