High strength carbon-fiber reinforced polyamide 6 composites additively manufactured by screw-based extrusion

Li, Xiping; He, Jia-Wen; Hu, Zhonglue; Ye, Xin; Wang, Sisi; Zhao, Yuan; Wang, Bin; Ou, Yuhui; Zhang, Jiazhen

doi:10.1016/j.compscitech.2022.109707

Cited by 42 publications

(20 citation statements)

References 38 publications

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“…Nonetheless, while the tensile strength of the CCF-PA6 specimen at 150 C only amounts to 50.8% of the room temperature counterpart, it is still among the highest compared with other 3D-printed thermoplastics reinforced by short fibers. 3,33 At 100 C, tensile strength of the printed specimen reached 294.1 MPa, which is comparable to the strength of 6061-T6 aluminum alloy at room temperature (310 MPa). 36 It is also worth noticing that, the mechanical performance of the 3D-printed CCF-PA6 specimens at elevated temperatures can be further improved by fine-tuning the printing parameters, such reducing the layer thickness and hatch spacing.…”

Section: Mechanical Properties Of the 3dprinted Ccf-pa6mentioning

confidence: 57%

“…To evaluate the porosity of the 3D‐printed specimens, the density and weight of each specimen was measured with a high‐precision scale. The porosity of the 3D‐printed CCF‐PA6 specimens can be determined by Equations () and() 33 :

P = \frac{V_{a} - V_{t}}{V_{a}},

V_{t} = \frac{M \times m_{f}}{ρ_{f}} + \frac{M \times m_{m}}{ρ_{m}},

where V a and V t stand for the actual volume and theoretical volume of the 3D‐printed specimen. The actual volume can be directly measured; whereas the theoretical volume can be calculated by summing the volumes of CF and PA matrix (Equation ()), where M stands for the weight of the printed specimens, and

m_{f}

ρ_{f}

m_{m}

, and

ρ_{m}

are the mass fraction and density of the fiber and PA6 resin, respectively.…”

Section: Resultsmentioning

confidence: 99%

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Additive manufacturing of high‐strength polyamide 6 composites reinforced with continuous carbon fiber prepreg

Chen,

Hu,

et al. 2023

Polymer Composites

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The additive manufacturing of continuous fiber reinforced thermoplastics (CFRTPs) paves way for the high‐strength, light‐weight components for variety of load‐bearing applications. In this work, the continuous carbon fiber reinforced PA6 (CCF‐PA6) composites was successfully printed from the prepreg filament. The prepreg filament was prepared in‐house by impregnating the heat‐and‐acid treated 1 K carbon fiber bundle with the molten PA6. The tensile strength of the prepreg filament, which contained with 40 vol% CF, reached 984 MPa. The unidirectional CCF‐PA6 specimens were subsequently 3D‐printed with the prepreg filament, and the mechanical strength of those 3D‐printed specimens were tunable by adjusting a set of printing parameters, such as layer thickness, hatch spacing and printing temperatures. The highest tensile strength of the specimen reached 555 MPa. Those specimens also exhibited outstanding mechanical strength at elevated temperatures, still reaching 184 MPa at 150°C. The mechanical strength of those specimens was dependent on the content of the fiber. This study can hopefully provide new insights for feedstock design and spur novel ideas in tailoring the mechanical properties of the 3D‐printed CFRTPs.

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Section: Mechanical Properties Of the 3dprinted Ccf-pa6mentioning

confidence: 57%

P = \frac{V_{a} - V_{t}}{V_{a}},

V_{t} = \frac{M \times m_{f}}{ρ_{f}} + \frac{M \times m_{m}}{ρ_{m}},

m_{f}

ρ_{f}

m_{m}

, and

ρ_{m}

are the mass fraction and density of the fiber and PA6 resin, respectively.…”

Section: Resultsmentioning

confidence: 99%

Additive manufacturing of high‐strength polyamide 6 composites reinforced with continuous carbon fiber prepreg

