Freeze drying vs microwave drying-methods for synthesis of sinteractive thoria powders

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• 作者：D. Annie^a ; V. Chandramouli^a ; S. Anthonysamy^a ; ^{sas@igcar.gov.in} ; Chanchal Ghosh^b ; R. Divakar^b
• 关键词：Freeze drying ; Microwave drying ; Sintering ; Precipitation
• 刊名：Journal of Nuclear Materials
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：484
• 期：Complete
• 页码：51-58
• 全文大小：1414 K
• 卷排序：484

文摘

Thoria powders were synthesized by oxalate precipitation from an aqueous solution of the nitrate. The filtered precipitates were freeze dried or microwave dried before being calcined at 1073 K. The thoria powders obtained were characterized for crystallite size, specific surface area, bulk density, particle size distribution and residual carbon. Microstructure of the product was studied using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Sinterability of the synthesized powders was studied by measuring the density of the sintered compacts. Powders that can be consolidated and sintered to densities ∼96% theoretical density (TD) at 1773 K were obtained.