Preparation of yttria nanopowders for use in transparent ceramics by dry ball-milling technique

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• 作者：Mehdi ahsanzadeh-Vadeqani^a ; ^{ahsanzadeh@mut-es.ac.ir} ; Reza Shoja Razavi^a ; ^{shoja_r@mut-es.ac.ir} ; Masoud Barekat^a ; Gholam Hossein Borhani^a ; Ajay Kumar Mishra^b
• 关键词：Yttria ; Dry ball-milling ; SPS ; Transmittance
• 刊名：Journal of the European Ceramic Society
• 出版年：2017
• 出版时间：May 2017
• 年：2017
• 卷：37
• 期：5
• 页码：2169-2177
• 全文大小：3892 K
• 卷排序：37

文摘

To evaluate the effectiveness of dry ball-milling, yttria powders were ball-milled, and the optimal sample was spark plasma sintered to fabricated transparent yttria ceramics. The characterization of the powders and pellets were analyzed using XRD, FESEM, UV/VIS/NIR and FTIR spectrometer throughout the whole experimental process. The results indicated that ball-milling can significantly decrease yttria particle size and enhance the specifice surface area. The best duration is 20 h ball-milling with average particle size and specifice surface area of 64 nm and 20.4 m2/g, respectively. Transparent yttria ceramic was made up of grains in the size range of approximately 0.67 μm and the relative density was 99.8%. The in-line transmittance of the SPS-sintered yttria ceramic (2.5 mm thick) reached 83% in the infrared region, which is very close to the theoretical value of yttria.