초록 ▼

This invention is directed to the production of ceramic alloys consisting essentially of partially stabilized ZrO2 and/or ZrO2-HfO2 solid solution and/or HfO2 exhibiting high toughness through the inclusion of about 0.5-8 mole %, as expressed on the oxide basis, of YNbO4 and/or YTaO4 and/or MNbO4 an

This invention is directed to the production of ceramic alloys consisting essentially of partially stabilized ZrO2 and/or ZrO2-HfO2 solid solution and/or HfO2 exhibiting high toughness through the inclusion of about 0.5-8 mole %, as expressed on the oxide basis, of YNbO4 and/or YTaO4 and/or MNbO4 and/or MTaO4, wherein M represents Mg+2, Ca+2, Sc+3 and/or a rare earth metal ion selected from the group of La+3, Ce+4, Ce+3, Pr+3, Nd+3, Sm+3, Eu+3, Gd+3, Tb+3, Dy+3, Ho+3, Er+3, Tm+3, Yb+3, and Lu+3 substituted for Y, and the use of at least 5 volume percent of such ceramic alloys to toughen hard refractory ceramics.

대표청구항 ▼

A ceramic alloy consisting essentially of at least one member selected from the group consisting of partially stabilized ZrO2, partially stabilized ZrO2-HfO2 solid solution, and partially stabilized HfO2 exhibiting high toughness through the inclusion of 0.5-5 mole %, as expressed on the oxide basis

A ceramic alloy consisting essentially of at least one member selected from the group consisting of partially stabilized ZrO2, partially stabilized ZrO2-HfO2 solid solution, and partially stabilized HfO2 exhibiting high toughness through the inclusion of 0.5-5 mole %, as expressed on the oxide basis, of a toughening agent selected from the group of YNbO4 and/or YTaO4 and/or MNbO4 and/or MTaO4, wherein M represents Mg+2, Ca+2, Sc+2, and/or a rare earth metal selected from the group consisting of La+3, Ce+4, Ce+3, Pr+3, Nd+3, Sm+3, Eu+3, Gd+3, Tb+3, Dy+3, Ho+3, Er+3, Tm+3, Yb+3, and Lu+3 which are substituted for Y+3, one +3 cation being substituted for one Y+3 cation, three +2 cations being substituted for two Y+3 cations, three +4 cations for four Y+3 cations, in which said partial stabilization is produced through the inclusion of 1.1-4.5 mole % stabilizer where the amount of toughening agent is between 0.5-4.4 mole % and of 0.6-4.5 mole % stabilizer where the amount of toughening agent is between 4.4-5 mole %, the microstructure of said alloy consisting predominantly of crystals having a tetragonal structure.