Characterization of less common nitrides as potential permeation barriers

0500425 - ÚFP 2020 RIV NL eng J - Journal Article
Matějíček, Jiří - Veverka, Jakub - Nemanič, V. - Cvrček, L. - Lukáč, František - Havránek, Vladimír - Illková, Ksenia
Characterization of less common nitrides as potential permeation barriers.
Fusion Engineering and Design. Roč. 139, February 2019 (2019), s. 74-80. ISSN 0920-3796. E-ISSN 1873-7196
R&D Projects: GA ČR(CZ) GA14-12837S; GA MŠMT LM2015056
EU Projects: European Commission(XE) 633053 - EUROfusion
Institutional support: RVO:61389021 ; RVO:61389005
Keywords : Adhesion * Hydrogen permeation barriers * Nitrides * Permeation measurement * Physical vapor deposition * Residual stress
OECD category: Materials engineering
Impact factor: 1.692, year: 2019
Method of publishing: Limited access
https://www.sciencedirect.com/science/article/pii/S0920379618308214?via%3Dihub

In a fusion reactor, the transport of hydrogen isotopes (primarily tritium) has to be controlled, from the point of view of fuel balance and retention in the reactor components, which can result in material degradation and spreading of radioactivity. To suppress this, tritium permeation barriers are developed. Suitable materials for the permeation barriers are those with low hydrogen isotope permeability - primarily ceramic materials, such as oxides, carbides and nitrides. In this study, coatings of six less common nitrides prepared by physical vapor deposition – namely AlCrN, CrN, Cr2N, CrWN, WN and ZrN – were investigated. Besides basic characterization (elemental and phase composition, surface morphology and coating thickness), hydrogen permeation, adhesion, residual stress and thermal expansion were evaluated. All coatings were dense, crack-free and well adherent. The permeation reduction factor which was determined at 400 °C and 1 bar ranged from ˜102 to ˜5 × 103, the best performance being achieved by the ZrN coating. As these materials seem not to be investigated as hydrogen permeation barriers, they have a very high potential to be further improved
Permanent Link: http://hdl.handle.net/11104/0292506