Surface engineering of SiCf/SiC composites by selective thermal removal

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...

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Bibliographic Details
Published inInternational journal of applied ceramic technology Vol. 14; no. 3; pp. 287 - 294
Main Authors Valenza, Fabrizio, Casalegno, Valentina, Gambaro, Sofia, Muolo, Maria Luigia, Passerone, Alberto, Salvo, Milena, Ferraris, Monica
Format Journal Article
LanguageEnglish
Published Malden Wiley Subscription Services, Inc 01.05.2017
Subjects
Brazing alloys
Ceramic fiber reinforced ceramics
Composite materials
composites
Contact angle
Copper
Heat treatment
joints/joining
Silicon carbide
Silver
Wetting
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Summary: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.
ISSN:1546-542X
1744-7402
DOI:10.1111/ijac.12618