Development of 50-Meter RE-Ba-Cu-O Tapes With Critical Current Over 1750 A/12mm at 65 K, 0.25 T by Advanced-MOCVD

REBCO tapes have an immense potential in next-generation electric machines such as high-efficiency industrial motors, high-power wind turbine generators, and electric aircraft . We have constructed a pilot-scale advanced metal organic chemical vapor deposition ( A-MOCVD) manufacturing tool to produce 50-meter-long REBCO tapes with film thickness over 4 μm in a single pass. Furthermore, the composition of these REBCO tapes with 5% Zr dopant has been optimized for high critical current in low magnetic fields at 65 K, specifically for use in an industrial motor. Several 50-meter-long tapes with 4+ μm thick films and 5% Zr have been fabricated with uniform critical current ( I_c ) over 1,750 A/12 mm at 65 K, 0.25 T. The critical current of all tapes has been examined over their entire length by scanning hall probe microscopy at 77 K, 0 T. The tapes were slit and copper plated to 4 mm wide strands to fabricate and test a rotor coil for a 500 HP motor.