Effect of yttria on crystallization and microstructure of an alumina–YAG fiber prepared by aqueous sol–gel process
| Autor: | M. Shojaie-Bahaabad, Rahim Naghizadeh, Ehsan Taheri-Nassaj |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
Materials science
Process Chemistry and Technology Composite number chemistry.chemical_element Yttrium Microstructure Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention chemistry law visual_art Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Fiber Ceramic Composite material Crystallization Yttria-stabilized zirconia Sol-gel |
| Zdroj: | Ceramics International. 35:391-396 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2007.11.010 |
| Popis: | Continuous fiber development is needed for high performance and high temperature composites. Various methods have been used to make ceramic fibers. In this research, composite fibers (yttrium aluminum garnet (YAG)/Al2O3) were prepared by a sol–gel method using aqueous solution. They were synthesized from aluminum salt, aluminum metal, yttrium oxide and water used as solvent. Transparent gel fibers were obtained by immersing a thin wire into the viscous sol, then pulling it out by hand. The obtained fibers contained very fine grains with diameter ranging from 10 to 80 μm after heat treatment. When yttria content was increased, the crystallization of YAG shifted to a lower temperature, whereas the transformation temperature to α-Al2O3 shifted to a higher temperature. Nevertheless, the fibers with different amounts of yttria contained alumina and YAG after heat treatment at 1400 °C. The composite fibers had vermicular structure and were denser than alumina fibers. The yttria percent concerning the limits of this study (≤10 wt%) effected on fiber diameter. As the yttria content was increased, the fiber diameter increased, whereas grain size and densification of the composite fibers decreased. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect