Preparing Magnetocaloric LaFeSi Uniform Microstructures by Spark Plasma Sintering

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

Research output: Contribution to journalConference articleResearchpeer-review

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.
Original languageEnglish
JournalMaterials Science Forum
Volume802
Pages (from-to)491-495
Number of pages5
ISSN0255-5476
DOIs
Publication statusPublished - 2014
Event9th International Latin American Conference on Powder Technology (PTECH 2013) - Sao Paulo, Brazil
Duration: 27 Oct 201329 Oct 2013
Conference number: 9

Conference

Conference9th International Latin American Conference on Powder Technology (PTECH 2013)
Number9
Country/TerritoryBrazil
CitySao Paulo
Period27/10/201329/10/2013

Keywords

  • SPS
  • Magnetocaloric
  • Microstructure
  • Spark Plasma Sintering
  • LaFeSi

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