Hydrogen Absorption and Desorption of Titanium

摘要: 对纯Ti在500和580℃下的吸氢速率常数进行了测定。500℃时,纯Ti吸氢速率随循环测试次数增多而变小,且吸氢动力学曲线出现拐点,吸氢时发生α→β和β→δ2次相变。580℃下的吸氢速率较500℃下的明显变快,吸氢动力学曲线为直线,吸氢时未发生β→δ相变。研究了表面及晶粒度对磁控溅射和球磨制备的TiH2放氢过程的影响。结果表明,在相同升温速率下,由磁控溅射和球磨制备的纳米晶氢化物的放氢曲线与块体材料的放氢曲线存在显著差异。此现象与样品中的缺陷结构有关。

Abstract: The paper concerns in the hydrogenation of Ti and dehydrogenation of TiH_2.The rates of hydrogen absorption of Ti at 500 and 580 ℃ were measured.The hydrogen absorption curves at 500 ℃ can be divided into two segments with different slopes,and the hydrogen absorption curve at 580 ℃ is a linear line for pure titanium.A two-step phase transition(α→β→δ) for hydrogen absorption of Ti at 500 ℃ was discussed.Effect of grain size on dehydrogenation of TiH_2 was studied.Dehydrogenation of nano-scale hydride powders differs considerably from that of TiH_2 processed from bulk Ti.