Manufacturing and high heat-flux testing of brazed actively cooled mock-ups with Ti-doped graphite and CFC as plasma-facing materials
Abstract
In the frame of the EU project ExtreMat new Ti-doped isotropic graphites and carbon fibre-reinforced carbons (CFCs) with high thermal conductivity and reduced chemical erosion were brazed to a CuCrZr heat-sink to produce flat-tile actively cooled mock-ups (MUs). Brazing was done using a low CTE interlayer to shift the stresses to the metal-metal interface. These MUs were exposed to high heat-fluxes in the electron beam facility JUDITH. Screening tests were conducted increasing the heat load stepwise up to 15 MW m-2, followed by 100 cycles at 15 MW m-2, subsequent screening up to 20 MW m-2 and 100 cycles at 20 MW m-2. All MUs withstood screening at 15 MW m-2 and most of them survived screening at 20 MW m-2. Ti-doped CFC MUs showed a significant improvement compared with the undoped reference CFC, surviving several cycles at 20 MW m-2 on all tiles. One of the Ti-doped graphite MUs withstood 100 cycles at 20 MW m-2 on one tile, representing a promising result.
- Publication:
-
Physica Scripta Volume T
- Pub Date:
- December 2009
- DOI:
- 10.1088/0031-8949/2009/T138/014062
- Bibcode:
- 2009PhST..138a4062G