Abstract
This manuscript presents our patent for a more effective magnetocaloric material based on Gd5Si2Ge2 as well as its method of production. The material has high refrigeration capacities and, with modifications to its composition, it is possible to control the temperature at which its magnetocaloric effect is the largest. This effect was achieved by modifying the stoichiometry of the starting composition. First, the Si or Ge is replaced with Fe in the starting composition; then, there is an additional heat treatment and quenching of the alloy. This produces a novel microstructure and a magnetocaloric material with an enhanced refrigeration capacity. Although the magnetocaloric effect is slightly reduced as a result of this process, the iron indirectly affects the microstructure and thereby reduces the hysteresis losses that occur during the first-order structural transformation. Hysteresis losses, of course, have a very detrimental effect on the refrigeration capacity. We observe that even a small amount of iron increases the refrigeration capacity up to 12%. Furthermore, by changing the amount of iron, we can alter the temperature at which the magnetocaloric effect is the largest. This then increases the temperature range over which this material can be applied. The patent covers the process for improving the usefulness of magnetocaloric Gd5Si2Ge2-based alloys as a working material for a magnetocaloricbased refrigerator. These refrigerators are energetically more efficient and environmentally less harmful than regular compressor-based refrigerators.
Keywords: Complex metallic alloys, crystal structure, hysteresis losses, intermetallic alloys, magnetic refrigeration, microstructure, refrigeration capacity, thermomagnetic properties.
Recent Patents on Materials Science
Title:Complex Metallic Alloys for Applications in Magnetic Refrigeration
Volume: 8 Issue: 2
Author(s): Benjamin Podmiljsak, Paul J. McGuiness and Spomenka Kobe
Affiliation:
Keywords: Complex metallic alloys, crystal structure, hysteresis losses, intermetallic alloys, magnetic refrigeration, microstructure, refrigeration capacity, thermomagnetic properties.
Abstract: This manuscript presents our patent for a more effective magnetocaloric material based on Gd5Si2Ge2 as well as its method of production. The material has high refrigeration capacities and, with modifications to its composition, it is possible to control the temperature at which its magnetocaloric effect is the largest. This effect was achieved by modifying the stoichiometry of the starting composition. First, the Si or Ge is replaced with Fe in the starting composition; then, there is an additional heat treatment and quenching of the alloy. This produces a novel microstructure and a magnetocaloric material with an enhanced refrigeration capacity. Although the magnetocaloric effect is slightly reduced as a result of this process, the iron indirectly affects the microstructure and thereby reduces the hysteresis losses that occur during the first-order structural transformation. Hysteresis losses, of course, have a very detrimental effect on the refrigeration capacity. We observe that even a small amount of iron increases the refrigeration capacity up to 12%. Furthermore, by changing the amount of iron, we can alter the temperature at which the magnetocaloric effect is the largest. This then increases the temperature range over which this material can be applied. The patent covers the process for improving the usefulness of magnetocaloric Gd5Si2Ge2-based alloys as a working material for a magnetocaloricbased refrigerator. These refrigerators are energetically more efficient and environmentally less harmful than regular compressor-based refrigerators.
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Cite this article as:
Podmiljsak Benjamin, J. McGuiness Paul and Kobe Spomenka, Complex Metallic Alloys for Applications in Magnetic Refrigeration, Recent Patents on Materials Science 2015; 8 (2) . https://dx.doi.org/10.2174/1874464808666150427223327
DOI https://dx.doi.org/10.2174/1874464808666150427223327 |
Print ISSN 1874-4648 |
Publisher Name Bentham Science Publisher |
Online ISSN 1874-4656 |
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