Faserschonende Carbonfaserproduktion durch innovatives Galetten-Oberflächen-Design - CarboGerd

2021 ◽  
Vol 68 (3-4) ◽  
Author(s):  
Lukas Lechthaler ◽  
Felix Pohlkemper ◽  
Marie-Isabell Glaubke ◽  
Kees Egbers ◽  
Thomas Gries ◽  
...  
Keyword(s):  
Carbon Fibre ◽  
Anisotropic Material ◽  
Static Friction ◽  
Fibre Production ◽  
Prototype System ◽  
Carbon Fibres ◽  
Transverse Stress ◽  
Material Behaviour ◽  
Fibre Direction ◽  
Transverse Stresses

While carbon fibres can easily absorb forces in the fibre direction, they are extremely sensitive to transverse stress due to their anisotropic material behaviour. During the manufacturing process, unavoidable transverse stresses are induced in the fibre by the drive and deflection godets, which can damage or destroy individual filaments of the roving. The demand for a surface that is gentle on the fibre is offset by the static friction required between the fibre and the godet in order to drive the fibre. The aim of the CarboGerd research project is therefore to develop and validate an optimal godet coating for fibre-protecting and quality-assuring carbon fibre production. For this purpose, both typical coatings (ceramic, Topocrom coatings) and unconventional solutions (elastomer, PACVD coatings) are being tribologically investigated on a laboratory scale and validated on a prototype system.

scholarly journals An Overview of Impregnation Methods for Carbon Fibre Reinforced Thermoplastics

2017 ◽  
Vol 742 ◽  
pp. 473-481 ◽  
Author(s):  
Thomas Köhler ◽  
Tim Röding ◽  
Thomas Gries ◽  
Gunnar Seide
Keyword(s):  
Carbon Fibre ◽  
High Performance ◽  
Fibre Production ◽  
Matrix Composites ◽  
Carbon Fibres ◽  
Reinforced Plastics ◽  
Thermoplastic Matrix ◽  
Economic Production ◽  
The Matrix ◽  
Reinforced Thermoplastics

Carbon fibre reinforced plastics (CFRPs) can be classified according to whether the matrix is a thermoset or a thermoplastic. Thermoset-matrix composites are by tradition far more common, but thermoplastic-matrix composites are gaining in importance. There are several techniques for combining carbon fibres with a thermoplastic-matrix system. The composite’s characteristics as well as its manufacturing costs are dependent on the impregnation technique of the carbon fibre and the textile structure respectively. Carbon fibre reinforced thermoplastics (CFRTPs) are suitable for fast and economic production of high-performance components. Despite the higher material costs thermoplastic-matrix systems show cost benefits in comparison to thermoset-matrix due to substantial time savings in the production process. Moreover CFRTPs can be manufactured in large production runs. The commingling of reinforcement fibres with matrix fibres is a well-established process. Another approach is the coating of the carbon fibre with a thermoplastic subsequent to the carbon fibre production (carbonization, activation and deposition of sizing). The latter point is currently subject of research and is a promising method for further increasing the production speed. This paper presents the different possibilities of impregnating carbon fibres with a thermoplastic matrix. Diverse technologies along the process chain of the CFRTP production will be discussed.

Upscaling of lignin precursor melt spinning by bicomponent spinning and its use for carbon fibre production

2021 ◽  
Vol 379 (2209) ◽  
Author(s):  
Lars Bostan ◽  
Omid Hosseinaei ◽  
Renate Fourné ◽  
Axel S. Herrmann
Keyword(s):  
Carbon Fibre ◽  
Melt Spinning ◽  
Black Liquor ◽  
Tensile Modulus ◽  
Fibre Production ◽  
Pilot Scale ◽  
Carbon Fibres ◽  
New Approach ◽  
Main Challenge ◽  
Spin Carrier

Upscaling lignin-based precursor fibre production is an essential step in developing bio-based carbon fibre from renewable feedstock. The main challenge in upscaling of lignin fibre production by melt spinning is its melt behaviour and rheological properties, which differ from common synthetic polymers used in melt spinning. Here, a new approach in melt spinning of lignin, using a spin carrier system for producing bicomponent fibres, has been introduced. An ethanol extracted lignin fraction from LignoBoost process of commercial softwood kraft black liquor was used as feedstock. After additional heat treatment, melt spinning was performed in a pilot-scale spinning unit. For the first time, biodegradable polyvinyl alcohol (PVA) was used as a spin carrier to enable the spinning of lignin by improving the required melt strength. PVA-sheath/lignin-core bicomponent fibres were manufactured. Afterwards, PVA was dissolved by washing with water. Pure lignin fibres were stabilized and carbonized, and tensile properties were measured. The measured properties, tensile modulus of 81.1 ± 3.1 GPa and tensile strength of 1039 ± 197 MPa, are higher than the majority of lignin-based carbon fibres reported in the literature. This new approach can significantly improve the melt spinning of lignin and solve problems related to poor spinnability of lignin and results in the production of high-quality lignin-based carbon fibres. This article is part of the theme issue ‘Bio-derived and bioinspired sustainable advanced materials for emerging technologies (part 2)’.

