Mechanical properties of hot isostatically pressed zirconia-toughened alumina ceramics prepared from coprecipitated powders

Journal Article · Fri Oct 01 04:00:00 EDT 1993 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1993.tb04000.x· OSTI ID:5851670

Matsumoto, Yosuke; Hirota, Ken; Yamaguchi, Osamu ^[1]; Inamura, Suguru; Miyamoto, Hiroki ^[2]; Shiokawa, Nobuaki; Tsuji, Kazuhiro ^[3]

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1. Doshisha Univ., Kyoto (Japan). Dept. of Applied Chemistry
2. Osaka Perfectural Institute of Industrial Technology, (Japan)
3. Osaka Cement Company, Ltd., (Japan)

Amorphous Al[sub 2]O[sub 3]-ZrO[sub 2] composite powders with 5--30 mol% ZrO[sub 2] have been prepared by adding aqueous ammonia to the mixed solutions of aqueous aluminum sulfate and zirconium alkoxide containing 2-propanol. Simultaneous crystallization of [gamma]-Al[sub 2]O[sub 3] and t-ZrO[sub 2] occurs at 870--980 C. The [gamma]-Al[sub 2]O[sub 3] transforms to [alpha]-Al[sub 2]O[sub 3] at 1160--1220 C. Hot isostatic pressing has been performed for 1 h at 1400 C under 196 MPa using [alpha]-Al[sub 2]O[sub 3]-t-ZrO[sub 2] composite powders. Dense ZrO[sub 2]-toughened Al[sub 2]O[sub 3] (ZTA) ceramics with homogeneous-dispersed ZrO[sub 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.

• OSTI ID: 5851670
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 76:10; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201 -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CERAMICS
CHALCOGENIDES
CRYSTALLIZATION
FABRICATION
HOT PRESSING
MATERIALS WORKING
MECHANICAL PROPERTIES
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PRESSING
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES