Dielectric properties of TiO2/Epoxy nanocomposites in liquid nitrogen environment

4th International Conference on Applied Materials and Manufacturing Technology

材料科学;机械制造

Jiabei, Zhang^1 ; Ming, Qiu^1 ; Hongjie, Zhang^1 ; Yongqing, Zhao^1

China Electric Power Research Institute, 15 Xiaoying East Road, Beijing, China^1

关键词: Breakdown strengths;    Epoxy resin nanocomposites;    Insulation design;    Insulation property;    Low temperatures;    Nitrogen environment;    TiO2 nano-particles;    Titanium dioxide particles;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/423/1/012072/pdf
DOI  :  10.1088/1757-899X/423/1/012072

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The application of superconductivity technology can solve many problems in power industry. Compared with the conventional technology, superconductivity technology has many superior properties. However, the epoxy resin material used for superconducting equipment insulation is often in liquid nitrogen environment, and the low temperature will bring many changes to the insulation properties of the epoxy resin, which brings new problems to the insulation design of the superconducting equipment. In this paper, a novel epoxy resin nanocomposite was developed. We used titanium dioxide particles with average size of 10nm and 35nm mixed with epoxy resin to obtain different doping amount of samples, and the samples were tested at room temperature and liquid nitrogen environment separately. Through experiments, it was found that the addition of TiO2 nanoparticles enhanced the breakdown strength of the epoxy resin compared to the pure epoxy samples. The breakdown strength under liquid nitrogen conditions was higher than the breakdown strength at normal temperature. The dielectric properties test showed that the dielectric constant of epoxy resin in liquid nitrogen was lower than that in room temperature, and the addition of TiO2 nanoparticles increased the dielectric constant of the epoxy resin. Dielectric loss was greatly influenced by temperature and was significantly higher than normal temperature under liquid nitrogen conditions.