Pitch Precursor Carbon Fibers

Diefendorf, R. J.

doi:10.1016/b0-08-042993-9/00041-3

Cited by 16 publications

(11 citation statements)

References 50 publications

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“…These values are much lower (by an order of magnitude) than those reported for high performance CF. However, they are very close to the values of 33 GPa reported for the isotropic pitch CF 31 or 41 GPa for so-called "high ductility pitch-based" CF. 25 As the lignin precursor was not significantly stretched during processing, the CFs studied here can also be considered as isotropic fibers.…”

Section: Fiber Morphologysupporting

confidence: 82%

“…Strain at failure is within 0.7-1.2%, which is rather typical for the CFs. 30,31 The obtained elastic modulus is pretty similar for all fiber batches, varying within 25-33 GPa. These values are much lower (by an order of magnitude) than those reported for high performance CF.…”

Section: Fiber Morphologymentioning

confidence: 91%

“…25 As the lignin precursor was not significantly stretched during processing, the CFs studied here can also be considered as isotropic fibers. However, the strength of the lignin CF is still lower than that of isotropic pitch based CFs (700-800 MPa) 31 or "high ductility pitchbased" CFs (1100 MPa). 25 …”

Section: Fiber Morphologymentioning

confidence: 97%

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Mechanical characterization and application of Weibull statistics to the strength of softwood lignin‐based carbon fibers

Nordström¹,

Joffe

Sjöholm³

2013

J of Applied Polymer Sci

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Mechanical characterization of the first generation of softwood kraft lignin-based carbon fibers (CF) was carried out. The single-fiber tensile tests of filaments with different diameters and length were performed to evaluate stiffness and strength of carbon fibers. The average mechanical properties were measured as follows: tensile strength of approximately 300 MPa, the elastic modulus of 30 GPa and a strain at failure within interval of 0.7-1.2%. The fiber strength data was evaluated by the two-parameter Weibull statistics and parameters of this distribution were obtained. Although strength of the produced fibers is still significantly lower than that of commercially available, the experimental results and predictions based on Weibull statistics show a fairly good fit.

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Section: Fiber Morphologysupporting

confidence: 82%

Section: Fiber Morphologymentioning

confidence: 91%

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Mechanical characterization and application of Weibull statistics to the strength of softwood lignin‐based carbon fibers

Nordström¹,

Joffe

Sjöholm³

2013

J of Applied Polymer Sci

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“…According to the literature, the stiffness of carbon fibres generally increases with increasing strain [21,24,[30][31][32]. This phenomenon was found to be entirely reversible and is attributed to orientation of the lamellar crystallites.…”

Section: Carbon Fibresmentioning

confidence: 95%

The influence of non-linear elasticity on the determination of Weibull parameters using the fibre bundle tensile test

Möser

Weber

Rossoll

et al. 2003

Composites Part A: Applied Science and Manufacturing

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We address the influence of individual fibre stress-strain non-linearity on the extraction of Weibull-parameters from fibre bundle tensile tests. We extend the statistical theory of fibre bundle strength to include the non-linear elastic behaviour observed in many technically important fibres, e.g. glass-, carbon-, and alumina-fibres. It is shown that neglecting this non-linearity may lead to significant errors in determining the shape and scale parameters of the fibre fracture strength Weibull-distribution. A refinement of the existing extraction technique, accounting for this effect, is presented. The error resulting from neglecting the non-linear behaviour is assessed through a parametric study of the Weibull parameters for different levels of non-linearity. Explicit calculations are performed for two fibres of technical importance, namely Nextel 610e a-alumina fibre and a T300 carbon fibre. q

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“…Much research has been done to develop and understand the mechanism of pore‐filling by resin impregnation and chemical vapor infiltration (CVI) techniques. 5–9 The densification mechanism depends on the structure of voids or pores in a carbonaceous composite. Recently, Gao et al 10 investigated the change of the void structure in carbon–carbon laminates during densification by multiple resin impregnation, multiple CVI, 11 and their alternative techniques 12 and also pointed out the importance of an optimum densification technique.…”

Section: Introductionmentioning

confidence: 99%

Effect of resin impregnation methods at the early stage of densification on the impregnation efficiency, microstructure, and thermal stability of carbon–carbon composites

Cho

Ahn

Lee

2002

J of Applied Polymer Sci

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ABSTRACT:The effect of impregnation methods and heat-treatment temperature at the early stage of densification on the impregnation efficiency, microstructure, and thermal stability of carbon-carbon composites prepared from carbon-phenolic green composites was studied. The results suggest that simultaneous application of pressure and heat provides better impregnation performance during densification at the early stage of carbon-carbon composite fabrication than ultrasonic impregnation and vacuum infiltration impregnation. Also, optical microscopic examination strongly supports the result of the impregnation efficiency obtained using three different resin impregnation methods. An additional heat-treatment at 2000°C after carbonization results in better thermal stability and a denser microstructure of the fiber and matrix of the composite. For the carbonized composites, including a fully cured furfuryl alcohol resin impregnant, the weight loss measured by a thermogravimetric method quantitatively agrees with the weight loss occurred in a carbonization furnace at the corresponding temperature.

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Pitch Precursor Carbon Fibers

Cited by 16 publications

References 50 publications

Mechanical characterization and application of Weibull statistics to the strength of softwood lignin‐based carbon fibers

Mechanical characterization and application of Weibull statistics to the strength of softwood lignin‐based carbon fibers

The influence of non-linear elasticity on the determination of Weibull parameters using the fibre bundle tensile test

Effect of resin impregnation methods at the early stage of densification on the impregnation efficiency, microstructure, and thermal stability of carbon–carbon composites

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