Investigation of various reactions for the direct synthesis of TiCr₂ intermetallic compound from the TiO₂-Cr₂O₃-Ca system

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• 作者：O. Bayat ; ^{obayat@iust.ac.ir} ; A.R. Khavandi ^{khavandi@iust.ac.ir} ; R. Ghasemzadeh ^{rhzadeh@iust.ac.ir}
• 关键词：Thermal analysis ; Intermetallics ; Hydrogen absorbing materials ; X-ray diffraction
• 刊名：Journal of Alloys and Compounds
• 出版年：2012
• 期刊代码：45_09258388
• 类别：ms
• 出版时间：15 April, 2012
• 卷：520
• 期：Complete
• 页码：164-169
• 文件大小：1002 K

摘要

A new processing route was applied for the synthesis of TiCr₂ intermetallic powder directly by the Calciothermic co-reduction of TiO₂-Cr₂O₃ oxides. Differential thermal analysis (DTA) and X-ray diffraction (XRD) were used to determine the various reactions. According to DTA results heating the mixture up to about 675 掳C resulted in an endothermic peak. This endothermic peak indicates the formation of a solid solution formation by the reaction of TiO₂ with Cr₂O₃. As the temperature increased to about 950 掳C the Ca started to melt (at approximately 847 掳C) resulting to an exothermic peak due to the reaction of Ca with Cr₂O₃ forming Cr metal. The formation of CaTiO₃ formed by the reaction of CaO with TiO₂ decreased the amount of TiO₂ in the mixture of starting materials. When the mixture was heated up to 1058 掳C, Ca reacted with TiO₂ forming Ti as indicated by an exothermic reaction forming Ti. Finally, when the holding time at 1200 掳C and the amount of Ca were increased, the TiCr₂ intermetallic was formed while the CaTiO₃ compound was gradually disintegrated into CaO and Ti and the amount of oxygen content in samples was decreased. The obtained intermetallic powder showed the capability of hydrogen storage after being activated.