Microstructure and flexural properties of C/C-Cu composites strengthened with in-situ grown carbon nanotubes

Kou, Gang; Guo, Lingjun; Li, Zhaoqian; Peng, Jian; Tian, Jie; Huo, Caixia

doi:10.1016/j.jallcom.2016.10.151

Cited by 39 publications

(14 citation statements)

References 29 publications

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“…This research promotes a promising train of thought which introduces carbon nanotubes (CNTs) into C/C composites with a view to improving their mechanical properties [ 4 , 5 , 6 , 7 ]. Ergo, the fabricated C/C composites could have a lower density because of the hollow CNTs and achieve increased mechanical properties [ 8 , 9 , 10 ]. Moreover, the increased reinforcement and structure of CNTs could accelerate the densification process of fabricating C/C composites [ 11 , 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

“…However, the reported methods usually introduce ready-made CNTs into the carbon fiber preform first, rather than CNTs being grown in-situ on carbon fibers before the densification process [ 10 , 11 , 12 , 13 , 14 , 15 , 16 ]. The common practice was introducing already-made CNTs into carbon fiber preform before the densification process.…”

Section: Introductionmentioning

confidence: 99%

“…Here, we propose a novel method of realizing the growth of CNTs by densification, which results in the fabrication of CNT-reinforced C/C composites (CC/C composites for convenience). A catalyst must be dispersed (for the growth of CNTs) at one side of the 2D needle-punched carbon fiber preform, rather than into the preform [ 10 , 17 , 18 ]. Next, the growth of a nano-pyrocarbon matrix occurs after the epitaxial growth of CNTs under the process of strictly controlled temperature gradient.…”

Section: Introductionmentioning

confidence: 99%

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Epitaxial Grown Carbon Nanotubes Reinforced Pyrocarbon Matrix in C/C Composites with Improved Mechanical Properties

et al. 2021

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In order to achieve the highly efficient preparation of high-performance carbon/carbon (C/C) composites, epitaxial grown carbon nanotubes (CNTs) and a pyrocarbon matrix were simultaneously synthesized to fabricate CNT-reinforced C/C composites (CC/C composites). With precise control of the temperature gradient, CNTs and the pyrocarbon matrix could grow synchronously within a 2D needle-punched carbon fiber preform. Surprisingly, the CNTs remained intact within the pyrocarbon matrix at the nano-level, and the CNT-reinforced nano-pyrocarbon matrix was compact, with virtually no gaps and pores, which were tightly connected with the carbon fibers without cracks. Based on the results of Raman analysis, there is less residual stress in the CNT-reinforced pyrocarbon matrix and carbon fibers, and less of a mismatch between the coefficient and thermal expansion. Additionally, CC/C composites fabricated by this method could achieve a low density, open porosity with a large size, and improved mechanical properties. More importantly, our work provides a rational design strategy for the highly efficient preparation and structural design of high-performance CNT-einforced C/C composites.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Epitaxial Grown Carbon Nanotubes Reinforced Pyrocarbon Matrix in C/C Composites with Improved Mechanical Properties

et al. 2021

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“…Because of the poor wettability between graphite phase and copper phase [9] ,each phase of the composites can only be connected by mechanical bounding and physical bonding,resulting in the poor binding effect between the two phases and there are voids existing in the composites [10] ,which seriously affects the mechanical properties and wear-resisting property of the composites.To improve the bonding strength and enhance the properties of the composites,some measures such as the addition of alloying elements which are prone to form carbides [11] ,the addition of new carbon material reinforcing agents and the modi cation of the graphite surface have been taken [12] .Many scholars have improved the mechanical properties and friction properties of composites by adding appropriate new high-performance materials such as carbon nanotubes(CNTs) [13] ,carbon bers(CF) [1] and graphene [14,15] .However,the nanomaterials are prone to agglomeration due to the high surface activity [16] ,which limits the amount and application elds of nano-materials.Metal coating on the surface of carbon material is a feasible method to improve the bonding strength [17] .Numerous studies show that the copper,nickel [18] and silver coating on the surface of carbon materials can availably improve the bonding strength between the strengthened graphite and metal phases.After a lot of research and exploration,the technology of preparing metalcoated graphite has become mature,the preparation cost of the composites have also been reduced,which can be effectively applied in industrial preparation.Wear resistance is an important property that affects the use of G/Cu composite materials [19] .A large number of scholars have studied the friction and wear performance of C/Cu composites and the reinforcement materials in different conditions from macro perspective [20,21] ,the friction mechanisms are derived by observing the friction coe cient,wear rate and SEM diagrams [22] .But few studies have observed the morphology,structure and crystal changes before and after the friction experiment from the micro perspective.…”

