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Sintering of Ceria‐Doped Tetragonal Zirconia Crystallized in Organic Solvents, Water, and Air
Author(s) -
Sato Tsugio,
Dosaka Kenji,
Yoshioka Toshiaki,
Okuwaki Akitsugu,
Torii Kazuo,
Onodera Yoshiro
Publication year - 1992
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.1151-2916.1992.tb07841.x
Subject(s) - calcination , sintering , coprecipitation , agglomerate , materials science , crystallization , chemical engineering , amorphous solid , methanol , tetragonal crystal system , cubic zirconia , doping , inorganic chemistry , mineralogy , ceramic , chemistry , metallurgy , organic chemistry , crystal structure , catalysis , composite material , optoelectronics , engineering
Amorphous CeO 2 –ZrO 2 gels were prepared by coprecipitation in ammonia solutions. The onset of crystallization of the gels, from calcining in air, was 420°C, while 200° to 250°C in the presence of water and organic solvents such as methanol and ethanol. The sintering behaviors of CeO 2 –ZrO 2 powders were sensitive to the crystallizing conditions, since hard agglomerates formed when the precipitated gels were crystallized by normal calcination in air, whereas soft agglomerates formed when they were crystallized in water or organic solvents. CeO 2 –ZrO 2 powders crystallized in methanol and water at 250°C were sintered to full theoretical density at 1150° and 1400°C, respectively, whereas that crystallized by calcination in air at 450°C was sintered to only 95.2% of theoretical density, even at 1500°C.