R. Prokopec, K. Humer, R. Maix, H. Fillunger, H. W. Weber:
"Characterization of advanced cyanate ester/epoxy insulation systems before and";
Fusion Engineering and Design,
Insulation systems for fusion magnets have to operate in a harsh environment, especially also under
intense radiation. Over the past years, cyanate ester (CE) resins have been playing an increasingly important
role because of their enhanced temperature and radiation resistance compared to conventional epoxy
resins. Blending CE with epoxy resins offers the possibility to manufacture radiation resistant insulations
at a low price compared to pure CE materials. Therefore, it is of special interest to study the influence of
the CE content and of the epoxy resin on the mechanical properties to find materials, which are suitable
and economically reasonable for the specific demands of such magnets.
In this study R-glass fiber/Kapton reinforced cyanate ester/epoxy blends with different CE content
were investigated. Each material was exposed to conditions matching those expected for the ITER TF coil
insulation as closely as possible. In order to characterize the mechanical properties, short-beam shear
and static tensile tests were carried out at 77K prior to and after irradiation to fast neutron fluences of up
to 5◊1022m−2 (E > 0.1 MeV), in the TRIGA reactor (Vienna) at ambient temperature (340 K). In addition,
tension-tension fatigue measurements were performed in the load-controlled mode to simulate the
pulsed operation conditions of ITER.
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