Microstructure-mechanical property relationships in hot isostatically pressed alumina and zirconia-toughened alumina

Journal Article · Tue May 01 00:00:00 EDT 1990 · Journal of the American Ceramic Society; (USA)

DOI:https://doi.org/10.1111/j.1151-2916.1990.tb05177.x· OSTI ID:6022080

Shin, D W; Orr, K K ^[1]; Schubert, H ^[2]

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1. Dept. of Inorganic Materials Engineering, Hanyang Univ., Seoul 133 (KR)
2. Max-Planck-Institut fur Metallforschung, Institut fur Werkstoffwissenschaften, D-7000 Stuttgart (DE)

The rates of densification and the mechanical properties of pure Al{sub 2}O{sub 3} and ZrO{sub 2}-toughened Al{sub 2}O{sub 3} (ZTA) have been investigated as a function of the temperatures and time schedules used for hot isostatic pressing (HIP) as a postsintering heat treatment for samples which had already been pressureless sintered in air at 1460{degrees}C for 45 min. ZTA hot isostatically pressed at 1400{degrees}C had a finer grain size and a narrower grain size distribution than ZTA hot isostatically pressed at 1600{degrees}C. At both HIP conditions, the density which could be obtained was almost the maximum theoretical density. The amount of grinding-induced and fracture-induced monoclinic ZrO{sub 2} formed as a result of the tetragonal {r arrow} monoclinic martensitic transformation in ZTA was higher in the samples hot isostatically pressed at 1400{degrees}C. ZTA hot isostatically pressed at 1600{degrees}C and 100 MPa had fewer flaws and higher strengths than ZTA hot isostatically pressed at 1400{degrees}C for the same time, with a gradual improvement in mechanical properties with increasing HIP time at each of these two temperatures.

• OSTI ID: 6022080
• Journal Information: Journal of the American Ceramic Society; (USA), Vol. 73:5; ISSN 0002-7820
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
MICROSTRUCTURE
CRYSTAL DOPING
DENSITY
FLEXURAL STRENGTH
GRAIN SIZE
HOT PRESSING
MARTENSITE
PHASE TRANSFORMATIONS
TEMPERATURE DEPENDENCE
TENSILE PROPERTIES
TETRAGONAL LATTICES
TIME DEPENDENCE
ZIRCONIUM OXIDES
ALLOYS
ALUMINIUM COMPOUNDS
CARBON ADDITIONS
CHALCOGENIDES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
FABRICATION
IRON ALLOYS
MATERIALS WORKING
MECHANICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PRESSING
SIZE
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies
360203 - Ceramics
Cermets
& Refractories- Mechanical Properties
360201 - Ceramics
Cermets
& Refractories- Preparation & Fabrication