Magnetic hysteresis loss and corrosion behavior of LaFe11.5Si1.5 particles coated with Cu
Magnetic hysteresis loss and corrosion behavior of LaFe11.5Si1.5 particles coated with Cu
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Cu包覆LaFe11.5Si1.5颗粒的磁滞损耗及腐蚀行为
DOI：
10.1063/1.4795265
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发表时间：
2013-03
影响因子：
3.2
通讯作者：
He, J.
中科院分区：
文献类型：
--
作者：
Zhang, N. N.;You, C. Y.;Gao, B.;He, J.
孔隙的存在有利于La(Fe, Si)13基磁热材料在充磁和退磁过程中释放应变，从而减小磁滞损失，提高材料的机械稳定性。但孔隙率会影响传热和腐蚀行为。本文研究了高塑性Cu涂层对LaFe11.5Si1.5颗粒磁热性能和耐蚀性的影响。结果表明，Cu涂层对磁熵变化的影响较小，但磁滞损失较小。在最大磁场为1.5 T时，包覆Cu和未包覆Cu的颗粒均表现出相似的8 J/kg k的磁熵变化，磁滞损失由2.2 J/kg减小到1.8 J/kg。腐蚀电流密度降低，腐蚀电位升高，表明Cu涂层提高了合金的耐蚀性。
The existence of porosity is useful for releasing the strain during the magnetization and demagnetization processes of La(Fe, Si)13-based magnetocaloric materials, resulting in the decreases of magnetic hysteresis loss and the improvement of mechanical stability. But the porosity would affect the heat transfer and corrosion behavior. In this work, we studied the effect of highly plastic Cu coating on the magnetocaloric properties and corrosion resistance of LaFe11.5Si1.5 particles. It was found that Cu coating had less influence on the magnetic entropy changes, but presented a less magnetic hysteresis loss. Under a maximum field of 1.5 T, both particles with and without coating showed the similar magnetic entropy changes of 8 J/kg K. Magnetic hysteresis loss was decreased from 2.2 to 1.8 J/kg after Cu coating. The corrosion current density was decreased and the corrosion potential was increased, indicating an improvement of the corrosion resistance with Cu coating.
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