Zeitschriftenartikel: „CF/PEKK composite“

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Jin, Jianghai, Yuequan Wang, Jiaqi Shi und Yu Liu. „CF/PEKK advanced pultrusion thermoforming process temperature field simulation“. Journal of Physics: Conference Series 2566, Nr. 1 (01.08.2023): 012126. http://dx.doi.org/10.1088/1742-6596/2566/1/012126.

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Abstract Advanced pultrusion molding technology is one of the composite molding processes. It has unique advantages in the automated manufacturing of long trusses and long beam components. Thermoplastic composites are becoming popular for research in many fields such as aerospace because of their room-temperature storage and secondary use. Since the temperature history is critical to the molding quality of thermoplastic composites, the temperature field variation of CF/PEKK composites in the advanced pultrusion thermoforming process has been explored in the context of studying the advanced pultrusion molding process of thermoplastic composites in this paper. By constructing a 3D model of the temperature field and setting up a complete solution scheme in ANSYS simulation software, the simulated temperature field data were obtained, and a real-time temperature monitoring platform was set up to obtain the measured temperature data, and the comparison showed that the two temperature profiles fit well, which proved the applicability of the model and solution scheme to this study.

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Modi, Vedant, Aswani Kumar Bandaru, Karthik Ramaswamy, Conor Kelly, Conor McCarthy, Tomas Flanagan und Ronan O’Higgins. „Repair of Impacted Thermoplastic Composite Laminates Using Induction Welding“. Polymers 15, Nr. 15 (29.07.2023): 3238. http://dx.doi.org/10.3390/polym15153238.

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The lack of well-developed repair techniques limits the use of thermoplastic composites in commercial aircraft, although trends show increased adoption of composite materials. In this study, high-performance thermoplastic composites, viz., carbon fibre (CF) reinforced Polyetherketoneketone (PEKK) and Polyether ether ketone (PEEK), were subjected to low-velocity impact tests at 20 J. Post-impact, the damaged panels were repaired using an induction welder by applying two different methods: induction welding of a circular patch to the impacted area of the laminate (RT-1); and induction welding of the impacted laminates under the application of heat and pressure (RT-2). The panels were subjected to compression-after-impact and repair (CAI-R), and the results are compared with those from the compression-after-impact (CAI) tests. For CF/PEKK, the RT-1 and RT-2 resulted in a 13% and 7% higher strength, respectively, than the value for CAI. For CF/PEEK, the corresponding values for RT-1 and RT-2 were higher by 13% and 17%, respectively. Further analysis of the damage and repair techniques using ultrasonic C-scans and CAI-R tests indicated that induction welding can be used as a repair technique for industrial applications. The findings of this study are promising for use in aerospace and automotive applications.

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Premanand, Aravind, Mario Prescher, Michael Rienks, Lutz Kirste und Frank Balle. „Online and Ex Situ Damage Characterization Techniques for Fiber-Reinforced Composites under Ultrasonic Cyclic Three-Point Bending“. Polymers 16, Nr. 6 (13.03.2024): 803. http://dx.doi.org/10.3390/polym16060803.

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With ultrasonic fatigue testing (UFT), it is possible to investigate the damage initiation and accumulation from the weakest link of the composite material in the very high cycle fatigue (VHCF) regime in a shorter time frame than conventional fatigue testing. However, the thermal influence on the mechanical fatigue of composites and the scatter in fatigue data for composites under ultrasonic cyclic three-point bending loading still need to be investigated. In this study, we conducted interrupted constant-amplitude fatigue experiments on a carbon-fiber satin-fabric reinforced in poly-ether-ketone-ketone (CF-PEKK) composite material. These experiments were carried out using a UFT system, which operates at a cyclic frequency of 20 kHz with a pulse–pause sequence. Various parameters, such as the CF-PEKK specimen’s surface temperature, acoustic activity, and the ultrasonic generator’s input resonance parameters, were measured during cyclic loading. During experiment interruption, stiffness measurement and volumetric damage characterization in the CF-PEKK specimens using 3D X-ray microscopy (XRM) were performed. The locations of damage initiation and accumulation and their influence on the changes in in situ parameters were characterized. Under fixed loading conditions, damage accumulation occurred at different locations, leading to scattering in fatigue life data. Further, the damage population decreased from the surface to the bulk of the composite material.

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Quadrini, Fabrizio, Denise Bellisario, Leandro Iorio, Alice Proietti und Loredana Santo. „Additive Layer Manufacturing of Carbon Fiber/PEKK Composites for Aeronautic Application“. Materials Science Forum 1107 (06.12.2023): 9–13. http://dx.doi.org/10.4028/p-xa6tlb.

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A 3d printer has been prototyped for additive manufacturing of carbon fiber (CF) poly-ether-ketone-ketone (PEKK) composites. The machine consisted of a SCARA robot, equipped with an extrusion device. The nozzle was designed to allow the deposition of thin unidirectional (UD) tapes without affecting the fiber continuity. An elastic connection between the robot end-effector and the extruder was used for allowing tape agglomeration during manufacturing. Deposition tests were carried out at the extrusion temperature of 400°C and the rate of 130 mm/min, for a maximum number of 3 layers on a CF-epoxy laminate as substrate. The good agglomeration of the 3d printed parts and their adhesion on the composite substrate are shown by the resulted final thickness, and the ability to machine them by end milling. Results show the feasibility of using this technology for the manufacturing of composite shims in the aeronautic sector.

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Cheng, Zhitong, Junwei Qi, Yuequan Wang und Jianghai Jin. „Optimization of CF/PEKK molding process by orthogonal experiment“. Journal of Physics: Conference Series 2566, Nr. 1 (01.08.2023): 012123. http://dx.doi.org/10.1088/1742-6596/2566/1/012123.

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Abstract Composite materials have gradually entered people’s attention due to their advantages such as lightweight, high strength, corrosion resistance, fatigue resistance, and strong designability. Widely used in aviation, aerospace, automotive and other fields.[1-4].. The basic mechanical properties of the laminates were evaluated through short beam shear and bending tests. The optimum forming process was determined by orthogonal test: forming temperature 380°C, forming pressure 2 MPa, holding time 60 min, cooling rate 2°C/min. The interlaminar shear strength of this process was 103.42 MPa, and the bending strength was 1570 MPa

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Hou, Meng, und David De Weger. „Optimisation of Manufacturing Conditions of Carbon Fibre Reinforced Polyetherketoneketone (PEKK) Composite“. Advanced Materials Research 399-401 (November 2011): 289–93. http://dx.doi.org/10.4028/www.scientific.net/amr.399-401.289.

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The effects of different processing conditions (pressure, holding time and temperature) on the impregnation/consolidation quality of CF/PEKK composite were investigated using compression molding process. Microscopic investigation of cross-sections, density measurements and flexural mechanical properties were used to examine the quality of impregnation and consolidation. A qualitative model to describe the impregnation and consolidation process of this material was developed. The model predicts the variations of void content during consolidation as well as the holding time, moulding temperature and pressure required to reach full consolidation. Good agreement between theoretical predictions and experimental data was achieved. Optimum processing conditions can be determined based on selected void content.

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Premanand, Aravind, Michael Rienks und Frank Balle. „Damage assessment during ultrasonic fatigue testing of a CF-PEKK composite using self-heating phenomenon“. International Journal of Fatigue 180 (März 2024): 108084. http://dx.doi.org/10.1016/j.ijfatigue.2023.108084.

