Beryllium is proposed as an alternative low-Z armor material because the plasma spray process can be used to make in-situ repairs of eroded or damaged surfaces.
Recent advances in plasma spray technology have produced beryllium coatings of 98% density with a 95% deposition efficiency and strong adhesion to the substrate.
With existing technology, the entire active region of the ITER divertor surface could be coated with 2 mm of beryllium in less than 15 h using four small plasma spray guns.
Beryllium also has other potential advantages over graphite, e.g., efficient gettering of oxygen, ten times less tritium inventory, reduced problems of transient fueling from D/T exchange and release, no runaway erosion cascades from self-sputtering, better adhesion of redeposited material, as well as higher strength, ductility, and fracture toughness than graphite.
A 2-D finite element stress analysis was performed on a 3 mm thick.
Be tile brazed to an OFHC soft-copper saddle block, which was brazed to a high-strength copper tube.
Peak stresses remained 50% below the ultimate strength for both brazing and in-service thermal stresses.
Mots-clés Pascal : Réacteur fusion nucléaire, Fusion confinement magnétique, Tokamak, Limiteur, Béryllium, Revêtement, Dépôt, Canon plasma, Disruption électrique, Endommagement, Erosion, Résistance mécanique, Propriété mécanique, Analyse contrainte, Contrainte thermomécanique, Simulation numérique, Code calcul, Méthode élément fini, Dispositif ITER, Code ABAQUS, Code PATRAN
Mots-clés Pascal anglais : Nuclear fusion reactor, Magnetic confinement fusion, Tokamak, Limiter, Beryllium, Coatings, Deposition, Plasma gun, Electric breakdown, Damaging, Erosion, Strength, Mechanical properties, Stress analysis, Thermomechanical stress, Digital simulation, Calculation code, Finite element method
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 91-0478796
Code Inist : 001D06D04E. Création : 199406.