5-9 September 2016
Prague Congress Centre
Europe/Prague timezone

P2.174 SiC-fibre reinforced tungsten-based composites for divertor

6 Sep 2016, 14:20
1h 40m
Foyer 2A (2nd floor), 3A (3rd floor) (Prague Congress Centre)

Foyer 2A (2nd floor), 3A (3rd floor)

Prague Congress Centre

5. května 65, Prague, Czech Republic
Board: 174
Poster I. Materials Technology P2 Poster session

Speaker

Petra Jenus (Department for Nanostructured Materials)

Description

Tungsten-based composites have gained considerable attention owing to their excellent performance levels at high temperatures due to exceptional high temperature properties such as a high melting point, good thermal conductivity and a low thermal expansion coefficient.  However, tungsten is also associated with a serious reduction in its strength at elevated temperatures, which is also one of the main drawbacks of tungsten for being used as a plasma facing material in fusion reactors. The main objective of this research is to develop a technique for fabrication of long fibre-reinforced tungsten, with the aim to overcome the main drawback of the tungsten as a material for divertor. The materials were prepared from tungsten powder with a small addition of TiH2 powder, a Cp-Ti foil and C-coated SiC fibres with 100 µm diameter. In this stage, the fraction of the fibres was kept small (<10 %) and the C-coating was used to prevent/minimize the unwanted chemical reaction between SiC fibres and W matrix. The samples (150 mm x 100 mm) were prepared by laying-up the material into tooling using three different sequences and compacted with a hot isostatic press. The characterisation of the prepared samples comprised of macro- and microstructural analysis, X-ray diffraction analysis and measurements of mechanical properties (bend strength and hardness).  We have observed that the fibres appeared to be distributed unevenly in the composites which did not contain the Cp-Ti foil. It was also seen that the fibre reinforcement causes increased porosity and a decrease in the composites density when compared to the matrix composed of only W powder.

Co-authors

Aljaz Ivekovic (Department for Nanostructured Materials, Jožef Stefan Institute, Ljubljana, Slovenia) Matej Kocen (Department for Nanostructured Materials, Jožef Stefan Institute, Ljubljana, Slovenia) Petra Jenus (Department for Nanostructured Materials, Jožef Stefan Institute, Ljubljana, Slovenia) Renny Moss (TISICS Ltd, 22 Invincible Road, Farnborough, United Kingdom) Sasa Novak Krmpotic (Department for Nanostructured Materials, Jožef Stefan Institute, Ljubljana, Slovenia;Jožef Stefan International Postgraduate School, Jamova cesta 39, Ljubljana, Slovenia) Stephen Kyle-Henney (TISICS Ltd, 22 Invincible Road, Farnborough, United Kingdom)

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