Preparing Magnetocaloric LaFeSi Uniform Microstructures by Spark Plasma Sintering

N. Vicente; J. Ocanã; H.N. Bez; C.S. Teixeira; Izabel Fernanda Machado; P.A.P. Wendhausen

doi:10.4028/www.scientific.net/MSF.802.491

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HomeMaterials Science ForumMaterials Science Forum Vol. 802Preparing Magnetocaloric LaFeSi Uniform...

Preparing Magnetocaloric LaFeSi Uniform Microstructures by Spark Plasma Sintering

Abstract:

Spark Plasma Sintering (SPS) of LaFeSi alloy powders was conducted to prepare magnetocaloric La-Fe-Si-based uniform microstructures. Two electrically insulating discs made of alumina were interposed between the punches and powder sample inhibiting the flow of electric current across the powder. This approaching aiming at improving the sample temperature distribution by deviating the electric current throughout the graphite die, since the electric current induces overheating by in situ Joule effect on powder. The LaFeSi powder with particles under 150 µm was obtained by mechanical milling of particles from hydrogenated and decrypted casting ingot. The characterizations of sintered samples were performed by Scanning Electron Microscopy (SEM), Archimedes principle, Vicker’s hardness and microhardness. The uniformity of the microstructure was evaluated by checking the evidence of position on the Vicker’s microhardness by means of ANOVA statistics.

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Periodical:

Materials Science Forum (Volume 802)

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491-495

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.802.491

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Online since:

December 2014

Authors:

N. Vicente*, J. Ocanã, H.N. Bez, C.S. Teixeira, Izabel Fernanda Machado, P.A.P. Wendhausen

Keywords:

LaFeSi, Magnetocaloric, Microstructure, Spark Plasma Sintering, SPS

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