An alternative route to produce easily activated nanocrystalline TiFe powder
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2018
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International Journal of Hydrogen Energy
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In this paper, an alternative process route to produce active nanocrystalline TiFe compound
was investigated. First, TiH2 and Fe powders were dry co-milled in a planetary ball
mill for 5e40 h. TiH2 was selected as precursor powder, instead of Ti powder, due its
fragility, which has proved to be beneficial to decrease powders adherence on milling tools.
In terms of loose powder mass, milling yields ranged from 90 to 95 wt.%. Next, milled
powders were post-heated at 873 K under dynamic high-vacuum for TiFe synthesis reaction.
First hydrogen absorption was verified in situ during the cooling process of samples
(until the room temperature), being the amount of hydrogen absorbed and desorbed by this
samples measured by automated Sievert's apparatus, under constant hydrogen flow rate of
9 cm3. min-1 (dynamic measurements). Besides to allowing the first absorption in situ, the
investigated process route also allowed the production of the non-stoichiometric TiFe
compound (rich in Ti) in samples milled for shorter times (5 and 10 h), both characteristics
associated with maintaining the mechanical compound activity. Each sample absorbed
hydrogen at 2 MPa during the cooling process, requiring no additional thermal activation
cycles, since the samples milled for shorter times (mainly for 10 h) could absorb hydrogen
for the first time more easily. However, the samples milled for longer times (25 and 40 h)
shown better results in terms of reversible and storage capacities (0.73 and 0.94 wt.%,
respectively).
Como referenciar
FALCAO, R.B.; DAMMANN, EDGAR D.C.C.; ROCHA, C.J.; DURAZZO, M.; ICHIKAWA, R.U.; MARTINEZ, L.G.; BOTTA, W.J.; LEAL NETO, R.M. An alternative route to produce easily activated nanocrystalline TiFe powder. International Journal of Hydrogen Energy, v. 43, n. 33, p. 16107-16116, 2018. DOI: 10.1016/j.ijhydene.2018.07.027. Disponível em: http://repositorio.ipen.br/handle/123456789/29302. 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.