Control of grain growth using intergranular silicate phases in cubic yttria stabilized zirconia
- Univ. of California, Irvine, CA (United States). Dept. of Chemical, Biochemical Engineering and Materials Science
- Los Alamos National Lab., NM (United States). Center for Materials Science
Grain growth kinetics for 8 mol% yttria stabilized cubic zirconia (8Y-CSZ) were investigated. Optimal process parameters required to achieve a small grain size and full density for cubic 8Y-CSZ included a rapid heating rate (100 C/min) and hot isostatic pressing. Grain growth rates could also be controlled by the deliberate addition of 1 wt% of intergranular phases of borosilicate, barium silicate, and lithium aluminum silicate glasses. Lithium aluminum silicate, the intergranular phase with the highest solubility for yttria and zirconia, enhanced grain growth compared to control samples without grain boundary phases. The borosilicate intergranular phase, with the lowest solubility for yttria and zirconia, was the most effective in suppressing grain growth. Activation energies for grain growth were in the range of 400 kJ/mol, and the grain growth exponent ranged from 2 for lithium aluminum silicate containing samples, to 3 for pure samples, to 4 for barium silicate and borosilicate containing samples.
- OSTI ID:
- 644307
- Report Number(s):
- CONF-9704224--
- Journal Information:
- Acta Materialia, Journal Name: Acta Materialia Journal Issue: 11 Vol. 46; ISSN 1359-6454; ISSN ACMAFD
- Country of Publication:
- United States
- Language:
- English
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