Presentation Information
[APP1-09]Effect of Different Nanofillers on the Electrical Breakdown Properties of Polyimide Films at Cryogenic Temperature
*Shen Zhao1 (1. Technical Institute of Physics and Chemistry (China))
Keywords:
Polyimide,Dielectric Breakdown,Nanofillers
Polyimide (PI) is widely used as insulation material in superconducting systems due to its excellent mechanical strength and electrical insulation performance at cryogenic temperatures. However, limited by space charge accumulation and local electric field distortion, the electrical breakdown strength under high voltage of pure PI needs to be improved. In this work, we investigate the effects of various nanofillers including SiO2, Al2O3, and hexagonal boron nitride nanosheets (BNNS) on the dielectric breakdown performances of PI films at cryogenic temperatures. PI nanocomposite films with different filler types, loadings and film thickness were prepared, and AC/DC electro breakdown tests were conducted at 77K. The results reveal the trap inducing role of nanofillers and the enhancement mechanism of electrical breakdown strength of PI composite films at cryogenic temperatures. This work provides guidance for promoting the insulation application of polyimide under low-temperature and high field conditions.