METHOD FOR MANUFACTURING OF SUPERCONDUCTING ITEM Russian patent published in 2012 - IPC H01L39/00 H01P7/06 

FIELD: electricity.

SUBSTANCE: metal base from nickel, cobalt, copper or alloy of these metals is formed by sheet stamping. A multilayer coating containing a protective layer from chrome, molybdenum or tungsten, a superconducting layer from niobium or niobium stannide, a stabilising layer from tantalum or its alloy with niobium and a support heat-conducting copper layer are serially applied by electrochemical deposition onto the outer surface of the superconducting item base. After application of the protective layer it is exposed to mechanical polishing to provide for surface purity of 0.1 mcm and less. The superconducting layer of the item is applied by deposition from a melt of alkaline metals halogenides salts and salts of niobium or niobium and tin at the temperature of 750-850°C and cathode density of current 100-500 A/m². After polishing of the superconducting layer the item is exposed to annealing in vacuum at 500-900°C.

EFFECT: reduced surface resistance of volume resonators at high frequencies and higher quality, lower level of energy losses from currents of field emission.

7 cl, 6 ex, 1 dwg, 1 tbl