Study of Different Types of Carbon Fiber Oxidation Kinetics

Govorov, Alexander; Галигузов, А. А.; Тихонов, Н. А.; Малахо, А. П.; Rogozin, A. D.

doi:10.1007/s11148-016-9897-6

Cited by 6 publications

(3 citation statements)

References 8 publications

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“…[46] and Govorov et al [47] are selected for comparison because they were carried out on T300 and PANex35 ex-PAN fibers respectively, carbonized at a temperature similar to that of the fibers of this study, and oxidized in TGA devices under pure oxygen. Empty star symbols on Fig.…”

Section: Comparison Of the Identified Oxidation Kinetics To Previous ...mentioning

confidence: 99%

Designing porous C/C composites for oxidation resistance with an analytical model based on the kinetic and architectural features of fibers and matrix

Fradin,

Couégnat,

Rebillat

et al. 2023

Composites Part B: Engineering

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Section: Comparison Of the Identified Oxidation Kinetics To Previous ...mentioning

confidence: 99%

Designing porous C/C composites for oxidation resistance with an analytical model based on the kinetic and architectural features of fibers and matrix

Fradin,

Couégnat,

Rebillat

et al. 2023

Composites Part B: Engineering

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“…Therefore, set up true mechanism CCCM heterogeneous oxidation, the staging, nature of the ongoing processes, and their mutual influence is really a difficulty. For example, the kinetics of the carbon materials oxidation at various conditions has been studied in detail for CF of varying degrees of graphitization (Govorov et al, 2015), graphite (Rosner and Allendorf, 1965), C/SiC composites, and PC (Halbig, 2004). The rate constants, activation energy values, and the order of reactions are established.…”

Section: Introductionmentioning

confidence: 99%

CCCM Specific Surface Estimation in Process of Low-Temperature Oxidation

Pogodin¹,

Астапов²,

Rabinskiy³

2020

PTQ

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The low-temperature oxidation process of carbon-carbon composite materials (CCCM) with a pyrocarbon matrix has been examined. Oxidation at temperatures of 450 to 700 °C is characterized by internal burnout of the carbon phase without a noticeable change in the experimental samples external volume. Oxidation resistance analysis of CCCM structural components was performed. CCCM and carbon fibers specific surface area were estimated by the low-temperature adsorption of nitrogen and krypton using the Brunauer-Emmett-Teller model and the theory of density functional model. Pore size distribution was calculated by the semi-empirical Horvath-Kawazoe method. A significant increase (about 10-15 times) in specific surface area of the composite material, together with a rise in free volume ~5%, was accompanied by total weight loss of about 5%. Specific surface area changes occur as a result of anisotropic etching of carbon fibers surface with the formation of micropores with 0.5–2.0 nm diameter range. Although macropores are formed mainly due to the oxidation of thermosetting binder pyrolysis residue, they do not contribute to the specific surface increase but solely provide access to micropores. Microporosity evolution leads to an increase of structural discontinuity degree and, ultimately, to the loss of matrix-filler contact boundary. As a result, an overall weakening of material mechanical characteristics is to be noted. Thus, oxidative degradation is closely related to the increase in void space. A follow-up study is on-going. In fact, an open question remains, namely whether the oxidative process occurs differently in the micropores of diameter less than 2 nm and how it may contribute to the oxidative stress resistance behavior of CCCM.

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“…Fiber gasification is influenced by several factors, namely the composition of the atmosphere, temperature, and pressure. 11,13,[26][27][28][29] For instance, with molecular oxygen (O 2 ), oxidation takes place by O 2 chemisorption and subsequent carbon monoxide and dioxide (CO/CO 2 ) desorption. Other mechanisms can come into play in the absence of O 2 , such as the Boudouard reaction in the presence of CO 2.…”

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confidence: 99%

Carbon fiber damage evolution under flame attack and the role of impurities

et al. 2022

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Carbon fibers (CFs) are prone to extensive oxidation under fire attack, for instance, in an aircraft fire scenario. This work addresses the damage mechanisms observed on polyacrylonitrile (PAN)-based CFs with different microstructure exposed to open flames. A fixed-point technique was developed to follow-up individual CFs by means of time-controlled insertion into premixed methane/air flames, followed by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) analyses.Besides diameter reduction, three localized damage mechanisms were discerned in the presence of impurities, which were quantified by neutron activation analysis (NAA). Severe pitting was ascribed to catalytic oxidation mainly caused by alkali and alkaline earth metals. After an initial period where catalytic reactions between impurities and the carbon surface dominate, the flame stoichiometry governed the CF gasification process, with lean flames being much more aggressive than rich ones.A second mechanism, channeling, was caused by mobile metallic impurities. Some impurities showed an opposite effect, lowering reactivity and thus preventing further catalysis. Amorphous damage with a skin-peeling effect is believed to be the result of localized impurities at high concentrations and microstructural variations. Hindrance or synergistic effects between impurities are discussed. Finally, apparent axial pit growth rates were determined and compared with other carbonaceous materials, revealing a strong influence of impurities and the flame reactive atmosphere on CF oxidation.

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Study of Different Types of Carbon Fiber Oxidation Kinetics

Cited by 6 publications

References 8 publications

Designing porous C/C composites for oxidation resistance with an analytical model based on the kinetic and architectural features of fibers and matrix

Designing porous C/C composites for oxidation resistance with an analytical model based on the kinetic and architectural features of fibers and matrix

CCCM Specific Surface Estimation in Process of Low-Temperature Oxidation

Carbon fiber damage evolution under flame attack and the role of impurities

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