On the reactivity, structure, and porosity of carbon fibers and fabrics

Characterization and Oxidation Behavior of Rayon-Derived Carbon Fibers

“…6. This is the type of Arrhenius behavior is expected for carbon and carbon fibers [7][8][9][10]14]. The kinetics at low temperatures (T \ 800°C) show a strong temperature dependence, whereas the kinetics at high temperatures (T [ 800°C) show a weak temperature dependence.…”

“…This is characterized by a weak temperature dependence and uniform attack of the carbon. This transition from reaction-control to diffusion-control is a critical feature of carbon oxidation and has been discussed by a number of investigators [7][8][9][10]. However it has not been measured under laboratory conditions for the rayon-derived fibers in RCC.…”

“…Ismail [10] has studied the structure and oxidation properties of carbonized rayon-derived fibers, pitch based fibers, and PAN fibers. The carbonized rayonderived fibers had the highest porosity.…”

“…The oxidation of carbon in various forms has been extensively studied [7][8][9][10][11][12][13][14]. In general oxidation of carbon occurs in the following steps:…”

Modeling the Environmental Effects on Carbon Fibers in a Ceramic Matrix at Oxidizing Conditions

“…The reaction rate constant depends on such factors as the activation energy, impurity level, surface porosity, and crystal structure of the carbon as well as temperature [2,3]. The diffusion coefficient depends on such factors as total pressure, molecular weight, force constant and collision diameter for the product and reactant gases, and temperature [4].…”