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Kumar, Sumodh, Nidhi Ojha, M. R. Ramesh, A. S. S. Balan und Mrityunjay Doddamani. „Shape memory behavior of 4D printed CF/PEKK high temperature composite under subsequent thermomechanical cycles“. Materials Letters 366 (Juli 2024): 136567. http://dx.doi.org/10.1016/j.matlet.2024.136567.

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Nachtane, M., M. Tarfaoui, Y. Ledoux, S. Khammassi, E. Leneveu und J. Pelleter. „Experimental investigation on the dynamic behavior of 3D printed CF-PEKK composite under cyclic uniaxial compression“. Composite Structures 247 (September 2020): 112474. http://dx.doi.org/10.1016/j.compstruct.2020.112474.

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Lee, Kyo-Moon, Soo-Jeong Park, Tianyu Yu, Seong-Jae Park und Yun-Hae Kim. „Experimental prediction of internal defects according to defect area on NDI via water absorption behavior“. International Journal of Modern Physics B 35, Nr. 14n16 (30.06.2021): 2140021. http://dx.doi.org/10.1142/s021797922140021x.

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This study analyzed the relationship between the defect area identified through a C-scan and the void volume in CF-PEKK composite materials through the water absorption behavior to predict the void volume. The water absorption content varies with the defect area; however, the defect area identified through a C-scan and the water absorption content did not show a proportional relationship. This is because voids are distributed in the through-thickness. The results indicated that the absorption behavior could be used to predict the void volume. Irreversible absorption was found to be independent of the void volume. Further, no matrix degradation was seen with water immersion at [Formula: see text]C; however, some local swelling was seen.

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Premanand, Aravind, Tomasz Rogala, Dominik Wachla, Jafar Amraei, Andrzej Katunin, Bilal Khatri, Michael Rienks und Frank Balle. „Fatigue strength estimation of a CF/PEKK composite through self-heating temperature analysis using cyclic bending tests at 20 kHz“. Composites Science and Technology 243 (Oktober 2023): 110218. http://dx.doi.org/10.1016/j.compscitech.2023.110218.

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Zhang, Jian Guo, und Chi Lan Cai. „Friction and Wear Properties of Carbon Fiber Reinforced PEEK Composites under Water Lubrication“. Applied Mechanics and Materials 66-68 (Juli 2011): 1051–54. http://dx.doi.org/10.4028/www.scientific.net/amm.66-68.1051.

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The present study establishes the relationships between the carbon fibers (CF) content and the trbological properties of Polyether ether ketone (PEEK) composite. PEEK composites such as unreinforced PEEK, reinforced PEEK with different content of carbon fibres were used for the tribological tests. The results indicated that CF/PEEK composite had better tribological properties than pure PEEK. Some CF was ground and squeezed, then mixed with debris on the worn surface, which improved the wear resistance greatly. The low friction coefficient of CF/PEEK composite caused little change in the temperature and further ensured the stable state of sliding.

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Liu, Fan, Yanhong Wang, Xiaofu Qu, Lin Liu und Guang Hong. „Repair of Alveolar Bone Defects with Osteogenic Polypeptide Modified HA_CF_PEEK Dental Implants“. Science of Advanced Materials 14, Nr. 10 (01.10.2022): 1539–49. http://dx.doi.org/10.1166/sam.2022.4353.

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The implant implanted into the body directly interacts with the bone tissue around the implant through its surface. The surface properties of the implant can affect the adhesion, proliferation, and differentiation of surrounding cells and ultimately determine the quality of osseointegration and the effect of implantation surgery. In this project, nano-hydroxyapatite (n-HA) and carbon fiber (CF) were added into the matrix, poly(ether-ether-ketone) (PEEK), forming the composite material HA/CF/PEEK. Since biologically active proteins and peptides can promote cell viability and proliferation, the osteogenic polypeptide sequence BEE1 was polymerized and grafted onto the surface of HA/CF/PEEK composites to generate HA/CF/PEEK-DPP and HA/CF/PEEK-DPP-BEE1 composites. The above materials were tested for physical characterization and in vitro cell activity by establishing a Beagle dog dentition defect model. HA/CF/PEEK type composites were selected for peri-implant bone defect repair and compared with titanium mesh alone or Bio-Gide membrane for alveolar bone defect repair. In the experiment, the HA/CF/PEEK material modified with osteogenic polypeptides changed in element composition, hydrophilicity, and surface morphology. in vitro cell assays detected that the surface of HA/CF/PEEK material modified with osteogenic polypeptides was more conducive to cell adhesion and proliferation and had no cytotoxicity. The peri-implant defect repair test showed that the HA/CF/PEEK-DPP-BEE1 composite material for alveolar bone repair in experimental dogs was better than that of titanium mesh or Bio-Gide membrane. Meanwhile, the mineralization speed and histomorphometry test at the bone defect further proved that this material could better promote bone neogenesis at the defect. Mineralization.

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Hassan, Elwathig A. M., Dengteng Ge, Lili Yang, Jianfeng Zhou, Mingxia Liu, Muhuo Yu und Shu Zhu. „Highly boosting the interlaminar shear strength of CF/PEEK composites via introduction of PEKK onto activated CF“. Composites Part A: Applied Science and Manufacturing 112 (September 2018): 155–60. http://dx.doi.org/10.1016/j.compositesa.2018.05.029.

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Zhu, Yan Ji, Hui Juan Qian, Gui Ying Wang und Huai Yuan Wang. „Tribological Behaviors of Polymer Based Composites under Alkaline Conditions“. Advanced Materials Research 510 (April 2012): 563–68. http://dx.doi.org/10.4028/www.scientific.net/amr.510.563.

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In this paper, polyetheretherketone (PEEK) and polytetrafluoroethylene (PTFE) based composites reinforced with various amounts of potassium titanate whiskers (PTWs) or short carbon fibers (CF) were designed and fabricated respectively. The friction and wear properties of PEEK and PTFE based composites sliding under rigorous alkaline were comparatively investigated. Also, the morphologies of the worn and counterpart surfaces were studied by scanning electron microscopy (SEM). Because of the stable tunnel crystal structure and frame structure micro-reinforcement capacity, PTWs show outstanding performances in increasing the wear resistance and reducing the friction coefficients of both PEEK and PTFE based composites under alkaline. However, CF leads to the degradation of wear resistance and the increase of friction coefficient of PEEK based composites under alkaline. Furrows and abrasive wear were the main mechanisms for CF/PTFE/PEEK and CF/PTFE composites sliding in alkali. The results show that PTW/PTFE composites exhibit higher wear resistance under lower load, while PTW/PTFE/PEEK composite is more suitable for higher load under alkaline condition. Owing to the primary cooling and boundary lubricating effects of alkali, the wear rates and friction coefficients of PTFE composites and PTW/PTFE/PEEK composites decreased obviously, though the transfer films onto the counterpart steel surface were hindered considerably.

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Kareem, Aseel A., und Hussein Kh Rasheed. „Electrical and thermal characteristics of MWCNTs modified carbon fiber/epoxy composite films“. Materials Science-Poland 37, Nr. 4 (01.12.2019): 622–27. http://dx.doi.org/10.2478/msp-2019-0081.

