Seeding with γ-Alumina for Transformation and Microstructure Control in Boehmite-Derived α-Alumina |
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| Authors: | James L. McArdle Gary L. Messing |
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| Affiliation: | Department of Materials Science and Engineering, The Pennsylvania Stare University, University Park, Pennsylvania 16802 |
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| Abstract: | The dehydration, transformation, and densification of boehmite (γ-AlOOH) are enhanced by addition of γ-Al2O3 seed particles. α-Al2O3 microstructures with uniform 1- to 2-μm grain size and sintered densities 98% of theoretical are achieved at 1300°C Thermal analysis shows that γ-Al2O3 seed particles transform to α-Al2O3 before the matrix, thus controllably nucleating the transformation of θ-AI2O3 to α-Al2O3. |
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