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系统研究了温度、时间、压力等因素对LaFe11.5Si1.5化合物吸氢过程的影响以及效果.结果表明:吸氢处理会增大化合物的晶格常数,但不会改变其晶体结构.在温度为423 K,氢气压力为0.0987 MPa时,可以制备出氢分布均匀的LaFe11.5Si1.5H1.6间隙化合物.氢化处理可以明显提高化合物的居里温度,降低热滞后,并且使磁熵变保持在较高值.LaFe11.5Si1.5H1.6样品随着在空气中暴露时间的延长,居里温度和磁熵值的变化非常小,氢化合金的磁热性能具有良好的时间稳定性.
The effects of temperature, time and pressure on the hydrogen absorption of LaFe11.5Si1.5 compounds were systematically investigated.The results show that the hydrogen absorption increases the lattice constant of the compounds without changing their crystal structure, Is 423 K and the hydrogen pressure is 0.0987 MPa, LaFe11.5Si1.5H1.6 interstitial compounds with uniform hydrogen distribution can be prepared.Hydrogenation can significantly increase the Curie temperature, decrease thermal hysteresis, and keep the magnetic entropy change at Higher values.LaFe11.5Si1.5H1.6 samples with the exposure time in the air, Curie temperature and magnetic entropy change is very small, hydrogenated alloy magnetocaloric properties with good time stability.