Advances in Thermoset Injection Molding Part IV: Knitline and Elevated Temperature Properties in Thermoset Composites

Atkins, Kenneth E.; Seats, R.L.; Montagné, M.; Behar, G.

doi:10.4271/930172

Cited by 1 publication

(1 citation statement)

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“…Another disadvantage within the IM-LSI process is the formation of so-called weld or knit lines during the thermoset injection molding. The negative effect of weld lines on the mechanical and optical properties in thermoplastics and thermosets is well known and has been long investigated 15,16 . Kurr defines weld lines as the meeting of melt fronts of at least two different mass streams.…”

Section: Accepted Articlementioning

confidence: 99%

Thermoset IM‐LSI‐based C/C‐SiC: Influence of flow direction and weld lines on microstructure and mechanical properties

Stiller

Nestler

Ahmad

et al. 2020

Int J Applied Ceramic Tech

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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. 6 mm 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 Accepted Article This article is protected by copyright. All rights reserved and weld lines on microstructural and mechanical properties. Afterwards, the CFRP samples were converted to C/C-SiC composites by the liquid silicon infiltration process. The article addresses the flow behaviour 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.

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Section: Accepted Articlementioning

confidence: 99%