Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 38 for “"carbon composites"”.
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Micro-Architected Carbon Composites
… produced in a custom polymer and pyrolyzed into carbon lattices. Two different methods of infiltrating an epoxy matrix into these micro-lattices were tested, reaching fill percentages of ~96% and ~99%. Micro-architected carbon composites were created using the superior infiltration method, and …
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Oxidized mesoporous ZrO2/carbon composites for arsenic removal
… and characterization of oxidized mesoporous ZrO2/Carbon composites, determining the best air oxidation time, and comparing the adsorption performances of arsenate on oxidized mesoporous ZrO2/Carbon composites and unoxidized composites. The mesoporous ZrO2/Carbon composites were synthesized via a …
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Thermal stresses in coatings on carbon-carbon composites
… stresses in oxidation protection coatings on carbon-carbon composites. Multilayer coatings with each layer of coating applied at a different temperature, and gradient coatings with continuously varying properties through the thickness of the coating were considered. Particular emphasis was on …
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Micromechanics of crenulated fibers in carbon/carbon composites
… transverse strain and to a temperature change in carbon/carbon composites is examined using the finite element method. Stresses at the interface of both fully bonded and fully disbonded fibers having two crenulation amplitudes and with two fiber volume fractions are presented. In each case, these …
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Multiscale Numerical Modeling and Characterization of Carbon/Carbon Composites
<p>Carbon/carbon composite is a high-performance material with a unique set of physical and thermo-mechanical properties making it irreplaceable for severe environment aerospace applications. Its complex hierarchical microstructure presents materials scientists and engineers with substantial …
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The mechanical properties of tightly woven carbon-carbon composites
<p>The mechanical properties of a tightly woven carbon- carbon composite were investigated. The flexural strength and fracture toughness of these composites were measured as a function of temperature and atmosphere. The average flexural strengths are 147.1 ± 6.4 MPa in air and 144.0 ± 5.9 MPa in …
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Local and Global Sensitivity Analysis of Thin Ply Laminated Carbon Composites
… has been a great deal of interest in laminated composites constructed from very thin plies. This work studies the impact of manufacturing tolerances on ply orientation on the mechanical properties of the constructed laminate. Direct Monte Carlo simulation is used to model the variance introduced …
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Reaction sintered silicon nitride as a coating for carbon-carbon composites
… studied as a substitute coating material on the carbon-carbon material (RCC) presently used as a heat shield on the space shuttle, and on advanced carbon-carbon (ACC), a later development. On RCC, RSSN showed potential in a 538°C (1000°F) screening test in which silicon carbide coated material …
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Atomic Oxygen Effects on Particulate Contamination and Short Beam Strength of Carbon Composites
… material over time, particularly polymers. Carbon fiber/epoxy composites are a commonly used spacecraft material affected by AO exposure. Carbon composites are used as a structural material, such as on solar panels; their large surface area therefore is a potential contamination source to …
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PROTECTION OPTIMIZATION OF CARBON-CARBON COMPOSITES AGAINST AIR OXIDATION BY COATING WITH ANTI-OXIDANTS
… OF TITLE: (OPTIMIZATION PROTECTION OF CARBOB-CARBON COMPOSITES DISC-BRAKES MATERIAL BY COATING WITH ANTI-OXIDANTS) Developing glass enhancer mixture solutions (Ki’s), which promote the formation of a stable glass layer, homogenous clear liquid solution, and low viscosity liquid form, are easy …
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Fabrication and Characterization of Aluminum Nano-Carbon Composites and Investigation of Their Electrical Conductivity
Incorporating nano-carbon phases into metal-matrix composites is a promising strategy for simultaneously enhancing electrical conductivity and mechanical properties of metals. Here, we describe the manufacture of novel nano-carbon-aluminum composites by an electro-charge-assisted process (EAP) that …
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INTELLIGENT NON-DESTRUCTIVE EVALUATION EXPERT SYSTEM FOR CARBON-CARBON COMPOSITES USING THERMOGRAPHY, ULTRASONICS, AND COMPUTED TOMOGRAPHY
… evaluation (NDE) expert system for carbon-carbon (C/C) composites based on thermography, ultrasonic, computed tomography and post processing by means of fuzzy expert system technique. Data features and NDE expert knowledge are seamlessly combined in the intelligent system to provide …
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The modification of activated carbon cloth by alumina deposition
The impregnation of mesoporous carbon cloth with alumina has been studied. The most successful method of impregnation resulted from preparation of the alumina phase by a sol/gel route. This method involves a boehmite intermediate, and the heating environment for the thermal transition of boehmite …
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Mechanical and Thermal Characterization of Continuous Fiber-Reinforced Pyrolysis-Derived Carbon-Matrix Composites
… of high-temperature polymer-reinforced composites defer to conventionally expensive and intensive methods in both material and manufacturing aspects. Even traditional carbon-carbon, aerogel, and ceramic approaches are highly limited by difficult manufacturing techniques and are subject …
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Intelligent Non-destructive Measurement and Evaluation Techniques for Aircraft Composites
… the non-destructive evaluation (NDE) of aircraft carbon composites. The outcome of this research work developed reliable and faster techniques to aid in the rapid assessment of defects in anisotropic carbon composites by applying ultrasonic and infrared thermography NDE methods. To fulfill the …
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Supercapacitor electrode materials based on nanostructured conducting polymers and metal oxides
… polypyrrole nanowires, manganese oxide and its carbon composites, ruthenium oxide and its carbon composites being the products. A set of structural and chemical parameters influencing the performance of synthesized electrode materials were identified. Parameters included crystallinity, particle …
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Friction Characteristic Prediction within a Carbon-Carbon Race Clutch
… the effectiveness of clutches, the properties of carbon fibre reinforced carbon (known as carbon-carbon) composites are considered to be superior to any other candidate materials available. The cost of devices made from such materials has precluded their use in “everyday” applications and limited …
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