Development of Protective Coatings to Reduce Hydrogen and Tritium Permeation

Mühlratzer, August; Zeilinger, Hans; Esser, H.G.

doi:10.13182/nt84-a33479

Cited by 18 publications

(2 citation statements)

References 10 publications

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“…The modifications can be classified into three categories: surface oxidation of the metal construction materials, 2 metallic coating with low hydrogen permeability, such as molybdenum, 3 tungsten, 4 etc., [5][6][7][8][9][10] and nonmetallic coating, such as Al 2 O 3 , 11 TiN, 12 TiC, 13 and their composite films. [14][15][16] Sugizaki et al 12 found that nitrogen implantation into titanium significantly affected hydrogen absorption, which might be caused by the formation of TiN precipitation in the implanted layer.…”

mentioning

confidence: 99%

Hydrogen Impermeability of TiN Films and Its Dependence on Nitrogen Concentration at High Temperatures

Nishikiori

Ito

2001

J. Electrochem. Soc.

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The hydrogen impermeability of titanium nitride films and its dependence on nitrogen concentration have been estimated by molten salt electrochemical techniques at 723 K. Surface nitriding of titanium substrates was conducted by two methods, i.e., gas nitriding and molten salt electrochemical nitriding. Hydrogen concentration in the titanium nitride films was directly measured by elastic recoil detection (ERD) analysis. It was confirmed that the titanium nitride film worked as a hydrogen permeation barrier at high temperatures. When titanium coexisted with titanium nitrides, the hydrogen impermeability decreased with the increase of the volume concentration of titanium, which worked as the hydrogen-diffusing medium.

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confidence: 99%

Hydrogen Impermeability of TiN Films and Its Dependence on Nitrogen Concentration at High Temperatures

Nishikiori

Ito

2001

J. Electrochem. Soc.

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“…Al O 2 3 , as hydrogen permeation barriers were discussed and also investigated in other research topics, e.g. for high-temperature gas-cooled fission reactors [274,275]. Furthermore, it was noticed that the natural oxide layers on steels produced by preoxidation have an influence on the hydrogen permeation [276,277].…”

Section: Review On Hydrogen Isotope Permeation Barrier Layersmentioning

confidence: 99%

Development of advanced high heat flux and plasma-facing materials

et al. 2017

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Plasma-facing materials and components in a fusion reactor are the interface between the plasma and the material part. The operational conditions in this environment are probably the most challenging parameters for any material: high power loads and large particle and neutron fluxes are simultaneously impinging at their surfaces. To realize fusion in a tokamak or stellarator reactor, given the proven geometries and technological solutions, requires an improvement of the thermo-mechanical capabilities of currently available materials. In its first part this article describes the requirements and needs for new, advanced materials for the plasma-facing components. Starting points are capabilities and limitations of tungsten-based alloys and structurally stabilized materials. Furthermore, material requirements from the fusion-specific loading scenarios of a divertor in a water-cooled configuration are described, defining directions for the material development. Finally, safety requirements for a fusion reactor with its specific accident scenarios and their potential environmental impact lead to the definition of inherently passive materials, avoiding release of radioactive material through intrinsic material properties. The second part of this article demonstrates current material development lines answering the fusion-specific requirements for high heat flux materials. New composite materials, in particular fiber-reinforced and laminated structures, as well as mechanically alloyed tungsten materials, allow the extension of the thermo-mechanical operation space towards regions of extreme steady-state and transient loads. Self-passivating

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