Epoxy-bonded La-Fe-Co-Si magnetocaloric plates

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:375

Article

Pulko, Barbara¹  Tusek, Jaka¹  Moore, James D.²  Weise, Bruno³  Skokov, Konstantin⁴  Mityashkin, Oleg²  Kitanovski, Andrej¹  Favero, Chiara⁵  Fajfar, Peter⁶  Gutfleisch, Oliver⁴  Waske, Anja³  Foredos, Alojz¹ 

[1] Univ Ljubljana, Fac Mech Engn, Ljubljana 1000, Slovenia

[2] IFW Dresden, Inst Met Mat, D-01069 Dresden, Germany

[3] IFW Dresden, Inst Complex Mat, D-01069 Dresden, Germany

[4] TV Darmstadt, Dept Mat Sci, D-64287 Darmstadt, Germany

[5] Parker Hannifin Mfg Srl, Hiross Zander Div, I-35020 Padua, Italy

[6] Univ Ljubljana, Fac Nat Sci & Engn, Ljubljana 1000, Slovenia

关键词: Magnetocaloric effect;    Magnetic refrigeration;    La-Fe-Co-Si;    Active magnetic regenerator;    Epoxy;   

DOI  :  10.1016/j.jmmm.2014.08.074

来源: Elsevier

【 摘 要 】

We report the processing, analysis and testing of magnetocaloric composite materials consisting of La-Fe-Co-Si particles of various size fractions and a polymer matrix. All of the composites have working temperatures close to room temperature. The composites were pressed into thin plates, a geometry favorable for testing the composites in an active magnetic regenerator (AMR). In order to investigate the influence of particle size and binder type (epoxy), eight different epoxy-bonded La-Fe-Co-Si plates were made and analyzed. We found that the higher filling factor that can be achieved by using a mixture of several particle size fractions has beneficial influence on the thermal conductivity. Tests in the AMR revealed that a maximum temperature span of approximately Delta T=10 K under magnetic field change of H-mu o=1.15 T can be obtained at no cooling load conditions. The stability of the measured AT values and the mechanical integrity of sample after cyclic application of a magnetic field have been monitored for 90,000 cycles and showed no significant changes. We therefore conclude that epoxy bonded La-Fe-Co-Si magnetocaloric composites have good magnetocaloric properties at low material processing costs and hence represent a competitive way to produce magnetocaloric materials to be used in AMR. (C) 2014 Elsevier B.V. All rights reserved.

【 授权许可】

Free