CPC C04B 35/4504 (2013.01) [C04B 35/6262 (2013.01); C04B 35/62615 (2013.01); C30B 29/225 (2013.01); H10N 60/857 (2023.02)] | 10 Claims |
1. A method for making a superconducting wire or tape based on a YBCO superconductor matrix, comprising:
mixing powders of yttrium (III) oxide, barium carbonate, and copper(II) oxide then pelletizing to form a pelletized mixture;
calcining the pelletized mixture at a first temperature in the range 850-900° C. for to form a first calcined mixture;
grinding the first calcined mixture to form a first intermediate calcined mixture, then
calcining the first intermediate calcined mixture at a temperature in the range 850-900° C. to form a second calcined mixture, wherein the second calcined mixture is free from carbonate;
ball milling the second calcined mixture at a ball to powder ratio of 5:2 to produce a ball milled sample;
sintering the ball milled sample at a second temperature in the range 900-1000° C. to form a polycrystalline Y3Ba5Cu8Oy material; and
forming the superconductor wire or tape from the polycrystalline Y3Ba5Cu8Oy material;
wherein the polycrystalline Y3Ba5Cu8Oy material is in the form of elongated crystals having an average length of 2 to 10 μm and an average width of 1 to 2 μm, and are embedded with spherical nanoparticles of yttrium deficient Y3Ba5Cu8Oy having an average diameter of 5 to 20 nm, wherein the spherical nanoparticles are in the form of flower-like agglomerates having an average particle size of 30 to 60 nm.
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