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Strength and Phase Stability of Yttria‐Ceria‐Doped Tetragonal Zirconia/Alumina Composites Sintered and Hot Isostatically Pressed in Argon–Oxygen Gas Atmosphere
Author(s) -
Hirano Masanori,
Inada Hiroshi
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.tb04067.x
Subject(s) - materials science , hot isostatic pressing , yttria stabilized zirconia , cubic zirconia , tetragonal crystal system , phase (matter) , composite material , hot pressing , hydrothermal circulation , doping , flexural strength , sintering , chemical engineering , ceramic , chemistry , organic chemistry , engineering , optoelectronics
Yttria‐ceria‐doped tetragonal zirconia (Y,Ce)‐TZP)/alumina (Al 2 O 3 ) composites were fabricated by hot isostatic pressing at 1400° to 1450°C and 196 MPa in an Ar–O 2 atmosphere using the fine powders prepared by hydrolysis of ZrOCl 2 solution. The composites consisting of 25 wt% Al 2 O 3 and tetragonal zirconia with compositions 4 mol% YO 1.5 –4 mol% CeO 2 –ZrO 2 and 2.5 mol% YO 1.5 –5.5 mol% CeO 2 –ZrO 2 exhibited mean fracture strength as high as 2000 MPa and were resistant to phase transformation under saturated water vapor pressure at 180°C (1 MPa). Postsintering hot isostatic pressing of (4Y, 4Ce)‐TZP/Al 2 O 3 and (2.5Y, 5.5Ce)‐TZP/Al 2 O 3 composites was useful to enhance the phase stability under hydrothermal conditions and strength.