Microstructural Characterization of Next-Generation ETU-10 Nuclear Graphite via Transmission Electron Microscopy
Faculty Mentor Information
Dr. Karthik Chinnathambi, Boise State University; and Dr. Rick Ubic, Boise State University
Presentation Date
7-15-2026
Abstract
Nuclear graphite serves as a critical moderator and structural material in advanced nuclear reactors. Under high-temperature neutron irradiation, the thermal and structural capabilities of nuclear graphite degrade over time, directly impacting the operational lifespan of reactors. Consequently, characterizing the baseline, unirradiated microstructure of newly introduced superfine graphite grades such as Ibiden’s ETU-10 is essential for predicting material performance and qualifying components for Generation IV reactor designs. In this study, transmission electron microscopy (TEM) was employed to study the different microstructural components of ETU-10 graphite, including the filler particles, binder phase, and porosity. High-quality, electron-transparent samples were fabricated via conventional TEM preparation techniques, including sectioning, grinding/polishing and ion milling. The resulting TEM micrographs establish a baseline reference for evaluating future radiation-induced damage and dimensional swelling in advanced reactor environments.
Microstructural Characterization of Next-Generation ETU-10 Nuclear Graphite via Transmission Electron Microscopy
Nuclear graphite serves as a critical moderator and structural material in advanced nuclear reactors. Under high-temperature neutron irradiation, the thermal and structural capabilities of nuclear graphite degrade over time, directly impacting the operational lifespan of reactors. Consequently, characterizing the baseline, unirradiated microstructure of newly introduced superfine graphite grades such as Ibiden’s ETU-10 is essential for predicting material performance and qualifying components for Generation IV reactor designs. In this study, transmission electron microscopy (TEM) was employed to study the different microstructural components of ETU-10 graphite, including the filler particles, binder phase, and porosity. High-quality, electron-transparent samples were fabricated via conventional TEM preparation techniques, including sectioning, grinding/polishing and ion milling. The resulting TEM micrographs establish a baseline reference for evaluating future radiation-induced damage and dimensional swelling in advanced reactor environments.