Abstract:The aim of this study is to develop and characterize carbon fiber (CF)‐reinforced polyetherimide (PEI) composite materials that can be used in aerospace and defense industries. Four different composite materials with 60/40 and 40/60 resin/fiber weight ratios were prepared by hand lay‐up using unidirectional (UD) CFs and TWILL CFs. It was determined that, the thermal stability of composite materials is independent of CFs. PEI resin and composite materials soften above 200°C and decompose above 500°C. Also, PEI … Show more
“…The ratio of the PAN in the resin solution prepared and the weight of the carbon fibers must be in an equal ratio to ensure a good composite with greater bond strength. 9,10 The amount of PAN utilized for this process was 50 g. Therefore, carbon fibers weighing 50 g (with seven layers of carbon fibers) were utilized for the wet layup of the composite process. Figure 3 shows the process flow of the PAN based fiber reinforced C-C composite manufacturing.Figure 3.Process flow diagram of the PAN based fiber reinforced C-C composite manufacturing.…”
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 ratio of the PAN in the resin solution prepared and the weight of the carbon fibers must be in an equal ratio to ensure a good composite with greater bond strength. 9,10 The amount of PAN utilized for this process was 50 g. Therefore, carbon fibers weighing 50 g (with seven layers of carbon fibers) were utilized for the wet layup of the composite process. Figure 3 shows the process flow of the PAN based fiber reinforced C-C composite manufacturing.Figure 3.Process flow diagram of the PAN based fiber reinforced C-C composite manufacturing.…”
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 main preparation processes for short carbon fiber reinforced thermoplastic composites are wet preparation process and mixing preparation process, which will all reduce the fiber length 14,15 . Wet molding process is mainly spiral stirring dispersion of carbon fibers, fiber length is significantly shorter, not conducive to the preparation of high‐performance composites 16 . Currently, the length of fibers used for the preparation of short carbon fiber composites range between (3–10 mm), When fiber length is between (3–10 mm), CFRTP mainly rely on the resin bonding, and increasing the fiber length can improve the fiber embedded in the resin length, improve the mutual hook between the fibers and the mechanical properties of CFRTP.…”
Carbon fiber reinforced thermoplastic composites have such advantages as low density, high strength, high temperature resistance, impact resistance, and good ductility, but due to the density difference between carbon fibers and resin fibers, it is difficult to mix them uniformly. Hence, it is difficult to prepare the composites with the uniform properties. In order to solve this problem, a preparation process based on solid phase mixing of carbon and resin fibers by suspension method is proposed in this paper. The carbon fiber reinforced thermoplastic composites (CFRTPs) can be prepared by dispersing carbon fibers of a certain length (~50 mm) and resin fibers in suspension through ultrasound‐assisted and churn‐combing methods. The effects of carbon fiber length, content and molding process on the mechanical properties of the CFRTPs were studied. The results show that the carbon fiber content and length are the main factors affecting the mechanical properties as well as void ratio of CFRTP. The performance of composites is significantly improved with the increase of carbon fiber length. While the length of carbon fiber is 50 mm and the content is 30 wt%, the prepared CFRTP has the best performance, with the tensile strength of 182.1 MPa, the bending strength of 354.3 MPa, the impact strength of 67.2 KJ·m−2, and the material void ratio of 0.65%. The study shows that the suspension method is feasible for the preparation of the CFRTPs. It is beneficial to improve production efficiency and decrease cost of production for the CFRTPs.Highlights
Carbon fiber reinforced thermoplastic composites can be prepared by dispersing carbon fibers of a certain length (~50 mm) and resin fibers in suspension through ultrasound‐assisted and churn‐combing methods.
Through the cooling‐high pressure molding process, the porosity of CFRTP is reduced and the mechanical properties of CFRTP are improved.
The tensile strength, bending strength, and notch‐free impact strength properties of CFRTP are best when the carbon fiber content is 30% and the CF length is 50 mm.
The method is characterized by simple process, low cost and high mechanical properties.
“…Thermoplastic composites have excellent toughness, secondary processability and recyclability, and have attracted more and more attention in recent years 1–4 . Among them, continuous carbon fiber reinforced polyether ether ketone (PEEK) composites are widely used in aviation, marine, and automotive industries because of their excellent performance –6 .…”
Section: Introductionmentioning
confidence: 99%
“…Thermoplastic composites have excellent toughness, secondary processability and recyclability, and have attracted more and more attention in recent years. [1][2][3][4] Among them, continuous carbon fiber reinforced polyether ether ketone (PEEK) composites are widely used in aviation, marine, and automotive industries because of their excellent performance. -6 Studies on the interfacial properties of carbon fiber reinforced PEEK composites showed that the fiber-resin interface is significantly higher compared to that of other thermoplastic systems.…”
The preparation of continuous carbon fiber reinforced polyether ether ketone (PEEK) composites by the powder slurry method has many advantages, but the stability of PEEK suspension is required to be high. So far, there is a lack of in‐depth studies on the aqueous suspension of PEEK. In this study, two non‐ionic surfactants were selected for compounding. Then PEEK aqueous suspension and continuous carbon fiber reinforced PEEK composites were prepared. The stability mechanism of PEEK aqueous suspension with different surfactants was analyzed. Studies have shown that in the PEEK aqueous suspension, Triton X‐100 can help to infiltrate the PEEK powder. The steric hindrance of polyethylene glycol contributes to the stability of the suspension. The synergistic steric hindrance effect of the two surfactants can increase the stability time of PEEK suspension from 5 min to more than 50 min. The PEEK composites prepared by the powder slurry method has good quality stability, the fiber volume fraction is about 60%, the flexural strength of the composites can reach 1336 MPa, and the interlayer shear strength can reach 106 MPa. This study provides useful insights for the stability mechanism of PEEK aqueous suspension, and can guide the preparation process of thermoplastic composites by powder slurry method.
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