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Promising Composite Heat Sink Material for the Divertor of Future Fusion Reactors by A. Brendel; C. Popescu; T. Köck; H. Bolt is a Materials Science article available to read on EtoBox.

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We investigate SiC fibre reinforced copper as an additional layer at the highly loaded zone between plasma facing material (W) and heat sink (CuCrZr) for a fusion reactor divertor. Copper has a high thermal conductivity of 380 Wm À1 K À1 but a very low strength and creep resistance at 550 °C. Therefore copper is reinforced with SiC long fibres (SCS6, Specialty Materials) having excellent high temperature strength. The fibres were galvanically coated with an 80 lm-thick copper layer as matrix. Hot isostatic pressing at 650 °C was applied to form the composite material. The interfacial shear strength calculated from push-out tests was $6 MPa. Adding a 100 nm-thin titanium interlayer deposited by magnetron sputtering led to a higher adhesion of the SiC fibres in the copper matrix. Titanium reacted with the carbon surface of the fibre to TiC and formed with copper the alloy Cu 4 Ti during heat treatment and increased the interfacial shear strength to 70 MPa.

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Author

A. Brendel; C. Popescu; T. Köck; H. Bolt

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0022-3115)

Published

2007

Language

EN

Field

Materials Science (Physical Sciences)