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Subeutectoid Degradation of Yttria‐Stabilized Tetragonal Zirconia Polycrystal and Ceria‐Doped Yttria‐Stabilized Tetragonal Zirconia Polycrystal Ceramics
Author(s) -
Hernandez María T.,
Jurado José R.,
Duran Pedro,
Fierro José L. G.
Publication year - 1991
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.1151-2916.1991.tb04094.x
Subject(s) - tetragonal crystal system , materials science , monoclinic crystal system , cubic zirconia , yttria stabilized zirconia , ceramic , x ray photoelectron spectroscopy , doping , mineralogy , phase (matter) , chemical engineering , composite material , crystallography , crystal structure , chemistry , optoelectronics , organic chemistry , engineering
Yttria‐doped tetragonal zirconia containing 2 and 3 mol% Y 2 O 3 (Y‐TZP), and CeO 2 ‐doped Y‐TZP containing 0 to 12 mol% CeO 2 were sintered at 1350°C in a tetragonal single‐phase field for 2 h in air, and the degradation behavior at low temperature in air and in hot water was observed. X‐ray photoelectron spectroscopy studies on the surface of hydrothermally treated samples show evidence for the formation of a YO(OH) species, along with the simultaneous formation of purely tetragonal zirconia nuclei that retain their coherence in the Y‐TZP matrix. Above a critical size, the tetragonal nuclei spontaneously transform to a monoclinic structure, giving rise to macro‐ and microcracking. The strong tetragonal grains degrade to produce a spalling phenomenon that facilitates further degradation. Y‐TZP ceramics alloyed with adequate amounts of CeO 2 show no tetragonal‐to‐monoclinic transformation after hydrothermal treatment.