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- Title
Zirconium Aluminum Carbides: New Precursors for Synthesizing ZrO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub> Composites.
- Authors
Ling-Feng He; Yi-Wang Bao; Yan-Chun Zhou
- Abstract
ZrO2–Al2O3 nanocrystalline powders have been synthesized by oxidizing ternary Zr2Al3C4 powders. The simultaneous oxidation of Al and Zr in Zr2Al3C4 results in homogeneous mixture of ZrO2 and Al2O3 at nanoscale. Bulk nano- and submicro-composites were prepared by hot-pressing as-oxidized powders at 1100°–1500°C. The composition and microstructure evolution during sintering was investigated by XRD, Raman spectroscopy, SEM, and TEM. The crystallite size of ZrO2 in the composites increased from 7.5 nm for as-oxidized powders to about 0.5 μm at 1500°C, while the tetragonal polymorph gradually converted to monolithic one with increasing crystallite size. The Al2O3 in the composites transformed from an amorphous phase in as oxidized powders to θ phase at 1100°C and α phase at higher temperatures. The hardness of the composite increased from 2.0 GPa at 1100°C to 13.5 GPa at 1400°C due to the increase of density.
- Subjects
ZIRCONIUM; CARBIDES; RAMAN spectroscopy; SINTERING; NANOCRYSTALS; MICROSTRUCTURE; TEMPERATURE; DENSITY; ISOSTATIC pressing
- Publication
Journal of the American Ceramic Society, 2009, Vol 92, Issue 11, p2751
- ISSN
0002-7820
- Publication type
Article
- DOI
10.1111/j.1551-2916.2009.03281.x