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AbstractTo enhance interfacial bonding between carbon fibers and epoxy matrix, the carbon fibers have been modified with multiwall carbon nanotubes (MWCNTs) using the dip- coating technique. FT-IR spectrum of the MWCNTs shows a peak at 1640 cm−1 corresponding to the stretching mode of the C=C double bond which forms the framework of the carbon nanotube sidewall. The broad peak at 3430 cm−1 is due to O–H stretching vibration of hydroxyl groups and the peak at 1712 cm−1 corresponds to the carboxylic (C=O) group attached to the carbon fiber. The peaks at 2927 cm−1 and 2862 cm−1 are assigned to C–H stretching vibration of epoxy produced at the defect sites of acid-oxidized carbon fiber surface. SEM image shows a better interface bonding between the fiber and the matrix of modified composites (MWCNTs-CF/Ep) than those of unmodified composite. The loss factor curve of CF-MWCNTs/Ep composites is the narrowest compared with neat epoxy and CF/Ep composites which evinces that the length distribution range of molecular chain segments in the matrix is the narrowest. From the dependence of the AC conductivity on temperature, we can see that σAC increases when temperature increases. The increase in electrical conductivity of the composites may be a result of the increased chain ordering due to annealing effect. The use of MWCNTs to modify the surface of carbon fiber resulted in a large amount of junctions among MWCNT causing an increase in the electrical and thermal conductivity by forming conducting paths in the matrix. The MWCNTs-CF/Ep composite shows better thermal stability than unmodified composites. The strong interaction between CF and MWCNTs can retard diffusion of small molecules from the resin matrix at high temperature and hence, result in the improved thermal stability of the modified CF/Ep composite.

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Wang, Zhicheng. „Progress in the Preparation Process and Application of Carbon Fiber Reinforced PEEK Composites“. MATEC Web of Conferences 386 (2023): 01009. http://dx.doi.org/10.1051/matecconf/202338601009.

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Due to their outstanding overall performances, carbon fiber/poly(ether-ether-ketone) (CF/PEEK) composites have attracted a lot of interest recently. High-performance CF/PEEK composites have many advantages such as high strength, good toughness, and high service temperature, which have been widely used in various high-precision fields. This paper reviews the research progress of the CF/PEEK composite molding process and its applications in view of the research hotspots in recent years, laying the foundation for the research on the preparation technology and industrial application of the material. CF/PEEK molding process mainly includes injection molding, press molding, filament winding, 3D Printing, and automated fiber placement (AFP). Different processing methods and material ratios result in CF/PEEK materials with different mechanical properties. Since CF/PEEK has its own unique advantages over traditional metal materials in terms of mechanical properties, corrosion resistance, and density, CF/PEEK materials can be used to replace metal materials in many applications, such as aviation and aerospace, biomedical field and automotive part.

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Guo, Yue, Xuhui Chen, Guorong Wu und Shiwen Huang. „Tunable Thermal, Mechanical, and Tribological Properties of Polybenzoxazine-Based Composite for Vehicle Applications“. Coatings 13, Nr. 7 (24.06.2023): 1147. http://dx.doi.org/10.3390/coatings13071147.

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In this study, a series of composites comprising polyether ether ketone (PEEK) and carbon fiber (CF)-reinforced polybenzoxazine for high-temperature friction materials for vehicle brake applications were developed using a high-temperature compression molding technique. The objective of this research was to systematically investigate the thermal, mechanical (tensile and flexural), and tribological performance of friction materials made from polybenzoxazine-based composites by varying the PEEK/CF mass ratio. Our study reveals the substantial improvement effect of the increased content of PEEK fibers on the thermal conductivity, the coefficient of friction, and the friction strength of the polybenzoxazine-based composite materials. Meanwhile, the introduction of carbon fibers was found to have a monotonic positive effect on the mechanical (tensile and flexural) properties and wear performance of the polybenzoxazine-based composites. The polybenzoxazine-based composites exhibit high mechanical strength, with a tensile strength of 50.1–78.6 MPa, Young’s modulus of 10.2–24.3 GPa, a flexural strength of 62.1–88.3 MPa, and a flexural modulus of 13.1–27.4 GPa. In addition, the polybenzoxazine-based composite with a PEEK/CF mass ratio of 75:25 exhibits a high and stable coefficient of friction (0.33) and a specific wear rate (1.79 × 10−7 cm3/Nm at room temperature). Subsequent to the wear test at ambient temperature, the worn surfaces of five polybenzoxazine-based composite samples with various PEEK/CF mass ratios were studied using electron microscopy technology (SEM). The observation of small cracks and tiny grooves on the worn surfaces indicates a combined abrasive and adhesive wear mechanism of the material. Our experimental results clearly reveal superior mechanical properties and excellent tribological characteristics. As a result, these composites show promising potential for the application of friction materials in terms of vehicle braking system applications.

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Wang Mengjie, 王孟洁, 王菲 Wang Fei, 张承双 Zhang Chengshuang, 金才植 Jin Caizhi, 包艳玲 Bao Yanling, 张承灏 Zhang Chenghao, 刘冬 Liu Dong, 吴静 Wu Jing und 苏忠民 Su Zhongmin. „平顶激光辐照CF/PEEK复合材料熔凝过程有限元仿真“. Laser & Optoelectronics Progress 60, Nr. 13 (2023): 1316020. http://dx.doi.org/10.3788/lop230510.

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Gil-Albarova, Jorge, María José Martínez-Morlanes, José Miguel Fernández, Pere Castell, Luis Gracia und José Antonio Puértolas. „Evaluation of Cytocompatibility of PEEK-Based Composites as a Function of Manufacturing Processes“. Bioengineering 10, Nr. 11 (17.11.2023): 1327. http://dx.doi.org/10.3390/bioengineering10111327.

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The biocompatible polymer polyetheretherketone (PEEK) is a suitable candidate to be part of potential all-polymer total joint replacements, provided its use is associated with better osseointegration, mechanical performance, and wear resistance. Seeking to meet the aforementioned requirements, respectively, we have manufactured a PEEK composite with different fillers: carbon fibers (CF), hydroxyapatite particles (HA) and graphene platelets (GNP). The mechanical outcomes of the composites with combinations of 0, 1.5, 3.0 wt% GNP, 5 and 15 wt% HA and 30% of wt% CF concentrations pointed out that one of the best filler combinations to achieve the previous objectives was 30 wt% CF, 8 wt% HA and 2 wt% of GNP. The study compares the bioactivity of human osteoblasts on this composite prepared by injection molding with that on the material manufactured by the Fused Filament Fabrication 3D additive technique. The results indicate that the surface adhesion and proliferation of human osteoblasts over time are better with the composite obtained by injection molding than that obtained by 3D printing. This result is more closely correlated with morphological parameters of the composite surface than its wettability behavior.

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Kim, Dae Hoon, Min Hyung Kim, Ji Hoon Lee, J. H. Lim, K. M. Kim, B. C. Lee, Joung Man Park und Sung Ryong Kim. „Synergistic Effect of Hybrid Filler Contained Composites on Thermal Conductivity“. Materials Science Forum 544-545 (Mai 2007): 483–86. http://dx.doi.org/10.4028/www.scientific.net/msf.544-545.483.

