Hydrogen permeation measurements on alumina

TitleHydrogen permeation measurements on alumina
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2005
AuthorsSerra, Emanuele, Bini A.C., Cosoli G., and Pilloni L.
JournalJournal of the American Ceramic Society
KeywordsAlumina, Arrhenius expressions, Ceramic materials, diffusion, Hydrogen, Hydrogen driving pressures, Hydrogen permeation measurements, Solubility, Solubility parameters

The aim of this work is to measure the hydrogen transport and solubility parameters in the commercial alumina. Measurements are conducted using a time-dependent permeation method over the temperature range 1273-1673 K with hydrogen driving pressures in the range 104-105 Pa (100-1000 mbar). A half-power pressure dependence (diffusion-limited permeation) of the permeation flux for alumina is observed. The Arrhenius expressions for the hydrogen permeability, diffusivity, and Sieverts' constant values obtained from a fitting to the whole temperature range are as follows: P = 3.3 · 10-10 exp(-97420/RT) mol · m-1 · s -1 · Pa-1/2 D = 9.7 · 10-8 exp(-79990/RT) m2 · s-1 Ks = 5.5 ·10-3 exp(-22540/RT) mol · m-3 · Pa-1/2.


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