Electroplating of superconductor elements
AssigneeHauser Chemical Research, Inc.
InventorsRay L. Hauser, Bolin Zheng, Michael Renbarger, Mark A. Lange
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Abstract
Processes and techniques are described for concurrent electroplating of yttrium, barium and copper from aqueous solution onto a desired substrate (e.g., nickel, nichrome or silver). Compounds of these elements are dissolved in aqueous solution with a complexing agent meeting defined criteria and then are placed in a plating cell in which the cathode is the substrate on which the elements are to be deposited. After the elements have been deposited, they are oxidized to provide the desired perovskite structure. The process may be continuous or non-continuous.
Claims24
A process for concurrent electroplating of yttrium, barium and copper elements from aqueous solution onto an electrically conductive substrate comprising the steps of:
- (a) dissolving compounds of said elements in water containing complexing agent and adjusted to a pH of 5 or less, said complexing agent is selected from the group consisting of picolinic acid, ethylenediamine-N,N'-diacetic acid, diethylenetriamine pentaacetic acid, 1,3-diamino-2-hydroxypropane-N,N,N',N'-tetraacetic acid, nitrilotriacetic acid, triethylenetetra-amine hexaacetic acid, N-(2-hydroxyethyl)ethylenediamine triacetic acid, 1,3-acetonedicarboxylic acid, 2-nitrobenzoic acid, or a salt thereof;
- (b) inserting an anode and a cathode into said solution;
- wherein said cathode comprises said substrate;
- and
- (c) creating an electrical potential on said cathode at -0.5 volts or less with a current density of at least about 15 mA/cm.sup.2 to cause electrodeposition of said elements onto said cathode.
A process for continuous production of superconductive ribbon comprising the steps of:
- (a) electroplating yttrium, barium and copper elements on a moving metallic ribbon
- (i) dissolving compounds of said elements in water containing a complexing agent and adjusted to a pH of 5 or less, said complexing agent is selected from the group consisting of picolinic acid, ethylenediamine-N,N'-diacetic acid, diethylenetriamine pentaacetic acid, 1,3-diamino-2-hydroxypropane-N,N,N',N'-tetraacetic acid, nitrilotriacetic acid, triethylenetetra-amine hexaacetic acid, N-(2-hydroxyethyl)ethylenediamine triacetic acid, 1,3-acetonedicarboxylic acid, 2-nitrobenzoic acid, or a salt thereof;
- (ii) inserting an anode and a cathode into said solution;
- wherein said cathode comprises said substrate;
- and
- (iii) creating an electrical potential on said cathode at -0.5 volts or less with a current density of at least about 15 mA/cm.sup.2 to cause electrodeposition of said elements onto said cathode and then,
- (b) oxidizing said elements by passing said ribbon through a furnace including an atmosphere containing oxygen.
Dependencies are inferred from the claim text.