“…The wavelength 1730.07 cm −1 (C=O stretch) revealed that the C=O functional group was present in the modest fraction of polymer and DMF. 33,34 Figure 15.FTIR graph of actual PAN-carbon fiber composite sample without oxidation and carbonization.…”
Section: Resultsmentioning
confidence: 99%
“…Thus, it can be shown that oxidation did not affect the DSC analysis much, but after carbonization of the composite sample, oxidation has a greater impact on the DSC analysis, and no exothermic peak was observed for carbonized samples, which indicates no release of heat at around 250°C after the thermal composition changed due to carbonization. 34–37…”
Section: Resultsmentioning
confidence: 99%
“…33 These carbon-rich composites have very high thermal stabilities, which may be useful for different industry applications. 34 –37…”
Section: Resultsmentioning
confidence: 99%
“…This C-C composite has a high electrical conductivity value, which can be used for various aerospace and other industry applications. 34…”
Section: Resultsmentioning
confidence: 99%
“…After carbonization at 850°C, the electrical conductivity rose from 1.15 ×10 3 S/m to 4.75 × 10 3 S/m, whereas carbon fiber has an electrical conductivity of only 106 S/m, 38 which indicates that the carbonization at elevated temperature has a great impact on the electrical conductivity of a carbon-carbon composite. 34 Also, the other primary reasons for having higher electrical conductivity may be associated with the carbonization, graphitization, and densification of the new carbon structures. 35–37…”
Carbon-carbon (C-C) fiber composites are a new class of materials that are used in various industries due to their exceptional chemical, thermal and electrical conductivities properties. In this study, carbon-carbon fiber composites were manufactured where polyacrylonitrile (PAN) powder was dissolved in dimethylformamide (DMF) solution, and carbon fibers with desired concentrations (20–80 wt%) were immersed into this solution as reinforcement through evaporation and solidification. The PAN-fiber systems were then stabilized at 250–270°C for 120 min in the air and subsequently carbonized at 650, 750, and 850°C for 60 min in the presence of argon gas to obtain the desired C-C fiber composites. Thermogravimetric analysis (TGA) results showed that the carbonized samples had a small weight loss of 2.5%, while actual and oxidized samples had more weight loss. Moreover, the carbonized sample surface was more hydrophobic compared to other samples due to the carbon presence and surface texture changes. Fourier-Transform Infrared (FTIR) spectroscopy peaks showed the presence of different functional groups of PAN before oxidation and carbonization, but those peaks disappeared after oxidation and carbonization. The developed carbon-carbon composite passed the UL94 vertical flame retardancy testing with a V-0 rating. Surface smoothness, proper matrix and reinforcements bonding were confirmed by scanning electron microscopy (SEM) results and the manufactured composite properties changes were validated by the confocal microscopy images. The carbon-carbon fiber composite achieved an electrical conductivity value up to 4.75 × 103 S/m after the carbonization process. The excellent thermal, chemical, and electrical properties of these composites can be useful for numerous industrial applications in different extreme environments.
“…The wavelength 1730.07 cm −1 (C=O stretch) revealed that the C=O functional group was present in the modest fraction of polymer and DMF. 33,34 Figure 15.FTIR graph of actual PAN-carbon fiber composite sample without oxidation and carbonization.…”
Section: Resultsmentioning
confidence: 99%
“…Thus, it can be shown that oxidation did not affect the DSC analysis much, but after carbonization of the composite sample, oxidation has a greater impact on the DSC analysis, and no exothermic peak was observed for carbonized samples, which indicates no release of heat at around 250°C after the thermal composition changed due to carbonization. 34–37…”
Section: Resultsmentioning
confidence: 99%
“…33 These carbon-rich composites have very high thermal stabilities, which may be useful for different industry applications. 34–37…”
Section: Resultsmentioning
confidence: 99%
“…This C-C composite has a high electrical conductivity value, which can be used for various aerospace and other industry applications. 34…”
Section: Resultsmentioning
confidence: 99%
“…After carbonization at 850°C, the electrical conductivity rose from 1.15 ×10 3 S/m to 4.75 × 10 3 S/m, whereas carbon fiber has an electrical conductivity of only 106 S/m, 38 which indicates that the carbonization at elevated temperature has a great impact on the electrical conductivity of a carbon-carbon composite. 34 Also, the other primary reasons for having higher electrical conductivity may be associated with the carbonization, graphitization, and densification of the new carbon structures. 35–37…”
Carbon-carbon (C-C) fiber composites are a new class of materials that are used in various industries due to their exceptional chemical, thermal and electrical conductivities properties. In this study, carbon-carbon fiber composites were manufactured where polyacrylonitrile (PAN) powder was dissolved in dimethylformamide (DMF) solution, and carbon fibers with desired concentrations (20–80 wt%) were immersed into this solution as reinforcement through evaporation and solidification. The PAN-fiber systems were then stabilized at 250–270°C for 120 min in the air and subsequently carbonized at 650, 750, and 850°C for 60 min in the presence of argon gas to obtain the desired C-C fiber composites. Thermogravimetric analysis (TGA) results showed that the carbonized samples had a small weight loss of 2.5%, while actual and oxidized samples had more weight loss. Moreover, the carbonized sample surface was more hydrophobic compared to other samples due to the carbon presence and surface texture changes. Fourier-Transform Infrared (FTIR) spectroscopy peaks showed the presence of different functional groups of PAN before oxidation and carbonization, but those peaks disappeared after oxidation and carbonization. The developed carbon-carbon composite passed the UL94 vertical flame retardancy testing with a V-0 rating. Surface smoothness, proper matrix and reinforcements bonding were confirmed by scanning electron microscopy (SEM) results and the manufactured composite properties changes were validated by the confocal microscopy images. The carbon-carbon fiber composite achieved an electrical conductivity value up to 4.75 × 103 S/m after the carbonization process. The excellent thermal, chemical, and electrical properties of these composites can be useful for numerous industrial applications in different extreme environments.
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