Kinetics of thermal decomposition of titanium hydride powder using in situ high-temperature X-ray diffraction (HTXRD)
Kinetics of thermal decomposition of titanium hydride powder using in situ high-temperature X-ray diffraction (HTXRD)
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DOI：
10.1590/s1516-14392005000300012
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发表时间：
2005-09
影响因子：
1.7
通讯作者：
H. Sandim;Bruno Vieira Morante;P. Suzuki
中科院分区：
文献类型：
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作者：
H. Sandim;Bruno Vieira Morante;P. Suzuki
采用热重分析（TGA）和高温X射线衍射（HTXRD）研究了氢化钛粉末（d相）在高真空条件下热分解为钛（a相）的过程。在室温至1000 °C的温度下，通过HTXRD原位跟踪d-to-a相变。还分析了在450至650 °C的等温条件下转化作为时间的函数。热重分析结果表明，氢化钛在450 °C左右开始分解。在500 °C以上，分解在短于50分钟的时间内完成。氢脱附的表观活化能为63 ± 6 kJ·mol ~（-1）。
The thermal decomposition of titanium hydride powder (d-phase) to titanium (a-phase) was investigated by means of thermogravimetric analysis (TGA) and high-temperature X-ray diffraction (HTXRD) in high vacuum. The d-to-a phase transformation was followed in situ by HTXRD at temperatures varying from room temperature up to 1000 °C. The transformation was also analyzed as a function of time at isothermal conditions from 450 to 650 °C. The results of TGA show that the decomposition of the titanium hydride becomes significant at about 450 °C. Above 500 °C the decomposition is completed in times shorter than 50 minutes. The apparent activation energy for hydrogen desorption was found to be 63 ± 6 kJ.mol-1.