Article, 2024

Microchannel magnetic regenerators with optimized porosity by electrodischarge drilling: Microstructure and refrigeration performance

Materialia, ISSN 2589-1529, Volume 33, Page 102034, 10.1016/j.mtla.2024.102034

Contributors

Miao, Liya [1] [2] Wang, Kun 0000-0002-3202-1872 (Corresponding author) [3] Lu, Xiang (Corresponding author) [2] Zhang, Yifei [2] Liu, Jian 0000-0002-9853-3619 (Corresponding author) [4]

Affiliations

  1. [1] University of Chinese Academy of Sciences
    2. [NORA names: China; Asia, East];
  2. [2] Ningbo Institute of Industrial Technology
    3. [NORA names: China; Asia, East];
  3. [3] Technical University of Denmark
    4. [NORA names: DTU Technical University of Denmark; University; Denmark; Europe, EU; Nordic; OECD];
  4. [4] Shanghai University
    5. [NORA names: China; Asia, East]

Abstract

In this study, electrodischarge drilling is proposed to prepare LaFe11Co0.8Si1.2 magnetic regenerator with circular microchannels. We find that the drilling process leads to the microstructure consisting of the dominant α-Fe phase and sporadic distributed La-rich phase near the channel surface. In contrast, the microstructure away from the channels is not influenced and shows the typical dendritic morphology. Upon annealing, the microchannel blocks show a maximum entropy change of 6.0 J kg−1 K−1 at 0–2 T around room temperature. Further, we evaluated the regeneration performance of our magnetic refrigerators by using a one-dimension active magnetic regeneration numerical model, and a considerable specific cooling power of 11.1–18.3 W kg−1 is obtained. This study suggests electrodischarge drilling as a promising method for fabricating magnetocaloric regenerators with circular microchannels.

Keywords

La-rich phase, annealing, block, changes, channel, circular microchannels, consistency, cooling, cooling power, dendritic morphology, drilling, drilling process, entropy change, magnetic refrigeration, magnetic regenerator, magnetocaloric regenerators, maximum entropy change, method, microchannel, microchannel block, microstructure, microstructure consisting, model, morphology, numerical model, performance, phase, porosity, power, process, refrigeration, refrigeration performance, regeneration, regeneration performance, room, room temperature, study, temperature

Funders

  • National Natural Science Foundation of China
  • Ministry of Science and Technology of the People's Republic of China

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