ISSN:
1862-0760
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract Alumina-zirconia eutectic composites are directionally solidified using the Stepanov (EFG) technique. The 58.6 m/o Al2O3+39.2 m/o ZrO2+2.2 m/o Y2O3 composites contain a cubic 5.6 Y-FSZ phase and the 59 m/o Al2O3+40 m/o ZrO2+1 m/o Y2O3 composites contain a tetragonal 2.5 Y-PSZ phase with a small amount of monoclinic zirconia. Relationships between nominal composition, preparation conditions, phase composition, microstructure, and physical properties (fast ionic conductivity, dielectric response, microhardness, cracking process) are reported. It is shown that the properties depend not only on well defined parameters (nominal and phase compositions, growth rate, annealing etc.) but also on a spurious contamination of the melt which results in growth irregularities and a porosity of the composites.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02375956
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