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

Llion Marc Evans, Lee Margetts, Valentina Casalegno, Fabien Leonard, Tristan Lowe, Peter D Lee, M Schmidt, Paul M Mummery

    Research output: Contribution to journalArticlepeer-review

    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.
    Original languageEnglish
    Pages (from-to)826-836
    Number of pages10
    JournalFusion Engineering and Design
    Volume89
    Issue number6
    DOIs
    Publication statusPublished - 5 Jun 2014

    Keywords

    • Fusion
    • Plasma facing wall
    • X-ray tomography
    • Thermal conductivity
    • Carbon fibre composites
    • Copper
    • Joining
    • Composite

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