Performance of brazed graphite, carbon-fiber composite, and TZM materials for actively cooled structures. Qulification tests

Ivica Smid, Charles D. Croessmann, Robert D. Watson, Jochen Linke, Antonino Cardella, Harald Bolt, Nikolaus Reheis, Erich Kny

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

The divertor of a near-term fusion device has to withstand high heat fluxes, heat shocks, and erosion caused by the plasma. Furthermore, it has to be maintainable through remote techniques. Above all, a good heat removal capability across the interface (low-Z armor/heat sink) plus overall integrity after many operational cycles are needed. To meet all these requirements, an active metal brazing technique is applied to bond graphite and carbon-fiber composite materials to a heat sink consisting of a Mo-41Re coolant tube through a TZM body. Plain brazed graphite and TZM tiles are tested for their fusion-relevant properties. The interfaces appear undamaged after thermal cycling when the melting point of the braze joint is not exceeded and when the graphite armor is >4 mm thick. High heat flu tests are performed on three actively cooled divertor targets. The braze joints show no sign of failure after exposure to thermal loads approximately 25% higher than the design value surface heat flux of 10 MW/m2.

Original languageEnglish (US)
Pages (from-to)2035-2040
Number of pages6
JournalFusion Technology
Volume19
Issue number4
DOIs
StatePublished - Jan 1 1991

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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