Hydrogen separator and process for production thereof
AssigneeNGK Insulators, Ltd.
InventorsKen-ichi Noda, Osamu Sakai
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Abstract
A hydrogen separator comprising a porous substrate composed mainly of a ceramic having a large number of pores connecting from one surface of the substrate to other surface, and a hydrogen-separating layer made of a hydrogen permselective metal formed on the porous substrate via an intermediate layer made of an electron-conductive ceramic. The hydrogen separator hardly generates defects such as peeling, cracks or the like in the hydrogen-separating layer and is suitable for use even when the hydrogen separator is exposed to a heat cycle, used under high temperature conditions or/and used for long-term.
Claims13
A hydrogen separator comprising:
- a porous substrate composed mainly of a ceramic having a large number of pores communicating from one surface of the substrate to other surface, and
- a hydrogen-separating layer made of a hydrogen permselective metal formed on the porous substrate, via an intermediate layer made of an electron-conductive ceramic which is zinc oxide,
- wherein the intermediate layer has a thickness between 0.01 μm and 0.5 μm, and the hydrogen-separating layer has a thickness between 1 μm to 5 μm,
- wherein the intermediate layer is directly bonded to the porous substrate so as not to fill the pores of the porous substrate.
A process for producing a hydrogen separator comprising:
- providing a porous substrate composed mainly of a ceramic having a large number of pores connecting from one surface of the substrate to other surface;
- forming an intermediate layer made of an electron-conductive ceramic, which is zinc oxide, on the one surface of the porous substrate, wherein the intermediate layer is directly bonded to the porous substrate so as not to fill the pores of the porous substrate;
- forming a hydrogen-separating layer on the surface of the intermediate layer, wherein the hydrogen-separating layer is made of a hydrogen permeselective metal;
- wherein the intermediate layer has a thickness between 0.01 μm and 0.5 μm, and the hydrogen-separating layer has a thickness between 1 μm and 5 μm.
Dependencies are inferred from the claim text.