Novel fabrication of honeycomb-like magnetocaloric regenerators via a self-organization process. (15th January 2023)

• Record Type: Journal Article
• Authors: Wang, Chenxu; Miao, Xuefei; Zha, Jiaju; Guo, Wenhui; Ren, Qingyong; Zhang, Yujing; Xu, Feng; Caron, Luana
• Is Part Of: Scripta materialia. Number 223(2023)
• Publication Date: 2023-01-15
• Subjects: Magnetocaloric effect -- Magnetic refrigeration -- Self-organization process -- Microstructure; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2022.115067
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: 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 La0.67 Ca0.33 MnO3 MRs 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 La0.67 Ca0.33 MnO3 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. Graphical abstract: Image, graphical abstract