Extended surface area amorphous metallic material

Details Extended surface area amorphous metallic material Extended surface area amorphous metallic material

C - Chemistry, Metallurgy

22

F

148/36, 75/1.2

C22F 1/00 (2006.01) B01D 71/02 (2006.01) B01J 37/00 (2006.01) C22C 45/00 (2006.01)

Patent

CA 1246900

ABSTRACT An extended surface area amorphous metallic article and process for preparation thereof, wherein a homogeneous amorphorus metallic alloy is phase-separated to produce two interconnected, internally continuous, amorphous phases, and then one phase is removed. Preferably, the homogeneous metallic alloy has a com- position associated with a eutectic between at least two solid solutions. Phase separation is accomplished by exposing the alloy to a temperature which is below the crystallization temperature and also below the phase separation temperature for that composition. Removal of one phase may be accomplished by leaching in a liquid solution, or by vaporization. The resulting article has an extended surface area of the amorphous phase that is not removed. A porous membrane having extended internal surface area may be prepared by continuing the removal process to the removal of one phase throughout the entire thickness of the article. The extended surface area articles, wherein the extended surface area is of an amorphous metal, enjoy particular advantages when used as catalysts.

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