By John D. Buckley and Dan D. Edie (Auth.)
The foremost components of carbon-carbon fabrics and composites are defined during this complete quantity. It offers info and expertise at the fabrics and constructions built for the construction of carbon-carbon fabrics and composites. The textual content consists of papers via thirteen famous authors of their components of craftsmanship with regards to the procedures and construction of those fabric platforms and constructions.
The subject material within the e-book is prepared to steer the reader via fabrics processing, fabrication, structural research, and functions of usual carbon-carbon items. the data supplied contains: fiber expertise, matrix fabric, layout of composite constructions, production innovations, engineering mechanics, protecting coatings, and structural purposes utilizing carbon-carbon fabrics and composites
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Extra info for Carbon–Carbon Materials and Composites
Toray Company. Stirring not only changed the microstructure of the fibers, but also it modified their crystalline characteristics; an example of this is shown in table 2. Hamada used X-ray diffraction to compare the degree of 3-D order present in the various fibers. For fibers spun without stirring (radial), he found separation of the 100 and 101 peaks and the appearance of a clear 112 peak. Fibers spun with stirring showed no separation of the 100 and 101 peaks and a very weak 112 peak. 51 CC Materials and Composites Folded layer Flat layer (a) Thome I pitch-based carbon fiber.
43 CC Materials and Composites Similar to PAN and rayon, the melt-spun mesophase pitch fibers must be thermoset to render them infusible and then carbonized to develop their final properties. Because mesophase pitch fibers develop an extremely high degree of molecular orientation during fiber formation, the object of subsequent heat treatment is not to develop, but instead to preserve, the molecular orientation. Because of this, the conditions used in the thermosetting and carbonization steps are usually mild compared with those used for PAN and rayon precursor fibers.
This orientation perpendicular to the fiber axis usually is determined during the flow through the extrusion capillary. Nazem (ref. 21) demonstrated one method of creating a random orientation during fiber formation with mesophase. By extruding mesophase through a round extrusion capillary that had a small lengthto-diameter ratio and contained a porous media, he prevented a stable, parabolic flow profile from developing during extrusion. The resulting fiber had a totally random microstructure perpendicular to the fiber cross section.