Tuning anisotropic thermal conductivity of unidirectional carbon/carbon composites by incorporating carbonaceous fillers

Yuan, Guanming; Li, You; Long, Xiangyi; Cui, Zhengwei; Zhang, Dong; Cong, Ye; Jiang, Zhang; Li, Xuanke

doi:10.1007/s10853-020-04357-4

Cited by 14 publications

(4 citation statements)

References 47 publications

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“…The enhanced interface makes the debonding of MP harder from the matrix. In the high-temperature static ablation test, the pitch carbon generated in situ will gradually transform into the ordered carbon structure with a high degree of graphitization and form a mosaic structure among the glassy carbon due to its characteristic plastic flow behavior . Therefore, the pitch carbons are the main energy-absorbing bodies that provide the MPBPR composites improved mechanical performance after carbonization.…”

Section: Results and Discussionmentioning

confidence: 99%

“…Also, the diameter of this sphereshaped structure in the char gradually grows with increasing content of MP. According to some previous studies, 47,50,51 it is expected that the liquid crystalline mesophase pitch undergoes a liquid-phase carbonization process in the ablation environment. As shown in Figure 6b,d, the typical lamellar structure with a highly preferred orientation of pitch-derived carbon is clearly seen, which is an intermediate state of the sphereshaped structure.…”

Section: Ablation Performancementioning

confidence: 95%

“…As reported by many research studies, liquid crystalline MP can in situ transform into highly oriented graphite microcrystals with high graphitization. 47,50,53 According to the results of SEM and PLM observations, the char layer of MPBPPR composites possesses a large number of graphitic structures in sphereshaped and anisotropic domains with large sizes. To verify whether the introduction of MP can promote the graphitization of the char layer, XRD and Raman analyses were employed by collecting the carbon residues on the ablated center that was in direct contact with the oxyacetylene flame, and the results are shown in Figure 9.…”

Section: Ablation Performancementioning

confidence: 99%

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Effect of Mesophase Pitch Incorporation on the Ablation Behavior and Mechanism of Phenolic Composites

Huang

Zhang

et al. 2022

Ind. Eng. Chem. Res.

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Phenolic resin plays a critical role in ablative thermal protection materials. However, its ablation and insulation properties need to be further improved to meet the growing requirements of the entire aerospace industry. In this work, composites are altered with various loadings of mesophase pitch (MP) to make mesophase pitch-modified boron-phenolic resin (BPR) composites (MPBPR). The compressive strengths of carbonized MPBPR composites are significantly improved (optimally by 2.7 times) via this modification, indicating the improved mechanical performance of MPBPR composites under high temperatures. Results reveal that the obtained MPBPR composites show better ablation resistance and thermal insulation performance under oxyacetylene flame. The linear ablation rates (4 MW/m2, lasting for 30 s) of the composites with 10 and 20 wt % MP are reduced by 41.5 and 55.4% compared to that of neat BPR. Meantime, MPBPR composites exhibit lower back-face temperature during the ablation process. Furthermore, results also show that the introduction of MP can effectively avoid the growth of large transversal microcracks, increase the proportion of micropores in the ablated char layer, and simultaneously improve the graphitization of resultant char. Both the microporous and graphitic structures of the residual char contribute to the improved ablation and insulation properties of MPBPR composites. The abovementioned results indicate that these MP-modified boron-phenolic resins are promising materials for application in a thermal protection system.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Ablation Performancementioning

confidence: 95%

Section: Ablation Performancementioning

confidence: 99%

See 1 more Smart Citation

Effect of Mesophase Pitch Incorporation on the Ablation Behavior and Mechanism of Phenolic Composites

Huang

Zhang

et al. 2022

Ind. Eng. Chem. Res.

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“…They compared the transversal section, the side plane, and the hot-pressed plane for the thermal diffusivity (D). The D values of the block transversal section dropped from 650 to 450 mm 2 with the increase in the MWCNTs, while the side plane and hot-pressed plane showed a value less than 25 mm 2 /s and peaked at 3 vol.% MWCNTs [125]. Ding et al reduced the excessive thermal residual stress of Mg-6Zn through hot-pressing with SiC-catalyzed MWCNT.…”

Section: Hot-press Sintering (Hps)mentioning

confidence: 99%

Recent Developments in Carbon Nanotubes-Reinforced Ceramic Matrix Composites: A Review on Dispersion and Densification Techniques

et al. 2021

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Ceramic matrix composites (CMCs) are well-established composites applied on commercial, laboratory, and even industrial scales, including pottery for decoration, glass–ceramics-based light-emitting diodes (LEDs), commercial cooking utensils, high-temperature laboratory instruments, industrial catalytic reactors, and engine turbine blades. Despite the extensive applications of CMCs, researchers had to deal with their brittleness, low electrical conductivity, and low thermal properties. The use of carbon nanotubes (CNTs) as reinforcement is an effective and efficient method to tailor the ceramic structure at the nanoscale, which provides considerable practicability in the fabrication of highly functional CMC materials. This article provides a comprehensive review of CNTs-reinforced CMC materials (CNTs-CMCs). We critically examined the notable challenges during the synthesis of CNTs-CMCs. Five CNT dispersion processes were elucidated with a comparative study of the established research for the homogeneity distribution in the CMCs and the enhanced properties. We also discussed the effect of densification techniques on the properties of CNTs-CMCs. Additionally, we synopsized the outstanding microstructural and functional properties of CNTs in the CNTs-CMCs, namely stimulated ceramic crystallization, high thermal conductivity, bandgap reduction, and improved mechanical toughness. We also addressed the fundamental insights for the future technological maturation and advancement of CNTs-CMCs.

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Fabrication of high thermal conductivity C/C composites reinforced by graphite films with hexagonal pits

Meng

Ma²,

Zhang³

et al. 2022

J Mater Sci

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Tuning anisotropic thermal conductivity of unidirectional carbon/carbon composites by incorporating carbonaceous fillers

Cited by 14 publications

References 47 publications

Effect of Mesophase Pitch Incorporation on the Ablation Behavior and Mechanism of Phenolic Composites

Effect of Mesophase Pitch Incorporation on the Ablation Behavior and Mechanism of Phenolic Composites

Recent Developments in Carbon Nanotubes-Reinforced Ceramic Matrix Composites: A Review on Dispersion and Densification Techniques

Fabrication of high thermal conductivity C/C composites reinforced by graphite films with hexagonal pits

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