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Abstract

Boron carbide plus silicon carbide (B(4)C-SiC) reaction-sintered coatings have been developed for use on graphite plasma-facing components. Such coatings are of interest in the TEXTOR tokamak limiter-plasma interactions as a means of reducing carbon erosion, of providing a preferred release of boron for oxygen gettering, and of investigating silicon's effect on radiative edge phenomena. Specimens evaluated had: (i) either Ringsdorfwerke EK 98 graphite or Le Carbone Lorraine felt-type AEROLOR A05 CFC substrates; (ii) multiphase coatings, comprising B(4)C, SiC, and graphite; (iii) nominal coating compositions of 69 wt% B(4)C + 31 wt% SiC; (iv) nominal coating thicknesses between 250 and 775 microns. Coated coupons were evaluated by high heat flux experiments in the JUDITH (electron beam) test facility at KFA. Simulated disruptions, with energy densities up to 10 MJ/m2, and normal operation simulations, with power densities up to 12 MW/m2, were conducted. The coatings remained adherent; at the highest levels tested, minor changes occurred, including localised remelting, modification of the crystallographic phases, occasional microcracking, and erosion.

Additional information

Authors: VALENTINE P G ET AL., General Atomics, San Diego, California (US);WINTER J ET AL., Forschungszentrum Jülich GmbH (KFA) (DE)
Bibliographic Reference: Article: Journal of Nuclear Materials, Vols. 220-222 (1995) pp. 756-761
Record Number: 199510899 / Last updated on: 1995-08-10
Category: PUBLICATION
Original language: en
Available languages: en
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