He-cooled demo divertor: Design verification testing against mechanical impact loads

Norajitra, P.; Boccaccini, Lorenzo Virgilio; Kuzmic, Momir; Maione, Ivan Alessio; Spatafora, Luigi

doi:10.1016/j.fusengdes.2012.02.049

Cited by 5 publications

(7 citation statements)

References 6 publications

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“…DEMO) will be subjected to unprecedented high thermal loads of up to 10-20 MW/m 2 and high neutron fluxes [1,2]. Tungsten has been proposed as a potentially suitable armour material due to a beneficially high melting point, high thermal conductivity and high yield and shear stress [3][4][5]. However undesirable characteristics of tungsten include high brittleness, high hardness and a high ductile to brittle transition temperature (DBTT).…”

Section: Introductionmentioning

confidence: 99%

Brazing development and interfacial metallurgy study of tungsten and copper joints with eutectic gold copper brazing alloy

Easton

Zhang

Wood

et al. 2015

Fusion Engineering and Design

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This version is available at https://strathprints.strath.ac.uk/53935/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the Strathprints administrator: strathprints@strath.ac.ukThe Strathprints institutional repository (https://strathprints.strath.ac.uk) is a digital archive of University of Strathclyde research outputs. It has been developed to disseminate open access research outputs, expose data about those outputs, and enable the management and persistent access to Strathclyde's intellectual output. Current proposals for the divertor component of a thermonuclear fusion reactor include tungsten and copper as potentially suitable materials. This paper presents the procedures developed for the successful brazing of tungsten to oxygen free high conductivity (OFHC) copper using a fusion appropriate gold based brazing alloy, Orobraze 890 (Au80Cu20). The objectives were to develop preparation techniques and brazing procedures in order to produce a repeatable, defect free butt joint for tungsten to copper. Multiple brazing methods were utilised and brazing parameters altered to achieve the best joint possible. Successful and unsuccessful brazed specimens were sectioned and analysed using optical and scanning electron microscopy, EDX analysis and ultrasonic evaluation. It has been determined that brazing with Au80Cu20 has the potential to be a suitable joining method for a tungsten to copper joint. Brazing Development and Interfacial Metallurgy Study of Tungsten and Copper Joints with Eutectic Gold Copper Brazing Alloy

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Section: Introductionmentioning

confidence: 99%

Brazing development and interfacial metallurgy study of tungsten and copper joints with eutectic gold copper brazing alloy

Easton

Zhang

Wood

et al. 2015

Fusion Engineering and Design

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“…Tungsten and tungsten alloys have been considered as primary candidate materials for helium cooled DEMO divertor and possibly for protection of helium cooled first wall in DEMO applications [1][2][3][4]. This is directly related to their attractive physical properties, namely, high melting point, high thermal conductivity, high ultimate tensile strength, high yield and shear strength and relatively low coefficient of thermal expansion [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…This is directly related to their attractive physical properties, namely, high melting point, high thermal conductivity, high ultimate tensile strength, high yield and shear strength and relatively low coefficient of thermal expansion [1,2]. Joining tungsten divertor components to other suitable structural materials is critical to the success of DEMO and high temperature brazing has been chosen as one of suitable joining technologies [1,3,4].…”

Section: Introductionmentioning

confidence: 99%

“…Joining tungsten divertor components to other suitable structural materials is critical to the success of DEMO and high temperature brazing has been chosen as one of suitable joining technologies [1,3,4]. In the developing HEMJ divertor design [2], each of the cooling fingers consists of a W tile for shielding and a W-1%La 2 O 3 (WL10) thimble for heat sinking. The fingers are connected to a reduced activation ferriticmartensitic (RAFM) EUROFER steel body by brazing.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, other dissimilar material properties such as the Young's moduli and yield stress, in combination with the http://dx.doi.org/10.1016/j.jnucmat.2014.07.058 0022-3115/Ó 2014 Elsevier B.V. All rights reserved. mismatch in thermal expansion coefficient, results in high residual stresses in the joint regions as a result of the joining process [2]. Kalin [6] developed a brazing process to join W to a ferritic/martensitic steel for use on Helium-cooled divertors and other plasma facing components.…”

Section: Introductionmentioning

confidence: 99%

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Interfacial metallurgy study of brazed joints between tungsten and fusion related materials for divertor design

Zhang¹,

Galloway²,

Wood³

et al. 2014

Journal of Nuclear Materials

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In the developing DEMO divertor, the design of joints between tungsten to other fusion related materials is a significant challenge as a result of the dissimilar physical metallurgy of the materials to be joined. This paper focuses on the design and fabrication of dissimilar brazed joints between tungsten and fusion relevant materials such as EUROFER 97, oxygen-free high thermal conductivity (OFHC) Cu and SS316L using a gold based brazing foil. The main objectives are to develop acceptable brazing procedures for dissimilar joining of tungsten to other fusion compliant materials and to advance the metallurgical understanding within the interfacial region of the brazed joint. Four different butt-type brazed joints were created and characterised, each of which were joined with the aid of a thin brazing foil (Au80Cu19Fe1, in wt.%). Microstructural characterisation and elemental mapping in the transition region of the joint was undertaken and, thereafter, the results were analysed as was the interfacial diffusion characteristics of each material combination produced. Nano-indentation tests are performed at the joint regions and correlated with element composition information in order to understand the effects of diffused elements on mechanical properties. The experimental procedures of specimen fabrication and material characterisation methods are presented. The results of elemental transitions after brazing are reported. Elastic modulus and nano-hardness of each brazed joints are reported

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Thermal design of helium cooled divertor for reliable operation

Lee

Kim

et al. 2017

Applied Thermal Engineering

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He-cooled demo divertor: Design verification testing against mechanical impact loads

Cited by 5 publications

References 6 publications

Brazing development and interfacial metallurgy study of tungsten and copper joints with eutectic gold copper brazing alloy

Brazing development and interfacial metallurgy study of tungsten and copper joints with eutectic gold copper brazing alloy

Interfacial metallurgy study of brazed joints between tungsten and fusion related materials for divertor design

Thermal design of helium cooled divertor for reliable operation

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