Effect of surface and bulk properties on hydrogen absorption and desorption in NiZr metallic glasses

• Autorzy: Vehovszky B. , Balla S.
• Języki publikacji: EN

Abstrakty

EN

After previous examinations in the field of Ni-Zr based hydrogen absorbing glassy alloys, this paper details some surface and bulk processes, which have strong influence in H-charging and discharging properties. It is a usual problem with hydrogen storing materials that imperfect surface and bulk preparation (activation) hinders free movement of hydrogen, thus we can use only a small proportion of theoretical storing capacity. The surface oxide layer is usually a fundamental point: it is often impermeable for hydrogen. It is also true for Ni-Zr based glassy alloys, so the surface of samples has to be activated first by etching in an adequate acetic solution. Another restricting process is the diffusion of H-atoms in bulk metal. This problem is also examined and discussed together with some special measurements that made us able to study the above-mentioned effects easily.

Słowa kluczowe

EN

hydrogen storage; Ni-Zr based glassy alloy; surface oxide layer; surface and bulk activation

PL

magazynowanie wodoru; szkła metaliczne

• Wydawca: Oficyna Wydawnicza Uniwersytetu Zielonogórskiego
• Czasopismo: International Journal of Applied Mechanics and Engineering
• Rocznik: 2010
• Tom: Vol. 15, no 2
• Strony: 463--468
• Opis fizyczny: Bibliogr. 6 poz., rys., wykr.

Twórcy

autor

Vehovszky B.

autor

Balla S.

• Budapest University of Technologies and Economics Bertalan L. u. 2, Z 608, 1111 Budapest, HUNGARY,

Bibliografia

• Garaguly J. (1998): Examination of Hydrogen Absorption-desorption in Amorphous Alloys via In-situ Resistance Measurement – PhD thesis, Budapest.
• Hao Gu, Yunfeng Zhu and Liquan Li (2009): Hydrogen storage properties of Mg–30 wt.% LaNi5 composite prepared by hydriding combustion synthesis followed by mechanical milling (HCS + MM). – International Journal of Hydrogen Energy, vol.34, No.3, pp.1405-1410.
• Manchester D. and Khatamian D. (1988): Mechanis for activation of intermetallic hydrogen absorbers. – Mat. Sci. For., vol.31, pp.261-296.
• Shang C.X., Bououdina1 M., Song Y. and Guo Z.X. (2004): Mechanical alloying and electronic simulations of (MgH2+M) systems (M=Al, Ti, Fe, Ni, Cu and Nb) for hydrogen storage. – International Journal of Hydrogen Energy, vol.29, pp.7380.
• Vehovszky B. and Balla S. (2008): The effect of hydrogen charging and discharging in Zr(Ni,Pd,Pt,Cu) glasses. – Materials Engineering, Žilina, vol.15, No.2a, pp.1-6, ISSN 1335-0803.
• Vehovszky B. and Balla S. (2009): Resistometric and volumetric monitoring of hydrogen-absorption-desorption processes in Ni-Zr based metallic glasses. – Journal of Machine Manufacturing, vol. XLIX, Issue E3-E5, pp.35-38, HU ISSN 0016-8580, Budapest.