La0.8Ce0.2(Fe0.95Co0.05)11.8Si1.2/Sn42Bi58 magnetocaloric composites prepared by low temperature hot pressing

Abstract La 0.8 Ce 0.2 (Fe 0.95 Co 0.05 ) 11.8 Si 1.2 /Sn 42 Bi 58 magnetic refrigeration bulk composites were prepared by low temperature hot pressing (HP) technique at 138 °C. Sn-Bi eutectic alloy (Sn 42 Bi 58 ) was used as binder. During the process of HP, the molten Sn 42 Bi 58 alloy filled the gaps between the particles. Hence, the composites retained good magnetocaloric properties. The density of the composites gradually increased at larger HP pressure. The thermal conductivity and mechanical property of the composites also improved remarkably. By controlling the processing conditions, a series of La 0.8 Ce 0.2 (Fe 0.95 Co 0.05 ) 11.8 Si 1.2 /Sn 42 Bi 58 bulk composites with high entropy change values of 5.57–6.70 J/(kg·K) at 2 T, high thermal conductivity of 10.72–19.64 W/(m·K) and compressive strength of 189–303 MPa were obtained. The present results indicate that low temperature HP technique can be used in mass production of high performance magnetocaloric materials.