复合粘结La0.8Ce0.2Fe11.7- x Mn x Si1.3H1.8 磁工质的磁性能

Magnetic Properties of Mix-Bonded La0.8Ce0.2Fe11.7- x Mn x-Si1.3H1.8 Magnetic Refrigerants

摘要:

采用中频感应炉制备La_0.8Ce_0.2Fe_11.7-xMn_xSi_1.3母合金并退火，将合金饱和氢化后破碎成粉末。通过环氧树脂粘结，将居里温度T_C间隔为5 K的多种La_0.8Ce_0.2Fe_11.7-xMn_xSi_1.3H_1.8（x=0.23，0.26，0.29，0.32，质量分数，%）合金粉末进行混合粘结，提高合金的磁熵半峰宽。用VersaLab和绝热温变直接测量仪测试粘结样品的磁性能。结果表明，与单一成分粘结样品相比，混合粘结样品的最大等温磁熵变有所降低，磁熵半峰宽以及相对制冷能力有所提高。含4种成分的混合粘结样品的相对制冷能力可以达到139.2 J/kg。

Abstract:

La_0.8Ce_0.2Fe_11.7-xMn_xSi_1.3 master alloys were prepared by medium frequency induction furnace, then annealed, saturatedly hydrogenated, and finally crushed into powders. The multiple components of La_0.8Ce_0.2Fe_11.7-xMn_xSi_1.3H_1.8 (x=0.23, 0.26, 0.29, 0.32, wt%) powders with the Curie temperature (T_C) interval of 5 K were mix-bonded by epoxy resin to extend the full width at half maximum of magnetic entropy of alloy. The magnetic properties of the mix-bonded specimens were measured by VersaLab and adiabatic temperature change direct test device. The maximal magnetic entropy change of the mix-bonded specimens is decreased, whereas the full width at half maximum of magnetic entropy and the relative cooling power are increased, compared with those of the single-component-bonded specimens. The maximal relative cooling power is 139.2 J/kg for the four-component-bonded specimen.