Abstract
Bi-2212 superconductor has become an important research object in high temperature superconducting (HTS) magnets due to its excellent performance at low temperatures. The "wind-and-react" (W&R) process of Bi-2212 HTS magnet puts a high demand on the insulating structure. The alumino-silicate fiber was selected as an insulating fiber material, and air heat treatment was carried out to remove carbon. The influence of heat treatment on the physical-chemical properties of alumino-silicate fiber was characterized by means of TG-DSC, SEM, XPS, as well as tensile test. The results showed that the best treatment condition for carbon removal on the fiber surface is 600 °C for 2 h. Based on the optimization of insulating fiber and the exploration of pretreatment methods, the fiber-resin composite material was fabricated by the vacuum pressure impregnation (VPI) process. The insulation performance, mechanical strength including tensile strength, and interlaminar shear strength of the composites were tested, and the failure mechanism was analyzed by observing the microstructure of the failure site. Results obtained showed that after heat treatment at 890 °C, the composite formed by the alumino-silicate fiber still has high strength. It provides a reference for the manufacture of Bi-2212 CICC insulating structures.
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