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Thermoset IM‐LSI‐based C/C‐SiC: Influence of flow direction and weld lines on microstructure and mechanical properties
Author(s) -
Stiller Jonas,
Nestler Daisy,
Ahmad Husam,
Päßler Erik,
Wagner Guntram,
Kroll Lothar
Publication year - 2020
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.13668
Subject(s) - materials science , thermosetting polymer , composite material , microstructure , weld line , transfer molding , molding (decorative) , ceramic , fabrication , epoxy , welding , mold , medicine , alternative medicine , pathology
The production of ceramic matrix composites (CMC) based on C/C‐SiC is still very cost‐intensive and therefore only economical for a few applications. The fabrication of the preforms involves many costs that need to be reduced. In this work, the shaping of the CFRP‐preforms is realized by thermoset injection molding, which enables large‐scale production. The polymeric matrix used is a multi‐component matrix consisting of novolak resin, curing agent and lubricant. Six millimeter chopped carbon fiber with a proportion of 50 wt.% were used as a reinforcement. These ingredients are processed by an industrial equipment for compounding and injection molding in order to manufacture a CFRP demonstrator representing a brake disc. Test specimens are cut out of the demonstrator in different directions in order to investigate influences of flow direction and weld lines on microstructural and mechanical properties. Afterward, the CFRP samples were converted to C/C‐SiC composites by the liquid silicon infiltration process. The article addresses the flow behavior of the compound during the injection molding and the building of the weld lines in the demonstrator. In addition, results of the directional dependence of the microstructural and mechanical properties within the fabricated disc in the different production steps are presented.