Little Information of Alumina Ceramic large Ring, Plate

Alumina ceramic large ring, plate has high temperature resistence, high strength, and corrosion resistance, as wll as good insulation properties. Alumina ceramic large ring, plate is mainly used for high-temperature sintering equipment, mechanical insulation voltage equipment and machinery wear-resistant equipment.
In order  to verify a feasibility of a high voltage bushing for the ITER NB system,  development  of brazing technique of a meter-class ceramic ring, manufacturing and voltage holding test of a full-size single-stage mockup were performed in JAEA. To satisfy mechanical strength and voltage holding capability required on the bushing,  design  modifications based on  mechanical  and  electric  field analyses were applied to  the full-size mockup. Results of high voltage test showed a stable voltage holding for over voltage at -240 kV for two hours and a long period operation at -220 kV for five hours, which was a first demonstration of high voltage insulation required in the ITER NB system.

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