Ion conducting ceramic membrane and surface treatment

Details Ion conducting ceramic membrane and surface treatment Ion conducting ceramic membrane and surface treatment

C - Chemistry, Metallurgy

25

B

C25B 13/00 (2006.01) B01D 17/06 (2006.01) B01D 53/22 (2006.01) B01D 53/32 (2006.01) B01D 69/00 (2006.01) B01D 71/02 (2006.01) B05D 3/04 (2006.01) C01B 13/02 (2006.01) C25C 1/10 (2006.01)

Patent

CA 2403459

The present invention provides an ion conducting ceramic membrane selectively permeable to a gas, for instance oxygen and a method of treating such a membrane to improve permeation through the membrane. The membrane is formed by a mass of a substance through which ions of the gas migrate. The mass has two opposed surfaces where dissociation and ionization of the gas occurs and gas ions release electrons and recombine to form molecules of the gas, respectively. At least one of said two opposed surfaces is treated by a removal of surface material to produce surface irregularities of increased area and therefore an increase in total surface area of a treated surface to in turn increase permeation of the gas. Preferably, both surfaces of the membrane are treated by chemical etching techniques, although sand blasting and ion etching are other possible surface treatments in accordance with the present invention.

La présente invention concerne une membrane céramique conductrice d'ions sélectivement perméable à un gaz, par exemple l'oxygène, et un procédé de traitement d'une telle membrane afin d'améliorer la perméation au travers de cette membrane. La membrane est formée d'une masse d'une substance à travers laquelle les ions du gaz migrent. Cette masse présente deux surfaces opposées sur lesquelles le gaz subit une dissociation et une ionisation, et les ions du gaz relâchent des électrons et se recombinent afin de former des molécules du gaz. Au moins une des deux surfaces opposées est traitée par retrait du matériau surfacique afin de produire des irrégularités de surface plus importantes, et d'obtenir par conséquent une augmentation de la zone de surface totale d'une surface traitée permettant d'augmenter la perméation du gaz. Les deux surfaces de la membrane sont de préférence traitées par des techniques de gravure chimique, la gravure au sable et la gravure ionique faisant également partie des traitements surfaciques selon l'invention.

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