MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Protium Absorption/Desorption Characteristics of Mg2Ni/LaNi5 Composite
Hayato OkumuraAkihiro MatsuiShintaro YamagiwaShigeharu KamadoYo Kojima
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2002 Volume 43 Issue 11 Pages 2728-2733

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Abstract

In this study, an attempt is made to form composites by mechanical alloying (MA) or pulse-electric-current-sintering (PECS) for utilization of synergy effect to acquire both high capacity and ability to absorb/desorb protium at low temperatures. The composites have well-bonded structure consisting of Mg2Ni alloy that has high hydrogenation capacity and LaNi5 alloy that is capable of protium absorption/desorption at relatively low temperatures. During the absorption process, the protium content of MA+PECS and MA specimens at 80°C is over the theoretical value corresponding to the ratio of LaNi5 phase. After absorption of the maximum protium content at 40°C by MA+PECS specimen, the desorption process was evaluated by TG/DTA analysis and the specimen starts desorbing protium at about 100°C. Consequently, the result suggests the occurrence of synergy effect during the absorption/desorption process of the obtained composites.

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© 2002 The Japan Institute of Metals and Materials
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