摘要
研究了LaFe11.6Si1.4磁制冷材料25℃下的吸放氢热力学及不同氢压(2.0×106、2.5×106及3.0×106Pa)下的吸氢动力学行为。结果表明:LaFe11.6Si1.4合金常温吸放氢存在约2×105Pa的严重滞后现象,吸氢过程存在氢压敏感的吸氢孕育期,提高氢压可快速完成吸氢饱和,但对饱和吸氢量影响甚微。常温下难于通过改变氢压的技术制备精确含氢量即可变居里温度的LaFe11.6Si1.4室温磁制冷材料。
The hydrogen absorption-desorption thermodynamics of the magnetic refrigeration material LaFe11.6Si1.4 alloy at 25 ℃ and its hydrogen absorption kinetics under different hydrogen pressures （2.0× 106,2.5× 106 and 3.0× 106 Pa） have been investigated.The results show that about 2× 105 Pa hysteresis occurs in the process of hydrogen absorption and hydrogen desorption of LaFe11.6Si1.4 alloy at room temperature; there is an incubation period sensible to the hydrogen pressure in the process of hydrogen absorption.Increasing hydrogen pressure conduces to saturated alloy hydride rapidly,whereas it slightly influences the hydrogen absorption capacity.It is difficult to prepare LaFe11.6Si1.4 magnetic refrigeration material with accurate hydrogen content,i.e.variable Curie temperature,via changing the hydrogen pressure at room temperature.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2013年第10期2136-2138,共3页
Rare Metal Materials and Engineering
基金
国家自然科学基金(51176050)
关键词
磁制冷材料
吸放氢行为
居里温度
magnetic refrigeration materials
hydrogen absorption and desorption behaviour
the Curie temperature