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Thermal conductivity of polyetheretherketone (PEEK) with fillers was investigated. By adding the hybrid fillers to polymer the thermal conductivity of composites was increased significantly. Thermal diffusivity of composites was measured using laser flash method. Synergistic filler effect between particulate SiC and carbon fiber (CF) was observed for thermal conductivity. In a PEEK based composite, thermal conductivity increased to 8.25 W/m-K for a 50 vol% hybrid filler (SiC+CF) system, whereas the thermal conductivity of 40 vol% CF was 3.1 W/m-K and 50 vol% of SiC was 2.4 W/m-K, respectively. The use of hybrid filler was found to be effective in increasing thermal conductivity of its composites due to formation of effective thermal conductive path. Experimental results of two-phase system were compared with Nielsen prediction.

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Li, Jiang, Fulun Peng, Hongguang Li, Zhibing Ru, Junjie Fu und Wen Zhu. „Material Evaluation and Dynamic Powder Deposition Modeling of PEEK/CF Composite for Laser Powder Bed Fusion Process“. Polymers 15, Nr. 13 (28.06.2023): 2863. http://dx.doi.org/10.3390/polym15132863.

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Polymeric composites such as Poly-ether-ether-ketone (PEEK)/carbon fiber (CF) have been widely utilized due to outstanding performances such as high specific strength and specific modulus. The PEEK/CF components via powder bed fusion additive manufacturing usually show brittle fracture behaviors induced by their poor interfacial affinity and inner voids. These defects are strongly associated with powder packing quality upon deposition. The particle dynamic model has been widely employed to study the interactions of particle motions. Powder property, bulk material property, and interfacial features of composite powders are key factors in the particle dynamic model. In this work, an efficient and systematic material evaluation is developed for composite powders to investigate their deposition mechanism. The discrete element method is utilized to simulate the dynamic behaviors of PEEK/CF composite powders. The powder properties, bulk material properties, and interfacial features of powders are calibrated and justified by experimental measurement, numerical simulation, and design of experiments. The particle dynamic model can explain the powder flow behaviors and interactions. The experimental and simulation AOR results show a maximal deviation of 4.89%. It reveals that the addition of short CF particles can assist the flow of PEEK powders and improve the packing quality of the composite powders. The results show an experimental improvement of 31.3% and 55.2% for PEEK/CF_30wt% and PEEK/CF_50wt%, with a simulated improvement of 27.4% and 50.2% for corresponding composite powders.

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Zhu, Hao, und Yong Li. „Study on preparation process and seawater corrosion resisting properties of chopped CF/PEEK composites“. Journal of Physics: Conference Series 2587, Nr. 1 (01.09.2023): 012007. http://dx.doi.org/10.1088/1742-6596/2587/1/012007.

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Abstract CF/PEEK composite material is widely used in marine engineering construction due to its characteristics of lightweight, high strength, corrosion resistance, and aging resistance, and it will inevitably produce side materials and wastes in the forming process. Therefore, the research on CF/PEEK recycling is of great significance. Due to the characteristics of PEEK’s high melting point and high viscosity of the solution, it is difficult to recycle and reuse such materials. In this paper, a certain amount of PEEK resin powder is added to improve the hot pressing technology of the chopped prepreg. Through a simulated seawater corrosion experiment, the influence of simulated seawater corrosion on the microstructure and mechanical properties of the composite materials is studied. Combined with the principal component analysis method, the corrosion resistance of the chopped CF /PEEK composite was evaluated comprehensively, which provided a reference for the recycling of thermoplastic prepreg and thermoplastic composite products. The results show that the surface quality and mechanical properties of the composites with resin powder are obviously improved. The resin matrix on the surface of the sample was subjected to salt corrosion by chloride ions in a simulated seawater solution to form local corrosion, resulting in pores, cracks, and other defects. The longer the corrosion time of simulated seawater is, the more serious the surface damage of the composite material is, and the more obviously the mechanical property declines. Principal component analysis showed that the resin content had little effect on the seawater corrosion resistance of chopped CF/PEEK composite.

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Yang, Yisha, Duxin Li, Gaojie Si, Qilong Liu und Yue Chen. „Improved thermal and mechanical properties of carbon fiber filled polyamide 46 composites“. Journal of Polymer Engineering 37, Nr. 4 (01.05.2017): 345–53. http://dx.doi.org/10.1515/polyeng-2016-0092.

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Abstract The thermal and mechanical properties of polyamide 46 (PA46) filled with carbon fiber (CF/PA46) composites were studied. CF/PA46 was fabricated by the method of melt blending and injection molding. The results showed that thermal conductivity, tensile strength and impact strength of the composite increased with the increase of weight fraction of CF, however, the elongation at the break decreased as its weight fraction increased. The addition of CF had little effect on the melting temperature of composites, while the crystallization onset (To) and crystallization peak (Tp) temperatures of composites shifted to higher points. The scanning electron microscope images showed that when the weight fraction of CF was increased, the CF was more likely to form thermal chains and a network. When the CF weight fraction was 40%, thermal conductivity was 1.49 W/(m·K), approximately 5.54 times as high as that of the pure PA46, and the thermal diffusivity was 0.9755 mm2/s, 6.5 times higher than that of the pure matrix. Comparing the experimental data with the three expected thermal conduction models data, the Maxwell-Eucken thermal conduction model was considered more suitable for the PA46/CF composite, in which the weight fraction of the filler was <10% in the thermal conductive system.

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Lin, Hong-Ming, C. H. Liu und R. F. Lee. „Effects of high pressure on the crystallization of carbon fiber reinforced polyetheretherketone (CF/PEEK) laminate composites“. Proceedings, annual meeting, Electron Microscopy Society of America 48, Nr. 4 (August 1990): 876–77. http://dx.doi.org/10.1017/s0424820100177519.

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Polyetheretherketone (PEEK) is a crystallizable thermoplastic used as composite matrix materials in application which requires high yield stress, high toughness, long term high temperature service, and resistance to solvent and radiation. There have been several reports on the crystallization behavior of neat PEEK and of CF/PEEK composite. Other reports discussed the effects of crystallization on the mechanical properties of PEEK and CF/PEEK composites. However, these reports were all concerned with the crystallization or melting processes at or close to atmospheric pressure. Thus, the effects of high pressure on the crystallization of CF/PEEK will be examined in this study.The continuous carbon fiber reinforced PEEK (CF/PEEK) laminate composite with 68 wt.% of fibers was obtained from Imperial Chemical Industry (ICI). For the high pressure experiments, HIP was used to keep these samples under 1000, 1500 or 2000 atm. Then the samples were slowly cooled from 420 °C to 60 °C in the cooling rate about 1 - 2 degree per minute to induce high pressure crystallization. After the high pressure treatment, the samples were scanned in regular DSC to study the crystallinity and the melting temperature. Following the regular polishing, etching, and gold coating of the sample surface, the scanning electron microscope (SEM) was used to image the microstructure of the crystals. Also the samples about 25mmx5mmx3mm were prepared for the 3-point bending tests.

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RISTESKA, Svetlana, Anka T. PETKOSKA, Samoil SAMAK und Marian DRIENOVSKY. „Annealing Effects on the Crystallinity of Carbon Fiber-Reinforced Polyetheretherketone and Polyohenylene Laminate Composites Manufactured by Laser Automatic Tape Placement“. Materials Science 26, Nr. 3 (27.02.2020): 308–16. http://dx.doi.org/10.5755/j01.ms.26.3.21489.

