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The use of unprotected molybdenum for wall components in fusion devices gives rise to problems of impurity generation caused by sputtering, so that brazed graphite coatings are suggested for NET and ITER. In case of failure, repairs may be made using a thin film deposition technique. The behaviour of this thin carbon layer on molybdenum is studied under plasma exposure. Complete erosion of the carbon film was observed at areas of largest heat flux (1100 C). The progressive release of molybdenum led to contamination of the carbon limiters in the SOL. When these are exposed at a later stage, the molybdenum spreads on to all wall areas. The formation of Mo(2)C on the limiter surface is an important aspect.

Additional information

Authors: WINTER J ET AL., Kernforschungsanlage Jülich GmbH, Jülich (DE);KNY E, Österreichisches Forschungszentrum Seibersdorf, Seibersdorf (AT);GRASSERBAUER W, Technische Universität Wien, Institut für Analytische Chemie, Wien (AT)
Bibliographic Reference: Article: 18th European Conference on Controlled Fusion and Plasma Physics, Vol. III (1991) pp. 172-176
Record Number: 199111422 / Last updated on: 1994-12-02
Original language: en
Available languages: en