Synthesis of CaB₆ powders via mechanochemical reaction of Ca/B₂O₃ blends

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• 作者：Ö ; zge Balc谋 ; ^{ozgebalci1@yahoo.com} ; Duygu A臒ao臒ullar谋 ^{bozkurtdu@itu.edu.tr} ; 陌smail Duman ^{iduman@itu.edu.tr} ; M. L&uuml ; tfi Ö ; ve&ccedil ; o臒lu ^{ovecoglu@itu.edu.tr}
• 关键词：Mechanochemical processing ; High energy ball milling ; HCl leaching ; Calcium hexaboride ; Boron oxide ; Calcium
• 刊名：Powder Technology
• 出版年：2012
• 期刊代码：144_00325910
• 类别：et
• 出版时间：July, 2012
• 卷：225
• 期：Complete
• 页码：136-142
• 文件大小：1112 K

摘要

The synthesis of CaB₆ powders by mechanochemical processing was investigated in the present study. The synthesis was carried out using stoichiometric amounts of Ca/B₂O₃ powder blends as low cost raw materials. Milling was performed at room temperature in a high energy ball-mill using hardened steel vial and balls with a constant ball-to-powder weight ratio (10:1). The effect of milling duration on the production efficiency of CaB₆ powders was investigated. Milled powders were leached by different HCl concentrations under the effect of ultrasonic stirring. The final product was obtained after repeated centrifuging, decanting, washing and drying treatments. Phase and microstructural characterization investigations of the milled and leached powders were carried out by X-ray Diffractometry (XRD), Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS) whereas supernatant liquid was characterized by Atomic Absorption Spectrometry (AAS). The best results for the preparation of CaB₆ powders were obtained from the 6 h milled and repeated leached (2 and 0.5 M HCl solution) powders.