Mechanical and magnetocaloric properties of La(Fe,Mn,Si)13Hδ/Cu plates prepared by Cu-binding prior to hydrogenation

• Published in: Intermetallics 2019-03, Vol.106, p.124-129
• Main Authors: Li, Y.Q., Wu, Q.C., Shen, F.R., Zhou, H.B., Hu, F.X., Wang, J., Sun, J.R., Shen, B.G.
• Format: Article
• Language: English
• Subjects: Hydrogenation; La(Fe,Mn,Si)13Hδ plates; Magnetocaloric properties; Mechanical properties; Metal-binding
• ISSN: 0966-9795
• DOI: 10.1016/j.intermet.2019.01.003

La(Fe,Si)13Hδ hydrides with large magnetocaloric effect (MCE) have been demonstrated as promising magnetic refrigerants around room temperature. To meet the shape requirements in a refrigerator, hot-pressing technique was usually employed. However, hydrogenation prior to hot-pressing is inappropriate sometimes because the dehydrogenation occurs at about 450 K, and the incorporation of large amount of metal as binder often makes the MCE reduce a lot. Here, we report a new way to prepare the metal-bonded LaFe11.4Mn0.3Si1.3Hδ hydride plates as thin as 0.5 mm by metal-binding prior to hydrogenation instead. By adding a small amount 4 wt% of Cu, LaFe11.4Mn0.3Si1.3/Cu plates were firstly prepared. Afterwards, hydrogen absorption can be still conducted because lots of holes and naked surfaces still left, which favor hydrogen atoms into lattice. As a result, saturated hydrogenation can be achieved. The MCE keeps large, and good mechanical properties and thermal conductivity have been demonstrated. [Display omitted] •LaFe11.4Mn0.3Si1.3Hδ/Cu plates as thin as 0.5 mm were prepared by metal-binding prior to hydrogenation.•A small amount 4 wt% of Cu as binder was introduced.•Hydrogen absorption can be still conducted because lots of holes and naked surfaces still left.•Saturated hydrogenation can be achieved. The MCE keeps large.•Good mechanical properties, thermal conductivity, excellent age stability have been demonstrated.