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In situ consolidation of thermoplastic composites by Automated Tape Placement (ATP) is challenging. High quality ATP grade pre-preg material and tape head equipped with an efﬁcient heat sources like lasers offer an opportunity towards high deposition rates and improved mechanical properties of composite materials. In this study uni-directional carbon fiber/ polyphenylene sulfide (UD tape prepreg CF/PPS), carbon fiber/polyetheretherketone (UD tape prepreg CF/PEEK) as well as blend of carbon fiber/polyetheretherketone/polyphenylene sulfide (UD tapes prepregs CF/PEEK/PPS) laminates are compared in terms of their properties after beeing processed by ATP technology. CF/PPS, CF/PEEK and blend CF/PPS/PEEK laminate specimens were processed using in-situ laser-assisted ATP (LATP) process. LATP processing parameters used in this study were chosen based on a preliminary trials; the results provide a basis for reﬁnement of these parameters and prepreg material with an optimal and balanced set of final mechanical properties. This study showed an attempt how to manage the processing parameters for LATP process and to obtain composite materials with tailored properties. The process for production of thermoplastic plates with LATP head in general is a process that is governed by many parameters such as: laser power, angle of incidence, roller pressure and temperature, placement speed, tool temperature, then types of the roller material and the tool material. These parameters are not subject of discussing in this paper; they are kept constant, and the goal of the paper is to manage the crystallinity level within the composite thermoplastic material during annealing step at different temperatures after LATP process. Also, the void content during the production process could be controlled. More particularly, the authors showed that composites based on PPS matrix manufactured with LATP process possess higher flexural strength, with less void content compared to samples based on PEEK matrix. These samples showed also higher crystallinity after annealing step.

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Johansson, Pontus, Pär Marklund, Marcus Björling und Yijun Shi. „Effect of Oxygen and Moisture on the Friction and Wear of Carbon Fiber-Reinforced Polymers“. Lubricants 11, Nr. 9 (20.09.2023): 412. http://dx.doi.org/10.3390/lubricants11090412.

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Carbon fiber-reinforced polytetrafluoroethylene (CF/PTFE) composites are frequently used in tribological dry gas applications, such as in dynamic seals in reciprocating hydrogen gas compressors and Stirling engines, due to their superior friction and wear. Due to the increasing concerns regarding fluoropolymers as possible pollutants of harmful per- and poly-fluoroalkyl substances (PFAS) emissions, replacements for PTFE should be investigated. The literature indicates that CF-reinforced polyetheretherketone (CF/PEEK) may have similar favorable tribological properties to CF/PTFE. However, the tribological behavior of CF/PEEK in dry gas is poorly understood, and no direct comparison has been made between the two materials. The aim of this study was to compare the effect of oxygen and moisture on the friction and wear of CF/PTFE and CF/PEEK. Tribological tests were carried out with a tri-pin-on-disc tribometer in a nitrogen environment with individually controlled contents of oxygen and moisture. The results showed that the effect of oxygen and moisture are distinctly different for CF/PTFE and CF/PEEK. While CF/PTFE performs best in oxygen-deficient environments, CF/PEEK performs best in moisture-enriched environments. Complementary tests with a PTFE composite filled with both CF and PEEK suggested that the environmental sensitivity can be significantly reduced by combining the two polymers.

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Lu, Qiu, Lu, Wang, Xiao, Zheng, Wang und Zhang. „Enhancing the Interfacial Strength of Carbon Fiber/Poly(ether ether ketone) Hybrid Composites by Plasma Treatments“. Polymers 11, Nr. 5 (28.04.2019): 753. http://dx.doi.org/10.3390/polym11050753.

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As a promising alternative to traditional prepreg, carbon fiber/poly(ether ether ketone) (CF/PEEK) hybrid composites have attracted wide public interest for their flexibility and conformability. However, modification methods focused on the hybrid premix have not been previously studied. In the present work, the interfacial strength of the hybrid composite was improved by treating the carbon and PEEK fibers together in a radiofrequency (RF) plasma containing one of the following gases to achieve surface activation: air, Ar, or Ar–air. After plasma treatment, the increased roughness of CF and the grafted chemical groups of CFs and PEEK fibers were propitious to the mechanical interlocking and interfacial strength. Significant interfacial shear strength (IFSS) enhancement was achieved after Ar 1 min, air 1 min plasma treatment. This study offers an alternative method for improving the interfacial properties of CF/PEEK composites by focusing on the boundary layer and modifying and controlling the fiber–matrix interface.

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Luo, Honglin, Dehui Ji, Guangyao Xiong, Lingling Xiong, Chuanyin Zhang, Yong Zhu und Yizao Wan. „Effect of Sisal Fibre Hybridisation on Static and Dynamic Mechanical Properties of Corn/Sisal/Polylactide Composites“. Polymers and Polymer Composites 25, Nr. 6 (Juli 2017): 463–70. http://dx.doi.org/10.1177/096739111702500605.

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The relatively poor mechanical properties of corn fibre (CF) and its green composites have hindered its applications. In this work, sisal fibre (SF) was hybridised with CF to reinforce polylactide (PLA) composites (CF/SF/PLA). The static mechanical properties such as tensile, flexural and impact strengths and dynamic mechanical properties such as storage modulus (E’), damping behaviour (tan δ), glass transition temperature (Tg) of the hybrid composites were determined and, for the first time, hybrid effects on both static and dynamic mechanical properties were evaluated. It is found that the tensile, flexural, impact strengths, and E’ and tan δ peak height, as well as the hybrid effects change with hybrid ratio (SF:CF). It is demonstrated that a hybrid composite with desirable static and dynamic mechanical properties can be produced by optimising the fibre:hybrid ratio.

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Liu, Haibao, Jun Liu, Yuzhe Ding, Jie Zheng, Xiangshao Kong, Jin Zhou, Lee Harper, Bamber R. K. Blackman, Anthony J. Kinloch und John P. Dear. „The behaviour of thermoplastic and thermoset carbon fibre composites subjected to low-velocity and high-velocity impact“. Journal of Materials Science 55, Nr. 33 (01.09.2020): 15741–68. http://dx.doi.org/10.1007/s10853-020-05133-0.

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Abstract The present paper describes the results from experimental and theoretical modelling studies on the behaviour of continuous carbon fibre/polymer matrix composites subjected to a relatively low-velocity or high-velocity impact, using a rigid, metallic impactor. Drop-weight and gas-gun tests are employed to conduct the low-velocity and high-velocity impact experiments, respectively. The carbon fibre composites are based upon a thermoplastic poly(ether–ether ketone) matrix (termed CF/PEEK) or a thermoset toughened epoxy matrix (termed CF/Epoxy), which has the same fibre architecture of a cross-ply [03/903]2s lay-up. The studies clearly reveal that the CF/PEEK composites exhibit the better impact performance. Also, at the same impact energy of 10.5 ± 0.3 J, the relatively high-velocity test at 54.4 ± 1.0 m s−1 leads to more damage in both types of composite than observed from the low-velocity test where the impactor struck the composites at 2.56 m s−1. The computationally efficient, two-dimensional, elastic, finite element model that has been developed is generally successful in capturing the essential details of the impact test and the impact damage in the composites, and has been used to predict the loading response of the composites under impact loading.

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Ye, L., K. Friedrich und D. Cutolo. „Effects of Bundle geometry of Fit® Material Pre-Forms on Consolidation process of Thermoplastic Composites“. Advanced Composites Letters 1, Nr. 6 (November 1992): 096369359200100. http://dx.doi.org/10.1177/096369359200100602.

