Aluminum Company of America

Alcoa Inc.

Robert W Woods

Siba P Ray

Robert K Dawless

Robert B Hosler

Israel Stol

Frankie E Phelps

David H DeYoung

S John Pien

John D Weyand

Gerald W Leech

Rabindra K Bhattcharyya

A cermet composite material is made by treating at an elevated temperature a mixture comprising a compound of iron and a compound of at least one other metal, together with an alloy or mixture of copper and a noble metal. The alloy or mixture preferably comprises particles having an interior portion containing more copper than noble metal and an exterior portion containing more noble metal than copper. The noble metal is preferably silver. The cermet composite material preferably includes alloy phase portions and a ceramic phase portion. At least part of the ceramic phase portion preferably has a spinel structure.

Inert electrode containing metal oxides, copper and noble metal

A coupling for an inert electrode for refining a metal is provided. The coupling includes an electrode assembly and an electrically conductive support structure assembly. The support structure assembly includes a mechanical connection and an electrical connection which are in spaced relation. The mechanical connection holds the electrical connection in compression.

Electromechanical attachment of inert electrode to a current conductor

An inert electrode material is made by reacting at an elevated temperature a mixture preferably comprising iron oxide, at least one other metal oxide, copper and silver. The reaction produces a material having ceramic phase portions and alloy phase portions, wherein the alloy phase portions have copper-rich interior portions and silver-rich exterior portions. Inert anodes made with a reaction mixture containing copper and silver have lower wear rates than inert anodes made with copper and no silver.

Electrolysis with a inert electrode containing a ferrite, copper and

A process for making an inert electrode composite wherein a metal oxide and a metal are reacted in a gaseous atmosphere at an elevated temperature of at least about 750.degree. C. The metal oxide is at least one of the nickel, iron, tin, zinc and zirconium oxides and the metal is copper, silver, a mixture of copper and silver or a copper-silver alloy. The gaseous atmosphere has an oxygen content that is controlled at about 5-3000 ppm in order to obtain a desired composition in the resulting composite.

Controlled atmosphere for fabrication of cermet electrodes

A .beta.'SiAlON produced from initial reactant materials comprising Al.sub.2 O.sub.3, and carbon that produces a .beta.'SiAlON material having a strength greater than about 50 ksi at approximately 1000.degree. C. In a preferred embodiment of the invention the .beta.'SiAlON material has a strength greater than about 50 ksi at approximately 1200.degree. C. In a second embodiment of the present invention is a low-cost process for producing unsintered high purity alpha silicon nitride structured SiAlON by carbothermic reaction from initial reactant materials comprising Al.sub.2 O.sub.3, SiO.sub.2 and carbon.

Process for producing nonequiaxed silicon aluminum oxynitride

An inert electrode connection is disclosed wherein a layer of inert electrode material is bonded to a layer of conductive material by providing at least one intermediate layer of material therebetween comprising a predetermined ratio of inert material to conductive material. In a preferred embodiment, the connection is formed by placing in a die a layer of powdered inert material, at least one layer of a mixture of powdered inert material and conductive material, and a layer of powdered conductive material. The connection is then formed by pressing the material at 15,000-20,000 psi to form a powder compact and then densifying the powder compact in an inert or reducing atmosphere at a temperature of 1200.degree.-1500.degree. C.

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New Kensington, PA, United States of America

Robert W Woods