Densification of submicron YSZ (yttria-stabilized zirconia) powders with alumina and borate additives. Technical report No. 9 (final), 1 December 1983-30 November 1984

Technical Report · Mon Dec 10 00:00:00 EST 1984

OSTI ID:5495710

Buchanan, R C; Wilson, D M

Precipitated yttria (8.0 wt%)-stabilized zirconia powders (YSZ) were sintered in the range 1150-1350/sup 0/C using Al/sub 2/O/sub 3/ and B/sub 2/O/sub 3/ as flux additions. A (2:1) Al/sub 2/O/sub 3/:B/sub 2/O/sub 3/ additive mixture at approximately 2 vol% concentration, gave significant densification when sintered at 1200 Cl/1 hr. Washing of the powders to remove residual Cl was necessary to achieve high densification below 1300 C. Samples obtained were optically translucent at 1-mm thickness with average grain size 0.2-0.4 micrometer. Mechanical, thermal and electrical properties were not degraded by the flux additions to YSZ. Densification by liquid-phase sintering was determined for both B/sub 2/O/sub 3/ and Al/sub 2/O/sub 3/. Excess Al/sub 2/O/sub 3/ was found to exist as discrete particles in the YSZ matrix. Depletion of yttria from the grain matrix was observed with the flux additions but non-cubic phase transitions were not evident.

• Research Organization: Illinois Univ., Urbana (USA). Dept. of Ceramic Engineering
• OSTI ID: 5495710
• Report Number(s): AD-A-149520/9/XAB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
YTTRIUM OXIDES
ZIRCONIUM OXIDES
SINTERING
ADDITIVES
ALUMINIUM OXIDES
BORON OXIDES
COMPACTING
ELECTRICAL PROPERTIES
GRAIN SIZE
MECHANICAL PROPERTIES
OPTICAL PROPERTIES
POWDERS
ZIRCONIUM
ALUMINIUM COMPOUNDS
BORON COMPOUNDS
CHALCOGENIDES
CRYSTAL STRUCTURE
ELEMENTS
FABRICATION
METALS
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SIZE
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
YTTRIUM COMPOUNDS
ZIRCONIUM COMPOUNDS
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication