Preparation of a ZrO{sub 2}{endash}Al{sub 2}O{sub 3} nanocomposite by high-pressure sintering of spray-pyrolyzed powders
Journal Article
·
· Journal of Materials Research
- Department of Chemical Engineering and Materials Science, University of California, One Shields Avenue, Davis, California 95616 (United States)
- Department of Metallurgy, Indian Institute of Science, Bangalore 560 012 (India)
- Department of Geology, University of California, One Shields Avenue, Davis, California 95616 (United States)
ZrO{sub 2}{endash}Al{sub 2}O{sub 3} powders were synthesized by spray pyrolysis. These powders were sintered at 1 GPa in the temperature range of 700{endash}1100&hthinsp;{degree}C. The microstructural evolution and densification are reported in this paper. The application of 1 GPa pressure lowers the crystallization temperature from {approximately}850 to {lt}700&hthinsp;{degree}C. Similarly, the transformation temperature under 1 GPa pressure for {gamma}{r_arrow}{alpha}{endash}Al{sub 2}O{sub 3} reduces from {approximately}1100 to 700{endash}800&hthinsp;{degree}C range and that for t{r_arrow}m ZrO{sub 2} reduces from {approximately}1050 to 700{endash}800&hthinsp;{degree}C range. It was possible to obtain highly dense nanocrystalline ZrO{sub 2}{endash}Al{sub 2}O{sub 3} composite at temperatures as low as 700&hthinsp;{degree}C. The effect of high pressure on nucleation and transformation of phases is discussed. {copyright} {ital 1999 Materials Research Society.}
- OSTI ID:
- 341172
- Journal Information:
- Journal of Materials Research, Journal Name: Journal of Materials Research Journal Issue: 3 Vol. 14; ISSN JMREEE; ISSN 0884-2914
- Country of Publication:
- United States
- Language:
- English
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