Contribution of oxidation to the wear of carbon-carbon composites

Chang, H.W.; Rusnak, R. M.

doi:10.1016/0008-6223(78)90070-2

Cited by 30 publications

(8 citation statements)

References 5 publications

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“…The latter wear process is corroborated by the observation that the wear rate in diamond decreases with decreasing atmospheric pressure [21]. We here propose that similar processes are responsible for the weight loss observed during wear of other carbonaceous materials, such as the carbon-composite break pads discussed above [12], and provide some atomistic evidence for this hypothesis.…”

Section: Introductionsupporting

confidence: 57%

“…In the context of carbon materials, oxidation has been found to influence the wear rate of polycrystalline diamond films, which is probably related to a corrosion of grain-boundaries by removal of metallic binders [11]. For carbon composites as used in break pads, weight loss of the composite during wear is accompanied by a high friction coefficient and has been attributed to CO and CO 2 formation, which amounts to more than 60% of the total weight loss [12]. Indeed, the formation of CO 2 can be directly correlated with the onset of high friction coefficients [13] and proceeds at temperatures as low as 150°C [14].…”

Section: Introductionmentioning

confidence: 98%

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Formation and Oxidation of Linear Carbon Chains and Their Role in the Wear of Carbon Materials

et al. 2011

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The atomic-scale processes taking place during the sliding of diamond and diamond-like carbon surfaces are investigated using classical molecular dynamics simulations. During the initial sliding stage, diamond surfaces undergo an amorphization process, while an sp 3 to sp 2 conversion takes place in tetrahedral amorphous carbon (ta-C) and amorphous hydrocarbon (a-C:H) surface layers. Upon separation of the sliding samples, the interface fails. A rather smooth failure occurs for a-C:H, where the hydrogen atoms present in the bulk passivate the chemically active carbon dangling bonds. Conversely, sp-hybridized carbon chains are observed to form on diamond and ta-C surfaces. These carbynoid structures are known to undergo a fast degradation process when in contact with oxygen. Using quantum-accurate density functional theory simulations, we present a possible mechanism for the oxygen-induced degradation of the carbon chains, leading to oxidative wear of the sp phase on diamond and ta-C surfaces upon exposure to air. Oxygen molecules chemisorb on C-C bonds of the chains, triggering the cleavage of the chains through concerted O-O and C-C bond-breaking reactions. A similar reaction caused by adsorption of water molecules on the carbon chains is ruled out on energetic grounds. Further O 2 adsorption causes the progressive shortening of the resulting, O-terminated, chain fragments through the same O-O and C-C bond breaking mechanism accompanied by the formation of CO 2 molecules.

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Section: Introductionsupporting

confidence: 57%

Section: Introductionmentioning

confidence: 98%

Formation and Oxidation of Linear Carbon Chains and Their Role in the Wear of Carbon Materials

et al. 2011

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“…Research on the tribology of carbon/carbon composites can be generally divided into the following three categories: (1) effects of process parameters (such as different additives [4][5][6][7][8][9], manufacturing processes [10][11][12][13][14][15], processing temperatures [16][17][18][19], and carbon fiber types [20,21], etc. ), wear parameters [17,[22][23][24][25][26][27], and environmental factors [28][29][30][31] on the tribological behavior; (2) observation of the microstructure of worn surfaces and debris [32][33][34][35][36][37][38][39]; and (3) investigation of the basic friction, wear behavior, and wear mechanism [7,[40][41][42]. The author's earlier studies [13][14][15] were to investigate the effects of densification parameters such as the impregnating precursors, impregnation method, densification cycles, carbonization temperature, and rapid carbonization on the tribological behaviors of C/C ...…”

Section: Introductionmentioning

confidence: 99%

Doping Effects of Carbon Nanotubes and Graphene on the Flexural Properties and Tribological Performance of Needle-Punched Carbon/Carbon Composites Prepared by Liquid-Phase Impregnation

Lee,

Shih

et al. 2023

Nanomaterials

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The main goal of this study is to investigate the doping effects of carbon nanotubes (CNTs) and graphene on the needle-punched carbon/carbon (C/C) composites that are prepared by liquid-phase impregnation. In order to achieve, for the C/C composites, the purposes of high flexural strength, stable friction coefficient, low weight loss, and high thermal conductivity, our primary concern is to examine the flexural properties and the tribological performance, and then to explore a little further into the influence on thermal conductivity. In this study, carbon fiber preforms were first fabricated by needle-punched carbon-fiber cloth, and then liquid-phase phenolic resin, doped with different proportions of carbon nanotubes and graphene, was used as the impregnation solution to carry out multiple densification (impregnation–carbonization) cycles and fabricate various C/C composites. The main purpose was to probe into the doping effects of the CNTs and graphene, added to the impregnation solution, on the properties of C/C composites. The experimental results show that the addition of CNTs and graphene can improve the heat conductivity, flexural properties, and tribological performance of C/C composites, and the impact on these properties is more significant with the addition. Furthermore, the properties of graphene-doped C/C specimens are better than those of CNT-doped C/C specimens.

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“…High performance carbon/carbon (C/C) composites possess many merits such as light weight, high specific strength, good friction and wear properties, high toughness and thermal stability, which make them irreplaceable for applications in aeronautics industries and aerospace places. Oxidation of the C/C composites under oxygen containing conditions >400°C will result in the degradation of their strength which is extremely crucial for the applications at high temperatures 1–3. Recently, multilayer and functionally gradient ceramic coatings have been intensively developed by many methods including pack cementation,4–6 in situ formation process,7 plasma spray,8,9 sol–gel,10 chemical vapour deposition,11 etc.…”

Section: Introductionmentioning

confidence: 99%

Influence of temperature on phase, microstructure and oxidation resistance of carbon/carbon composites modified by hydrothermal treatment

Huang

Wang

Cao

et al. 2011

Surface Engineering

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Carbon/carbon (C/C) composites were modified by a hydrothermal treatment using phosphoric acid solution, B 4 C, SiC and Al 2 O 3 powders as infiltration fillers. The influence of the hydrothermal treatment temperature on the phase, microstructure and anti-oxidation property of the as modified composites was investigated. The phase composition and microstructure of the modified composites before and after oxidation were characterised by X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy techniques. Results show that the oxidation resistance of the C/C composites is effectively improved after modified by the hydrothermal treatment. The mass loss of the C/C composites modified at different hydrothermal temperatures increases parabolicly with increased oxidation time, while the relationship between hydrothermal temperature and mass loss of the modified C/C composites after oxidation at 700uC for 10 h reveals a linear dependence. The mass loss of the modified C/C composites is only 3?69610 23 g cm 22 , which is much lower than 141?55610 23 g cm 22 of the non-modified C/C composites, after oxidised at 700uC in air for 10 h.

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Contribution of oxidation to the wear of carbon-carbon composites

Cited by 30 publications

References 5 publications

Formation and Oxidation of Linear Carbon Chains and Their Role in the Wear of Carbon Materials

Formation and Oxidation of Linear Carbon Chains and Their Role in the Wear of Carbon Materials

Doping Effects of Carbon Nanotubes and Graphene on the Flexural Properties and Tribological Performance of Needle-Punched Carbon/Carbon Composites Prepared by Liquid-Phase Impregnation

Influence of temperature on phase, microstructure and oxidation resistance of carbon/carbon composites modified by hydrothermal treatment

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