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

Journal Article · Fri Oct 01 00:00:00 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), Vol. 76:10; ISSN 0002-7820
• Country of Publication: United States
• Language: English

Related Subjects

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