Radiation Resistant Epoxy for Resin Transfer Molding Fabrication of Cryogenic Electrical Insulation

Construction scenarios for large superconducting magnets coils for fusion reactor applications often include liquid impregnation of the organic matrix of the composite electrical insulation. The epoxy matrix must exhibit low viscosity and long working life for reliable fabrication of these large structures. Radiation induced gas evolution and degradation of mechanical and electrical properties are also a concern for these materials. Radiation resistant organic matrix materials have typically not been amenable to liquid impregnation fabrication scenarios. A new multi-functional aromatic amine cured epoxy formulation has been developed which is suitable for the resin transfer molding fabrication of large magnet coil structures. Structural features of this resin are known to be radiation resistant. Rheological and kinetic properties, and cryogenic composite mechanical properties of the proprietary resin system are presented.