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

作者：Pulko Barbara^*; Tusek Jaka; Moore James D; Weise Bruno; Skokov Konstantin; Mityashkin Oleg; Kitanovski Andrej; Favero Chiara; Fajfar Peter; Gutfleisch Oliver; Waske Anja; Foredos Alojz

来源：Journal of Magnetism and Magnetic Materials, 2015, 375: 65-73.

DOI：10.1016/j.jmmm.2014.09.074

• Magnetocaloric effect
• Magnetic refrigeration
• La-Fe-Co-Si
• Active magnetic regenerator
• Epoxy

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.

• 出版日期2015-2-1