Sintering of Mixtures of Seeded Boehmite and Ultrafine α-Alumina |
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Authors: | Seongtae Kwon Gary L Messing |
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Affiliation: | Department of Materials Science and Engineering and The Particulate Materials Center, Pennsylvania State University, University Park, Pennsylvania 16802 |
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Abstract: | α-Alumina was fabricated by dry pressing mixtures of seeded boehmite and fine α-alumina (i.e., 0.2 and 0.3 μm diameter) to reduce the large shrinkage of boehmite-derived α-alumina. The maximum green density was obtained with mixtures containing ~70%α-alumina for both alumina powders. The ~15% linear shrinkage and microstructures of these samples were comparable to 100% alumina powder samples. Samples with 0.2 μm alumina sintered to densities >95% at 1300°C whereas 1400°C was needed for samples with 0.3 μm alumina. These results indicate that boehmite can be used as a substitute for relatively expensive ultrafine α-alumina powders. |
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Keywords: | sinter/sintering boehmite alumina |
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