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Surface engineering of SiC f /SiC composites by selective thermal removal
Author(s) -
Valenza Fabrizio,
Casalegno Valentina,
Gambaro Sofia,
Muolo Maria Luigia,
Passerone Alberto,
Salvo Milena,
Ferraris Monica
Publication year - 2016
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.12618
Subject(s) - materials science , brazing , composite material , wetting , alloy , brush , thermal , contact angle , physics , meteorology
Surface engineering based on the Selective Thermal Removal ( STR ) of SiC fibers from SiC f /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.