On Techniques to Characterize and Correlate Grain Size, Grain Boundary Orientation and the Strength of the SiC Layer of TRISO Coated Particles: A Preliminary Study

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The mechanical properties of the silicon carbide (SiC) layer of the TRi-ISOtropic (TRISO) coated particle (CP) for high temperature gas reactors (HTGR) are performance parameters that have not yet been standardized by the international HTR community. Presented in this paper are the results of characterizing coated particles to reveal the effect of annealing temperature (1000 to 2100°C) on the strength and grain size of unirradiated coated particles. This work was further expanded to include possible relationships between the grain size and strength values. The comparative results of two strength measurement techniques and grain size measured by the Lineal intercept method ... continued below

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Rooyen, I.J.van; Gougar, J.L. Dunzik; Trowbridge, T. & Rooyen, Philip M van October 1, 2012.

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The mechanical properties of the silicon carbide (SiC) layer of the TRi-ISOtropic (TRISO) coated particle (CP) for high temperature gas reactors (HTGR) are performance parameters that have not yet been standardized by the international HTR community. Presented in this paper are the results of characterizing coated particles to reveal the effect of annealing temperature (1000 to 2100°C) on the strength and grain size of unirradiated coated particles. This work was further expanded to include possible relationships between the grain size and strength values. The comparative results of two strength measurement techniques and grain size measured by the Lineal intercept method are included. Preliminary grain boundary characterization results determined by electron backscatter diffraction (EBSD) are included. These results are also important for future fission product transport studies, as grain boundary diffusion is identified as a possible mechanism by which 110mAg, one of the fission activation products, might be released through intact SiC layers. Temperature is a parameter known to influence the grain size of SiC and therefore it is important to investigate the effect of high temperature annealing on the SiC grain size. Recommendations and future work will also be briefly discussed.

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  • 6th International Topical Meeting on High Temperature Reactor Technology HTR2012,Miraikan, Tokyo Japan,10/28/2012,11/01/2012

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  • Report No.: INL/CON-12-26395
  • Grant Number: DE-AC07-05ID14517
  • Office of Scientific & Technical Information Report Number: 1055979
  • Archival Resource Key: ark:/67531/metadc842691

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  • October 1, 2012

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  • May 19, 2016, 9:45 a.m.

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  • June 20, 2016, 2:09 p.m.

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Rooyen, I.J.van; Gougar, J.L. Dunzik; Trowbridge, T. & Rooyen, Philip M van. On Techniques to Characterize and Correlate Grain Size, Grain Boundary Orientation and the Strength of the SiC Layer of TRISO Coated Particles: A Preliminary Study, article, October 1, 2012; Idaho Falls, Idaho. (digital.library.unt.edu/ark:/67531/metadc842691/: accessed December 12, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.