METHOD FOR METALLIZING SUPERCONDUCTING MATERIAL INTO SURFACE OF SUBSTRATE BY USE OF PLASMA PHENOMENON

摘要

A method for metallizing a superconducting material onto a surface of a substrate by the use of the plasma phenomenon, which comprises the steps of: continuously supplying an operating gas containing an oxygen gas in an amount of at least 30 vol.% into a bore of a metallizing nozzle from a rear end portion thereof; continuously supplying powder of a composite oxide superconducting material containing a CuxOy radical into the bore of the metallizing nozzle from a tip portion thereof; producing an electric arc in the bore of the metallizing nozzle to convert the operation gas into a high-temperature plasma; melting the powder of the superconducting material supplied into the bore by means of the operating gas converted into plasma; uniformly blowing the thus melted powder of the superconducting material from the metallizing nozzle onto a surface of a substrate by means of a jet of the operating gas converted into plasma to form a film of the superconducting material onto the surface of the substrate; and heating the thus formed film of the superconducting film to a temperature of at least 700 DEG C, and then slowly cooling the thus heated film to the room temperature at a cooling rate of up to 40 DEG C/minute.