Carbon fibre production during hydrogen plasma etching of diamond films

RSC Advances ◽  
2016 ◽  
Vol 6 (69) ◽  
pp. 64421-64427 ◽  
Author(s):  
I. Villalpando ◽  
P. John ◽  
S. Porro ◽  
J. I. B. Wilson
Keyword(s):  
Carbon Fibre ◽  
Plasma Etching ◽  
Hydrogen Plasma ◽  
Diamond Films ◽  
Fibre Production ◽  
Carbon Fibres ◽  
Carbon Fibre Production

Different morphology of carbon fibres have been synthesised on diamond films by hydrogen plasma etching in the presence of silicon.

Oil palm lignin under subcritical phenol conditions as precursor for carbon fibre production

2020 ◽  
Author(s):  
Khalidatul Athirah Khalid ◽  
Vijayaletchumy Karunakaran ◽  
Norfahana Abd-Talib ◽  
Khairul Faizal Pa’ee ◽  
Woei Yenn Tong ◽  
...  
Keyword(s):  
Carbon Fibre ◽  
Oil Palm ◽  
Fibre Production ◽  
Carbon Fibre Production

Tensometry of carbon fibres and elastomers at the diffractometer at BL20B of the Photon Factory

1998 ◽  
Vol 5 (3) ◽  
pp. 958-961
Author(s):  
D. C. Creagh ◽  
P. M. O'Neill ◽  
R. J. Mills ◽  
S. A. Holt
Keyword(s):  
Carbon Fibre ◽  
Duty Cycle ◽  
Simultaneous Recording ◽  
The Other ◽  
Imaging Plate ◽  
Relaxation Processes ◽  
Carbon Fibres ◽  
Fixed Rate ◽  
Photon Factory ◽  
System Use

Two systems have been developed for the simultaneous recording of the SAXS and the WAXS patterns from carbon fibre and elastomer samples which are placed under stress. The systems have been designed to fit inside the versatile vacuum diffractometer (BIGDIFF) at the Photon Factory. In one system, use is made of the ability to move the imaging-plate cassette. In the other, use has been made of an imaging-plate changer which can deliver up to 13 plates into position with a duty cycle of about 60 s. In this case each imaging plate can record SAXS/WAXS patterns in the range 0.5–20° due to the passage of the beam through the specimen which is mounted in a specially designed tensometer. Because BIGDIFF is a vacuum diffractometer and parasitic scattering is small, exposure times as short as 2 s can give acceptable SAXS/WAXS patterns. The systems have been used for the study of both the change of structure with strain, and the relaxation processes which occur as a result of the sample being strained at a fixed rate by a predetermined amount.

Electrocoating of carbon fibres: A route for interface control in carbon fibre reinforced poly methylmethacrylate?

2005 ◽  
Vol 65 (10) ◽  
pp. 1564-1573 ◽  
Author(s):  
Alexander Bismarck ◽  
Adam F. Lee ◽  
A. Sezai Saraç ◽  
Eckhard Schulz ◽  
Karen Wilson
Keyword(s):  
Carbon Fibre ◽  
Carbon Fibres ◽  
Interface Control

PROCESSING OF ULTRA-HIGH TEMPERATURE CERAMIC MATRIX COMPOSITES (UHTCMCS) THROUGH RF ENHANCED CHEMICAL VAPOUR INFILTRATION (RF-CVI)

2021 ◽  
Author(s):  
VINOTHINI VENKATACHALAM, ◽  
JON BINNER ◽  
THOMAS REIMER ◽  
BUCKARD ESSER ◽  
STEFANO MUNGIGUERRA ◽  
...  
Keyword(s):  
High Temperature ◽  
Carbon Fibre ◽  
Chemical Vapor Infiltration ◽  
Matrix Composites ◽  
Carbon Fibres ◽  
Temperature Oxidation ◽  
Ceramic Phase ◽  
Wide Range ◽  
The University ◽  
Ultra High Temperature

Carbon fibre (Cf) reinforced Ultra High Temperature Ceramic (UHTC) Matrix Composites (UHTCMCs) have proven to be excellent materials that can survive nearly 3000°C in highly oxidizing environments along with a good specific strength. Consequently, they have excellent potential for use in aerospace applications such as rocket nozzle throats and thermal protection systems (TPS). Due to the presence of the carbon fibres, UHTCMCs offer high strength and modulus combined with excellent thermal shock behaviour whilst the presence of the ultra-high temperature ceramic phase protects the carbon fibres at the application temperatures. High temperature oxidation, thermal ablation behaviour and mechanical properties of the UHTCMC’s relies heavily on the bonding between the carbon fibre and matrices especially the oxides formed to avoid any progressive failure and predict the life of the components. In the present investigation, a radio frequency assisted chemical vapor infiltration (RF-CVI) technique has been used to make the 2.5D Cf reinforced ZrB2, ZrB2/carbon matrices composites with various interphase materials. The advantage of RF heating is that it creates an inverse temperature profile in the sample, which means that the infiltration starts from inside and progresses outwards. This allows the time needed for processing to be reduced very significantly compared to the conventional CVI process. This presentation will report on the latest results from the research that has been undertaken at the University of Birmingham, including the results from a wide range of testing that has been undertaken at both DLR in Germany and the University of Naples in Italy.

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