Abstract
Al-SiC coatings obtained by vacuum plasma spraying co-deposition are considered as a new class of plasma-facing materials (PFMs) for fusion devices. The technical requirements for PFMs are stringent, since they have to withstand severe operation conditions, including bombardment by high fluxes of particles escaping the plasma. A number of Al-SiC coatings (containing 20 or 50wt.% SiC) deposited on Cu, stainless steel or graphite substrates were irradiated under laboratory conditions with high doses of deuterium or He ions. The surface properties of the materials were characterized before and after irradiation using several analytical techniques (Rutherford backscattering, nuclear reaction analysis, secondary ion mass spectrometry, Auger electron spectroscopy, energy-dispersive spectroscopy, microscopic methods and laser profilometry). Exposure to low-energy deuterium ions or deuterium plasma resulted in the implantation of 7–9 × 10 16 D cm -2 in the near-surface layer. The initial steps of blister formation were also observed. Changes in the surface structure were noted following irradiation with 5He + ions (1.7–2 MeV). Damage in the surface layer of the materials was dependent on the ion flux.
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