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Effect of Ta 2 O 5 , Nb 2 O 5 , and HfO 2 Alloying on the Transformability of Y 2 O 3 ‐Stabilized Tetragonal ZrO 2
Author(s) -
Kim DaeJoon
Publication year - 1990
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1990.tb05100.x
Subject(s) - tetragonal crystal system , materials science , fracture toughness , phase (matter) , oxide , crystal structure , crystallography , solid solution , metallurgy , mineralogy , chemistry , organic chemistry
The addition of Ta 2 O 5 , Nb 2 O 5 , and HfO 2 enhanced the transformability of Y 2 O 3 ‐stabilized tetragonal ZrO 2 polycrystal (Y‐TZP), which was indicated by an increase in phase transformation temperatures and fracture toughness of Y‐TZP. Comparison of the alloying effects of these oxides on the transformability and crystal structure of Y‐TZP suggested that an alloying oxide which increases the c/a axial ratio (tetragonality) of TZP also increases the transformability. Empirical equations to predict the tetragonality are proposed. Calculated tetragonalities showed good agreement with measured values in the systems ZrO 2 ‐Y 2 O 3 ‐Ta 2 O 5 , ‐Nb 2 O 5 , and ‐HfO 2 .