Combined Magnetron Sputtering and Ion Implantation (CMSII) technology was used for W coating of carbon based materials for the first wall in fusion devices. Due to the low hydrogen diffusivity and very small volume of W in the coated layer, the gaseous hydrogen permeation measurement at 400?C was selected for the experimental technique, where increasing & decreasing transient and steady state permeation flux was monitored. Problems that could arise with the CFC membrane sealing were overcome by deposition of the identical W layer on the 0.5 mm Eurofer substrate.
COBISS.SI-ID: 24636967
Beryllium films will be applied in fusion reactors as the first wall tile coating. The morphology, adhesion and thermal stability of these thin films deposited by the thermionic vacuum arc (TVA) method are compatible with extremely high demands. Results of hydrogen permeation through 8 micrometer thick Be films deposited by the TVA method on Eurofer membranes exposed to hydrogen are presented. The permeation flux was determined on five samples at 400°C and 1 bar hydrogen pressure. The permeation reduction factor (PRF) was between 83 and 15, compared to the uncoated membrane.
COBISS.SI-ID: 24629799
The study is focused on the modelling of surface processes with H2 molecules in both ground and vibrationally excited state and with H atoms.A simple kinetic model has been developed to estimate the particle fluxes formed by vibrational excitation and dissociation of hydrogen on metal surfaces, at low pressures and low temperatures. Good agreement with the experiment and with the independent Monte Carlo simulation confirm that the model grasps well the main of the underlying physical processes at cold edge of fusion plasmas.
COBISS.SI-ID: 1545467
We have performed Ar+ broad ion beam sputtering of a polycrystalline Fe–Si alloy at normal incidence at energies varying from 6 to 10 keV. Sputtering results in the formation of etch pits, which can be classified in three shapes: triangular, rectangular, and square. As each grain of individual orientation exhibits a certain type of pattern, the etch pits were correlated with the crystal orientations by electron backscattered diffraction technique.
COBISS.SI-ID: 812714
Electrical steel (Fe-Si-Al alloy) surfaces were subjected to Ar+ ion beam irradiation at 10 keV and off-normal sputtering conditions. The morphologies present were visualized by SEM: ripples oriented parallel and perpendicular to the ion beam direction, smooth surfaces and rough faceted surfaces. Energy dispersive spectroscopy (EDS) results show that individual grains are compositionally homogeneous. Crystal grain orientation was determined with electron backscatter diffraction (EBSD). Results show that grains with similar orientation in the normal (Z) direction behave in a similar way.
COBISS.SI-ID: 802730