Karlsruher Institut für Technologie



TUNGSTEN – Properties, possible and impossible applications

Donnerstag, 08. Dezember 2011, 14:00-16:00
KIT Campus Nord, INR, Bau 521, 2. OG, Raum 302
Abstract: Tungsten is an extreme material. Of all metals it has, for example, the highest melting point, the lowest thermal expansion coefficient and the lowest vapour pressure. But tungsten has significant drawbacks which prevent its use for typical structural applications. With the advance of nuclear fu-sion technology the need for exceptional high heat flux components arose. And therefore, many generic designs of cooling components have been proposed which make extensive use of tungsten as armor, but also as structural material. This presentation gives an overview of the basic properties of tungsten, its typical use, consumption and resources. Commercial production routes and processing techniques are discussed with the focus on material properties and application. It will be shown that tungsten cannot be easily used for cooling structures or other structural applications. Especially in a nuclear fusion environment, many different aspects become relevant at the same time. Taking these into account together with the special material properties leads to a set of design rules which have to be applied to tungsten, if it had to be used as a structural material. To illustrate some of the worst problems, three different helium cooled divertor designs are analyzed and assessed. Finally, an outlook on recent developments of tungsten composites and their advantage over standard bulk tungsten is given.
Dr. Michael Rieth

Karlsruher Institut für Technologie, Campus Nord
Institut für Neutronenphysik und Reaktortechnik
Karlsruher Institut für Technologie (KIT) - Campus Nord
Hermann-von-Helmholtz-Platz 1
76344 Eggenstein-Leopoldshafen
E-Mail:ingeborg schwartzXuh9∂kit edu