Elaboration and Mechanical Characterization of Al2O3-ZrO2-YAG Ultrafine Composites
| Periodical | Advances in Science and Technology (Volume 62) |
|---|---|
| Main Theme | 12th INTERNATIONAL CERAMICS CONGRESS PART A |
| Edited by | Pietro VINCENZINI and Jean-François BAUMARD |
| Pages | 76-81 |
| DOI | 10.4028/www.scientific.net/AST.62.76 |
| Citation | Paola Palmero et al., 2010, Advances in Science and Technology, 62, 76 |
| Online since | October, 2010 |
| Authors | Paola Palmero, Valentina Naglieri, Giulia Spina, Laura Montanaro |
| Keywords | Al2O3-YAG-ZrO2 Nanocomposite, Microstructure, Sintering, Slip Casting |
| Price | US$ 28,- |
Al2O3-YAG-ZrO2 composites have been produced by surface modification of a commercial nano-crystalline alumina powder with inorganic precursors of the desired second phases. The doped powders were calcined at various temperatures and for different times: as a function of the thermal treatment, zirconia directly crystallized on the alumina surface, while YAG phase was yielded by solid state reaction among an amorphous yttrium-rich precursor and alumina powder. Several compositions, with increasing second phases volume fractions, were investigated, precisely, Alumina-5vol.%YAG-5vol.%ZrO2, Alumina-20vol.%YAG-20vol.%ZrO2 and Alumina- 33vol.%YAG-33vol.%ZrO. Slip cast bodies were produced by aqueous suspensions of calcined and well-dispersed powders; free-sintering performed at 1500°C for 3 h allowed to reach full densification. The role of the second phases amount on the microstructural features and on some mechanical data preliminary evaluated was established.
