Effect of preform density on densification rate and mechanical properties of carbon/carbon composites

Hu, Yujie; Luo, Ruiying; Zhang, Yunfeng; Zhang, Jincao; Li, Jinsong

doi:10.1016/j.msea.2009.09.033

Cited by 13 publications

(7 citation statements)

References 21 publications

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“…As discussed previously, the pitches are apparently more effective owing to closure of the voids. The graphitic structure between the fibers and the matrix resins is good, and the carbon fiber surface is oriented satisfactorily [8,9,27,28].…”

Section: Effect Of Mesophase Binder Pitches On C/c Compositesmentioning

confidence: 98%

“…Densification has a direct impact on processing cost. Several studies have been conducted with the goal of fabricating C/C composites via a single manufacturing process [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…The coke yield depends on the pyrolysis conditions and pitch composition. Owing to the pitch plasticity and the devolatilization during the early carbonization stages, as well as further coke shrinkage during pyrolysis, many voids and cracks are observed in the C/C composites after the first impregnation and carbonization cycle [2,[8][9][10]. In addition, any pores can be produced inside the C/C composites after carbonization because the raw or binder pitches have a carbon yield of less than 50%, and it is thus necessary to repeat the impregnation and carbonization processes several times to manufacture the C/C composites for high density.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

One-Step Densification of Carbon/Carbon Composites Impregnated with Pyrolysis Fuel Oil-Derived Mesophase Binder Pitches

Yang

Park

Kuk

et al. 2020

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Carbon/carbon (C/C) composites are conventionally manufactured by liquid-phase impregnation (LPI), in which the binder pitches and phenolic resins are impregnated into the composites, and by chemical vapor infiltration (CVI). However, CVI has certain limitations in that expensive gases, such as methane and propane, are used and a long reaction time is required. Therefore, LPI is more widely used, as it employs economical pitches. In this study, the effects of one-step preparation on mechanical properties of C/C composites impregnated with mesophase binder pitches and phenolic resins have been investigated. The C/C composites containing four types of 20 wt.% mesophase binder pitches had differences in softening point (SP) and quinoline insoluble (QI) contents. After conducting trials on mesophase formation using different heat treatment temperatures and times, the best density and mechanical properties of the C/C composites were achieved using the mesophase binder pitches with 170 °C SP. However, when SP 200 °C was used, the density of the C/C composites was not further improved. This is because the binder pitches were not properly impregnated into the composites due to the high viscosity and QI of the binder pitches. Furthermore, the C/C composites fabricated with 20 wt.% pitch 2 exhibited the highest mechanical properties.

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Section: Effect Of Mesophase Binder Pitches On C/c Compositesmentioning

confidence: 98%

“…Densification has a direct impact on processing cost. Several studies have been conducted with the goal of fabricating C/C composites via a single manufacturing process [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

One-Step Densification of Carbon/Carbon Composites Impregnated with Pyrolysis Fuel Oil-Derived Mesophase Binder Pitches

Yang

Park

Kuk

et al. 2020

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show abstract

“…Therefore, it seems that not all of C-F bonds react with HO-C to form C-O-C and part of C-F bonds react to form C-O-C bonds in the interfacial area, maximizing the mechanical properties of the C/C composites. It is also important that too strong interfacial adhesion impairs the mechanical properties of composites, due to damage incurred during carbonization [7][8][9][10]. However, oxyfluorination of the carbon preform resulted in hard chemical bonds and soft electrophilic bonds, thus achieving improved flexural strength.…”

Section: Mechanical Properties Of the Prepared C/c Compositesmentioning

confidence: 99%

“…Various studies have reported that acid treatment of carbon fibers increases the interfacial adhesion of C/C composites, but the mechanical properties of these composites deteriorate, due to the bonds being too strong in the fiber-matrix (F-M) interface [7][8][9][10]. Considering the disadvantages of conventional fiber surface treatment, direct fluorination appears to be a good alternative for improving F-M interfacial adhesion.…”

Section: Introductionmentioning

confidence: 99%

Synergistic effects induced by oxy-fluorination of carbon preforms to improve the mechanical and thermal properties of carbon–carbon composites

Jeong¹,

Kim²,

Cho³

et al. 2011

Journal of Fluorine Chemistry

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2017

Carbon Composites

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Effect of preform density on densification rate and mechanical properties of carbon/carbon composites

Cited by 13 publications

References 21 publications

One-Step Densification of Carbon/Carbon Composites Impregnated with Pyrolysis Fuel Oil-Derived Mesophase Binder Pitches

One-Step Densification of Carbon/Carbon Composites Impregnated with Pyrolysis Fuel Oil-Derived Mesophase Binder Pitches

Synergistic effects induced by oxy-fluorination of carbon preforms to improve the mechanical and thermal properties of carbon–carbon composites

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