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Effects of variations in bundle geometry on consolidation behavior of FIT® material pre-forms are discussed. The results for CF/PEEK composites indicate that increasing in the shape-ratio of the FIT® material is one way to improve the impregnation process and consolidation quality in manufacturing thermoplastic composite parts.

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Sun, Bin, Suhail Mubarak, Guocun Zhang, Kangming Peng, Xueling Hu, Qia Zhang, Lixin Wu und Jianlei Wang. „Fused-Deposition Modeling 3D Printing of Short-Cut Carbon-Fiber-Reinforced PA6 Composites for Strengthening, Toughening, and Light Weighting“. Polymers 15, Nr. 18 (11.09.2023): 3722. http://dx.doi.org/10.3390/polym15183722.

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Additive manufacturing of carbon-fiber-reinforced polymer (CFRP) has been widely used in many fields. However, issues such as inconsistent fiber orientation distribution and void formation during the layer stacking process have hindered the further optimization of the composite material’s performance. This study aimed to address these challenges by conducting a comprehensive investigation into the influence of carbon fiber content and printing parameters on the micro-morphology, thermal properties, and mechanical properties of PA6-CF composites. Additionally, a heat treatment process was proposed to enhance the interlayer bonding and tensile properties of the printed composites in the printing direction. The experimental results demonstrate that the PA6-CF25 composite achieved the highest tensile strength of 163 MPa under optimal heat treatment conditions: 120 °C for 7.5 h. This corresponds to a significant tensile strength enhancement of 406% compared to the unreinforced composites, which represents the highest reported improvement in the current field of CFRP-fused deposition 3D printing. Additionally, we have innovatively developed a single-layer monofilament CF-OD model to quantitatively analyze the influence of fiber orientation distribution on the properties of the composite material. Under specific heat treatment conditions, the sample exhibits an average orientation angle μ of 0.43 and an orientation angle variance of 8.02. The peak frequency of fiber orientation closely aligns with 0°, which corresponds to the printing direction. Finally, the study explored the lightweight applications of the composite material, showcasing the impressive specific energy absorption (SEA) value of 17,800 J/kg when implementing 3D-printed PA6-CF composites as fillers in automobile crash boxes.

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Zhang, Xifang, Zhenqiang Yao, Haifeng Du, Jiacheng Song, Zhiyi Jin und Wei Xu. „Wettability and Frictional Studies of PEEK Composites against Co-Cr Alloys with Surface Textures“. Polymers 15, Nr. 19 (06.10.2023): 4006. http://dx.doi.org/10.3390/polym15194006.

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With the aim of promoting the qualities for total hip joint replacement, the wettability and tribological behaviors of PEEK composites pins with two sets of different fillers (PEEK/CF or PEEK/CF/PTFE/graphite) against Co-Cr alloy discs with five categories of surface textures (polished, orthogonal, spiral, r-θ, and orthogonal combined with spiral) were explored. It is revealed that the existence of CF in PEEK matrix increases the hydrophilicity in addition to the strength of PEEK, while the addition of PTFE increases the hydrophobicity of PEEK. The Co-Cr alloy discs with hydrophilic properties can be adjusted as hydrophobic, with the depth of textured grooves exceeding the critical sag height determined by the contact angle and the groove width. It can be concluded that PEEK/CF/PTFE/graphite composite has a lower wear rate than PEEK only reinforced with CF against Co-Cr alloy, both without surface texture and with shallow or deep grooves. The existence of shallow grooves on the disc surface could help the PEEK blends to achieve a steady friction against Co-Cr alloy in addition to collecting the worn debris. PEEK blend pins with 10 vol% CF, 10 vol% PTFE and 10 vol% graphite can achieve a lower friction coefficient of no more than 0.2 against Co-Cr alloy discs with shallow grooves around 3.5 μm in orthogonal or spiral textures.

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Yu, Yuan Hao, Gai Zhao, Jing Fu Song und Qing Jun Ding. „Mechanical and Tribological Properties of Polyimide Composites for Reducing Weight of Ultrasonic Motors“. Key Engineering Materials 799 (April 2019): 65–70. http://dx.doi.org/10.4028/www.scientific.net/kem.799.65.

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The travelling waves ultrasonic motors (TWUM) with nonmagnetic, large torque, high precision and simple structure was driven by frictional force, which had been applied aerospace, intelligent and precise instruments. In order to reduce the total weight of TWUM, the phosphor bronze stator with the biggest density among the all parts of TWUM (8.89 g/cm3) were substituted with light weight polymer or polymer composites. This study designed and prepared one types of low density polyimide (PI) composite (1.41g/cm3) reinforced with carbon fibers (CF) which can reduce the weight of stator over 85%. Importantly, this PI composite can meet the main requirements of TWUM, such as high elastic modulus, wear resistance, and suitable friction coefficient. The output stalling torque of TWUM with CF/PI stator still have 0.22 N·m (18.3% compared with TWUM with phosphor bronze stator). Moreover, this study systematically investigated the mechanical and tribological properties of CF/PI composite. For comparison, the pure PI, polyetheretherketone (PEEK) and polyphenylene sulfide (PPS) were also analyzed to reveal the wear mechanisms. The experimental results indicated that CF/PI had better wear resistance and lower friction coefficient than other polymer sliding against Si3N4. This light weight polymer composites would be an ideal candidate to reduce the weight of TWUM, which can broaden the lightweight application in the field of aerospace.

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Jeon, In Sung, Moon Hyun Lee, Han-Hyeong Choi, Sangwoon Lee, Joon Woo Chon, Dong June Chung, Jong Hyuk Park und Jae Young Jho. „Mechanical Properties and Bioactivity of Polyetheretherketone/Hydroxyapatite/Carbon Fiber Composite Prepared by the Mechanofusion Process“. Polymers 13, Nr. 12 (16.06.2021): 1978. http://dx.doi.org/10.3390/polym13121978.

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The main obstacles in the melt-processing of hydroxyapatite (HA) and carbon fiber (CF) reinforced polyetheretherketone (PEEK) composite are the high melting temperature of PEEK, poor dispersion of HA nanofillers, and poor processability due to high filler content. In this study, we prepared PEEK/HA/CF ternary composite using two different non-melt blending methods; suspension blending (SUS) in ethanol and mechanofusion process (MF) in dry condition. We compared the mechanical properties and bioactivity of the composite in a spinal cage application in the orthopedic field. Results showed that the PEEK/HA/CF composite made by the MF method exhibited higher flexural and compressive strengths than the composite prepared by the SUS method due to the enhanced dispersibility of HA nanofiller. On the basis of in vitro cell compatibility and cell attachment tests, PEEK/HA/CF composite by mechanofusion process showed an improvement in in vitro bioactivity and osteo-compatibility.

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Dai, Guangming, Lihua Zhan, Chenglong Guan und Minghui Huang. „Optimization of molding process parameters for CF/PEEK composites based on Taguchi method“. Composites and Advanced Materials 30 (01.01.2021): 263498332110018. http://dx.doi.org/10.1177/26349833211001882.

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In this article, nine groups of laminates were prepared according to the Taguchi L9(33) test array to study the influence of three process parameters, including molding pressure, molding temperature, and holding time on the performance of unidirectional carbon fiber/polyetheretherketone (CF/PEEK) laminates. A differential scanning calorimetry test was employed to select a reasonable process parameters range. The transverse tensile strength of the laminates was measured, and the fiber–matrix interfacial bonding behavior of the tested samples was analyzed by scanning electron microscopy. The results showed that the significance of factors to transverse tensile strength were molding temperature, holding time, and molding pressure in sequence. The optimal molding process parameters for CF/PEEK composite laminate were molding temperature of 400°C, molding pressure of 3 MPa, and holding time of 30 min. The optimization results were meaningful for the extension and application of thermoplastic composites.

