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Sol-gel-Derived \hbox {Al}_{2}\hbox {O}_{3}{-} \hbox {SiO}_{2} Composite Coating for Electrical Insulation in HTS Magnet Technology

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8 Author(s)
Kandel, H. ; Nat. High Magn. Field Lab., Florida State Univ., Tallahassee, FL, USA ; Jun Lu ; Jianyi Jiang ; Ke Han
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Electrically insulating Al2O3-SiO2 thin coatings have been deposited on long-length 316 stainless steel (SS) tape using a reel-to-reel continuous solgel dip coating process for cowinding insulation into YBCO pancake coils, a high-temperature superconductor magnet technology. Coatings with a thickness of ~ 5 μm are achieved after just two dips with a tape withdrawal speed of ~ 8 mm/s (0.5 m/min) and a calcination at 700 °C. The coatings are measured to have a room-temperature breakdown voltage of ~ 200 V, corresponding to a dc dielectric strength of about 40 MV/m. Consequently, this process has low cost and high throughput and produces a thin electrical insulation with excellent thermal, dielectric, and mechanical properties. A new technique has been developed in the coating process to mitigate Al2O3 particulate aggregation and coating buildup along the edges of the SS tape.

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Applied Superconductivity, IEEE Transactions on  (Volume:22 ,  Issue: 5 )