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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
Estimating the term…
Disclosed is a three layer process for making contact points to a high transition temperature superconductor (HTSC), particularly to (Bi,Pb)2 Sr2 Ca2 CU3019+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 contact made by a process comprising the steps of:
A contact made by a process comprising the steps of making a groove at the end of a superconductor, depositing a first silver layer by metal spray gun at a temperature of 120° C., heating the 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 heat treated first silver layer, depositing a second silver layer by metal spray gun at a temperature of 120° C., heating the 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, wherein the contact resistance is in a range of 1.5×10−8 to 8.5×10−8Ω in zero applied magnetic field at 4.2K.
Dependencies are inferred from the claim text.