Transparent polycrystalline alumina obtained by SPS: Green bodies processing effect

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• 作者：Lucile Lallemant^a ; ^b ; ^{lucile.lallemant@insa-lyon.fr} ; Gilbert Fantozzi^a ; ^b ; Vincent Garnier^a ; ^b ; Guillaume Bonnefont^a ; ^b
• 关键词：Al2O3 ; Shaping ; Porosity ; Spark plasma sintering ; Optical properties
• 刊名：Journal of the European Ceramic Society
• 出版年：2012
• 期刊代码：53_09552219
• 类别：ms
• 出版时间：August, 2012
• 卷：32
• 期：11
• 页码：2909-2915
• 文件大小：1038 K

摘要

Starting from a commercial slurry of high purity 伪-Al₂O₃, freeze-dried powders, cast, filter-pressed or cold isostatically pressed samples were produced. Resulting powders or green bodies showing different particles packing were densified by spark plasma sintering (SPS) to obtain transparent polycrystalline 伪-Al₂O₃. Microstructure and real in-line transmittance (RIT) after SPS were dependent on the particles packing quality. Avoiding large agglomerates, narrowing the pore size distribution, reducing the most-frequent pore size (D_mode) and avoiding macroscopic heterogeneities within the green bodies enabled high RIT values to be achieved in the visible and near-infrared spectrum. However, a limit was achieved in the preparation of green bodies for which reducing the D_mode had no more influence on the optical behaviour of samples sintered by SPS. Finally, pure 伪-Al₂O₃ samples presenting a high RIT_640 nm value of 53%were produced from all the green bodies obtained by the following techniques: filter-pressing, slip casting and cold isostatic pressing.