Influence of the grain structure of yttria thin films on the hydrogen isotope permeation

Engels, J.; Houben, A.; Hansen, P.; Rasiński, M.; Linsmeier, Ch.

doi:10.1016/j.ijhydene.2018.09.191

Cited by 14 publications

(10 citation statements)

References 27 publications

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“…Due to the higher resistance of the oxidized target, the deposition voltage in the reacted mode (<100 V) is lower than in the hot metallic mode (>300 V). [165] Dependent on the mode used, the mismatch of the CTE between steel and oxide ceramic can lead to cracking. To reduce the surface temperature differences between the deposition process and the subsequent experiments, the substrate surfaces are heated up to %300 C for hot metallic mode.…”

Section: Permeation Barriersmentioning

confidence: 99%

“…Figure 17a,b mainly shows the difference between (hot) metallic mode and reactive mode, and Figure 17c also shows the option of a layered system. [165] While considering the different coatings, one of the main outcomes of the studies at Forschungszentrum Jülich GmbH can be summarized as follows.…”

Section: Permeation Barriersmentioning

confidence: 99%

“…The PRF varies clearly with the microstructure of the coating in the order of up to a factor of 100. [165] Due to the difference in the coating process, control of the microstructure can be achieved, e.g., hot metallic versus reacted mode (Figure 17). The thin films grow in the reacted deposition mode in an equiaxed grain structure and in the hot metallic mode in a columnar grain structure.…”

Section: Permeation Barriersmentioning

confidence: 99%

“…The PRF varies clearly with the microstructure of the coating in the order of up to a factor of 100 . Due to the difference in the coating process, control of the microstructure can be achieved, e.g., hot metallic versus reacted mode (Figure ).…”

Section: Materials For Fusionmentioning

confidence: 99%

“…The hot metallic mode with substrate surface heating during the deposition process, the cold metallic mode without this surface heating, and the reacted mode also without this surface heating. Due to the higher resistance of the oxidized target, the deposition voltage in the reacted mode (<100 V) is lower than in the hot metallic mode (>300 V) . Dependent on the mode used, the mismatch of the CTE between steel and oxide ceramic can lead to cracking.…”

Section: Materials For Fusionmentioning

confidence: 99%

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Fusion Materials Development at Forschungszentrum Jülich

Coenen

2020

Adv Eng Mater

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Material issues pose a significant challenge for the design of future fusion reactors. From a historic point of view, the material mix used for the first wall of a fusion reactor has continually evolved, from original steel vessels to carbon and other low-Z materials such as beryllium to tungsten as the primary candidate for a reactor's first wall armor and divertor material. For materials considered for fusion applications, a highly integrated approach is necessary. Resilience against neutron damage, good power exhaust, and oxidation resistance during accidental air ingress are design relevant issues while deciding on new materials or improving upon baseline materials. Neutron-induced effects, e.g., transmutation adding to embrittlement, retention, and changes to thermomechanical properties, are crucial to material performance. In this contribution, the recent progress (2013-2019) in fusion materials development for current and future fusion devices, at Forschungszentrum Jülich GmbH, with activities focussing on advanced materials and their characterization is given. It is a continuation and extension of the work given by Coenen et al.

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Section: Permeation Barriersmentioning

confidence: 99%

Section: Permeation Barriersmentioning

confidence: 99%

Section: Permeation Barriersmentioning

confidence: 99%

Section: Materials For Fusionmentioning

confidence: 99%

Section: Materials For Fusionmentioning

confidence: 99%

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Fusion Materials Development at Forschungszentrum Jülich

Coenen

2020

Adv Eng Mater

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Layer-structured Cr/CrxN coating via electroplating-based nitridation achieving high deuterium resistance as the hydrogen permeation barrier

Zheng

Zhou

et al. 2022

J Adv Ceram

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Hydrogen isotope permeation through structural materials is a key issue for developing nuclear fusion energy, which will cause fuel loss and radioactive pollution. Developing ceramic coatings with high thermal shock and hydrogen resistance is an effective strategy to solve this issue. In this work, a layer-structured Cr/CrxN coating was successfully fabricated by a facile electroplating-based nitridation technique, which is easy, facile, and applicable to coating complex-shaped substrates. The Cr/CrxN coating, composed of a bottom Fe/Cr interdiffusion zone, a middle Cr layer, and a top CrxN layer, exhibits high bonding strength, high anti-thermal-shock ability, and high deuterium permeation resistance. Its bonding strength achieves 43.6 MPa. The Cr/CrxN coating remains intact even after suffering 300 thermal shock cycles under a 600 °C-water condition. Through optimizing the nitridation temperature, the Cr/CrxN coating achieves a deuterium permeation reduction factor (PRF) as high as 3599 at 500 °C. Considering its scalable fabrication technique and considerable properties, the developed Cr/CrxN coating may serve as a novel high-performance hydrogen permeation barrier in various fields.

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Ceramic Coatings for Fusion Reactors

Chikada¹

2020

Comprehensive Nuclear Materials

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Influence of the grain structure of yttria thin films on the hydrogen isotope permeation

Cited by 14 publications

References 27 publications

Fusion Materials Development at Forschungszentrum Jülich

Fusion Materials Development at Forschungszentrum Jülich

Layer-structured Cr/CrxN coating via electroplating-based nitridation achieving high deuterium resistance as the hydrogen permeation barrier

Ceramic Coatings for Fusion Reactors

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