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Investigation of different phenolic resins and their behavior during pyrolysis to form SiC/C-composites

Wöckel, Lydia and Ebert, Thomas and Mainzer, Bernd and Frieß, Martin and Koch, Dietmar and Roder, Kristina and Wett, Daniel and Nestler, Daisy and Wagner, Guntram and Spange, Stefan (2015) Investigation of different phenolic resins and their behavior during pyrolysis to form SiC/C-composites. In: Materials Science Forum, 825, pp. 240-248. Trans Tech Publications. 20. Symposium Verbundwerkstoffe und Werkstoffverbunde, 1.-3. Juli 2015, Wien / Österreich.

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Abstract

Specific phenolic resin samples have been developed as the carbon precursor for SiC/C composites. Liquid phenolic resins suitable for fiber-infiltration in the resin transfer moulding (RTM) process are synthesized by using versatile combination of the aromatic component (phenol, naphthalen-2-ol) with various formaldehyde equivalents such as methanal, 1,3,5,7-tetraazatricyclo[3.3.1.13,7]decane (urotropine), and 1,3,5-trioxane, under different reaction conditions. Room temperature liquid resoles (RTLR) are obtained by using an excess of the formaldehyde component over phenol (≥2) under basic conditions. Upon heating RTLR can form a crosslinked network even without addition of a hardening reagent. In addition, novolacs are synthesized under acidic conditions using a phenol/formaldehyde ratio ≥1. Nitrogen-containing resins contain nitrogen due to reaction of phenol with urotropine. Novolacs and nitrogen-containing resins are solids at room temperature and not self-curing. To infiltrate these both resins into SiC fibers in the RTM process, they are dissolved in 2-furanmethanol (furfuryl alcohol FA) and urotropine which is added as curing-agent. Both, the molecular weight and the amount of the dissolved phenolic resin have an influence on the viscosity and the carbon yield after pyrolysis which is important for this application. The aim was to create different phenolic resins for the fabrication in the RTM process and to characterize the carbon after pyrolysis with respect to the structure and porosity as these are key parameters to generate a stoichiometric SiC matrix by liquid silicon infiltration (LSI).

Item URL in elib:https://elib.dlr.de/102614/
Document Type:Conference or Workshop Item (Speech)
Title:Investigation of different phenolic resins and their behavior during pyrolysis to form SiC/C-composites
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Wöckel, Lydialydia.woeckel (at) chemie.tu-chemnitz.deUNSPECIFIED
Ebert, Thomasthomas.ebert (at) chemie.tu-chemnitz.deUNSPECIFIED
Mainzer, Berndbernd.mainzer (at) dlr.deUNSPECIFIED
Frieß, Martinmartin.friess (at) dlr.deUNSPECIFIED
Koch, Dietmardietmar.koch (at) dlr.deUNSPECIFIED
Roder, Kristinakristina.roder (at) mb.tu-chemnitz.deUNSPECIFIED
Wett, Danieldaniel.wett (at) mb.tu-chemnitz.deUNSPECIFIED
Nestler, Daisydaisy.nestler (at) mb.tu-chemnitz.deUNSPECIFIED
Wagner, Guntramguntram.wagner (at) mb.tu-chemnitz.deUNSPECIFIED
Spange, Stefanstefan.spange (at) chemie.tu-chemnitz.deUNSPECIFIED
Date:2015
Journal or Publication Title:Materials Science Forum
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:Yes
Volume:825
Page Range:pp. 240-248
Editors:
EditorsEmail
Edtmaier, Christianchristian.edtmaier@tuwien.ac.at
Requena, Guillermoguillermo.requena@tuwien.ac.at
Publisher:Trans Tech Publications
Status:Published
Keywords:phenolic resin, carbon precursor, NMR measurements, rheology, SiC/C-composites, Raman spectroscopy
Event Title:20. Symposium Verbundwerkstoffe und Werkstoffverbunde
Event Location:Wien / Österreich
Event Type:international Conference
Event Dates:1.-3. Juli 2015
Organizer:Deutsche Gesellschaft für Materialkunde
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures and Materials
Location: Stuttgart
Institutes and Institutions:Institute of Structures and Design > Ceramic Composite Structures
Deposited By: Mainzer, Bernd
Deposited On:28 Jan 2016 12:44
Last Modified:09 Feb 2017 19:22

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