| [CHENG Juan,HUANG Jiaohong,YOU Caiyin,LI Bo,LIU Cuilan and GUO Yaru.Research on the Magnetocaloric Effect of La(Fe, Si)13HyMagnetic Refrigeration Material Prepared by Hot-pressed Method at High Temperature[J].Rare Metal Materials and Engineering,2023,52(1):318~322.] |
| Research on the Magnetocaloric Effect of La(Fe, Si)13HyMagnetic Refrigeration Material Prepared by Hot-pressed Method at High Temperature |
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| Received:December 10, 2021 Revised:January 24, 2022 |
| DOI： |
| Key words: Magnetic refrigeration, Magnetocaloric effect, Hot pressed |
| Foundation item:国家自然科学基金资助(项目号52066001), 内蒙自然科学基金资助(项目号2021MS05016), 北方稀土项目资助(项目号BFXT-2021-D-0013) |
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| Abstract: |
| La(Fe, Si)13HY based alloy is regarded as the candidate of the room temperature magnetic refrigeration materials. However as the poor mechanical property of the hydride which is difficult to be used in the magnetic refrigerator. How to prepare the magnetic refrigrant with large magnetocaloric effect is the key problem to be solved. In this paper La0.8Ce0.2Fe11.51Mn0.19Si1.3master alloy was prepared by medium frequency induction furnace and annealed, followed by milling to powder. The alloy podwer was hot pressed at 650 ℃, 850 ℃ and 1050 ℃ respectively. The resulted La0.8Ce0.2Fe11.51Mn0.19Si1.3alloy was cut into plates and then hydrogenated until saturated. The phase constitution, microstructure and magnetocaloric effect of samples was determined by XRD, SEM and VersLab. The porosity is the lowest and the volumetric magnetic entropy change is the alrgest (144.7 mJ/cm3?K) for the sample hot pressed at 1050 ℃. The Curie temperature increase to near room temperature, the large magnetocaloric effect of the first order phase transition is still maintained for the sample hot pressed at 1050 ℃ after hydrogenation. No cracks on the surface are found on the hydride and keep integrity. |
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