Microstructural Characterization of Next Generation Nuclear Graphites

Chinnathambi Karthik, Joshua Kane, Darryl P. Butt, William E. Windes, Rick Ubic

Research output: Contribution to journalArticlepeer-review

76 Scopus citations

Abstract

Abstract This article reports the microstructural characteristics of various petroleum and pitch based nuclear graphites (IG-110, NBG-18, and PCEA) that are of interest to the next generation nuclear plant program. Bright-field transmission electron microscopy imaging was used to identify and understand the different features constituting the microstructure of nuclear graphite such as the filler particles, microcracks, binder phase, rosette-shaped quinoline insoluble (QI) particles, chaotic structures, and turbostratic graphite phase. The dimensions of microcracks were found to vary from a few nanometers to tens of microns. Furthermore, the microcracks were found to be filled with amorphous carbon of unknown origin. The pitch coke based graphite (NBG-18) was found to contain higher concentration of binder phase constituting QI particles as well as chaotic structures. The turbostratic graphite, present in all of the grades, was identified through their elliptical diffraction patterns. The difference in the microstructure has been analyzed in view of their processing conditions.

Original languageAmerican English
Pages (from-to)272-278
Number of pages7
JournalMicroscopy and Microanalysis
Volume18
Issue number2
DOIs
StatePublished - Apr 2012

Keywords

  • nuclear graphite
  • graphitization
  • transmission electron microscopy

EGS Disciplines

  • Materials Science and Engineering

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