采用工业纯原料感应熔炼制备出公斤级La0.6Pr0.4Fe11.4Si1.6B0.2合金,经退火后通过吸氢处理提高其居里温度到室温附近.研究了在1373～1473K温度下经不同时间和温度退火对合金微观组织结构的影响.实验发现在1473K经30 h退火样品的居里温度为202K,在 0～1.5 T变化磁场下的最大磁熵变达8.1～8.6 J/kg.K.在0.13 MPa氢气压力下,经553K吸氢5h氢化处理合金的居里温度为320 K,最大磁熵变达7.7～8.0 J/kg.K.
La0.6Pr0.4Fe11.4Si1.6B0.2 alloy of kilogram grade was produced by an induction melting method with industrial raw materials,and then the annealed alloy was hydrogenated to increase its Curie temperature to around room temperature.The microstmcture of the alloy was examined after annealing at 1373～1473 K for different time.Results show that the Curie temperature of the alloy annealed at 1473 K for 30 h is 202 K and the maximum magnetic entropy changes are 8.1～8.6 J/kg·K under a magnetic change of 1.5 T.The Curie temperature of the alloy is increased to 320 K by hydrogenating at 553 K and 0.13 MPa H2 pressure for 5 h,and the maximum magnetic entropy changes of 7.7～8.0 J/kg·K are also obtained.
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