Experimental investigation of alumina coating as tritium permeation barrier for molten salt nuclear reactors

Zheng, Guiqiu; Carpenter, David; Dolan, Kieran; Hu, Lin‐Wen

doi:10.1016/j.nucengdes.2019.110232

Cited by 21 publications

(9 citation statements)

References 17 publications

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“…The concentration of active sites available at any instant of time S ½ is given by Equation (35), where S 0 is the initial concentration of active sites, Al À S ½ is the concentration of sites occupied by aluminium, Al 2 O 3 À S ½ is the concentration of sites occupied by alumina, and Fe 2 O 3 À S ½ is the concentration of sites occupied by iron oxide.…”

Section: Specie Mass Balance Solvermentioning

confidence: 99%

“…[27] The general techniques used for alumina coating on carbon steels are physical vapour deposition, chemical vapour deposition (CVD), sol-gel, plasma electrolytic oxidation, thermal spray, and pack cementation. [27][28][29][30][31][32][33][34][35][36][37][38] In the present work, a fluidizationbased CVD process is employed owing to its ability to achieve simultaneous deposition of alumina on inner and outer surfaces of a tubular carbon steel substrate. Fluidized bed sublimation and induction heating are employed to optimize precursor inventory.…”

Section: Introductionmentioning

confidence: 99%

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Fluidization‐based chemical vapour deposition for alumina coating on tubular carbon steel substrates—Modelling and validation

et al. 2022

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The degradation of carbon steels due to corrosion and gaseous permeation phenomena can be significantly reduced by a thin alumina coating. Tubular carbon steel structures, commonly employed in nuclear establishments are particularly vulnerable to chemical degradation on the inner surface due to the flow of corrosive fluids. In the present work, a fluidization-based chemical vapour deposition process is applied as a one-step solution for simultaneous chemical passivation of both inner and outer substrate surfaces meanwhile optimizing precursor inventory by utilizing fluidized bed sublimation and induction heating techniques. The process is studied by using a 2D-1D mathematical model, which has been validated with experimental results for different carbon steel grades. It was observed that there exists an optimum fluidization velocity for a specified initial mass fraction of precursor powder at which mass of alumina deposited per unit mass of precursor sublimated is maximized.

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Section: Specie Mass Balance Solvermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fluidization‐based chemical vapour deposition for alumina coating on tubular carbon steel substrates—Modelling and validation

et al. 2022

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“…At high temperatures, tritium readily diffuses into metal structures such as the reactor pressure vessel, piping, and heat exchangers, eventually creating transport pathways through the reactor and opening up the possibility of environmental release. Zheng et al 151 found that alumina coatings on 316 SS tubing significantly reduced the permeability of tritium. Tritium permeation barriers deposited via plasma thermal spray and consisting of a NiCr topcoat, a NiCr + alumina bond coat, and a 316 SS substrate were exposed to neutron irradiation to study their tritium permeation at 700 °C, proving successful at decreasing the tritium's permeability.…”

Section: Tbc Applicationsmentioning

confidence: 99%

Thermal Barrier Coatings Overview: Design, Manufacturing, and Applications in High-Temperature Industries

Mondal

Nuñez

Myer

et al. 2021

Ind. Eng. Chem. Res.

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Today's competitive world economy is creating an indispensable demand for increased efficiency of engineering components that operate in harsh environments (i.e., very high-temperature, corrosive, or neutron irradiation environments), for applications in the energy, automotive, aerospace, electronics, and power industries. Increased research is being done on thermal barrier coatings (TBCs) for protecting such components, since the versatility of manufacturing techniques and the scale of deployment result in increased life, economics, performance, and durability. This review focuses on the advances that led to using TBCs for component life extension and, more recently, as an integral part of advanced component design for high-temperature and other types of harsh environments, such as those found in nuclear-related applications. Factors that led to state-of-the-art advanced coating-fabrication techniques [e.g., electron-beam physical vapor deposition (EB-PVD), plasma spray deposition, and electrophoretically deposited TBCs, as well as functionally graded material (FGM) manufacturing] have also been emphasized in current coating R&D. This review explores the current state of TBCs, i.e., the latest advances regarding their fabrication and performance, associated challenges, and recommendations for their future use in aerospace, nuclear, high-temperature, or otherwise harsh environments.

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“…A test blanket module (TBM) with the main function of tritium breeding is indispensable [3]. To ensure a steady-state operation of a fusion reactor tritium self-sufficiency is important, which is ensured by the nuclear reaction between neutron and lithium [4]. Tritium has strong permeability in the structural material (RAFM), due to * Author to whom any correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

Au-ion irradiation effects on microstructure and deuterium permeation resistance of Al/Al₂O₃ coating

Zhang¹,

Deng²,

Zhu³

et al. 2022

Nucl. Fusion

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Al/Al2O3 coating with a total thickness of approximately 3 μm was irradiated by 6 MeV Au-ions with the damage level from 13 to 39 dpa at room temperature. The results showed that the surface roughness of the Al/Al2O3 coating decreased with increasing irradiation damage levels. As the irradiation damage level is up to 39 dpa, the crystallinity of the Al2O3 layer is enhanced, and the irradiation-induced defects such as voids and dislocations appeared in the Al/Al2O3 coating. The decreased hardness and the deterioration of deuterium permeation resistance are strongly associated with the changed microstructure. The underlying mechanism for the evolution of microstructure and properties induced by Au-ions irradiation is discussed.

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Experimental investigation of alumina coating as tritium permeation barrier for molten salt nuclear reactors

Cited by 21 publications

References 17 publications

Fluidization‐based chemical vapour deposition for alumina coating on tubular carbon steel substrates—Modelling and validation

Fluidization‐based chemical vapour deposition for alumina coating on tubular carbon steel substrates—Modelling and validation

Thermal Barrier Coatings Overview: Design, Manufacturing, and Applications in High-Temperature Industries

Au-ion irradiation effects on microstructure and deuterium permeation resistance of Al/Al₂O₃ coating

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Experimental investigation of alumina coating as tritium permeation barrier for molten salt nuclear reactors

Cited by 21 publications

References 17 publications

Fluidization‐based chemical vapour deposition for alumina coating on tubular carbon steel substrates—Modelling and validation

Fluidization‐based chemical vapour deposition for alumina coating on tubular carbon steel substrates—Modelling and validation

Thermal Barrier Coatings Overview: Design, Manufacturing, and Applications in High-Temperature Industries

Au-ion irradiation effects on microstructure and deuterium permeation resistance of Al/Al2O3 coating

Contact Info

Product

Resources

About

Au-ion irradiation effects on microstructure and deuterium permeation resistance of Al/Al₂O₃ coating