The fibre/matrix interface and its influence on mechanical and physical properties of Cu-MMC

Peters, P.W.M.; Hemptenmacher, J.; Schurmann, Hartmut

doi:10.1016/j.compscitech.2010.04.007

Cited by 23 publications

(19 citation statements)

References 13 publications

(17 reference statements)

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“…[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.…”

Section: State Of the Artmentioning

confidence: 99%

Thermal Cycling Stresses in W‐Monofilament Reinforced Copper

et al. 2011

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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.

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Section: State Of the Artmentioning

confidence: 99%

Thermal Cycling Stresses in W‐Monofilament Reinforced Copper

et al. 2011

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“…First step in production is the fiber coating with an interlayer followed by Cu or CuCrZr matrix material deposition by magnetron sputtering or galvanic Cu coating in thickness dependent on the required volume fraction. The coated fibers are filled into a preform encapsulated in a matrix tube and compacted by hot isostatic pressing (HIP) at 600-700°C with 100-120 MPa for Cu and at 750-850°C with 100-170 MPa for CuCrZr matrices [7]. Samples resulted with a MFRM core of Ø $ 3 mm for neutron diffraction and Ø $ 1.2 mm for synchrotron diffraction/tomography.…”

Section: Materials Descriptionmentioning

confidence: 99%

“…Pure Cu as well as CuCrZr (Cr $ 0.7 wt.%; Zr $ 0.1 wt.%) matrices were tested [6][7][8][9][10]. The MFRM samples were produced by Deutsches Zentrum für Luft-und Raumfahrt (DLR) and some by Max Planck Institute (IPP) in cooperation with European Aeronautic Defence and Space Company (EADS) [7,12]. First step in production is the fiber coating with an interlayer followed by Cu or CuCrZr matrix material deposition by magnetron sputtering or galvanic Cu coating in thickness dependent on the required volume fraction.…”

Section: Materials Descriptionmentioning

confidence: 99%

“…Micro stresses are generated in the composite between the metal matrix and the reinforcement during changing temperatures [4]. The bonding between the fibers and the matrix has to withstand the stress created in service conditions therefore SiC and W monofilaments in Cu [5] and CuCrZr matrices [6,7] with different interface designs [8,9] have been investigated. Tensile tests, acoustic emission and heat flux tests were performed to correlate the interface bonding strength with thermal properties of the composites [10].…”

Section: Introductionmentioning

confidence: 99%

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

Schöbel¹,

Jonke²,

Degischer³

et al. 2011

Journal of Nuclear Materials

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“…1 a): monofilaments of approximately 0.1 mm in diameter (e.g. SiC) are embedded uni-or bidirectionally within a metallic matrix by diffusion bonding (Leyens et al, 2003;Brendel et al, 2007;Peters et al, 2010). -Continuous fibre reinforced metals (CFRM) (Fig.…”

Section: Types Of MMCmentioning

confidence: 99%