低温工学
Online ISSN : 1880-0408
Print ISSN : 0389-2441
ISSN-L : 0389-2441
超電導磁石用絶縁材料の低温原子炉照射効果 (III)
液体ヘリウム試験
加藤 輝雄高村 三郎
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1980 年 15 巻 3 号 p. 173-178

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Organic insulators, such as polyimide, epoxy resins and fiber reinforced epoxies (FRP), are irradiated in the fission reactor at about 5K and their mechanical properties are measured in liquid helium without warm-up. At the very low temperature, the materials are completely brittle and the serration in the stress-strain curves takes place on polyimide, epoxy resins and CFRP.
After irradiation of the absorbed dose of 1.1×109 rad at about 5K, the breaking stress of epoxy resins reduces by 30-40% and FRP and polyimide exhibit a little decrease in the mechanical strength. FRP and polyimide have good radiation resistance on the mechanical behavior after dose of -1×109 rad as compared with other selected organic materials.

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