Skokov, K. P. ; Karpenkov, D. Yu. ; Kuz'min, M. D. ; Radulov, I. A. ; Gottschall, T. ; Kaeswurm, B. ; Fries, M. ; Gutfleisch, O. (2014):
Heat exchangers made of polymer-bonded La(Fe,Si)13.
In: Journal of Applied Physics, 115 (17), pp. 17A941. AIP Publishing LLC, ISSN 0021-8979,
[Article]
Abstract
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 μm grains down to 1–10 μm 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.
| Item Type: | Article |
|---|---|
| Erschienen: | 2014 |
| Creators: | Skokov, K. P. ; Karpenkov, D. Yu. ; Kuz'min, M. D. ; Radulov, I. A. ; Gottschall, T. ; Kaeswurm, B. ; Fries, M. ; Gutfleisch, O. |
| Title: | Heat exchangers made of polymer-bonded La(Fe,Si)13 |
| Language: | English |
| Abstract: | 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 μm grains down to 1–10 μm 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. |
| Journal or Publication Title: | Journal of Applied Physics |
| Volume of the journal: | 115 |
| Issue Number: | 17 |
| Publisher: | AIP Publishing LLC |
| Divisions: | 11 Department of Materials and Earth Sciences > Material Science > Functional Materials 11 Department of Materials and Earth Sciences > Material Science 11 Department of Materials and Earth Sciences |
| Date Deposited: | 31 Mar 2014 07:37 |
| URL / URN: | http://dx.doi.org/10.1063/1.4868707 |
| Identification Number: | doi:10.1063/1.4868707 |
| PPN: | |
| Funders: | The research leading to these results has been partially funded by from the European Community's 7th Framework Program under the grant agreement No. 310748 (DRREAM). , We also gratefully acknowledge financial support from the German Federal Ministry of Education and Research under the VIP Project No. 03V0540 (MagKal). |
| Export: | |
| Suche nach Titel in: | TUfind oder in Google |
 |
Send an inquiry |
Options (only for editors)
 |
Show editorial Details |
Drucken
Impressum