Journal
MATERIALS TODAY ENERGY
Volume 9, Issue -, Pages 223-228Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.mtener.2018.05.009
Keywords
Magnetocaloric cooling; Composite materials; Regenerator; Shaping process; Powder-in-tube
Funding
- German Research Foundation in the framework of SPP1599 Ferroic Cooling [WA3294/3-2]
- Germany Federal Ministry for Economic Affairs and Energy [03ET1374B]
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The powder-in-tube (PIT) technology was applied to La(Fe, Co, Si)(13) powder cladded by a thin seamless austenitic steel jacket. Wires appear to be promising in the search for alternative regenerator geometries, since they offer various possibilities of arrangements allowing to optimise heat transfer and pressure loss within the boundaries set by parallel plate and sphere beds. Here, pre-alloyed La(Fe, Co, Si)(13) powder was filled in a AISI 316L austenitic steel tube and swaged to wires with an outer diameter of 1 mm. By mechanical deformation, the steel jacket thickness was reduced to about 100 mu m surrounding the magnetocaloric core. A post-annealing of only 10 min at 1050 degrees C is sufficient to form the magnetocaloric NaZn13-type phase resulting in an entropy change close to the value of a pure reference sample. The presented technology is not limited to La(Fe, Co, Si)(13)/steel combination but can be extended to material pairs involving wire core materials with a first order transition, such as Fe2P-type or Heusler alloys. (C) 2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license.
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