Recent Progress in Second-Generation HTS Wire Technology at Superpower
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1099-II01-02
RECENT PROGRESS IN SECOND-GENERATION HTS WIRE TECHNOLOGY AT SUPERPOWER Yimin Chen, Xuming Xiong, Yiyuan Xie, Yunfei Qiao, Xun Zhang, Andrei Rar, Maxim Martchevskii, Robert Schmidt, Kenneth Lenseth, John Herrin, Drew Hazelton, and Venkat Selvamanickam SuperPower Inc, 450 Duane Ave, Schenectady, NY, 12304 ABSTRACT We report recent progress in 2G-HTS wire technology at SuperPower Inc. The throughputs of 4mm-wide tape have reached 750m/h for sputtering Al2O3+Y2O3 base layer, 360m/h for IBAD MgO template, 345m/h for sputtering Homo-epi MgO+LMO buffer, 180m/h for MOCVD REBCO. Critical current (Ic) of 813A/cm-width at 77K and self-field has been achieved on 1 meter length of 12mm-wide tape. In-field performance has been significantly improved through composition modification, doping and MOCVD condition optimization. Ic of 185.6A/cm-width at 77K and 1Tesla has been obtained. For Ic on long lengths, 314A/cm-width on 202m, 221A/cm-width on 610m and 170A/cm-width on 935m have been achieved. A coil of 19.1mm diameter that we made with our 2G wires generated 26.8T magnetic field. A 30m-long cable made with nearly 10,000 meters of SuperPower 2G wires showed excellent overall performance and has been installed and energized in the power grid. 1. INTRODUCTION In order to improve the price-performance characteristics of 2G HTS wires and qualify them for the applications in electrical transmission, motors, generators, magnets and fault current limiters, the manufacturing technology should be further developed to meet key metrics: critical current, magnetic field properties, single-piece length and processing throughput [1-6]. Critical current of above 500A/cm is desired for 2G-HTS wires for several applications. In high power motors or generators, high critical currents in the operational regime of magnetic field and temperature are expected. Single-piece lengths in the kilometer range are desired for several applications. Process throughput needs to be high enough to enable a manufacturing capacity of about 1000km/year of the 4mm-wide wires. This paper reviews recent progress made at SuperPower Inc in the four key metrics. 2. HIGH THROUGHPUT PROCESSES FOR LONG LENGTHS Table 1 displays a typical architecture of 2G HTS wires made at SuperPower, Inc. The column on the left in the table is the architecture and the column on the right of the table names the process methods for the layers. Shown in Table 2 are the process throughputs for key steps. The tape lengths have increased to over 1.3km. 50μm is our standard nickel-alloy-substrate thickness, which enables high engineering current density (Je) in addition to excellent mechanical properties. We also produce some tapes of 100μm thick for some specific applications such as fault current limiters. The parent tape width is 12mm and can be slit into three 4mm-wide wires. Our electrochemically polished (EP)
nickel-alloy substrates have a surface roughness smaller than 2nm, and are smooth enough for high quality IBAD film coating. In the IBAD MgO based buffer system, every l
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