Densification of Submicron YSZ (Yttria-Stabilized Zirconia) Powders with Alumina and Borate Additives.
Technical rept. no. 9 (Final), 1 Dec 83-30 Nov 84,
ILLINOIS UNIV AT URBANA DEPT OF CERAMIC ENGINEERING
Pagination or Media Count:
Precipitated yttria 8.0 wt stabilized zirconia powders YSZ were sintered in the range 1150-1350 using Al203 and B203 as flux additions. A 21 Al203B203 additive mixture at approximately 2 vol concentration, gave significant densification when sintered at 1200 Cl1 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 B203 and Al203. Excess Al203 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.
- Ceramics, Refractories and Glass
- Fabrication Metallurgy