Magnetocaloric heat exchangers made from metal-bonded La(Fe,Mn,Si)13Hx powder

Summary form only given. In this work, we report on a new method for production of metal coated La(FeMnSi)
₁₃
H
_x
powders and a comparative study of their magnetocaloric properties before and after coating. The experimental work was performed using La(Fe,Mn,Si)
₁₃
H
_x
powders provided by Vacuumschmelze GmbH & Co. KG. The three grades of initial powders were in the form of irregular particles with sizes 750 - 1000 μm and transition temperatures were T
_tr
=293 K, 295 K and 297 K. The particles were coated in 3 steps: First, their surface was chemically cleaned and activated. Then, the particles were hot dip coated in a metal alloy with a melting temperature of T
_m
= 350 K. Finally, the amount of coating was reduced to 5 wt. % by centrifugation at temperature slightly above T
_m
.