Electroplating chromium on CVD SiC and SiCf-SiC advanced cladding via PyC compatibility coating

Caen Ang; Craig Kemery; Yutai Katoh

doi:10.1016/j.jnucmat.2018.03.009

Electroplating chromium on CVD SiC and SiC_f-SiC advanced cladding via PyC compatibility coating

Caen Ang, Craig Kemery, Yutai Katoh

Materials Science and Technology Div

Research output: Contribution to journal › Article › peer-review

21 Scopus citations

Abstract

Electroplating Cr on SiC using a pyrolytic carbon (PyC) bond coat is demonstrated as an innovative concept for coating of advanced fuel cladding. The quantification of coating stress, SEM morphology, XRD phase analysis, and debonding test of the coating on CVD SiC and SiC_f-SiC is shown. The residual tensile stress (by ASTM B975) of electroplated Cr is > 1 GPa prior to stress relaxation by microcracking. The stress can remove the PyC/Cr layer from SiC. Surface etching of ∼20 μm and roughening to R_a > 2 μm (by SEM observation) was necessary for successful adhesion. The debonding strength (by ASTM D4541) of the coating on SiC slightly improved from 3.6 ± 1.4 MPa to 5.9 ± 0.8 MPa after surface etching or machining. However, this improvement is limited due to the absence of an interphase, and integrated CVI processing may be required for further advancement.

Original language	English
Pages (from-to)	245-249
Number of pages	5
Journal	Journal of Nuclear Materials
Volume	503
DOIs	https://doi.org/10.1016/j.jnucmat.2018.03.009
State	Published - May 2018

Funding

The authors would like to thank J. Kiggans (ORNL), B. Jolly (ORNL) and J. Daniels (NEO) for assistance throughout the project. R. Lowden, Sr. (ORNL) provided critical review, and R. Lott (UTK) contributed editorial review of the manuscript. The authors thank General Atomics for prototype cladding sections. Research was sponsored by the Advanced Fuels Campaign (AFC) of the Fuel Cycle Research and Development (FCRD) program , Office of Nuclear Energy, US Department of Energy, under contract DE-AC05-00OR22725 with UT-Battelle, LLC .

Keywords

Chromium
Cladding
Electroplating
SiC
Tensile stress

Access to Document

10.1016/j.jnucmat.2018.03.009

Cite this

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title = "Electroplating chromium on CVD SiC and SiCf-SiC advanced cladding via PyC compatibility coating",

abstract = "Electroplating Cr on SiC using a pyrolytic carbon (PyC) bond coat is demonstrated as an innovative concept for coating of advanced fuel cladding. The quantification of coating stress, SEM morphology, XRD phase analysis, and debonding test of the coating on CVD SiC and SiCf-SiC is shown. The residual tensile stress (by ASTM B975) of electroplated Cr is > 1 GPa prior to stress relaxation by microcracking. The stress can remove the PyC/Cr layer from SiC. Surface etching of ∼20 μm and roughening to Ra > 2 μm (by SEM observation) was necessary for successful adhesion. The debonding strength (by ASTM D4541) of the coating on SiC slightly improved from 3.6 ± 1.4 MPa to 5.9 ± 0.8 MPa after surface etching or machining. However, this improvement is limited due to the absence of an interphase, and integrated CVI processing may be required for further advancement.",

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author = "Caen Ang and Craig Kemery and Yutai Katoh",

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AU - Katoh, Yutai

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N2 - Electroplating Cr on SiC using a pyrolytic carbon (PyC) bond coat is demonstrated as an innovative concept for coating of advanced fuel cladding. The quantification of coating stress, SEM morphology, XRD phase analysis, and debonding test of the coating on CVD SiC and SiCf-SiC is shown. The residual tensile stress (by ASTM B975) of electroplated Cr is > 1 GPa prior to stress relaxation by microcracking. The stress can remove the PyC/Cr layer from SiC. Surface etching of ∼20 μm and roughening to Ra > 2 μm (by SEM observation) was necessary for successful adhesion. The debonding strength (by ASTM D4541) of the coating on SiC slightly improved from 3.6 ± 1.4 MPa to 5.9 ± 0.8 MPa after surface etching or machining. However, this improvement is limited due to the absence of an interphase, and integrated CVI processing may be required for further advancement.

AB - Electroplating Cr on SiC using a pyrolytic carbon (PyC) bond coat is demonstrated as an innovative concept for coating of advanced fuel cladding. The quantification of coating stress, SEM morphology, XRD phase analysis, and debonding test of the coating on CVD SiC and SiCf-SiC is shown. The residual tensile stress (by ASTM B975) of electroplated Cr is > 1 GPa prior to stress relaxation by microcracking. The stress can remove the PyC/Cr layer from SiC. Surface etching of ∼20 μm and roughening to Ra > 2 μm (by SEM observation) was necessary for successful adhesion. The debonding strength (by ASTM D4541) of the coating on SiC slightly improved from 3.6 ± 1.4 MPa to 5.9 ± 0.8 MPa after surface etching or machining. However, this improvement is limited due to the absence of an interphase, and integrated CVI processing may be required for further advancement.

KW - Chromium

KW - Cladding

KW - Electroplating

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KW - Tensile stress

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