Ti–Cr–X protium absorbing alloys with high protium content for fuel-cell

• Published in: Journal of alloys and compounds Vol. 356-357; pp. 480 - 485
• Main Authors: Okada, M., Chou, T., Kamegawa, A., Tamura, T., Takamura, H., Matsukawa, A., Yamashita, S.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 11-08-2003
• Subjects: BCC hydrogen absorbing alloys; High hydrogen content; Hydrogen absorbing alloys; Hydrogen alloys tanks for fuel cell; Ti– Cr– Mo alloys; Ti– Cr– Ru alloys; V-free Ti– Cr alloys; Hydrogen absorbing alloys; Ti– Cr– Mo alloys; V-free Ti– Cr alloys; High hydrogen content; Hydrogen alloys tanks for fuel cell; BCC hydrogen absorbing alloys; Ti– Cr– Ru alloys
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/S0925-8388(02)01246-X

The effects of additional elements to the Ti–Cr alloys on their protium absorption–desorption properties were investigated. Although Ti–Cr alloys with a b.c.c. structure is expected to exhibit a high protium content, it is difficult to obtain single b.c.c. phase quenching from the high temperature. The effects of additional elements such as V, Mo, W, Nb, Ta, Ru, Rh, Re, Os, Ir etc. on stabilizing b.c.c. phase in the alloys were investigated. Then, it was found that the additions of V, Mo, W, Ru, Rh, Re, Os, Ir effectively stabilized b.c.c. phases. But the addition of Nb and Ta preferentially formed Laves phases. Specially, the addition of Mo and Ru is effective to stabilize the b.c.c. phases with high protium content. The Ti–Cr–(1∼2.5%)Mo alloys show almost same capacity of protium as that reported in Ti–Cr–(5–7.5)V alloys. The addition of Ru to Ti–Cr alloys also shows the capacity of 3.0 mass% protium. These V-free Ti–Cr alloys will be also suitable for the future applications.