Paper Titles
The Influence of Stress and Heat on the Transformation Behaviour of NiTi for Actuator Applications in Extruded Aluminium Matrix Composites
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Development and Characterisation of Phenolic Resin Moulding Materials for the Production of New Short Fibre-Reinforced C/C-SiC Composites
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Development and Characterisation of Phenolic Resin Based Liquid Silicon Infiltrated SiC/SiC Composites with SiNx Fibre Coating
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The Evaluation of Thermoplastic Precursors for C/C-SiC Manufactured by Liquid Silicon Infiltration (LSI)
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Investigation of Different Phenolic Resins and their Behavior during Pyrolysis to Form SiC/C-Composites
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Influence of Specimen Geometry and Surface Quality on the Bending Strength of Short Fiber-Reinforced C/SiC
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Development of a SiNx-Based Barrier Coating for SiC Fibres
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Development of a Silicon-Infiltrated Silicon Carbide (SiSiC) Friction Layer by the Doctor-Blade Technique Using a Computer-Optimized Calculation for the Packing Density
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Investigation of Different Phenolic Resins and their Behavior during Pyrolysis to Form SiC/C-Composites

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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, 1,3,5,7tetraazatricyclo [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 2furanmethanol (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 LSI.

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Periodical:

Materials Science Forum (Volumes 825-826)

Pages:

240-248

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.825-826.240

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Online since:

July 2015

Authors:

Lydia Wöckel*, Thomas Ebert, Bernd Mainzer, Martin Frieß, Dietmar Koch, Kristina Roder, Daniel Wett, Daisy Nestler, Guntram Wagner, Stefan Spange

Keywords:

Carbon Precursor, NMR Measurements, Phenolic Resin, Raman Spectroscopy, Rheology, SiC/C-Composites

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© 2015 Trans Tech Publications Ltd. All Rights Reserved

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