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Kosson, M., L. Brown und F. Sanchez. „Early-Age Performance of 3D Printed Carbon Nanofiber and Carbon Microfiber Cement Composites“. Transportation Research Record: Journal of the Transportation Research Board 2674, Nr. 2 (29.01.2020): 10–20. http://dx.doi.org/10.1177/0361198120902704.

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3D printed cement composites with and without carbon nanofiber (CNF) and microfiber (CF) reinforcement within the cement ink were evaluated at seven days and compared with their traditionally cast counterparts. A liquid lubrication layer at the extrusion nozzle was noted. The reinforcement type influenced the formation of the extruded filament, with underextrusion seen during 3D printing with the CNF cement ink while sudden discontinuation of extrusion was experienced during 3D printing with the CF cement ink. No noticeable interfacial region between printed filaments was observed in the 3D printed cement composites, with the exception of air cavities between printed filaments of the composite fabricated with the CNF cement ink. Lower compressive strengths were seen in the direction orthogonal to the print path for the 3D printed composites compared with the cast composites. The addition of CFs within the cement ink reduced this strength difference and led to strain softening in the post peak behavior.

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Qin, Yan, Shi Wei Zhao, Bi Fang Dai, Qi Lin Mei und Zhi Xiong Huang. „Studies on Properties of Epoxy Resin Base Piezoelectricity Damping Carbon Fiber Composite Materials“. Key Engineering Materials 508 (März 2012): 271–75. http://dx.doi.org/10.4028/www.scientific.net/kem.508.271.

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Damping Materials Have Been Wildly Used in Aerospace, Traffic, Construction Fields and so on. The Piezo-Damping Materials Have Received much Attention due to the Novel Energy Loss Mechanism. In this Paper, Piezo-Damping Composite Materials Were Prepared from the Epoxy Resin (EP) as the Resin Matrix, Nano Lead Titanate (Nano-PT) Ceramics as Piezoelectric Material and Chopped Carbon Fibers (CF) as Conductive Materials. The Mechanical and Damping Properties of the Composites Were Analyzed by Mechanics Test, DMA and Vibration Beam Method. The Results Showed that when the Nano-PT Content Was 60% of EP and CF Content Was 0.25% of EP, the Composite Got the Better Mechanical Properties. Form DMA, the Loss Factor (tanδ) Peak Reached 0.58. Damping Temperature Range △T (tanδ>0.3) Was about 36.3°C. In Comparison, Damping Loss Factor Measured by Vibration Beam Method Was 0.82.

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WANG, XIAN, JUNYI DAI, TIANQING XING und JINLONG ZHUO. „INFLUENCE OF CARBON FIBER ON THE COMBUSTION BEHAVIOR, THERMAL STABILITY AND MECHANICAL PROPERTIES OF ETHYLENE-VINYL ACETATE COPOLYMER (EVA) AND 9,10-DIHYDRO-9-OXA-10-PHOSPHAPHENANTHRENE-10-OXIDE (DOPO) COMPOSITES“. DYNA 96, Nr. 3 (01.05.2021): 302–8. http://dx.doi.org/10.6036/10031.

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Ethylene-vinyl acetate copolymer (EVA) is widely used due to its good processability, low density, and low temperature resistance. However, it burns easily and has several disadvantages, such as a high heat release rate and melt dripping, and it emits large amounts of smog and toxic harmful gases. These disadvantages greatly limit the application of EVA in the wire and cable field. In this study, a series of carbon fiber (CF)/9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO)/EVA composites are prepared through melt compounding to improve the flame retardancy and mechanical properties of EVA. The flame retardancy, thermal stability, and mechanical properties of the composites are studied through microscale combustion calorimeter experiments, cone calorimeter tests, thermogravimetric analysis, digital camera, and tensile measurements. Results indicate that among the six samples, the EVA-5 composite with 4.0 wt% CF, 16.0 wt% DOPO, and 80 wt% EVA has the highest limiting oxygen index value (25.1%) and reaches the V-1 level of the Underwriters Laboratory-94 test. Compare with that of pure EVA, the peak heat release rate of the EVA-5 composite has reduced by 30.2% and 47.7%. In addition, the total heat release of EVA-5 reduces by 17.0% and 34.8% relative to that of pure EVA. Data of thermogravimetric analysis show that the thermal stability of CF/DOPO/EVA improves with the increase in CF loading. Moreover, the tensile strength and elongation-at-break values of EVA-5 are 14.30 MPa and 1142.87%, respectively, indicating that this material can maintain good mechanical properties. CF not only enhances the tensile properties of EVA but also acts as a skeleton during burning. This action could increase the strength of the carbon layer and enhance the flame-retardant effect of DOPO. CF and DOPO have an enhanced synergistic effect that could improve the flame retardancy, thermal stability, and mechanical properties of EVA composites. This work provides a theoretical basis for the preparation and production of CF/DOPO/EVA composites with good comprehensive performance. Keywords: thylene-vinyl acetate copolymer; 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide; carbon fiber; flame retardant; synergistic effects

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Lin Ye und Klaus Friedrich. „Processing of CF/PEEK thermoplastic composites from flexible preforms“. Advanced Composite Materials 6, Nr. 2 (Januar 1997): 83–97. http://dx.doi.org/10.1163/156855197x00012.

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Hassan, Elwathig A. M., Dengteng Ge, Shu Zhu, Lili Yang, Jianfeng Zhou und Muhuo Yu. „Enhancing CF/PEEK composites by CF decoration with polyimide and loosely-packed CNT arrays“. Composites Part A: Applied Science and Manufacturing 127 (Dezember 2019): 105613. http://dx.doi.org/10.1016/j.compositesa.2019.105613.

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Choi, Bo-Kyung, Chang-Soo Kang, Myeong-Han Yoo und Min-Kang Seo. „Effect of Processing Parameters on Bonding Performance of a Carbon Fiber/Polyetheretherketone Thermoplastic Composite Prepared by Induction Welding“. Materials 16, Nr. 11 (25.05.2023): 3954. http://dx.doi.org/10.3390/ma16113954.

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Among the various welding techniques used to bond thermoplastic composites, induction welding stands out as a fast, clean, and contact-free process that shortens the welding time and prevents the weight increase of mechanical fastening, such as rivets and bolts. In this study, we manufactured polyetheretherketone (PEEK)-resin-based thermoplastic carbon fiber (CF) composite materials at different automated fiber placement laser powers (3569, 4576, and 5034 W) and investigated their bonding and mechanical characteristics after induction welding. The quality of the composite was evaluating using various techniques, including optical microscopy, C-scanning, and mechanical strength measurements, and a thermal imaging camera was used to monitor the surface temperature of the specimen during its processing. The results revealed that the preparation conditions of the polymer/carbon fiber composites, such as the laser power and surface temperature, significantly affect the quality and performance of the induction-welding-bonded composites. A lower laser power during preparation resulted in weaker bonding between components of the composite and yielded samples with a lower shear stress.

