Processing contributions to microcrack formation in ZTA composites. [Zirconia-Toughened Alumina]

Conference · Mon Oct 01 04:00:00 EDT 1990 · Ceramic Engineering and Science Proceedings; (USA)

OSTI ID:6152183

Konsztowicz, K J; Whiteway, S G

Zirconia/alumina composites, in which the 3Y-PSZ content was varied between 5 and 30 vol pct, were prepared from dense (50 vot pct solids) aqueous suspensions by colloidal filtration. A systematic SEM study of the dispersion of particles showed that zirconia provoked the flocculation of powder mixtures. The extent of heteroflocculation appeared to depend upon the amount of zirconia added, and correlated with the properties of dense suspensions (electrophoretic mobility, viscosity, casting constant) as well as with the microstructure and mechanical properties of consolidated bodies. SEM observation of fracture surfaces of green samples revealed the presence of cracklike voids separating the grain clusters. When cast samples were isostatically pressed, a step which should serve to remove the cracklike defects, their mechanical properties changed significantly. 51 refs.

• OSTI ID: 6152183
• Report Number(s): CONF-900160--
• Conference Information: Journal Name: Ceramic Engineering and Science Proceedings; (USA) Journal Volume: 11
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CERAMICS
CHALCOGENIDES
COMPARATIVE EVALUATIONS
COMPOSITE MATERIALS
CRACKS
MATERIALS
MATRIX MATERIALS
MECHANICAL PROPERTIES
METALLURGY
OXIDES
OXYGEN COMPOUNDS
POWDER METALLURGY
PROCESSING
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES