Neutron and. gamma. -ray irradiation effects in composite organic insulators

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Neutron irradiations with low ..gamma..-ray flux in the Intense Pulsed Neutron Source were carried out on four kinds of cloth-filled organic composites (filler: E-glass or carbon fiber; matrix: epoxy or polyimide resin) and a unidirectional alumina fiber/epoxy composite. The mechanical test was performed at room temperature. Following irradiation at room temperature, the glass/epoxy and glass/polyimide composites degrade significantly at a total neutron fluence of 5.0 x 10/sup 18/ n/cm/sup 2/ (1.4 x 10/sup 18/ n/cm/sup 2/ for E > 0.1 MeV), while the other composites do not degrade at this fluence. Comparison of this result with that of /sup 60/Co ... continued below

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Pages: 19

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Egusa, S.; Kirk, M.A.; Birtcher, R.C. & Hagiwara, M. December 1, 1984.

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Neutron irradiations with low ..gamma..-ray flux in the Intense Pulsed Neutron Source were carried out on four kinds of cloth-filled organic composites (filler: E-glass or carbon fiber; matrix: epoxy or polyimide resin) and a unidirectional alumina fiber/epoxy composite. The mechanical test was performed at room temperature. Following irradiation at room temperature, the glass/epoxy and glass/polyimide composites degrade significantly at a total neutron fluence of 5.0 x 10/sup 18/ n/cm/sup 2/ (1.4 x 10/sup 18/ n/cm/sup 2/ for E > 0.1 MeV), while the other composites do not degrade at this fluence. Comparison of this result with that of /sup 60/Co ..gamma..-ray irradiations reveals that the /sup 10/B(n,..cap alpha..)/sup 7/Li reaction in E-glass fibers accelerates the degradation of composite materials by increasing the extent of radiation damage at the fiber/matrix interface. Following irradiation at 5 K, the present composites do not degrade up to a total neutron fluence of 1.0 x 10/sup 18/ n/cm/sup 2/ (7.0 x 10/sup 17/ n/cm/sup 2/ for E > 0.1 MeV). The mechanical test performed at 77 K on electron-irradiated composites, on the other hand, shows that the rate of degradation with dose is appreciably greater in the 77 K test than in the room-temperature test.

Physical Description

Pages: 19

Notes

NTIS, PC A02/MF A01.

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  • 1. international conference on fusion reactor materials, Tokyo, Japan, 3 Dec 1984

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  • Other: DE85006214
  • Report No.: CONF-841246-15
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 6367613
  • Archival Resource Key: ark:/67531/metadc1212107

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  • December 1, 1984

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  • July 5, 2018, 11:11 p.m.

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  • Oct. 11, 2018, 3:03 p.m.

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Egusa, S.; Kirk, M.A.; Birtcher, R.C. & Hagiwara, M. Neutron and. gamma. -ray irradiation effects in composite organic insulators, article, December 1, 1984; United States. (digital.library.unt.edu/ark:/67531/metadc1212107/: accessed December 11, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.