4.7 Article

Novel fabrication of honeycomb-like magnetocaloric regenerators via a self-organization process

Journal

SCRIPTA MATERIALIA
Volume 223, Issue -, Pages -

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2022.115067

Keywords

Magnetocaloric effect; Magnetic refrigeration; Self -organization process; Microstructure

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The geometry of a magnetocaloric regenerator plays a crucial role in the performance and heat exchange efficiency of a magnetic refrigerator. A new and easy method has been proposed to produce monolithic MRs with highly ordered and unidirectional oriented microchannels. The MRs retain an orthorhombic perovskite structure after sintering, exhibiting a significantly higher isothermal entropy change.
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 La0.67Ca0.33MnO3 MRs with highly ordered and unidirectional oriented microchannels. This is realized by a selforganization process of alginate sol, which does not require specific processing equipment and hence is wellsuited 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 mu m 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 La0.67Ca0.33MnO3 powders 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.

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