The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 24, 1983
Filed:
Dec. 09, 1981
Thomas J Gray, Guilford, CT (US);
Olin Corporation, New Haven, CT (US);
Abstract
An improved cathode with a conductive metal core and a Raney nickel type catalytic surface predominantly derived from an adherent Beta (NiAl.sub.3) crystalline precursory outer portion of the metal core is disclosed. The precursory outer portion contains nickel, tantalum, and aluminum to give a precursor alloy having the formula (NiTa)Al.sub.3 where the tantalum content of the nickel-tantalum portion is in the range of from about 5 to about 25 weight percent. Also disclosed is a method of producing a low overvoltage cathode which includes the steps of coating a nickel-tantalum core or substrate having from about 5 to about 25 percent by weight of tantalum with molten aluminum and heat treating the coated substrate to form a (NiTa)Al.sub.3 ternary alloy with predominantly a Beta crystal structure on the outer portion. An alkali metal hydroxide is used to leach out aluminum and produce a porous binary Raney Ni-Ta alloy surface. The resulting porous binary alloy-coated substrate is useful as a cathode in electrolytic cells, particularly in membrane cells utilized to produce chlorine and caustic from brine.