Effect of neutron radiation on the dielectric, mechanical and thermal properties of ceramics for RF transmission windows

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The behavior of electrically insulating ceramics was investigated before and after exposure to neutron radiation. Mechanical, thermal and dielectric specimens were studied after exposure to a fast neutron dose of 0.1 displacements per atom (dpa) at Oak Ridge National Laboratory (ORNL). Four materials were compared to alumina: polycrystalline spinel, aluminum nitride, sialon and silicon nitride. Mechanical bend tests were performed before and after irradiation. Thermal diffusivity was measured using a room temperature laser flash technique. Dielectric loss factor was measured at 105 MHz with a special high resolution resonance cavity. The materials exhibited a significant degradation of thermal diffusivity and ... continued below

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[30] p.

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Hazelton, C.; Rice, J.; Snead, L.L. & Zinkle, S.J. December 31, 1998.

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Description

The behavior of electrically insulating ceramics was investigated before and after exposure to neutron radiation. Mechanical, thermal and dielectric specimens were studied after exposure to a fast neutron dose of 0.1 displacements per atom (dpa) at Oak Ridge National Laboratory (ORNL). Four materials were compared to alumina: polycrystalline spinel, aluminum nitride, sialon and silicon nitride. Mechanical bend tests were performed before and after irradiation. Thermal diffusivity was measured using a room temperature laser flash technique. Dielectric loss factor was measured at 105 MHz with a special high resolution resonance cavity. The materials exhibited a significant degradation of thermal diffusivity and an increase in dielectric loss tangent. The flexural strength and physical dimensions were not significantly affected by the 0.1 dpa level of neutron radiation. The aluminum nitride and S silicon nitride showed superior RF window performance over the sialon and the alumina. The results are compared to radiation studies on similar materials.

Physical Description

[30] p.

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INIS; OSTI as DE99001340

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  • Innovative materials in advanced energy technologies, Florence (Italy), 14-19 Jun 1998

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  • Other: DE99001340
  • Report No.: ORNL/CP--98583
  • Report No.: CONF-980604--
  • Grant Number: AC05-96OR22464;FG03-93ER81586
  • DOI: 10.2172/304183 | External Link
  • Office of Scientific & Technical Information Report Number: 304183
  • Archival Resource Key: ark:/67531/metadc682447

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • December 31, 1998

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  • July 25, 2015, 2:20 a.m.

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  • Nov. 3, 2016, 6:59 p.m.

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Hazelton, C.; Rice, J.; Snead, L.L. & Zinkle, S.J. Effect of neutron radiation on the dielectric, mechanical and thermal properties of ceramics for RF transmission windows, report, December 31, 1998; Tennessee. (digital.library.unt.edu/ark:/67531/metadc682447/: accessed October 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.