Surface engineering based on the Selective Thermal Removal (STR) of SiC fibers from SiCf/SiC composites was used to obtain a brush-like surface in view of joining processes. As observed through 3D confocal microscopy, the thermal treatment led to a selective removal of the surface fibers so that the specific surface increased. Wetting tests were performed using a Ag–Cu–Ti brazing alloy. The STR led to a negligible increase in the contact angles, which ranged from 16° to 21° for as-received composites and increased to 28° for composites after STR. Microstructural observations showed that the brazing alloy perfectly adhered to the brush-like surfaces were giving a mechanical interlocking expected to enhance the strength of the joint.

Surface engineering of SiCf/SiC composites by selective thermal removal / Valenza, Fabrizio; Casalegno, Valentina; Gambaro, Sofia; Muolo, Maria Luigia; Passerone, Alberto; Salvo, Milena; Ferraris, Monica. - In: INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY. - ISSN 1546-542X. - 14:3(2017), pp. 287-294. [10.1111/ijac.12618]

Surface engineering of SiCf/SiC composites by selective thermal removal

CASALEGNO, VALENTINA;SALVO, Milena;FERRARIS, Monica
2017

Abstract

Surface engineering based on the Selective Thermal Removal (STR) of SiC fibers from SiCf/SiC composites was used to obtain a brush-like surface in view of joining processes. As observed through 3D confocal microscopy, the thermal treatment led to a selective removal of the surface fibers so that the specific surface increased. Wetting tests were performed using a Ag–Cu–Ti brazing alloy. The STR led to a negligible increase in the contact angles, which ranged from 16° to 21° for as-received composites and increased to 28° for composites after STR. Microstructural observations showed that the brazing alloy perfectly adhered to the brush-like surfaces were giving a mechanical interlocking expected to enhance the strength of the joint.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2667309
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