Characterization of Low Thermal Conductivity Pan-Based Carbon Fibers PDF Download
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Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781722965990
Category :
Languages : en
Pages : 144
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Book Description
The microstructure and surface chemistry of eight low thermal conductivity (LTC) PAN-based carbon fibers were determined and compared with PAN-based fibers heat treated to higher temperatures. Based on wide-angle x ray diffraction, the LTC PAN fibers all appear to have a similar turbostratic structure with large 002 d-spacings, small crystallite sizes, and moderate preferred orientation. Limited small-angle x ray scattering (SAXS) results indicate that, with the exception of LTC fibers made by BASF, the LTC fibers do not have well developed pores. Transmission electron microscopy shows that the texture of the two LTC PAN-based fibers studied (Amoco T350/23X and /25X) consists of multiple sets of parallel, wavy, bent layers that interweave with each other forming a complex three dimensional network oriented randomly around the fiber axis. X ray photoelectron spectroscopy (XPS) analysis finds correlations between heat treated temperatures and the surface composition chemistry of the carbon fiber samples. Katzman, Howard A. and Adams, P. M. and Le, T. D. and Hemminger, Carl S. Unspecified Center CARBON FIBERS; HEAT TREATMENT; HIGH TEMPERATURE; LOW CONDUCTIVITY; MATERIALS TESTS; MICROSTRUCTURE; POLYACRYLONITRILE; SURFACE PROPERTIES; THERMAL CONDUCTIVITY; CRYSTALLITES; ELECTRON MICROSCOPY; PHOTOELECTRON SPECTROSCOPY; POROSITY; TRANSMISSION ELECTRON MICROSCOPY; X RAY DIFFRACTION; X RAY SCATTERING; X RAY SPECTROSCOPY...
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781722965990
Category :
Languages : en
Pages : 144
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Book Description
The microstructure and surface chemistry of eight low thermal conductivity (LTC) PAN-based carbon fibers were determined and compared with PAN-based fibers heat treated to higher temperatures. Based on wide-angle x ray diffraction, the LTC PAN fibers all appear to have a similar turbostratic structure with large 002 d-spacings, small crystallite sizes, and moderate preferred orientation. Limited small-angle x ray scattering (SAXS) results indicate that, with the exception of LTC fibers made by BASF, the LTC fibers do not have well developed pores. Transmission electron microscopy shows that the texture of the two LTC PAN-based fibers studied (Amoco T350/23X and /25X) consists of multiple sets of parallel, wavy, bent layers that interweave with each other forming a complex three dimensional network oriented randomly around the fiber axis. X ray photoelectron spectroscopy (XPS) analysis finds correlations between heat treated temperatures and the surface composition chemistry of the carbon fiber samples. Katzman, Howard A. and Adams, P. M. and Le, T. D. and Hemminger, Carl S. Unspecified Center CARBON FIBERS; HEAT TREATMENT; HIGH TEMPERATURE; LOW CONDUCTIVITY; MATERIALS TESTS; MICROSTRUCTURE; POLYACRYLONITRILE; SURFACE PROPERTIES; THERMAL CONDUCTIVITY; CRYSTALLITES; ELECTRON MICROSCOPY; PHOTOELECTRON SPECTROSCOPY; POROSITY; TRANSMISSION ELECTRON MICROSCOPY; X RAY DIFFRACTION; X RAY SCATTERING; X RAY SPECTROSCOPY...
Author: David Stuart Brookstein
Publisher:
ISBN:
Category : Carbon fibers
Languages : en
Pages :
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Extremely high thermal conductivity graphitic materials from mesophase pitch precursors (K-1100 fibers, four experimental high thermal conductivity fibers, and a ThermalGraph(R) panel) were examined utilizing X-ray diffraction (XRD) and high-resolution field emission (FE) scanning electron microscopy (SEM). Of the four experimental fibers, two were produced from Amoco's standard petroleum pitch, and two were produced from an Amoco experimental pitch precursor. The low d-spacings, narrow peaks, and presence of three-dimensional reflections in the XRD patterns of the five fibers and the ThermaiGraph(R) panel indicate that they are all highly graphitic. The thermal conductivities of these materials correlate best with the graphite inter-basal-plane spacing (d sub 002). All of the materials studied appear very graphitic in high-resolution SEM micrographs of their transverse fracture surfaces. Well-developed graphene layer planes are clearly seen. High-resolution SEM examination of the ThermalGraph(R) panel shows that the precursor fibers have coalesced into a continuous three-dimensional structure. The result of this fiber fusion is a "self-reinforced," graphitic structure.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 308
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Book Description
Author: Leighton H. Peebles
Publisher: CRC Press
ISBN: 1351087320
Category : Technology & Engineering
Languages : en
Pages : 260
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Book Description
Carbon Fibers presents an up-to-date review of the progress pertaining to the formation of carbon fibers from rayon, acrylic, and pitch precursors. The book emphasizes the preparation, characterization, and properties of commercial materials. It also considers the compressive properties of carbon fibers, the lack of correlation between surface characterization and fiber-matrix interactions, and the discrepancy between surface composition as determined by XPS and the reaction of surface groups with chemical reagents. Other topics discussed include:
Author: Viren Jayantibhai Patel
Publisher:
ISBN:
Category : Carbon fiber-reinforced plastics
Languages : en
Pages : 54
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Book Description
The purpose of this study was to manufacture and mechanically characterize low-cost carbon fiber derived from pitch-based precursor that meets or exceeds the general-purpose carbon fiber. For this study, isotropic coal-tar pitch precursor was used due to its ease in manufacturing carbon fiber and low-cost starting material. Various analyses such as elemental composition, softening point, TGA, FT-IR, NMR, single carbon fiber testing, and SEM were performed to fully characterize the precursor and carbon fiber. Using melt spinning method, the precursor was melt spun at 235 °C, a pressure of 1.5 MPa and a winding speed of 400 rpm to achieve continuous small diameter fibers known as spun/green fibers. The winding speed of the drum collector and the spinneret diameter controlled the overall diameter of the carbon fibers. The green fibers then underwent the thermal treatment processes of stabilization and carbonization. The green fibers were oxidized at 300 °C with a heating rate of 0.25 °C/min in air. Later, they were carbonized at 1100 °C with a heating rate of 1 °C/min in an inert environment. Experimentally it was determined that smaller diameter carbon fibers were easy to fully oxidize with a smaller heating rate. This also resulted in higher mechanical properties due to less defects in their structures. The isotropic pitch-based carbon fiber manufactured in this study have the maximum tensile strength and elastic modulus of 927 MPa and 86 GPa, respectively.
