Pressure-Strengthened Carbon Fibers from Mesophase Pitch Carbonization Processes

Wei, Yanzhuo; Chen, Jincong; Zhao, Haiyan; Zang, Xining

doi:10.1021/acs.jpclett.2c00664

Cited by 12 publications

(5 citation statements)

References 22 publications

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“…The greater the graphitization degree, the less the crystal defects, and the stronger the oxidation resistance. Many studies have shown that MP can be transformed into carbon materials with high orientation and high graphitization degree in situ during carbonization, and is an ideal precursor of high‐performance carbon materials 38,39 . In order to verify whether the introduction of MP can improve the graphitization degree of the char layer, the central char layer after the ablation of the BPR and MP‐modified composites was analyzed by XRD.…”

Section: Resultsmentioning

confidence: 99%

“…Many studies have shown that MP can be transformed into carbon materials with high orientation and high graphitization degree in situ during carbonization, and is an ideal precursor of high-performance carbon materials. 38,39 In order to verify whether the introduction of MP can improve the graphitization degree of the char layer, the central char layer after the ablation of the BPR and MP-modified composites was analyzed by XRD. Figure 8 shows the XRD spectrum of the whole char layer powder after the ablation of the BPR and MP modified composites and the d 002 and L c values calculated from the graphite (002) peak in the spectrum.…”

Section: Characteristics and Ablation Properties Of Fiber-reinforced ...mentioning

confidence: 99%

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Enhanced ablation resistance of carbon/phenolic composites based on mesophase pitch reinforced particles

Yue,

Huang,

Zou

et al. 2023

J of Applied Polymer Sci

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Phenolic resin (PR)‐based composites are the main materials used in thermal protection system (TPS) at present. However, the low graphitization degree of the char layer formed by PR easily leads to cracks and other defects. In this study, carbon/phenolic composites were modified by mesophase pitch (MP) to improve the structural strength, fracture toughness and crack propagation resistance. The ablation rate was significantly decreased after MP modification compared with the blank sample. With the increase of MP, the size of cracks and char blocks on the ablation center of the composites were reduced, and the surface was flat and dense. The Interlaminar shear strength (ILSS) of carbonized composites (5 wt% MP) were 9.79 MPa, and the flexural strength was 121.5 MPa, which improved 62.9% and 40.8% relative to the pure sample. The flexural strength of 5 wt% MP‐reinforced carbon/phenolic composites reached 525.6 MPa, which was 26.9% higher than that of pure carbon/phenolic composites, mainly due to the particle reinforcement effect of MP distributed between carbon fibers. The above results show that the carbon/phenolic composites modified by MP has great application prospects in the field of aircraft thermal protection.

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Section: Resultsmentioning

confidence: 99%

Section: Characteristics and Ablation Properties Of Fiber-reinforced ...mentioning

confidence: 99%

Enhanced ablation resistance of carbon/phenolic composites based on mesophase pitch reinforced particles

Yue,

Huang,

Zou

et al. 2023

J of Applied Polymer Sci

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“…Consequently, the optical texture of the mesophase pitch product deteriorates. When the pressure reaches 2.0 MPa, excessive pressure impedes the coalescence of mesophase microspheres, resulting in incomplete development of mesophase pitch [31,32]. Thus, the research team determined a reaction pressure of 1.0 MPa.…”

Section: Determination Of Reaction Pressurementioning

confidence: 99%

The Neglected Role of Asphaltene in the Synthesis of Mesophase Pitch

Wang,

Li,

Wang

et al. 2024

Molecules

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This study investigates the synthesis of mesophase pitch using low-cost fluid catalytic cracking (FCC) slurry and waste fluid asphaltene (WFA) as raw materials through the co-carbonization method. The resulting mesophase pitch product and its formation mechanism were thoroughly analyzed. Various characterization techniques, including polarizing microscopy, softening point measurement, Fourier-transform infrared spectroscopy (FTIR), and thermogravimetric analysis (TGA), were employed to characterize and analyze the properties and structure of the mesophase pitch. The experimental results demonstrate that the optimal optical texture of the mesophase product is achieved under specific reaction conditions, including a temperature of 420 °C, pressure of 1 MPa, reaction time of 6 h, and the addition of 2% asphaltene. It was observed that a small amount of asphaltene contributes to the formation of mesophase pitch spheres, facilitating the development of the mesophase. However, excessive content of asphaltene may cover the surface of the mesophase spheres, impeding the contact between them and consequently compromising the optical texture of the mesophase pitch product. Furthermore, the inclusion of asphaltene promotes polymerization reactions in the system, leading to an increase in the average molecular weight of the mesophase pitch. Notably, when the amount of asphaltene added is 2%, the mesophase pitch demonstrates the lowest ID/IG value, indicating superior molecular orientation and larger graphite-like microcrystals. Additionally, researchers found that at this asphaltene concentration, the mesophase pitch exhibits the highest degree of order, as evidenced by the maximum diffraction angle (2θ) and stacking height (Lc) values, and the minimum d002 value. Moreover, the addition of asphaltene enhances the yield and aromaticity of the mesophase pitch and significantly improves the thermal stability of the resulting product.

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“…20 In the preparation process of mesophase pitch, the top priority lies in the selection of raw materials. The main raw materials, at current stage, are coal pitch, [21][22][23] aromatic compounds [24][25][26] and petroleum pitch. [27][28][29] Among them, the advanced process acts as the preparation of mesophase pitch from coal tar pitch, which is also of interest to researchers due to its high degree of condensation and reactivity.…”

Section: Introductionmentioning

confidence: 99%

Research progress in the preparation of mesophase pitch from fluid catalytic cracking slurry

Yang

Chen

et al. 2023

RSC Adv.

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Pressure-Strengthened Carbon Fibers from Mesophase Pitch Carbonization Processes

Cited by 12 publications

References 22 publications

Enhanced ablation resistance of carbon/phenolic composites based on mesophase pitch reinforced particles

Enhanced ablation resistance of carbon/phenolic composites based on mesophase pitch reinforced particles

The Neglected Role of Asphaltene in the Synthesis of Mesophase Pitch

Research progress in the preparation of mesophase pitch from fluid catalytic cracking slurry

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