Thermal fatigue damage in monofilament reinforced copper for heat sink applications in divertor elements

Schöbel, M.; Jonke, J.; Degischer, H. P.; Paffenholz, V.; Brendel, A.; Wimpory, R.C.; Michiel, Marco Di

doi:10.1016/j.jnucmat.2010.12.242

Cited by 12 publications

(10 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The W-wires of Ø % 140 mm were coated with matrix material by magnetron sputtering in a thickness suitable to achieve a volume fraction of approximately 20 vol%. MFRMs with graded W-Cu interfaces exhibit higher bonding strength in pure Cu-matrix compared to other designs investigated in previous work [8,9] . The gradually matrix coated wires were filled parallel into a cylindrical container and consolidated by hot isostatic pressing with 100 MPa at 650 8C (HIP).…”

Section: Materials Descriptionmentioning

confidence: 58%

“…[6,7] W-wire reinforced Cu appears as the most promising material due to good interface bonding strength even without interface modifications compared to the weakly bonded brittle SiC-fibers. Processing of MRFM with the ductile W-wires did not show fiber cracking as observed in Cu/SiC/20 m. [8] The CTE mismatch between Cu (17 ppm Á K À1 ) and W (4.5 ppm Á K À1 ) will lead to internal stresses in the MFRM. Micro stress amplitudes of %360 MPa in the matrix (%80 vol%) and 1 440 MPa in the wires (%20 vol%) can be expected in wire direction, neglecting any matrix plastification (relaxation) or transversal components (Hoop, radial, and Poisson) according to the elastic slab model.…”

Section: State Of the Artmentioning

confidence: 81%

“…Micro stress amplitudes of %360 MPa in the matrix (%80 vol%) and 1 440 MPa in the wires (%20 vol%) can be expected in wire direction, neglecting any matrix plastification (relaxation) or transversal components (Hoop, radial, and Poisson) according to the elastic slab model. [5,8] However, the micro stress situation in a well bonded Cu/W/20 m composite with graded interface design will develop a multi axial stress condition: cylindrical stress distributions around each fiber overlapping with those of the neighboring fibers.…”

Section: State Of the Artmentioning

confidence: 99%

“…The samples were measured in transmission through the diameter using a 6 Â 6 Â 2 mm 3 gauge volume [8] . The center 2u-angle of the 2D 3 He-detector window (256 Â 256 pix, 300 Â 300 mm 2 ) was set to %86.58 recording Cu {3 1 1}, {2 2 2}, and W {2 2 0} reflections simultaneously.…”

Section: Neutron Diffractionmentioning

confidence: 99%

See 3 more Smart Citations

Thermal Cycling Stresses in W‐Monofilament Reinforced Copper

et al. 2011

View full text Add to dashboard Cite

New materials have to be developed for fusion reactor systems to withstand the high thermal load and heavy irradiation under service conditions. The divertor element collects the residuals of the nuclear reaction and withdraws heat from the reaction chamber into a heat sink. A thermal flux of ≈20 W mK−1 can be expected in such components. A plasma facing W plate is attached to a CuCrZr heat sink suffering CTE mismatch stresses at the interface due to pulsed operation required for the Tokamak reactor design. Fiber reinforced metal matrix composites are applied as an interlayer to reduce macroscopic interfacial stresses in these components. W‐wire reinforced copper is a promising material for this application due to a good fiber‐matrix bonding strength which is further increased by surface etching or graded interface designs. Thermal stresses in between the matrix and the wires are responsible for thermal fatigue damage within the constituents and at their interface. Neutron and synchrotron diffraction was performed in situ during thermal cycling to determine the micro stress amplitudes and their changes under simulated service conditions.

show abstract

Section: Materials Descriptionmentioning

confidence: 58%

Section: State Of the Artmentioning

confidence: 81%

Section: State Of the Artmentioning

confidence: 99%

Section: Neutron Diffractionmentioning

confidence: 99%

See 2 more Smart Citations

Thermal Cycling Stresses in W‐Monofilament Reinforced Copper

et al. 2011

View full text Add to dashboard Cite

show abstract

“…• Plasma-facing, but also heat-extracting divertor components developed as interlayer materials for the new ITER fusion reactor have been studied in order to nd matrix alloys, ber materials and an optimal interface design to achieve high mechanical strength and small thermal expansion mismatch for long-term stability (Schöbel et al, 2011). …”

Section: Applicationsmentioning

confidence: 99%

E3: Residual Stress Neutron Diffractometer at BER II

Boin

Wimpory

2016

JLSRF

View full text Add to dashboard Cite

The E3 residual stress neutron di ractometer operated at Helmholtz-Zentrum Berlin (HZB) is designed for studies in material science and engineering applications. Recent upgrade activities have made the instrument faster and more adaptable to di erent types of measurement. Thus, E3 has become more attractive to a broad user community, including industry, and increased substantially its scienti c output.

show abstract