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AssigneeCouncil of Scientific and Industrial Research
InventorsShrikant Ekbote, Gursharan Kaur Padam, Narendra Kumar Arora, Mukul Sharma, Ramesh Sethi, Mrinal Kanti Banerjee
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Disclosed is a three layer process for making contact points to a high transition temperature superconductor (HTSC), particularly to (Bi,Pb)2Sr2Ca2Cu3O19+x with and without silver in the superconductor. The contact structure is a three layer configuration with a perforated silver foil (3) sandwiched between two metal spray gun deposited silver layers (2,5) and subsequent heat treatment in air. The contact has been made on tubes and rods (1). The silver contacts are capable of carrying a continuous current of 200 Amps without adding any substantial heat load to the cryogen used to cool the HTSC. The contact resistance at 4.2 K is in the range of 1.5×10 (hoch−8) to 8.5″ 10 (hoch−8)OHM in zero applied filed.
A process for the preparation of a low contact resistance contact on a high transition temperature superconductor which comprises making a groove at the end of the superconductor, depositing a first silver layer by metal spray gun at a temperature 120° C., heating the said deposited silver layer at a temperature in a range of 200-250° C. for a time period in the range of 2-5 hrs, wrapping a perforated silver foil on the said heat treated first silver layer, depositing a second silver layer by metal spray gun at a temperature of 120° C., heating the said combination of first silver layer, wrapped perforated silver foil and second silver layer at a temperature in a range of 830-850° C. in air for a time period in the range of 100-150 hrs resulting in a joint with the superconductor.
Dependencies are inferred from the claim text.