Morphology influence of the oxidation kinetics of carbon nanofibers

Córdoba, J.M.; Tamayo-Ariztondo, J.; Molina-Aldareguia, J.M.; Elizalde, M.R.; Odén, Magnus

doi:10.1016/j.corsci.2009.01.029

Cited by 16 publications

(7 citation statements)

References 47 publications

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“…In general, the oxidation mechanism of CFs below 600°C is mainly controlled by chemical reaction, while the rate‐controlling mechanism undergoes a transition from chemical reaction to diffusion above 600°C, which can be influenced by oxygen partial pressure, crystalline parameters, impurities, and so on . As the oxygen partial pressure and crystalline parameters of all samples remain almost the same in our study, it is speculated that Al 2 O 3 particles are responsible for the changes in oxidation behavior of CF.…”

Section: Resultsmentioning

confidence: 52%

Effects of doping aluminum chloride on stabilization and properties of polyacrylonitrile‐based carbon fibers

Chen

Lü

Jiang

et al. 2018

J of Applied Polymer Sci

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Polyacrylonitrile (PAN) gel fibers were immersed in 0–2.0 wt % aluminum chloride (AlCl3) aqueous solutions to fabricate Al‐doped PAN fibers and the resultant carbon fibers (CFs) on a continuous production line, and the effects of doping with AlCl3 on the stabilization and properties of PAN‐based CFs were investigated. The Al content in the PAN fibers and in the resultant CFs is 2800 and 5700 ppm, respectively, at 2.0 wt % doping solution concentration. Al compound particles were speculated to exist in the pores of PAN fibers, and they show strong inhibiting effects on both cyclization and oxidation reactions. However, the disadvantages can be overcome by a longer stabilization period or a higher stabilization temperature to produce CFs that have comparable mechanical properties with 2.98–3.20 GPa tensile strength and 210–220 GPa Young's modulus. Thermogravimetric analysis in air shows the weight of CFs increases remarkably from 19.0% to 59.3% at 850°C for Al content 0–1900 ppm, while it gradually decreases over 1900–5700 ppm.

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Section: Resultsmentioning

confidence: 52%

Effects of doping aluminum chloride on stabilization and properties of polyacrylonitrile‐based carbon fibers

Chen

Lü

Jiang

et al. 2018

J of Applied Polymer Sci

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“…The morphology of the as received and heat treated CNF with and without Cu coatings have been reported elsewhere [14,22]. In general, Cu depositions onto heat treated CNF (HBHT, PLHT, and PLCr) results in a complete coverage of the fibres while as received fibres show some naked areas.…”

Section: Resultsmentioning

confidence: 99%

“…For instance, the HB fibres are more bent and entangled than PL fibres [22] resulting in a decrease in the net heat transport which could explain why the thermal diffusivity values of the PL composites are better. The dramatic effect of the high temperature heat treatment of the CNF is due to the graphitisation [14], which results in improved Cu deposition efficiency. Finally, it is also clear from the results that the introduction of a Cr interlayer between the Cu and the CNF has a beneficial effect on the thermal conductivity of the composite, at least in the samples processed by SPS.…”

Section: Resultsmentioning

confidence: 99%

“…Composite materials, especially metal matrix composites, have the potential to fulfill the requirements, because a careful control of the reinforcing filler to matrix ratio allows good adjustment of physical and mechanical properties [9]. In this context, carbon nanofibres (CNF) are currently being considered as a potential reinforcement for various composite materials due to their excellent mechanical, thermal, and electrical properties [10][11][12][13][14]. More specifically, CNF reinforced copper composites constitute an ideal candidate to work as an electrical contact material and/or substrate for semiconductor devices [15] due to their potentially high electrical and thermal conductivity, high wear resistance, low coefficient of thermal expansion, good machinability and low price.…”

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confidence: 99%

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Thermomechanical properties of copper–carbon nanofibre composites prepared by spark plasma sintering and hot pressing

Ullbrand

Córdoba

Tamayo-Ariztondo

et al. 2010

Composites Science and Technology

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Several types of carbon nanofibres (CNF) were coated with a uniform and dense copper layer by electroless copper deposition. The coated fibres were then sintered by two different methods, spark plasma sintering (SPS) and hot pressing (HP). The Cu coating thickness was varied so that different volume fraction of fibres was achieved in the produced composites. In some cases, the CNF were pre-coated with Cr for the improvement the Cu adhesion on CNF. The results show that the dispersion of the CNF into the Cu matrix is independent of the sintering method used. On the contrary, the dispersion is directly related to the efficiency of the Cu coating, which is tightly connected to the CNF type. Overall, strong variations of the thermal conductivity (TC) of the composites were observed (20-200 W/mK) as a function of CNF type, CNF volume fraction and Cr content, while the coefficient of thermal expansion (CTE) in all cases was found to be considerably lower than Cu (9.9-11.3 ppm/K). The results show a good potential for SPS to be used to process this type of materials, since the SPS samples show better properties than HP samples even though they have a higher porosity, in applications where moderate TC and low CTE are required.

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“…Three types of carbon nanofibres have been studied, with the following structures before the high temperature heat treatment: platelet, herringbone and longitudinal aligned structures. High temperature heat treatments of carbon nanofibres and carbon nanotubes result in structural changes both internally and at the surface [13][14][15][16][17][18]. For example, heat treating carbon nanofibres at temperatures above 2200 ºC results in a high degree of graphitization [16].…”

Section: Introductionmentioning

confidence: 99%

Effect of heat treatment of carbon nanofibres on electroless copper deposition

Tamayo-Ariztondo¹,

Córdoba²,

Odén³

et al. 2010

Composites Science and Technology

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Cu is a well known heat sink material due to its high thermal conductivity.However, its coefficient of thermal expansion (CTE) is high. One of the most promising solutions for reducing it is to reinforce copper with carbon nanofibres (CNF) because of their low CTE. To exploit the properties of the CNFs a good dispersion of the reinforcement within the matrix must be achieved. One of the processing methods used to obtain a homogeneous CNF distribution is coating the CNF with Cu using electrochemical deposition. In this paper, the effect of the carbon structure on electroless deposition technique is studied. Different CNF have been compared: herringbone (HB), platelet (PL) and longitudinally aligned (previously heat treated) (LAHT). Herringbone and Platelet CNF were heat treated at 2750ºC for 30' which resulted in a structure resembling graphite with loops at the fibre surface. These loops are responsible for an enhancement of the copper coating. It is shown that the Cu coverage in electroless deposition is high for the graphene plane and poor at the edges of the plane.

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Morphology influence of the oxidation kinetics of carbon nanofibers

Cited by 16 publications

References 47 publications

Effects of doping aluminum chloride on stabilization and properties of polyacrylonitrile‐based carbon fibers

Effects of doping aluminum chloride on stabilization and properties of polyacrylonitrile‐based carbon fibers

Thermomechanical properties of copper–carbon nanofibre composites prepared by spark plasma sintering and hot pressing

Effect of heat treatment of carbon nanofibres on electroless copper deposition

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