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Lyu, Li-Hua, Wen-Di Liu und Bao-Zhong Sun. „Electromagnetic Wave-Absorbing and Bending Properties of Three-Dimensional Honeycomb Woven Composites“. Polymers 13, Nr. 9 (05.05.2021): 1485. http://dx.doi.org/10.3390/polym13091485.

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To avoid the delamination of the traditional three-dimensional (3-D) honeycomb electromagnetic (EM) absorbing composites and improving the defects of low mechanical properties, the 3-D honeycomb woven fabrics were woven on the ordinary loom by practical design. The fabrication of 3-D honeycomb woven EM absorbing composites was based on carbon black/carbonyl iron powder/basalt fiber/carbon fiber/epoxy resin (CB/CIP/BF/CF/EP) by the vacuum-assisted resin transfer molding (VARTM) process. A CB/CIP composite absorbent study showed that CB/CIP composite absorbent belongs to a magnetic loss type absorbent. Adding CB/CIP significantly improved the absorption performance of composite, increased the absorption peak and the effective absorption bandwidth (EAB), but the bending performance decreased. The normalization analysis results showed that when the thickness was 15 mm, the mechanical properties and EM wave-absorbing properties of the 3-D honeycomb woven composite were the best matches. The morphological characteristics and displacement load curves of the composite after fracture were analyzed. The bending failure modes were brittle fracture of the fiber bundle, matrix cracking, and typical shear failure. Despite the above failure mechanism, the 3-D honeycomb woven EM absorbing composites still has good integrity without delamination.

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Al-Mazrouei, Noura, Ali H. Al-Marzouqi und Waleed Ahmed. „Characterization and Sustainability Potential of Recycling 3D-Printed Nylon Composite Wastes“. Sustainability 14, Nr. 17 (23.08.2022): 10458. http://dx.doi.org/10.3390/su141710458.

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The revolution of 3D-printing technology has caused an additional source of plastic waste, especially the new generation of composite filaments that are linked with the commercial fused deposition modeling process, adding pressure to find a sustainable solution to tackle the emerging waste problem. This study aims to investigate the mechanical and thermal properties of a blended recycled composite material produced by mixing two different 3D-printed reinforced composite wastes, carbon fiber CF/nylon, and glass fiber GF/nylon filaments that were mixed at different percentages using a hot extrusion procedure, tested by a tensile testing machine, and processed with five different weight ratios to study the impact of blend ratios on the material characteristics of the recycled composites and to find the optimum weight ratios with the most preferred properties. The results revealed that the maximum tensile strength of the GF/nylon composite was achieved with 60 wt%. The highest elastic modulus value was recorded at 60 wt% GF/nylon. Moreover, it was noted that at 80 wt% of GF/nylon, the ductility is at the peak value among the composites.

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Lu, Chunrui, Nuo Xu, Ting Zheng, Xin Zhang, Hanxiong Lv, Xue Lu, Lin Xiao und Dongxing Zhang. „The Optimization of Process Parameters and Characterization of High-Performance CF/PEEK Composites Prepared by Flexible CF/PEEK Plain Weave Fabrics“. Polymers 11, Nr. 1 (31.12.2018): 53. http://dx.doi.org/10.3390/polym11010053.

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Continuous carbon fiber (CF)-reinforced poly (ether ether ketone) (PEEK) composites have excellent mechanical properties, but their processing techniques are limited. Therefore, we promoted a braiding method based on the hybrid fiber method by hot-compacting CF/PEEK plain weave fabrics to solve the problem of difficult wetting between CF and PEEK. Four parameters—melting temperature, molding pressure, crystallization temperature and the resin contents—were investigated for optimized fabrication. After studying the melting range, thermal stability and the contact angle of PEEK under different temperatures, the melting temperature was set at 370 °C. An ultra-depth-of-field 3D microscope was adopted to investigate the effects of molding pressure in the melting stage. The tensile strength or modulus along and perpendicular to the carbon fiber direction and crystallinity under different crystallization temperatures were analyzed. As a result, the sample crystalized at 300 °C showed an excellent tensile properties and crystallinity. The increased mass ratio of PEEK ranging from 50.45% to 59.07% allowed for much stronger interfacial strength; however, the higher resin content can lead to the dispersion of CFs, loss of resin and the formation of defects during processing. Finally, the optimal resin mass content was 59.07%, with a tensile strength of 738.36 ± 14.49 MPa and a flexural strength of 659.68 ± 57.53 MPa. This paper studied the optimized processing parameters to obtain better properties from CF/PEEK plain weave fabrics and to further broaden the specific applications of CF/PEEK composites, demonstrating a new direction for its fabrication.

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Hache, Florian, Michael Delichatsios, Talal Fateh und Jianping Zhang. „Comparison of methods for thermal analysis: Application to PEEK and a composite PEEK+CF“. Journal of Fire Sciences 33, Nr. 3 (Mai 2015): 232–46. http://dx.doi.org/10.1177/0734904115584154.

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Jiang, Houfeng, Ru Jia, Wurikaixi Aiyiti, Patiguli Aihemaiti und Ayiguli Kasimu. „Infill strategies for 3D-printed CF-PEEK/HA-PEEK honeycomb core-shell composite structures“. Journal of Manufacturing Processes 92 (April 2023): 338–49. http://dx.doi.org/10.1016/j.jmapro.2023.02.058.

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Ning, Li, Chen Deqiang, Gao Xiyan, Lu Lirong und Chen Weizeng. „Biological tribology properties of the modified polyether ether ketone composite materials“. REVIEWS ON ADVANCED MATERIALS SCIENCE 59, Nr. 1 (19.09.2020): 399–405. http://dx.doi.org/10.1515/rams-2020-0034.

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AbstractModification of poly-ether-ether-ketone (PEEK) to adapt to the biological properties of materials is currently the key point in the research of medical materials. The tribological properties and biocompatibility of the PEEK composites modified by carbon fiber (CF), potassium titanate whisker(PTW) and nano-particles were discussed in this paper. The results show the modified PEEK composites by a certain length to diameter ratio of CF show the best using effect in vivo experiments in good blood compatibility, which is suitable for orthopaedic implant materials. A large number of experiments show that the PEEK composites would be modified with a certain ratio of CF (about 30%wt.), whisker (about 15%wt.) and HA (about 5%wt.) particle with better biological tribological properties, more important value in medical research.

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Song, Meiyun, Xiaoqing Wang, Ran Du, Zhen Zhou, Xiaomeng Li, Guoping Li und Yunjun Luo. „Effects of liquid crystal polymer (LCP) on the structure and performance of PEEK/CF composites“. RSC Advances 12, Nr. 20 (2022): 12446–52. http://dx.doi.org/10.1039/d2ra01450e.

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Here a liquid crystal polymer (LCP) was introduced into a PEEK/CF system as a new solution to simultaneously promote processing and mechanical performance of PEEK/CF and other polymer-based composites.

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50

Song, Meiyun, Xiaoqing Wang, Ran Du, Zhen Zhou, Xiaomeng Li, Guoping Li und Yunjun Luo. „Effects of liquid crystal polymer (LCP) on the structure and performance of PEEK/CF composites“. RSC Advances 12, Nr. 20 (2022): 12446–52. http://dx.doi.org/10.1039/d2ra01450e.

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Here a liquid crystal polymer (LCP) was introduced into a PEEK/CF system as a new solution to simultaneously promote processing and mechanical performance of PEEK/CF and other polymer-based composites.

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