Method of producing a porous electrode material

• Main Author: LINDSTROM OLLE
• Format: Patent
• Language: English
• Published: 19.12.1967
• Subjects: ALLOYS; BASIC ELECTRIC ELEMENTS; CHEMISTRY; ELECTRICITY; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; TREATMENT OF ALLOYS OR NON-FERROUS METALS

A porous electrode material is produced from a "RANEY" type (Trade Mark) alloy powder by leaching out the alkali soluble component such as Al, Mg, Si and Zn, to leave the active powder such as Ni, Co, Fe, Mo, W, Ag, C, which is either maintained in a protective atmosphere, such as nitrogen and compacted in said atmosphere, or the powder may be made non pyrophoric by heat treatment e.g. in nitrogen, or by treatment with an inert gas such as CO2, CH4 or NH3 which is adsorbed, and the non pyrophoric powder may be mixed with up to 25% by weight of ammonium carbonate or bicarbonate and a carrier powder such as inactive Ni, Co, Fe, Mo, W, Ag and C. The compacted powder is sintered in a protective atmosphere e.g. hydrogen, or it may be hot pressed. When the powder is not rendered non pyrophoric the whole process of storage, pressing and sintering or hot pressing is carried out in a protective atmosphere. The sintered material may be used as plates, pellets or grains.ALSO:A porous electrode material is produced from a "RANEY" type (Trade Mark) alloy powder by leaching out the alkali soluble component such as Al, Mg, Si and Zn, to leave the active powder such as Ni, Co, Fe, Mo, W, Ag, C, which is either maintained in a protective atmosphere such as nitrogen and compacted in said atmosphere, or the powder may be made non pyrophoric by heat treatment e.g. in nitrogen, or by treatment with an inert gas such as CO2, CH4 or NH3 which is adsorbed, and the non pyrophoric powder may then be compacted in air. The active powder may be mixed with up to 25% by weight of ammonium carbonate or bicarbonate and a carrier powder such as inactive Ni, Co, Fe, Mo, W, Ag and C. The compacted powder is sintered in a protective atmosphere e.g. hydrogen, or it may be hot pressed. When the powder is not rendered non pyrophoric the whole process of storage, pressing and sintering or hot pressing is carried out in a protective atmosphere. The sintered material may be used as plates, pellets or grains.