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

Journal Article · Tue May 01 04:00:00 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), Journal Name: Journal of the American Ceramic Society; (USA) Vol. 73:5; ISSN 0002-7820; ISSN JACTA
• 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
ALLOYS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBON ADDITIONS
CHALCOGENIDES
CRYSTAL DOPING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DENSITY
FABRICATION
FLEXURAL STRENGTH
GRAIN SIZE
HOT PRESSING
IRON ALLOYS
MARTENSITE
MATERIALS WORKING
MECHANICAL PROPERTIES
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
PRESSING
SIZE
TEMPERATURE DEPENDENCE
TENSILE PROPERTIES
TETRAGONAL LATTICES
TIME DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES