Preparation of nanocrystalline yttria-stabilized zirconia
- Institute for Self-Propagating High-Temperature Synthesis, New York State College of Ceramics at Alfred University, Alfred, New York, 14802 (United States)
Nanocrystalline powder with an average crystalline size of 8--12 nm, which was produced by a combustion synthesis process, was used to prepare dense, nanocrystalline articles. Green compacts of high green density were prepared by dry pressing and densified by a fast-firing process. During fast-firing, the dwell temperature significantly affected the final grain size and final density. On the other hand, the ranges of heating rates and dwell times that were used had a much less significant effect on the final density and final grain size. It was determined, however, that a high final density ({gt}99% {rho}{sub th}) and a very fine final average grain size ({lt}200 nm) can be simultaneously achieved under three different firing conditions. The high densification rates are, in part, a result of the minimal coarsening that the particles undergo when the sample is taken rapidly through the temperature regime in which surface diffusion predominates to the temperature regime in which the densification mechanisms of grain boundary and lattice diffusion predominate.
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- FG02-93ER12128
- OSTI ID:
- 46338
- Journal Information:
- Journal of Materials Research, Journal Name: Journal of Materials Research Journal Issue: 3 Vol. 10; ISSN JMREEE; ISSN 0884-2914
- Country of Publication:
- United States
- Language:
- English
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