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Elsevier, Fusion Engineering and Design, 6(89), p. 826-836, 2014

DOI: 10.1016/j.fusengdes.2014.05.002

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Thermal characterisation of ceramic/metal joining techniques for fusion applications using X-ray tomography

Journal article published in 2014 by L.-Llion M. Evans ORCID, Lee Margetts, Valentina Casalegno, Fabien Leonard ORCID, Tristan Lowe, Pd D. Lee ORCID, Marc Schmidt, Lm-L. M. Margetts L. Casalegno V. Leonard F. Lowe T. Lee P. D. Schmidt M. Mummery P. M. Evans, Pm M. Mummery, L. Margetts V Casalegno F Leonard T Lowe P D. Lee M Schmidt P M. Mummery L.-L. M. Evans
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

This work investigates the thermal performance of four novel CFC Cu joining techniques. Two involve direct casting and brazing of Cu onto a chromium modified CFC surface, the other two pre coat a brazing alloy with chromium using galvanisation and sputtering processes. The chromium carbide layer at the interface has been shown to improve adhesion. Thermal conductivity across the join interface was measured by laser flash analysis. X ray tomography was performed to investigate micro structures that might influence the thermal behaviour. It was found that thermal conductivity varied by up to 72 %. Quantification of the X ray tomography data showed that the dominant feature in reducing thermal conductivity was the lateral spread of voids at the interface. Correlations were made to estimate the extent of this effect.