Centre National De La Recherche Scientifique

Office National D'etudes Et De Recherches Aerospatiales

Areva Gmbh

Armines

Societe Des Ceramiques Techniques

Philippe Colomban

Gilles Courtemanche

Michel Parlier

Patrice Goeuriot

Baroudi Benjeriou-Sedjerari

Kamal Rahmouni

Emmanuelle Mouchon

Stéphanie Willemin

Béatrice Sala

Olivier Lacroix

Martine Menet

Hisasi Takenouti

Arie Van Der Lee

The invention relates to a method for optimizing the conductivity provided by the displacement of H+ protons and/or OH&#x2212; ions in a conductive membrane made of a material permitting the insertion of steam into said membrane, wherein said method comprises the step of inserting under pressure gaseous flow containing the steam into said membrane in order to force said steam into said membrane under a certain partial pressure so as to obtained the desired conductivity at a given temperature, said partial pressure being higher than or equal to 1 bar, a drop in the operational temperature being compensated by an increase in said partial pressure in order to obtain the same desired conductivity. The invention can be used in particularly interesting applications in the fields of high-temperature water electrolysis for producing hydrogen, of the manufacture of fuel cells using hydrogen fuel, and of hydrogen separation and purification.

Method for optimizing the conductivity provided by the displacement of H+ protons and/or OH- ions in a conductive membrane

Woven or nonwoven long fiber sheets filled with two precursors each constituting an intermediate stage in a process for the preparation of a vitreous ceramic composition by the sol-gel route by hydrolysis and polycondensation using alcoholates or analogous compounds as the starting materials, that is to say an interface precursor in the form of a gel rich in water and a matrix precursor in the form of discrete particles capable of sintering at relatively low temperature, are stacked; the fibrous structure is compressed in the direction of stacking and the whole is heat-treated in order to convert the two precursors into a continuous matrix.

Multilayer fiber-matrix ceramic composite material and process for its

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Fresnes, France

Philippe Colomban