High toughness ceramic alloys

Details High toughness ceramic alloys High toughness ceramic alloys

1990-06-12

1991-04-16

Group, Karl

Compositions: ceramic

Ceramic compositions

Refractory

501104, 501105, 501 95, C04B 3548

Patent

active

050082213

ABSTRACT:
This invention is directed to the production of ceramic alloys consisting essentially of partially stabilized ZrO.sub.2 and/or ZrO.sub.2 -HfO.sub.2 solid solution and/or HfO.sub.2 exhibiting high toughness through the inclusion of about 0.5-8 mole %, as expressed on the oxide basis, of YNbO.sub.4 and/or YTaO.sub.4 and/or MNbO.sub.4 and/or MTaO.sub.4, wherein M represents Mg.sup.+2, Ca.sup.+2, Sc.sup.+3 and/or a rare earth metal ion selected from the group of La.sup.+3, Ce.sup.+4, Ce.sup.+3, Pr.sup.+3, Nd.sup.+3, Sm.sup.+3, Eu.sup.+3, Gd.sup.+3, Tb.sup.+3, Dy.sup.+3, Ho.sup.+3, Er.sup.+3, Tm.sup.+3, Yb.sup.+3, and Lu.sup.+3 substituted for Y, and the use of at least 5 volume percent of such ceramic alloys to toughen hard refractory ceramics.

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patent: 4770673 (1988-09-01), Ketcham et al.
patent: 4886768 (1989-12-01), Tien
Stevens "An Introduction to Zirconia", pp. 10-11, Jun. 1983.

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