Mechanical activation of TiFe for hydrogen storage
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2019
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BRAZIL MRS MEETING, 18th
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The aim of this work is to report some recent developments on the synthesis of
TiFe by high energy ball milling and cold rolling, concerning hydrogen storage.
Ball-milled TiFe was produced by two procedures, both under inert atmosphere
and with various milling times. In the first one a powder mixture of TiH2 an Fe
was milled, followed by a vacuum heat treatment to promote the reaction
synthesis of TiFe compound [1]. Second procedure consisted of milling Ti and Fe
powders with stearic acid (as a process control agent) after a pre-milling
operation (with the same powders and without PCA) to prepare the surface of
milling media. Both methods were conceived for avoiding strong adherence of the
powders to the milling balls and vial, impairing the mechanical alloying. Cold
rolling was performed on a ground TiFe ingot produced by arc melting [2]. After
20 to 40 passes under inert atmosphere, powder particles and thin cracked flakes
were produced.
Results showed that both milling procedures succeeded in avoiding unacceptable
adherence to the milling media, with high loose powder yields. Whatever the
route, nanostructured TiFe was obtained with no need of further thermal
activation for the first hydrogenation. Hydrogen absorption capacities of about
1.0 wt% at room temperature was obtained with both milling procedures. Higher
capacity (1.4wt%) was obtained with cold rolled TiFe (powder and flakes) after 40
passes. Some possible explanations for this difference are presented and
discussed.
Como referenciar
LEAL NETO, RICARDO M.; VEGA, LUIS E.R.; FALCÃO, RAILSON B.; LEIVA, DANIEL R.; ROCHA, CLAUDIO J.; ISHIKAWA, TOMAZ T.; KIMINAMI, CLAUDIO S.; BOTTA, WALTER J. Mechanical activation of TiFe for hydrogen storage: ball milling x cold rolling. In: BRAZIL MRS MEETING, 18th, September 22-26, 2019, Balneário Camburiú, SC. Abstract... São Carlos, SP: Aptor Software, 2019. p. 49-50. Disponível em: http://repositorio.ipen.br/handle/123456789/31043. Acesso em: 13 May 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.