Author: Leighton H. Peebles
Publisher: CRC Press
ISBN: 1351078879
Category : Technology & Engineering
Languages : en
Pages : 218
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Book Description
Carbon Fibers presents an up-to-date review of the progress pertaining to the formation of carbon fibers from rayon, acrylic, and pitch precursors. The book emphasizes the preparation, characterization, and properties of commercial materials. It also considers the compressive properties of carbon fibers, the lack of correlation between surface characterization and fiber-matrix interactions, and the discrepancy between surface composition as determined by XPS and the reaction of surface groups with chemical reagents. Other topics discussed include:
Author: T.D. Burchell
Publisher: Elsevier
ISBN: 0080528546
Category : Science
Languages : en
Pages : 559
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Book Description
The inspiration for this book came from an American Carbon Society Workshop entitled "Carbon Materials for Advanced Technologies" which was hosted by the Oak Ridge National Laboratory in 1994. Chapter 1 contains a review of carbon materials, and emphasizes the structure and chemical bonding in the various forms of carbon, including the four allotropes diamond, graphite, carbynes, and the fullerenes. In addition, amorphous carbon and diamond films, carbon nanoparticles, and engineered carbons are discussed. The most recently discovered allotrope of carbon, i.e., the fullerenes, along with carbon nanotubes, are more fully discussed in Chapter 2, where their structure-property relations are reviewed in the context of advanced technologies for carbon based materials. The synthesis, structure, and properties of the fullerenes and nanotubes, and modification of the structure and properties through doping, are also reviewed. Potential applications of this new family of carbon materials are considered.The manufacture and applications of adsorbent carbon fibers are discussed in Chapter 3. The manufacture, structure and properties of high performance fibers are reviewed in Chapter 4, and the manufacture and properties of vapor grown fibers and their composites are reported in Chapter 5. The properties and applications of novel low density composites developed at Oak Ridge National Laboratory are reported in Chapter 6.Coal is an important source of energy and an abundant source of carbon. The production of engineering carbons and graphite from coal via a solvent extraction route is described in Chapter 7. Applications of activated carbons are discussed in Chapters 8-10, including their use in the automotive arena as evaporative loss emission traps (Chapter 8), and in vehicle natural gas storage tanks (Chapter 9). The application of activated carbons in adsorption heat pumps and refrigerators is discussed in Chapter 10. Chapter 11 reports the use of carbon materials in the fast growing consumer electronics application of lithium-ion batteries. The role of carbon materials in nuclear systems is discussed in Chapters 12 and 13, where fusion device and fission reactor applications, respectively, are reviewed. In Chapter 12 the major technological issues for the utilization of carbon as a plasma facing material are discussed in the context of current and future fusion tokamak devices.The essential design features of graphite moderated reactors, (including gas-, water- and molten salt-cooled systems) are reviewed in Chapter 13, and reactor environmental effects such as radiation damage and radiolytic corrosion are discussed. The fracture behaviour of graphite is discussed in qualitative and quantitative terms in Chapter 14. The applications of Linear Elastic Fracture Mechanics and Elastic-Plastic Fracture Mechanics to graphite are reviewed and a study of the role of small flaws in nuclear graphites is reported.
Author: Jean-Baptiste Donnet
Publisher: CRC Press
ISBN: 1482285398
Category : Technology & Engineering
Languages : en
Pages : 584
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Book Description
"Third Edition offers the latest information on the structural, surface, mechanical, electronic, thermal, and magnetic properties of carbon fibers as well as their manufacture and industrial applications from many of the world's most distinguished specialists in the field. "
Author: Intratec
Publisher: Intratec
ISBN:
Category : Business & Economics
Languages : en
Pages : 102
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Book Description
This report presents a cost analysis of Carbon Fiber production from pitch. The process starts with a preparation step that converts the pitch into mesophase pitch. The mesophase pitch is then stabilized and passes through carbonization, graphitization, surface treatment and sizing, before being wound. This report was developed based essentially on the following reference(s): (1) "Fibers, 5. Synthetic Inorganic", Ullmann's Encyclopedia of Industrial Chemistry, 7th edition (2) US Patent 4999099, issued to Conoco in 2011 (3) Chung, D.D.L., Carbon Fiber Composites, 1994 Keywords: Carbon Fiber, Petroleum Pitch, Coal Tar Pitch, Mesophase Pitch
