Validation of miniature test specimens for post-irradiation thermal diffusivity measurement

Masafumi Akiyoshi, Ryuta Kasada, Yuko Ishibashi, Lauren M. Garrison, Josina W. Geringer, Wallace D. Porter, Yutai Katoh

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Radioactivity levels for conventional thermal diffusivity test specimens are often prohibitively high for examination with candidate metallic materials, such as tungsten and reduced activation steels for fusion energy. Therefore, in the ongoing Japan–US PHENIX project, irradiation in the high flux isotope reactor (HFIR) was performed with the miniature specimen form of diameter (D) 3 mm × thickness (T) 1/2 mm small disk for thermal diffusivity measurement. In this study, the thermal diffusivity measurement of this miniature specimen is validated using a Netzsch LFA-467 ‘Hyper Flash’ thermal analyzer and ‘graphene nanoplatelets containing agent’. With careful surface treatment and data analysis, the miniature specimens showed almost the same value as the diameter 10 mm standard specimens.

Original languageEnglish
Pages (from-to)513-517
Number of pages5
JournalFusion Engineering and Design
Publication statusPublished - 2018 Nov


  • Ceramics
  • Miniature specimen
  • Neutron irradiation
  • Thermal diffusivity
  • Tungsten


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