Abstract
Grain growth and densification is described during pressureless sintering of nanocrystalline tetragonal zirconia compacts, doped with various amounts of yttria and/or ceria. All powders have a crystalline size of 8 nm and show an identical aggregate and agglomerate structure. During non-isothermal sintering up to 1050°C no significant difference in grain growth and densification is observed. Isothermal sintering for 6 hours at 1050°C of yttria doped tetragonal zirconia results in a dense ceramic with a grain size of 60 nm. At temperatures ≥ 1050°C ceria doped zirconia shows a stronger grain growth and a lower densification rate if compared with yttria doped zirconia. The effect of dopant on grain growth at higher temperatures is explained in terms of a difference in segregation behaviour of the solute atoms and consequently a difference in grain boundary migration due to 'drag control'.
| Original language | English |
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| Title of host publication | Structural Ceramics Processing, Microstucture and Properties |
| Subtitle of host publication | proceedings of the 11th Risø International Symposium on Metallurgy and Materials Science, 3-7 September 1990 |
| Editors | J.J. Bentzen |
| Place of Publication | Roskilde, Denmark |
| Publisher | Risø National Laboratory |
| Pages | 523-528 |
| Number of pages | 6 |
| ISBN (Print) | 8755016626 |
| Publication status | Published - 1990 |
| Event | 11th Risø International Symposium on Metallurgy and Materials Science 1990 - Roskilde, Denmark Duration: 3 Sept 1990 → 7 Sept 1990 Conference number: 11 |
Publication series
| Name | Proceedings of the Risø International Symposium on Metallurgy and Materials Science |
|---|---|
| Publisher | Risø National Laboratory |
| Volume | 11 |
| ISSN (Print) | 0108-8599 |
Conference
| Conference | 11th Risø International Symposium on Metallurgy and Materials Science 1990 |
|---|---|
| Country/Territory | Denmark |
| City | Roskilde |
| Period | 3/09/90 → 7/09/90 |