Synthesis and microstructural characterization of α-Al2O3–t-ZrO2 composite powders prepared by combustion technique
| Autor: | S. P. Sen Gupta, P. Chatterjee, Apurba Kanti Deb |
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| Rok vydání: | 2007 |
| Předmět: |
Materials science
Mechanical Engineering Composite number Self-propagating high-temperature synthesis Mineralogy Condensed Matter Physics Ceramic matrix composite Microstructure Tetragonal crystal system symbols.namesake Chemical engineering Mechanics of Materials Phase (matter) symbols General Materials Science Crystallite Raman spectroscopy |
| Zdroj: | Materials Science and Engineering: A. 459:124-131 |
| ISSN: | 0921-5093 |
| Popis: | α-Al 2 O 3 –ZrO 2 composites with various wt. fractions were prepared from metal nitrates by a combustion technique. A detailed study on the phase stability of ZrO 2 in the tetragonal phase at room temperature and near its transformation temperature and its microstructural features in the α-Al 2 O 3 matrix has been conducted using X-ray structural and microstructural refinement, TEM and Raman spectroscopy. It is observed that the tetragonal ZrO 2 is stabilized in an alumina matrix up to a wt. fraction of ∼0.58. The crystallite size (54 nm), obtained from the X-ray diffraction analysis, is in accordance with TEM studies (65 nm). The size value is well above the critical size limit as reported in the literature. It is found that microstrains also play a significant role in the stabilization process. |
| Databáze: | OpenAIRE |
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