Compressive residual thermal stress induced crack deflection in carbon nanotube-doped carbon/carbon composites

Sun, Jiajia; Li, Hejun; Han, Liyuan; Li, Yunyu; Lu, Yuanyuan; Song, Qiang

doi:10.1016/j.ceramint.2019.04.098

Cited by 10 publications

(6 citation statements)

References 31 publications

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“…The results partly validate the proposed model, and thus the baking process of anode blocks in CTABF could be further studied with this model. Besides, to obtain appropriate physical and chemical properties, the maximum baking temperature should be controlled within 1050 C to 1200 C. 16 It is seen that under the condition of the highest baking temperature being 1200 C, the baking time of the CTABF is shortened by 6 hours as compared to the traditional ABF. This is mainly because the special flue structure of CTABF enhances the heat exchange between the high-temperature flue gas and the crucibles as discussed below.…”

Section: Comparisons Of Modeling Results and In Situ Measurementmentioning

confidence: 99%

“…As the maximum temperature difference reaches 120 C, cracks are created inside the anode blocks due to the extremely high residual stresses. 16 The undesirable properties are also caused by the nonuniform heat flux. For example, low electrical resistivity, mechanical strength, and density are observed under the high-temperature gradient condition.…”

Section: Nonuniform Heat Flux Distribution Around the Anode Blocksmentioning

confidence: 99%

“…It is reported that the maximum temperature difference within the anodes in the same pit reaches 100°C based on their locations, 15 which leads to the overbaking or underbaking of the anode blocks. As the maximum temperature difference reaches 120°C, cracks are created inside the anode blocks due to the extremely high residual stresses 16 . The undesirable properties are also caused by the nonuniform heat flux.…”

Section: Introductionmentioning

confidence: 99%

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Structural and thermal analysis of an innovative baking furnace for carbon anode production

2020

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The urgent demands for the high efficiency and low consumption of carbon anode baking process stimulate the structure optimization of the baking furnace. In this paper, a closed-top innovative anode baking furnace (CTABF) with periodically arranged burners and anode crucibles is proposed, and the thermal process in the CTABF is studied via a coupled multi-physics model and the in situ measurement. Results show that the multi-channel design changes the one-way high-temperature flue gas path and increases its residence time in the furnace, while the temperature distributions in the inner and outer crucibles show good uniformity. The average convective heat flux accounts for about 68% of the total heat flux around the crucible surface, and thus the baking rate of anodes can be controlled by adjusting the power of driven fan. Therefore, due to the above structural retrofits, the baking time and energy consumption are reduced and the baking quality is improved, showing the superiority of the proposed CTABF over the traditional ABF.

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Section: Comparisons Of Modeling Results and In Situ Measurementmentioning

confidence: 99%

Section: Nonuniform Heat Flux Distribution Around the Anode Blocksmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Structural and thermal analysis of an innovative baking furnace for carbon anode production

2020

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“…They have also been used as secondary reinforcement in CCCs. Recently, several studies have been reported in the literature related to the fabrication of CNTs reinforced CCCs (CNT-CCCs) mainly focuses on the methods of CNTs incorporation, their effects on microstructures, density, tribological characteristics, compressive, flexural, and interlaminar shear strength of the CCCs 32–38. However, no study has been found related to the effect of CNTs on other important properties of the phenolic resin-based CCCs like tensile properties, viscoelastic properties, electrical conductivity, and thermal stability which are the crucial parameters for the evaluation of the performance of the composites used for high-performance structural applications.…”

Section: Introductionmentioning

confidence: 99%

Enhanced electrical, mechanical, and viscoelastic properties of carbon-carbon composites using carbon nanotubes coated carbon textile as reinforcement

Kumar

Kar

Dasgupta

2020

Journal of Composite Materials

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In this research work, Carbon-carbon composites (CCCs) were fabricated via carbonization of carbon nanotubes (CNTs)-coated carbon textile (CNT-CF) reinforced polymer matrix composites (PMCs) preforms at 600, 900, 1200, and 1500 °C in a tubular furnace. To obtain CNT-CF, MWCNTs were produced radially on the surface of the nano-nickel particles plated carbon textile at 700°C using catalytic chemical vapor deposition method and C2H2 gas as a carbon source. The effects of CNT coating on carbon textiles were evaluated using FESEM, HR-TEM, XRD, Raman, TGA, and BET analysis. The effects of heat treatment temperatures on CNTs coated and uncoated PMCs manufactured using simple hand-layup method subsequently hot compressing were evaluated through XRD, FESEM, density, electrical conductivity measurement, tensile and flexural test, and viscoelastic properties using DMTA. The CNT coated CCCs obtained at 1500°C exhibited ∼ 66, 62, 83, 27, 44, 30, and 36% enhancement in electrical conductivity, storage modulus, loss modulus, tensile strength, Young’s modulus, flexural strength, and flexural modulus of CNT coated CCCs, respectively compare to uncoated CCCs. Moreover, substantial enhancement in thermal stability of PMCs and CCCs make CNT-CF as one of the competent alternate reinforcement for the fabrication of structural parts used in high-performance applications.

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“…Ahmad et al 9 reported the addition of multiple‐walled carbon nanotubes (MWCNTs) in alumina ceramic could enhance the fracture toughness, attributing to its synergy effect of fiber pullout induced toughening and stretching/disentangling. Sun et al 10 used electrophoretic deposition method for the synthesis of carbon/carbon composites with CNTs, which showed improved strength and toughness. Sikora et al 11 found that the addition of MWCNT (0.125 wt%) had beneficial for the compressive strength improvement in cement samples, even subjected to high temperature (300‐600°C).…”

Section: Introductionmentioning

confidence: 99%

Synthesis and mechanical properties of lightweight hybrid geopolymer foams reinforced with carbon nanotubes

Yan

Zhang

et al. 2020

Int J Applied Ceramic Tech

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A lightweight hybrid geopolymer foams reinforced with carbon nanotubes (CNTs) was exploited by adding the CNTs into geopolymeric matrix through hydrogen peroxide method. The synergistic effects of nanotubes and foaming agent on the phase evolution, microstructure, and mechanical properties were investigated. After introduction of nanotubes, the geopolymer foams reinforced with CNTs (CNTs/KGP) still showed amorphous structure. Porosity of the foams increased with the H2O2 content and decreased with the increase in CNTs content. The addition of CNTs (1‐9 wt%) in foams refined the distribution of pore size from 523 to 352 μm. Compression strength of the CNTs/KGP samples elevated with the increasing content of CNTs, which was contributed to the crack propagation and bridging of CNTs in foams. The CNTs/KGP foams with considerable porosity show potential applications in adsorption, filtration, membrane supports, other industries, etc

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Compressive residual thermal stress induced crack deflection in carbon nanotube-doped carbon/carbon composites

Cited by 10 publications

References 31 publications

Structural and thermal analysis of an innovative baking furnace for carbon anode production

Structural and thermal analysis of an innovative baking furnace for carbon anode production

Enhanced electrical, mechanical, and viscoelastic properties of carbon-carbon composites using carbon nanotubes coated carbon textile as reinforcement

Synthesis and mechanical properties of lightweight hybrid geopolymer foams reinforced with carbon nanotubes

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