Performance of boron/carbon first wall materials under fusion relevant conditions
The conditioning of the plasma facing wall in thermonuclear confinement experiments has been performed very successfully by the application of amorphous boron-containing hydrogenated carbon films. Boronisation leads to tokamak discharges with significantly reduced oxygen and carbon contaminations. For high heat flux components (especially in future quasi-stationary confinement experiments) new boron/carbon materials will have to be developed: monolithic tiles of boronated graphites which can be brazed to watercooled substrates or thick B(4)C-coatings on graphite or high-Z coolant tubes. A variety of bulk materials (boronated graphites with boron contents ranging from 3 - 30%, so-called coat mix material on the basis of B(4)C) and coatings (amorphous B/C films, thick B(4)C layers applied by LPPS or CVD methods) have been characterised systematically. In addition, the behaviour of these materials has been investigated under thermal loads. Erosion and disruption simulation experiments were performed in electron and ion beam high heat flux test facilities. Physical and chemical sputtering of the coat mix material was studied in the PISCES-B facility.
Bibliographic Reference: Article: Journal of Nuclear Materials, Vol. 176 & 177 (1990) pp. 856-863
Record Number: 199210222 / Last updated on: 1994-12-02
Original language: en
Available languages: en