A Radiation-Resistant Epoxy Resin System for Toroidal Field and Other Superconducting Coil Fabrication
A liquid-epoxy resin system with high resistance to 4-K reactor radiation (neutron plus gamma) has been developed that meets all ITER and BPX requirements: pot life longer than 12 h at ambient temperatures; viscosity less than 1000 cP over its entire pot life; cure below 150°C; low shrinkage; no volatiles upon curing; excellent penetration; and good wetting of fibers, stainless steels, and nickel-based steels.
The strength of the epoxy resin system, CTD-101, was tested with and without S-2 Glass®* fiber reinforcement at 295, 76 and 4 K. Specimens were then irradiated at two dose levels (2.9 × 107 and 1.6 × 108 Gy) at temperatures below 6 K.
Virtually no deterioration in interlaminar shear strength at 76 K was observed after the lower dose level, which is the end-of-life dose level for ITER. After the higher dose level, the material had degraded, but its strength was still well above the BPX requirement (14 MPa in shear) at the end-of-life dose level of 1 × 108 Gy.
KeywordsDose Level High Dose Level Resin System Epoxy Resin System Total Radiation Dose
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