New WC-Cu composites for the divertor in fusion reactors

Marta R. Dias, N. Pinhão, R. Faustino, R. M. S. Martins, A. S. Ramos, M. T. Vieira, J. B. Correia, E. Camacho, F. M. Braz Fernandes, Bruno M. F. Nunes, Amélia Almeida, U. V. Mardolcar, Eduardo P. Alves

Research output: Contribution to journalArticle

Abstract

The requirements for the divertor components of future fusion reactors are challenging and therefore a stimulus for the development of new materials. In this paper, WC-Cu composites are studied for use as thermal barrier between the plasma facing tungsten tiles and the copper-based heat sink of the divertor. Composite materials with 50% vol. WC were prepared by hot pressing and characterized in terms of microstructure, density, expansion coefficient, elastic modulus, Young's modulus and thermal diffusivity. The produced materials consisted of WC particles homogeneously dispersed in a Cu matrix with densifications between 88% and 98%. The sample with WC particles coated with Cu evidenced the highest densification. The thermal diffusivity was significantly lower than that of pure copper or tungsten. The sample with higher densification exhibits a low value of Young's modulus (however, it is higher compared to pure copper), and an average linear thermal expansion coefficient of 13.6 × 10−6 °C-1 in a temperature range between 100 °C and 550 °C. To estimate the behaviour of this composite in actual conditions, a monoblock of the divertor in extreme conditions was modelled. The results predict that while the use of WC-Cu interlayer leads to an increase of 190 °C on the temperature of the upper part of the monoblock when compared to a pure Cu interlayer, the composite will improve and reduce significantly the cold-state stress between this interlayer and the tungsten.

Original languageEnglish
Pages (from-to)31-37
Number of pages7
JournalJournal of Nuclear Materials
Volume521
DOIs
Publication statusPublished - 1 Aug 2019

Fingerprint

fusion reactors
Fusion reactors
Tungsten
densification
Densification
Copper
interlayers
modulus of elasticity
tungsten
composite materials
Elastic moduli
Thermal diffusivity
Composite materials
thermal diffusivity
copper
hot pressing
tiles
heat sinks
Heat sinks
Hot pressing

Keywords

  • Densification
  • Hot pressing
  • Modelling
  • Thermal diffusivity
  • WC-Cu composite

Cite this

Dias, M. R., Pinhão, N., Faustino, R., Martins, R. M. S., Ramos, A. S., Vieira, M. T., ... Alves, E. P. (2019). New WC-Cu composites for the divertor in fusion reactors. Journal of Nuclear Materials, 521, 31-37. https://doi.org/10.1016/j.jnucmat.2019.04.026
Dias, Marta R. ; Pinhão, N. ; Faustino, R. ; Martins, R. M. S. ; Ramos, A. S. ; Vieira, M. T. ; Correia, J. B. ; Camacho, E. ; Braz Fernandes, F. M. ; Nunes, Bruno M. F. ; Almeida, Amélia ; Mardolcar, U. V. ; Alves, Eduardo P. / New WC-Cu composites for the divertor in fusion reactors. In: Journal of Nuclear Materials. 2019 ; Vol. 521. pp. 31-37.
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Dias, MR, Pinhão, N, Faustino, R, Martins, RMS, Ramos, AS, Vieira, MT, Correia, JB, Camacho, E, Braz Fernandes, FM, Nunes, BMF, Almeida, A, Mardolcar, UV & Alves, EP 2019, 'New WC-Cu composites for the divertor in fusion reactors', Journal of Nuclear Materials, vol. 521, pp. 31-37. https://doi.org/10.1016/j.jnucmat.2019.04.026

New WC-Cu composites for the divertor in fusion reactors. / Dias, Marta R.; Pinhão, N.; Faustino, R.; Martins, R. M. S.; Ramos, A. S.; Vieira, M. T.; Correia, J. B.; Camacho, E.; Braz Fernandes, F. M.; Nunes, Bruno M. F.; Almeida, Amélia; Mardolcar, U. V.; Alves, Eduardo P.

In: Journal of Nuclear Materials, Vol. 521, 01.08.2019, p. 31-37.

Research output: Contribution to journalArticle

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AU - Dias, Marta R.

AU - Pinhão, N.

AU - Faustino, R.

AU - Martins, R. M. S.

AU - Ramos, A. S.

AU - Vieira, M. T.

AU - Correia, J. B.

AU - Camacho, E.

AU - Braz Fernandes, F. M.

AU - Nunes, Bruno M. F.

AU - Almeida, Amélia

AU - Mardolcar, U. V.

AU - Alves, Eduardo P.

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N2 - The requirements for the divertor components of future fusion reactors are challenging and therefore a stimulus for the development of new materials. In this paper, WC-Cu composites are studied for use as thermal barrier between the plasma facing tungsten tiles and the copper-based heat sink of the divertor. Composite materials with 50% vol. WC were prepared by hot pressing and characterized in terms of microstructure, density, expansion coefficient, elastic modulus, Young's modulus and thermal diffusivity. The produced materials consisted of WC particles homogeneously dispersed in a Cu matrix with densifications between 88% and 98%. The sample with WC particles coated with Cu evidenced the highest densification. The thermal diffusivity was significantly lower than that of pure copper or tungsten. The sample with higher densification exhibits a low value of Young's modulus (however, it is higher compared to pure copper), and an average linear thermal expansion coefficient of 13.6 × 10−6 °C-1 in a temperature range between 100 °C and 550 °C. To estimate the behaviour of this composite in actual conditions, a monoblock of the divertor in extreme conditions was modelled. The results predict that while the use of WC-Cu interlayer leads to an increase of 190 °C on the temperature of the upper part of the monoblock when compared to a pure Cu interlayer, the composite will improve and reduce significantly the cold-state stress between this interlayer and the tungsten.

AB - The requirements for the divertor components of future fusion reactors are challenging and therefore a stimulus for the development of new materials. In this paper, WC-Cu composites are studied for use as thermal barrier between the plasma facing tungsten tiles and the copper-based heat sink of the divertor. Composite materials with 50% vol. WC were prepared by hot pressing and characterized in terms of microstructure, density, expansion coefficient, elastic modulus, Young's modulus and thermal diffusivity. The produced materials consisted of WC particles homogeneously dispersed in a Cu matrix with densifications between 88% and 98%. The sample with WC particles coated with Cu evidenced the highest densification. The thermal diffusivity was significantly lower than that of pure copper or tungsten. The sample with higher densification exhibits a low value of Young's modulus (however, it is higher compared to pure copper), and an average linear thermal expansion coefficient of 13.6 × 10−6 °C-1 in a temperature range between 100 °C and 550 °C. To estimate the behaviour of this composite in actual conditions, a monoblock of the divertor in extreme conditions was modelled. The results predict that while the use of WC-Cu interlayer leads to an increase of 190 °C on the temperature of the upper part of the monoblock when compared to a pure Cu interlayer, the composite will improve and reduce significantly the cold-state stress between this interlayer and the tungsten.

KW - Densification

KW - Hot pressing

KW - Modelling

KW - Thermal diffusivity

KW - WC-Cu composite

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Dias MR, Pinhão N, Faustino R, Martins RMS, Ramos AS, Vieira MT et al. New WC-Cu composites for the divertor in fusion reactors. Journal of Nuclear Materials. 2019 Aug 1;521:31-37. https://doi.org/10.1016/j.jnucmat.2019.04.026