Effects of air oxidation on mesophase pitch-based carbon/carbon composites

Li, Hailiang; Li, Hejun; Lu, Jinhua; Zhang, Xiang; Li, Kezhi

doi:10.1016/j.carbon.2010.12.009

Cited by 24 publications

(14 citation statements)

References 20 publications

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“…Following impregnation with pressurized mesophase pitch, the samples were exposed to an oxidizing atmosphere and then carbonized. The details of the impregnation and carbonization step are discussed in our previous work [17]. After four cycles of impregnation and carbonization, the samples were densified by CVI for 20 h in an electric resistance furnace to fill pores generated during the carbonization of mesophase pitch.…”

Section: Sample Preparationmentioning

confidence: 99%

Effects of a predeposited pyrocarbon layer on the microstructure and mechanical properties of carbon/carbon composites

et al. 2012

Materials Science and Engineering: A

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Section: Sample Preparationmentioning

confidence: 99%

Effects of a predeposited pyrocarbon layer on the microstructure and mechanical properties of carbon/carbon composites

et al. 2012

Materials Science and Engineering: A

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“…It is revealed that both flexural and compressive strengths of the compact YE-1 with higher OMG are greater than those of compact YE-0 with lower OMG. Li et al [18] reported significant improvement in mechanical properties with air oxidation of a carbon felt and cloth reinforced C/C composite. Although they reported the effect of air oxidation on mechanical properties, the influence of OMG was not reported.…”

Section: Effect Of Hot-pressing Pressure On Yield Yield Rate and Yimentioning

confidence: 99%

Yield enhancement of matrix precursor in short carbon fiber reinforced randomly oriented carbon/carbon composite

Raunija¹,

Verma²

2016

Carbon letters

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Isroaniso matrix precursor synthesized from commercially available petroleum pitch was stabilized in air. The influence of oxygen mass gain during stabilization on the yield of matrix precursor was studied. Additionally, the influence of pressure on the yield of the stabilized matrix precursor in a real system was studied. The fourier transform infrared spectrometry (FTIR), thermogravimetric analysis (TGA), yield, yield rate, and yield impact were used to check the effect of stabilization and pressure on the yield of the matrix precursor and the end properties of the composite thereafter. The results showed that the yield increased with stabilization duration up to 20 h whereas it decreased for stabilization duration beyond 20 h. Further results showed that the stabilized matrix precursor for a duration of 5 h could withstand almost two-fold greater hot-pressing pressure without resulting in exudation as compared to that of a 1 h stabilized matrix precursor. The enhanced hot-pressing pressure significantly improved the yield of the matrix precursor. As a consequence, the densification and mechanical properties were increased significantly. Further, the matrix precursor stabilized for a duration of 20 h or more failed to provide proper and uniform binding of the reinforcement.

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“…In this processes the important factors are the coke types and the mixing ratio of coke and binder, but at the same time, to obtain high density blocks of graphite, the steps of impregnation, drying and calcination need to be repeated, and this represents a critical problem because to repeat the impregnation and calcination processes can increase the manufacturing costs and time. In order to eliminate these deficiencies, many studies were achieved to investigate other advanced methods, such as using of mesophase powder (Li et al, 2011;Zhao et al, 2013;Cheng et al, 2015), mesoporous carbon microbeads (MCMB) (Fang et al, 2015;Shen et al, 2011), self-sintering coke (Kocaefe et al, 2016), or adding a sintering agent (Shen et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Obtaining of high density carbon materials by coke sintering resulting from heat treatment of tar for applications in sensors manufacture

Marinescu¹,

David²,

Ghiculescu³

2020

Proceedings of the 8th International Conference on Advanced Materials and Systems

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In this research, high-density and high-strength carbonized carbon blocks were manufactured by coke sintering resulted from heat treatments of biomass pyrolysis tar. First, the molecular weight distribution of the tar was controlled through a pressurized heat treatment at 365°C and then this heat-treated tar was treated using a delayed coking system to obtain the self-sintering coke. Finally, carbon blocks were molded from the self-sintering coke and carbonized at 1100°C for 2h. Through rapid decomposition of the high molecular weight compounds in the tar at 360°C, the molecular weight distribution of tar was confirmed to be controllable by this treatment stage. During carbonization was observed a swelling in carbon blocks manufactured that contain more than 15 wt% of volatile matter from 150-500°C. The optimum conditions of the two heat treatments stage were established to be 310°C for 3 h and 500°C for 1.5 h. The highest density and highest strength of the carbonized carbon blocks manufactured were 1.44 g/cm3 and 68.7 MPa, respectively.

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Effects of air oxidation on mesophase pitch-based carbon/carbon composites

Cited by 24 publications

References 20 publications

Effects of a predeposited pyrocarbon layer on the microstructure and mechanical properties of carbon/carbon composites

Effects of a predeposited pyrocarbon layer on the microstructure and mechanical properties of carbon/carbon composites

Yield enhancement of matrix precursor in short carbon fiber reinforced randomly oriented carbon/carbon composite

Obtaining of high density carbon materials by coke sintering resulting from heat treatment of tar for applications in sensors manufacture

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