Mr. Shuheng Lin - M.Sc. Candidate
02/03/2025
ZOOM
13:30 - Jerusalem time / 19:30 - Beijing time
Varistor is a critical device protecting an electric module or system from failures due to a surge voltage or electrostatic discharge. The electrical resistance of varistor varies with the applied voltage. ZnO varistors are multi-phase, polycrystalline, doped, metal oxide and solid-state ceramics. ZnO and other metal oxide additives such as antimony, bismuth, cobalt, manganese and nickel etc, are produced varistors.
In this study, the microstructure and electrical properties of ZnO-Bi₂O₃-based varistors were comprehensively analyzed, focusing on the effects of sintering temperature and In₂O₃ doping. Key findings show that sintering temperatures will affect densification and inter-grain connectivity, changing the microstructures and electrical properties of varistor. The doping of In₂O₃ was found to inhibit grain growth and affect the grain boundary parameters, which influences the varistor's non-linear characteristics. These results contribute to a better understanding of how material processing can be optimized to improve the performance of varistors in surge protection applications.
Supervisors: Asst. Prof. Yoav Kalcheim (Technion), Prof. Daniel Q. Tan (GTIIT)