1 / 9

Diamond based Composites for Collimators Contribution to EuCard

Explore the innovative use of diamond-based composites in collimators for EuCard, fabricated through a liquid metal infiltration process with key considerations including thermal conductivity and net-shape solutions.

rmcduff
Download Presentation

Diamond based Composites for Collimators Contribution to EuCard

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Diamond based Composites for Collimators Contribution to EuCard L. Weber Laboratory for Mechanical MetallurgyEcole Polytechnique Fédérale de Lausanne (EPFL) CH-1015, Lausanne, Switzerland

  2. Liquid metal infiltration process • Alternative routes: • hot pressing of powder mixtures • hot pressing of coated particles

  3. Pressure infiltration apparatus • Cold wall vessel (250 bar, 200°C) Inner side of the wall in contact with a water cooled heat shield • Induction heating (using a graphite susceptor) • primary vacuum pump (0.1 mbar) • Crucible can be lowered on quench (directional solidification) 100 mm

  4. Mono-crystalline diamond • Low nitrogen level • Relatively large size (>100µm) Selected diamond grit

  5. Diamond particle size: the larger the better the TC • Limited machinability => Need for net-shape solutions • Size of the net-shape parts • Radiation damage in Diamonds • CTE varies strongly with temperature • Electrical conductivity rather low (5-10 MS/m) Critical issues

  6. Diamond composites: 60-75 vol-% diamond + Al, Ag, Cu • Parts: fabrication capacity established for plates in Ag-Si diamond and Al-diamond • size: 80*300*10 mm3 • Expected thermal conductivity (@RT): • >800 W/mK for Ag-Si composites • >600 W/mK for Al based composites Materials & parts

  7. Cu-B composites: First results: CTE

  8. Ag-3Si composites: First results: CTE

  9. Brazing of SiC on diamond composites • Thermal fatigue of SiC brazed on substrate • Mechanical tests • Thermal conductivity measurement: • 3 setups: 0-40°C, 4-300 K, 100-500 K Other tasks

More Related