Fabrication of Alumina Coating on Ni-Al Alloy Microchannel Wall for Catalyst Supporting

High-temperature oxidation of the inner wall of a microchannel has been examined in order to fabricate an oxide coating for catalyst supporting. The microchannel was produced in a nickel body by a powder metallurgical microchanneling process, and it was lined with a NiAl intermetallic alloy layer. By high-temperature oxidation, an alumina scale was fabricated on the surface of the microchannel lining layer. In some cases, the alumina scale had a needle-like structure on its surface.