Synthesis by high-energy ball milling of MgH2-TiFe composites for hydrogen storage
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2017
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Materials Science Forum
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The aim of this work is to investigate the influence of some processes variables on the
microstructure and hydrogen absorption kinetics of MgH2 - X wt.% TiFe composites. Samples were
synthesized by high-energy ball milling in a planetary (X = 40, 50, 60) and shaker mill (X = 40)
under high-purity argon atmosphere. Commercial MgH2 instead of Mg powder was used in order to
reduce adherence on the vial and balls. TiFe powder was previously produced by ball milling a
mixture of TiH2 and Fe powders followed by a reaction synthesis at 600ºC. Milled composites
samples were characterized by XRD and SEM analysis. Milling time was preliminary investigated
(X = 40) in the planetary ball mill (6 to 36h). TiFe particle size reduction was shown to be difficult
since they are surrounded by MgH2 matrix. Strong particle reduction was obtained by using a
shaker mill only for 2 hours and adding cyclohexane as process control agent. No reaction between
MgH2 and TiFe compound was observed in any milled sample. Hydrogen absorption kinetics
measurements of the as-milled samples were conducted on an Sieverts' type apparatus at room
temperature after hydrogen desorption at 350ºC under vacuum. The best hydrogen kinetics (3 wt%
at the first hour) was attained by the planetary milled sample (36 h). Higher hydrogen capacity was
observed for the sample milled in the shaker mill (4.0 wt.%), but only after 13h.
Como referenciar
LEAL NETO, RICARDO M.; SILVA, RAFAEL de A.; FLORIANO, RICARDO; COUTINHO, GRAZIELE C.S.; FALCAO, RAILSON B.; LEIVA, DANIEL R.; BOTTA, WALTER J. Synthesis by high-energy ball milling of MgH2-TiFe composites for hydrogen storage. Materials Science Forum, v. 899, p. 13-18, 2017. DOI: 10.4028/www.scientific.net/MSF.899.13. Disponível em: http://repositorio.ipen.br/handle/123456789/27919. Acesso em: 25 Apr 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.