Method for preparing high-performance rebco high-temperature bulk superconductor based on layered precursor pellet

A method for preparing a high-performance rare-earth barium copper oxide (REBCO) high-temperature bulk superconductor based on a layered precursor pellet, comprising:

• obtaining original reagents with preset molar ratios, and preparing original powders by a solid-phase sintering method;
• preparing three types of precursor powder combinations by mixing the original powders with preset molar ratios, wherein the three types of precursor powder combinations comprise first precursor powder, second precursor powder and buffer layer powder, and a proportion of refined particles in the second precursor powder is larger than a proportion of refined particles in the first precursor powder;
• based on a preset REBCO bulk superconductor manufacturing method, pressing and stacking the three types of precursor powder combinations to obtain a combined precursor pellet, and pressing buffer precursor powders to obtain a buffer layer, wherein the combined precursor pellet comprises a second precursor pellet arranged at a bottom and a first precursor pellet coaxially and colaterally placed above the second precursor pellet;
• processing an REBCO original crystal seed, the combined precursor pellet and the buffer layer based on a preset top-seeded melt texture growth method to obtain an initial REBCO high-temperature bulk superconductor;
• and
• performing annealing treatment according to the initial REBCO high-temperature bulk superconductor to obtain a final REBCO high-temperature bulk superconductor.