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Large-Bulk Solidified Al2O3-ZrO2(Y2O3) Prepared by Self-Pressure Assisting Combustion Synthesis under High Gravity
- Source :
- Advanced Materials Research; December 2010, Vol. 177 Issue: 1 p394-397, 4p
- Publication Year :
- 2010
-
Abstract
- By introducing self-pressure processing into combustion synthesis under high gravity, Al2O3-ZrO2(4Y) eutectic composite ceramics without shrinkage cavities and holes were achieved, and the self-pressure processing also made the macro-crack be controlled and the ceramic densification be promoted evidently. XRD results showed the eutectic ceramics were composed of α-Al2O3, t-ZrO2 and a few m-ZrO2 phases, and the volume fraction of the transformable t-ZrO2 increased with self-pressure force increasing. SEM images showed that with increasing self-pressure force, the rod-shaped eutectic colonies were refined and the volume fraction of the colonies increased. Meanwhile, the irregular ZrO2 crystals around eutectic colonies transformed to be fine t-ZrO2 spherical crystals gradually, and thickness of eutectic colonies decreased. With the changes in microstructures of the ceramics, the mechanical properties of the ceramics were improved greatly.
Details
- Language :
- English
- ISSN :
- 10226680
- Volume :
- 177
- Issue :
- 1
- Database :
- Supplemental Index
- Journal :
- Advanced Materials Research
- Publication Type :
- Periodical
- Accession number :
- ejs22967526
- Full Text :
- https://doi.org/10.4028/www.scientific.net/AMR.177.394