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Abstract

In the effort to evaluate boron-rich coatings as plasma-facing surfaces in fusion devices, a new process for applying boron carbide (B(4)C) coatings to graphite was developed. The process entails eutectic melting of the carbon (C) substrate surface with a precursor layer of B(4)C particles. Adherent coatings were achieved which consisted of two layers: a surface layer and a graded penetration zone in the outer portion of the substrate. The surface-layer microstructure was multiphase and ranged from reaction-sintered structures of sintered B(4)C particles in an eutectic formed matrix to that of hypereutectic carbon particles in a B(4)C-C eutectic matrix. Because of high surface energy, the coatings generally developed a nonuniform thickness. Quantitative evaluations of the coatings were performed with limiters in the TEXTOR fusion device and with coupons in electron beam tests. Test results revealed good adherence of the coating even after remelting and, during remelting, diagnostics detected a corresponding interaction of boron with the plasma.

Additional information

Authors: VALENTINE P G, General Atomics, Advanced Technology Group, San Diego (US);TRESTER P W, General Atomics, Advanced Technology Group, San Diego (US);WINTER J, Forschungszentrum Jülich GmbH (KFA), Institut für Plasmaphysik (DE);DUWE R, Forschungszentrum Jülich GmbH (KFA), Institut für Plasmaphysik (DE);WALLURA E, Forschungszentrum Jülich GmbH (KFA), Institut für Plasmaphysik (DE);PHILIPPS V, Forschungszentrum Jülich GmbH (KFA), Institut für Plasmaphysik (DE);LINKE J, Forschungszentrum Jülich GmbH (KFA), Institut für Reaktorwerkstoffe (DE)
Bibliographic Reference: Article: Journal of Nuclear Materials, Vols. 212-215 (1994) pp. 1146-1152
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