Novel fabrication of honeycomb-like magnetocaloric regenerators via a self-organization process
Novel fabrication of honeycomb-like magnetocaloric regenerators via a self-organization process
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DOI：
10.1016/j.scriptamat.2022.115067
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发表时间：
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影响因子：
6
通讯作者：
Chenxu Wang;X. Miao;Jiaju Zha;Wenhui Guo;Q. Ren;Yujing Zhang;Feng Xu;L. Caron
中科院分区：
文献类型：
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作者：
Chenxu Wang;X. Miao;Jiaju Zha;Wenhui Guo;Q. Ren;Yujing Zhang;Feng Xu;L. Caron
磁热蓄冷器的几何形状对磁制冷机的热交换效率和性能有着重要的影响。在这里，我们提出了一种新的和简便的方法来生产单片La0.67Ca0.33MnO3MR与高度有序和单向取向的微通道。这是通过藻酸盐溶胶的自组织过程实现的，其不需要特定的加工设备，因此非常适合于大规模生产。所制备的微通道的平均直径和总孔隙率分别在71.5-156.3 μm和15.3%-21.5%范围内可调。正交钙钛矿结构保留在烧结的MR中，没有任何可检测的第二相。此外，由于晶粒尺寸的增加，烧结后的MR比原始的La 0. 67 Ca 0. 33 MnO 3粉末表现出更高的等温熵变。因此，我们的研究可能会引发一个突破，在大规模生产的单片磁共振与理想的几何形状的磁制冷机。
The geometry of a magnetocaloric regenerator (MR) is crucial to the heat exchange efficiency and the performance of a magnetic refrigerator. Here we proposed a new and facile way to produce monolithic La0.67Ca0.33MnO3MRs with highly ordered and unidirectional oriented microchannels. This is realized by a self-organization process of alginate sol, which does not require specific processing equipment and hence is well-suited for large-scale production. The average diameter and total porosity of the well-defined microchannels can be adjusted in the range of 71.5–156.3 μm and 15.3%-21.5%, respectively. The orthorhombic perovskite structure is retained in the sintered MRs without any detectable secondary phase. Besides, the sintered MRs exhibit a significantly higher isothermal entropy change than the original La0.67Ca0.33MnO3powders due to an increase in the grain size. Consequently, our study may trigger a breakthrough in the large-scale production of monolithic MRs with desirable geometries for magnetic refrigerators.