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This article deals with the problem of material erosion of the facing components in fusion reactors and the attempts to solve this by selecting suitable materials and component designs. Research programmes are concentrating on the development, characterization and optimization of graphites, pyrocarbons and carbon-based fibre composites, as well as thin protective properties of carbons, because of the good thermomechanical properties of carbons. In the TEXTOR experiment it was possible to create plasmas of extreme purity by these means. In the case of measures against chemical erosion, structures where graphite is soldered onto a metallic substrate with good thermal conductivity such as molybdenum, or the addition of boron, boron carbide, silicon or silicon carbide are of particular significance. In addition, the treatment with carbon or boron of the complete facing component system is important because it prolongs the life of the layers. The essential behaviour of materials and components can be examined in an integral TEXTOR test. However, the successful use of carbon requires that the power deposition is limited during normal operation and that the erosion processes are restricted to physical atomization. Homogeneous fine-grained mixtures of conducting ceramics and advanced graphites are of particular interest for future reactor developments.

Additional information

Authors: WINTER J, Kernforschungsanlage Jülich GmbH (DE)
Bibliographic Reference: Article: AGF Forschungsthemen 1 (1988): Fusion No. 1 pp. 25-26
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