Improvements in the production of Yb:YAG transparent ceramic materials: Spray drying optimisation

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• 作者：Marina Serantoni ; ^{marina.serantoni@tozziholding.com} ; Andreana Piancastelli ; Anna Luisa Costa ; Laura Esposito ; ^{laura.esposito@istec.cnr.it}
• 关键词：Transparent ceramic materials ; Yb ; YAG ; Spray drying ; Nanopowders
• 刊名：Optical Materials
• 出版年：2012
• 期刊代码：81_09253467
• 类别：ch
• 出版时间：April, 2012
• 卷：34
• 期：6
• 页码：995-1001
• 文件大小：1517 K

摘要

Spray drying parameters have been optimized for the preparation of granulated stoichiometric mixture of oxides. These oxides are used in the production of Yb:YAG laser grade ceramic materials by reactive sintering. The selected compositions were Yb_0.294Y_2.706Al₅O₁₂ and Yb_0.03Y_2.97Al₅O₁₂, i.e. YAG doped with 9.8 and 1.0 at%of Yb with respect to the overall Y + Yb amount. The influence of solid content, drying medium flux, temperature and aspiration rate of the spray drying process on the transparency of the sintered materials has been evaluated. Sintering was conducted under high vacuum and clean atmosphere in the temperature range of 1650-1735 掳C and with a soaking time of 16 h. SEM analysis of the microstructure of granulated powders and sintered materials, as well as the transmittance measurement, were used as tools to guide the selection of the best spray drying parameters.