Novel processing of Cu-bonded La-Ce-Fe-Co-Si magnetocaloric composites for magnetic refrigeration by low-temperature hot
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Research Letter
Novel processing of Cu-bonded La–Ce–Fe–Co–Si magnetocaloric composites for magnetic refrigeration by low-temperature hot pressing D. R. Peng, School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China X. C. Zhong, School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China; School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore J. H. Huang, Baotou Research Institute of Rare Earths, Baotou 014030, China H. Zhang, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China Y. L. Huang, School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China X. T. Dong, D. L. Jiao, and Z. W. Liu, School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China R. V. Ramanujan, School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore; Singapore-HUJ Alliance for Research and Enterprise (SHARE), Nanomaterials for Energy and Energy-Water Nexus (NEW), Campus for Research Excellence and Technological Enterprise (CREATE), Singapore 138602, Singapore Address all correspondence to X. C. Zhong at [email protected] (Received 11 April 2018; accepted 30 May 2018)
Abstract We report on a novel processing route to prepare La0.8Ce0.2(Fe0.95Co0.05)11.8Si1.2/Cu bulk composites by low-temperature hot pressing. With increasing copper content, the compressive strength of the composites first decrease and then increase owing to the buffering effect of copper, but the magnetocaloric effect reduces to some extent. Copper addition improves the thermal conductivity of the composites, which compensates for the decrease in thermal conductivity due to porosity. A relatively large entropy change of 5.75–7.19 J/(kg K) at 2 T near the Curie temperature (249 K), good thermal conductivity of 7.51–15.55 W/(m·K), and improved compressive strength of 151.1–248.0 MPa make these composites attractive magnetic refrigeration materials.
Introduction Magnetic refrigeration is an environmentally friendly and energy efficient technology based on the magnetocaloric effect (MCE) which aims to replace gas compression-based refrigeration.[1–3] La(Fe,Si)13-based compounds have the advantages of large magnetic entropy change (–ΔSM), low-cost, nontoxicity, and continuously adjustable Curie temperature near room temperature (TC).[4] Considerable research has been carried out to improve the MCE of La(Fe, Si)13-based alloys, e.g., optimizing the heat treatment conditions[5,6] and compositions.[7,8] A near-room temperature TC value is a key requirement, elevating TC by the substitution of Co for Fe atoms[9] or by adding interstitial atoms such as H[10] and B[11] has been studied. Among these methods, doping H atom increases TC significantly without reducing the MCE. High thermal conductivity and good mechanical properties are also important for
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