Influence of SiC microstructure on its corrosion behavior in molten FLiNaK salt

L. J. Espinoza-Pérez; S. Esquivel-Medina; E. López-Honorato

doi:10.1016/j.ceramint.2021.02.120

Influence of SiC microstructure on its corrosion behavior in molten FLiNaK salt

L. J. Espinoza-Pérez, S. Esquivel-Medina, E. López-Honorato

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Abstract

The influence of the microstructure on the corrosion rate of three monolithic SiC samples in FLiNaK salt at 900 °C for 250 h was studied. The SiC samples, labeled as SiC-1, SiC-2, and SiC-3, had corrosion rates of 0.137, 0.020, and 0.043 mg/cm²h, respectively. Compared with grain size and the presence of special grain boundaries (i.e., Σ3), the content of high-angle grain boundaries (HAGBs) appeared to have the strongest influence on the corrosion rate of SiC in FLiNaK salt, since the corrosion rate increased six times as the concentration of high-angle grain boundaries increased from 19 to 32% for SiC-2 and SiC-1, respectively. These results stress the importance of controlling the content of HAGBs during the production process of SiC.

Original language	English
Pages (from-to)	15527-15532
Number of pages	6
Journal	Ceramics International
Volume	47
Issue number	11
DOIs	https://doi.org/10.1016/j.ceramint.2021.02.120
State	Published - Jun 1 2021

Funding

This manuscript has been authored by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE) . The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan ). This material is based upon work supported by a grant from the Consejo Nacional de Ciencia y Tecnología (CONACYT, project number: 245629 , CONACYT-Horizon 2020), and it forms part of the European project SAMOFAR (A Paradigm Shift in Reactor Safety with the Molten Salt Fast Reactor). The authors would like to acknowledge CONACYT for MSc. and PhD grants awarded to Saraí Esquivel-Medina and Léster J. Espinoza-Pérez, respectively. This manuscript has been authored by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan).Fig. 8 shows the relationship between the corrosion rate of three SiC samples and the HAGB and LAGB content. Fig. 8 shows the observed corrosion rates (0.020, 0.043, and 0.137 mg/cm2h) appear to be higher as a function of higher HAGB content (18.7, 24.6, and 32.4%) for SiC-2, SiC-3 and SiC-1, respectively (i.e., SiC-2<SiC-3<SiC-1). In contrast, no correlation was found between the general content of CSL grain boundaries or Σ3 grain boundaries and the corrosion rate (see Fig. S4 in supporting information), since the CSLB content remained almost the same for all samples, and the content of Σ3 was progressively higher in the sequence SiC-1<SiC-2<SiC-3. The corrosion rate appeared to be higher as a function of lower LAGB content (Fig. 8b). However, the 3.2 × higher corrosion rate for sample SiC-1 compared with sample SiC-3 was probably more influenced by the 28% higher HAGB content than the 7% lower LAGB content.This material is based upon work supported by a grant from the Consejo Nacional de Ciencia y Tecnología (CONACYT, project number: 245629, CONACYT-Horizon 2020), and it forms part of the European project SAMOFAR (A Paradigm Shift in Reactor Safety with the Molten Salt Fast Reactor). The authors would like to acknowledge CONACYT for MSc. and PhD grants awarded to Saraí Esquivel-Medina and Léster J. Espinoza-Pérez, respectively.

Funders	Funder number
CONACYT-Horizon 2020
DOE Public Access Plan	SiC-3, 18.7, 0.043, 24.6
SAMOFAR
U.S. Department of Energy
Consejo Nacional de Ciencia y Tecnología	245629

Keywords

Corrosion rate
FLiNaK
Grain boundary character distribution
Grain-size distribution
Microstructure
Silicon carbide

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title = "Influence of SiC microstructure on its corrosion behavior in molten FLiNaK salt",

abstract = "The influence of the microstructure on the corrosion rate of three monolithic SiC samples in FLiNaK salt at 900 °C for 250 h was studied. The SiC samples, labeled as SiC-1, SiC-2, and SiC-3, had corrosion rates of 0.137, 0.020, and 0.043 mg/cm2h, respectively. Compared with grain size and the presence of special grain boundaries (i.e., Σ3), the content of high-angle grain boundaries (HAGBs) appeared to have the strongest influence on the corrosion rate of SiC in FLiNaK salt, since the corrosion rate increased six times as the concentration of high-angle grain boundaries increased from 19 to 32% for SiC-2 and SiC-1, respectively. These results stress the importance of controlling the content of HAGBs during the production process of SiC.",

keywords = "Corrosion rate, FLiNaK, Grain boundary character distribution, Grain-size distribution, Microstructure, Silicon carbide",

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AU - Espinoza-Pérez, L. J.

AU - Esquivel-Medina, S.

AU - López-Honorato, E.

PY - 2021/6/1

Y1 - 2021/6/1

N2 - The influence of the microstructure on the corrosion rate of three monolithic SiC samples in FLiNaK salt at 900 °C for 250 h was studied. The SiC samples, labeled as SiC-1, SiC-2, and SiC-3, had corrosion rates of 0.137, 0.020, and 0.043 mg/cm2h, respectively. Compared with grain size and the presence of special grain boundaries (i.e., Σ3), the content of high-angle grain boundaries (HAGBs) appeared to have the strongest influence on the corrosion rate of SiC in FLiNaK salt, since the corrosion rate increased six times as the concentration of high-angle grain boundaries increased from 19 to 32% for SiC-2 and SiC-1, respectively. These results stress the importance of controlling the content of HAGBs during the production process of SiC.

AB - The influence of the microstructure on the corrosion rate of three monolithic SiC samples in FLiNaK salt at 900 °C for 250 h was studied. The SiC samples, labeled as SiC-1, SiC-2, and SiC-3, had corrosion rates of 0.137, 0.020, and 0.043 mg/cm2h, respectively. Compared with grain size and the presence of special grain boundaries (i.e., Σ3), the content of high-angle grain boundaries (HAGBs) appeared to have the strongest influence on the corrosion rate of SiC in FLiNaK salt, since the corrosion rate increased six times as the concentration of high-angle grain boundaries increased from 19 to 32% for SiC-2 and SiC-1, respectively. These results stress the importance of controlling the content of HAGBs during the production process of SiC.

KW - Corrosion rate

KW - FLiNaK

KW - Grain boundary character distribution

KW - Grain-size distribution

KW - Microstructure

KW - Silicon carbide

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Influence of SiC microstructure on its corrosion behavior in molten FLiNaK salt

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