Comparison among different sintering routes for preparing alumina-YAG nanocomposites |
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| Affiliation: | 1. Mechanical & Materials Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588, USA;2. Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, Lincoln, NE 68588, USA;3. Center for Materials Research, Washington State University, Pullman, WA 99164, USA;1. School of Materials Science and Engineering, South China University of Technology, Guangzhou, China;2. National Engineering Laboratory for Modern Materials Surface Engineering Technology, Guangzhou Research Institute of Non-ferrous Metals, Guangzhou, China;3. Department of Metallurgy and Materials Engineering, Katholieke Universiteit Leuven, Leuven, Belgium |
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| Abstract: | Al2O3-YAG (50 vol.%) nanocomposite powders were prepared by wet-chemical synthesis and characterized by DTA-TG, XRD and TEM analyses. Amorphous powders were pre-heated at different temperatures (namely 600 °C, 800 °C, 900 °C and 1215 °C) and the influence of this thermal treatment on sintering behavior, final microstructure and density was investigated. The best performing sample was that pre-calcined at 900 °C, which yields dense bodies with a micronic/slightly sub-micronic microstructure after sintering at 1600 °C. A pre-treatment step to induce controlled crystallisation of the amorphous powder as well as a fast sintering procedure for green compacts, were also performed as a comparison.Finally, the previously stated thermal pre-treatment of the amorphous product was coupled to an extensive mechanical activation performed by wet planetary/ball milling. This procedure was highly effective in lowering the densification temperature, so that fully dense Al2O3-YAG composites, with a mean grain size smaller than 200 nm, were obtained by sintering in the temperature range 1370–1420 °C. |
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