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Mechanical Properties of Hot Isostatically Pressed Zirconia‐Toughened Alumina Ceramics Prepared from Coprecipitated Powders
Author(s) -
Matsumoto Yosuke,
Hirota Ken,
Yamaguchi Osamu,
Inamura Suguru,
Miyamoto Hiroki,
Shiokawa Nobuaki,
Tsuji Kazuhiro
Publication year - 1993
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.1151-2916.1993.tb04000.x
Subject(s) - materials science , hot isostatic pressing , fracture toughness , ceramic , composite number , microstructure , aqueous solution , composite material , cubic zirconia , alkoxide , zirconium , amorphous solid , crystallization , hot pressing , solid solution , chemical engineering , metallurgy , crystallography , chemistry , catalysis , biochemistry , engineering
Amorphous Al 2 O 3 –ZrO 2 composite powders with 5–30 mol% ZrO 2 have been prepared by adding aqueous ammonia to the mixed solution of aqueous aluminum sulfate and zirconium alkoxide containing 2‐propanol. Simultaneous crystallization of γ‐Al 2 O 3 and t ‐ZrO 2 occurs at 870°–980°C. The γ‐Al 2 O 3 transforms to α‐Al 2 O 3 at 1160°–1220°C. Hot isostatic pressing has been performed for 1 h at 1400°C under 196 MPa using α‐Al 2 O 3 – t ‐ZrO 2 composite powders. Dense ZrO 2 ‐toughened Al 2 O 3 (ZTA) ceramics with homogeneous‐dispersed ZrO 2 particles show excellent mechanical properties. The toughening mechanism is discussed. The microstructures and t / m ratios of ZTA are examined, with emphasis on the relation between strength and fracture toughness.