Heat exchangers made of polymer-bonded La(Fe,Si)13
| Autor: | Tino Gottschall, Iliya Radulov, Oliver Gutfleisch, D. Yu. Karpenkov, K. P. Skokov, Maximilian Fries, B. Kaeswurm, Michael D. Kuz’min |
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| Přispěvatelé: | Publica |
| Rok vydání: | 2014 |
| Předmět: |
010302 applied physics
Materials science Metallurgy Compaction General Physics and Astronomy 02 engineering and technology Epoxy 021001 nanoscience & nanotechnology 01 natural sciences Grain size Cracking visual_art 0103 physical sciences Heat exchanger Magnetic refrigeration visual_art.visual_art_medium Composite material 0210 nano-technology Porous medium Porosity |
| Zdroj: | Journal of Applied Physics. 115:17A941 |
| ISSN: | 1089-7550 0021-8979 |
| DOI: | 10.1063/1.4868707 |
| Popis: | We report on magnetocaloric properties of polymer-bonded La(Fe,Si)(13) heat exchangers with respect to the grain size of the powder used and the pressure applied for compaction of plates. Quite remarkably, it was found that the values of the adiabatic temperature change of polymer-bonded plates are 10% higher than in the initial bulk material. A critical value of the pressure applied during the compaction was found. Exceeding this value leads to a drastic reduction of the magnetocaloric effect due to cracking and comminution of the initial 50-100 mu m grains down to 1-10 mu m fragments. Compacting the LaFe11.6Si1.4 powder with 5 wt.% of silver epoxy under an optimal pressure of 0.1 GPa resulted in the production of 0.6 mm-thick plates. These plates were subsequently stacked and glued together into a simple porous heat exchanger with straight 0.6 mm-width channels. |
| Databáze: | OpenAIRE |
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