High temperature stresses in brazed Glidcop/W model structures of interest for ITER divertor technology

Braham, C.; Coppola, R.; Nardi, C.; Valli, M.

doi:10.1016/j.fusengdes.2005.06.073

Cited by 6 publications

(6 citation statements)

References 4 publications

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“…Preprints (www.preprints.org) | NOT PEER-REVIEWED | Posted: 19 July 2018 doi:10.20944/preprints201807.0344.v1 6 The sputtering deposition parameters were varied in order to optimize the homogeneity of the coating. A pure Ar (99.0% purity) atmosphere was used to avoid oxidization of the sputtered layer during deposition.…”

Section: Methodsmentioning

confidence: 99%

“…Moreover, the study of the joining of Glidcop can be considered relevant, not only for the particle accelerator components, but also for other application fields, such as resistance welding electrodes, incandescent light bulb leads, hybrid circuit packages and other high temperature applications, such as x-ray tube components or heat exchanger components [5,6].…”

Section: Introductionmentioning

confidence: 99%

“…Several methods have been proposed to join Glidcop to such metals as Cu or stainless steel [7,8,9,10] and an assembly of Glidcop cooling pipes, coated with a sacrificial armor in pure W or W alloys has been obtained for the divertor component using TiCuAg alloy as the joining material [6], but to the best of the authors' knowledge, no joint between Glidcop and Mo has yet been manufactured or characterized. Of all the different joining technologies, the brazing process is known to play the most important role in the joining of Glidcop.…”

Section: Introductionmentioning

confidence: 99%

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Brazing of Mo to Glidcop Dispersion Strengthened Copper for Accelerating Structures

Casalegno¹,

Perero²,

Ferraris³

et al. 2018

Preprint

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Alumina dispersion-strengthened copper, Glidcop, is used widely in high-heat-load ultra-high-vacuum components for synchrotron light sources (absorbers), accelerator components (beam intercepting devices) and in nuclear power plants. Glidcop has similar thermal and electrical properties to OFE (oxygen free electrical) copper, but has superior mechanical properties, thus making it a feasible structural material; its yield and ultimate strength are equivalent to those of mild-carbon steel.The purpose of this work has been to develop a brazing technique to join Glidcop to Mo, using a commercial Cu-based alloy. The effects of the excessive diffusion of the braze along the grain boundaries on the interfacial chemistry and joint microstructure, as well Preprints (www.preprints.org) | NOT PEER-REVIEWED | Posted:

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Brazing of Mo to Glidcop Dispersion Strengthened Copper for Accelerating Structures

Casalegno¹,

Perero²,

Ferraris³

et al. 2018

Preprint

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“…Reference is made to [12][13][14] for a general presentation on the use of neutron diffraction for strain and stress determination and to [15][16][17][18][19] for applications to divertor components. The measurement of strains and stresses by neutron or X-ray diffraction is based on the well-known Bragg's law…”

Section: Experimental Techniquementioning

confidence: 99%

Neutron diffraction measurement of residual stresses in an ITER-like tungsten-monoblock type plasma-facing component

Coppola

Crescenzi

Gan

et al. 2019

Fusion Engineering and Design

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Neutron diffraction measurements have been carried out for non-destructive characterization and numerical predictions validation of the residual stresses in a mock-up of the ITER-like divertor target plasma-facing component, made by hot radial pressing of 4 tungsten blocks to a CuCrZr cooling pipe via a soft copper interlayer. The neutron diffraction measurements were carried out, at room temperature, at FRM II reactor in Garching. Stress-relieved W and CuCrZr were examined as reference state before joining. The 3D stress tensor was determined in one of the two external W-blocks and CuCrZr pipe segments, scanning the mock-up from the outer surface of the W block towards the inner wall of the CuCrZr pipe with the interval of 0.4-0.5 mm. A residual stress distribution from tension to compression through the bonding line is detected, as expected from the requirement of force balance. Except at the interlayer, stresses well below 100 MPa are found, confirming the good fabrication quality of the investigated monoblock. These experimental results are comparable with the FEM-based numerical prediction, but at the interlayer and inside the pipe a sharper spatial resolution is needed for the neutron diffraction measurements to catch the hoop and axial stress gradient profile.

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“…The authors have already investigated the joining of a CuZr alloy (UNS C15000, 80% cold worked) and Mo in the framework of the Compact Linear Collider (CLIC) project [ 4 ]; the accelerating structure is traditionally made of brazed oxygen free electrical (OFE) copper parts, but CuZr and Glidcop could represent improved alternatives for the conducting regions that suffer from to mechanical fatigue. Moreover, the study of the joining of Glidcop can be considered relevant, not only for the particle accelerator components, but also for other application fields, such as resistance welding electrodes, incandescent light bulb leads, hybrid circuit packages and other high temperature applications, such as X-ray tube components or heat exchanger components [ 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

Brazing of Mo to Glidcop Dispersion Strengthened Copper for Accelerating Structures

et al. 2018

View full text Add to dashboard Cite

Alumina dispersion-strengthened copper, Glidcop, is used widely in high-heat-load ultra-high-vacuum components for synchrotron light sources (absorbers), accelerator components (beam intercepting devices), and in nuclear power plants. Glidcop has similar thermal and electrical properties to oxygen free electrical (OFE) copper, but has superior mechanical properties, thus making it a feasible structural material; its yield and ultimate tensile strength are equivalent to those of mild-carbon steel. The purpose of this work has been to develop a brazing technique to join Glidcop to Mo, using a commercial Cu-based alloy. The effects of the excessive diffusion of the braze along the grain boundaries on the interfacial chemistry and joint microstructure, as well as on the mechanical performance of the brazed joints, has been investigated. In order to prevent the diffusion of the braze into the Glidcop alloy, a copper barrier layer has been deposited on Glidcop by means of RF-sputtering.

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High temperature stresses in brazed Glidcop/W model structures of interest for ITER divertor technology

Cited by 6 publications

References 4 publications

Brazing of Mo to Glidcop Dispersion Strengthened Copper for Accelerating Structures

Brazing of Mo to Glidcop Dispersion Strengthened Copper for Accelerating Structures

Neutron diffraction measurement of residual stresses in an ITER-like tungsten-monoblock type plasma-facing component

Brazing of Mo to Glidcop Dispersion Strengthened Copper for Accelerating Structures

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