Section: Introductionmentioning

confidence: 99%

The Micro-Tribological Behavior and Friction Mechanism of the Graphite/Cu Composites and Copper-coated Graphite-graphite/Cu Composites

Zhu

Zhang

et al. 2021

Preprint

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The ring-block tribological behavior of the graphite/Cu(G/Cu) composites and copper-coated graphite-graphite/Cu(CCG-G/Cu) were studied by observing the friction coefficient,wear rate,microstructure and morphogoly of the composites after friction experiments.SEM and TEM were used to character the micro-morphology and micro-structure of debris,friction surface and friction cross section of the composites.The results show that adding 20wt% copper-coated graphite could reduced the friction coefficient and wear rate of the composites.The micro-morphology and micro-structure show that the copper phase are undergo oxidation and plastic deformation under cyclic stress,results in abundant deformation area in copper-rich zones.Interlaminar shedding and intramolecular tearing occurs in graphite phase,and then laid flat on the friction surface,forming a friction film with higher integrity and reducing the friction coefficient of the composites.The TEM images of the friction cross section show that deformation zone is mainly composed of accumulation zone,drag zone and carbon film.The simulation of the friction process shows that the initial stage is mainly dominated by abrasive wear and adhesive wear.With the progress of the experiment,the exposed copper phase is oxidized and oxidative wear occurs,graphite is shed and transferred to the contact surface.In the later stage of the experiment,a complete friction film with high graphite content is formed on the contact surface,which is mainly dominated by fatigue wear.

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“…1 To further improve the properties and reduce the cost, ceramics, MAX phases and alloys were introduced into the C/C composites. Ultra-high temperature ceramics, 2-4 SiC 5,6 and Cu 7,8 were extensively used to enhance the oxidation and ablation resistance, while Fe 9 and Cu 10,11 mixed Si powder were melt infiltrated into porous C/ C skeletons to modify the wear characteristics. MAX phases presented effectiveness in both ablation and wear improvement.…”

Section: Introductionmentioning

confidence: 99%

Effect of infiltrated eutectic AlSi on the microstructure and properties of C/C composites

Liu

Guo

Yao

et al. 2020

Journal of Composite Materials

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Eutectic AlSi alloy was pressure infiltrated into a porous C/C skeleton to develop a low cost new C/C composite for application without extreme high temperature. C/C composite possessed a density of 1.7 g/cm3 was prepared for comparison. The effects of filling AlSi with and without Al-Ti-C grain refiner on the microstructure and properties of C/C composites were mainly studied. Result indicated that the introduced AlSi interpenetrated with C/C skeleton and made the composites compact. In comparison with C/C composite, the compressive strength and particle erosion resistance were greatly enhanced while the density and thermal expansion coefficient (CTE) increased slightly. After adding the refiner, Si network involved dendritic Al in C/C-AlSi was transformed to refined mixed AlSi, Al bulk and Si surrounded dendritic Al, and two kinds of micro-cracks came into being, which resulted in the decreased strength, improved erosion property and increased CTE of C/C-AlSiR. Both AlSi textures and micro-cracks in the modified C/C composites determined the crack propagation and led to their different compressive behaviors and anti-erosion abilities.

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Microstructure and flexural properties of C/C-Cu composites strengthened with in-situ grown carbon nanotubes

Cited by 39 publications

References 29 publications

Epitaxial Grown Carbon Nanotubes Reinforced Pyrocarbon Matrix in C/C Composites with Improved Mechanical Properties

Epitaxial Grown Carbon Nanotubes Reinforced Pyrocarbon Matrix in C/C Composites with Improved Mechanical Properties

The Micro-Tribological Behavior and Friction Mechanism of the Graphite/Cu Composites and Copper-coated Graphite-graphite/Cu Composites

Effect of infiltrated eutectic AlSi on the microstructure and properties of C/C composites

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