Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1980-03-27
1981-10-13
Stallard, W.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 05AA, 75 05AB, 75251, C22B 6100
Patent
active
042946085
ABSTRACT:
A method of making substantially oxide-free metal alloys is described. The alloys are made by a hot alkaline reduction of compounds of at least two metals, such as the halides of the metals dissolved in an aqueous medium containing a reducing agent. The dissolved metal compounds containing a first reducing agent are added to a second reducing agent, in a alkaline medium, and the substantially oxide-free, finely-divided alloy precipitates from solution. The alloy has a unique X-ray diffraction pattern indicating that it is a true alloy with no metal oxides present. In a preferred embodiment, ruthenium and platinum chlorides are dissolved in water containing a dissolved reducing agent. This solution is added to a second reducing agent in an alkaline medium at elevated temperatures, and a finely-divided black precipitate of a true alloy of ruthenium and platinum forms. The X-ray diffraction pattern shows a distorted ruthenium structure having platinum in solid solution. Oxygen evolution catalysis was substantially improved in an electrochemical cell having a catalytic cathode made of this alloy of platinum and ruthenium.
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Lawrance Richard J.
Sedlak John M.
Blumenfeld I. David
General Electric Company
Stallard W.
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