Mechanism of grain orientation during hot-pressing of bismuth titanate
- Keio Univ., Yokohama (Japan). Faculty of Science and Technology
Grain-oriented Bi/sub 4/Ti/sub 3/O/sub 12/ ceramics have been prepared by hot-pressing. Platelike grains align during hot-pressing; the long-axis direction perpendicular to the crystal c axis is oriented perpendicular to the pressing direction. The authors describe the effects of hot-pressing conditions such as temperature, pressure, time, and type of filler on the density, orientation degree, and deformation of hot-pressed compacts. Sharp increases in the density, deformation, and grain orientation occurred during the early state; the density decreased, and the latter two increased on prolonged hot-pressing. The grain orientation is closely related to the deformation in the radial direction. The grain-orientation mechanism is discussed referring to mechanisms proposed for high-temperature deformation in ceramics. The compact is deformed by two processes: one accompanies grain orientation, and the other does not. Grain-boundary sliding is proposed for the former process.
- OSTI ID:
- 5213407
- Journal Information:
- Journal of the American Ceramic Society; (USA), Journal Name: Journal of the American Ceramic Society; (USA) Vol. 72:1; ISSN JACTA; ISSN 0002-7820
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360103 -- Metals & Alloys-- Mechanical Properties
360201 -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
BISMUTH COMPOUNDS
BISMUTH OXIDES
CHALCOGENIDES
CRYSTAL STRUCTURE
DEFORMATION
DENSITY
FABRICATION
GRAIN BOUNDARIES
GRAIN ORIENTATION
HIGH TEMPERATURE
HOT PRESSING
MATERIALS WORKING
MICROSTRUCTURE
ORIENTATION
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PRESSING
TITANATES
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS