材料期刊网

作为吸氢合金,Zr2Fe合金具有吸氢速度快、吸氢效率高、空气中不易自燃等特点,可以应用在工业生产过程中的很多领域.Zr2 Fe合金用作氢回收材料时,可以在氢浓度较低的情况下吸收氢气.本实验中使用悬浮加热炉在氩气保护下制备Zr2 Fe合金,采用X射线衍射仪(XRD)测定合金在不同处理条件下的相结构,采用扫描电子显微镜(SEM)观察合金的微观背散射形貌,观察合金反应前后元素变化规律,使用本单位自制Sievert法气体系统测试合金与氢气反应过程中动力学曲线.研究发现,Zr2 Fe合金吸氢后形成Zr2 FeH5相,该相在温度与压力的共同作用下容易发生歧化反应,形成ZrH2相和ZrFe2相并放出一定量氢气,并且在相应反应条件下该歧化反应不可逆,严重影响合金的使用寿命和使用成本.实验结果表明系统中温度、氢气压力越高,Zr2 Fe合金吸氢相歧化反应发生速率越快,但相比于压力作用效果温度是影响Zr2 Fe合金歧化反应进程的主要因素.

As hydrogen-absorbing material,Zr2Fe alloy had the features of high hydrogen absorption speed,high storage efficiency and not easy to spontaneous combustion in the air.It could be used in many industrial production areas.Zr2 Fe alloy was commonly used as a kind of hydrogen isotope gas recycling material;Zr2Fe could absorb hydrogen in the lower concentration and accomplish the purposes of purification and recovery.Suspension heating furnace was used to prepare Zr2 Fe alloy under Ar air protection.The phase structure of Zr2Fe alloy after different treatment conditions was tested by X-ray diffractometer (XRD).Zr2Fe alloy's microstructure morphology was observed by the scanning electron microscope (SEM),the backscatter was used to judge element changing in the alloy.The dynamic curve when the reaction happened between Zr2Fe alloy and hydrogen was tested by self-made hydrogen absorbing test system that followed Sievert's law.The research found that Zr2FeH5 phase formed in Zr2Fe alloy after hydrogen-absorbing reaction.The Zr2 FeH5 phase was likely to disproportionate in the joint action of temperature and pressure,ZrH2 phase and ZrFe2 phase formed with a certain amount of hydrogen released.But the disproportionation reaction was not reversible under appropriate reaction conditions,seriously affecting the service life and the cost of alloy.Experimental results showed that the disproportionation reaction rate of Zr2 FeH5 phase was faster in higher system temperature and hydrogen pressure,especially comparing to the pressure effect,and temperature was a major factor that influenced Zr2 FeHs phase disproportionation.