Chen,

Hu,

et al. 2023

Polymer Composites

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“…In recent years, extrusion-injection molding technology of carbon-fiber-reinforced polymer composites has become the focus of research interest due to its advantages of low cost and flexible design [ 13 , 14 , 15 , 16 , 17 ]. Martin et al [ 18 ] prepared oriented chopped carbon-fiber-reinforced polypropylene composites with anisotropic mechanical properties and thermal conductivity using extrusion additive manufacturing.…”

Section: Introductionmentioning

confidence: 99%

Eco-Friendly Preparation of Carbon-Bonded Carbon Fiber Based on Glucose-Polyacrylamide Hydrogel Derived Carbon as Binder

Zeng

Xie

et al. 2023

Nanomaterials

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Lightweight, high-temperature-resistant carbon-bonded carbon fiber (CBCF) composites with excellent thermal insulation properties are desirable materials for thermal protection systems in military and aerospace applications. Here, glucose was introduced into the polyacrylamide hydrogel to form the glucose-polyacrylamide (Glu-PAM) hydrogel. The CBCF composites were prepared using the Glu-PAM hydrogel as a brand-new binder, and the synergistic effect between glucose and acrylamide was investigated. The results showed the Glu-PAM hydrogel could limit the foaming of glucose and enhance the carbon yield of glucose. Meanwhile, the dopamine-modified chopped carbon fiber could be uniformly mixed by high-speed shearing to form a slurry with the Glu-PAM hydrogel. Finally, the slurry was successfully extruded and molded to prepare CBCF composites with a density of 0.158~0.390 g cm−3 and excellent thermal insulation performance and good mechanical properties. The compressive strength of CBCF composites with a density of 0.158 g cm−3 in the Z direction is 0.18 MPa, and the thermal conductivity in the Z direction at 25 °C and 1200 °C is 0.10 W m−1 k−1 and 0.20 W m−1 k−1, respectively. This study provided an efficient, environment-friendly, and cost-effective strategy for the preparation of CBCF composites.

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“…The introduction of carbon fiber (CF) into polymer matrices is a widely used approach to improve the mechanical and wear properties [6][7][8]. While the approach is effective and convenient, excessive amounts of CF can lead to high viscosity during processing, resulting in several issues such as poor dispersion, incomplete interfacial compatibility, and unreliable product stability.…”

Section: Introductionmentioning

confidence: 99%

“…These issues ultimately hamper the overall performance [9,10]. Li et al [8] found that internal defects in CF/PA6 composites were responsible for decreased tensile strength. The concentration of 35 wt.% CF hindered the flow of the polymer matrix, causing increased porosity and inadequate impregnation.…”

Section: Introductionmentioning

confidence: 99%

Tribological and Mechanical Applications of Liquid-Crystal-Polymer-Modified Carbon-Fiber-Reinforced Polyamide–Polyurethane Composites

Zhou

Wang

et al. 2023

Polymers

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An aromatic copolyester liquid crystal polymer (LCP) was introduced into carbon-fiber-reinforced polyamide–polyurethane (CF/PA-PU) composites through melt blending to improve the tribological properties of the composites. The effects of LCP on the mechanical, processing, and thermal properties of CF/PA-PU composites were compared to those of commonly-used graphite (Gr). The results showed that at 5 wt.% LCP content, the coefficient of friction (COF) was decreased by 16.06%, and the wear rate by 32.22% in the LCP/CF/PA-PU composite compared to the CF/PA-PU composite. Furthermore, using LCP instead of Gr showed significantly improved mechanical properties and reduced processing viscosity. The tensile strength of 5%LCP/CF/PA-PU composite could reach 99.08 MPa, while the equilibrium torque was reduced, being 26.85% higher and 18.37% lower than those of CF/PA-PU composite, respectively. The thermal stability of LCP/CF/PA-PU composites was also enhanced. The addition of 5 wt.% LCP to CF/PA-PU composite increased the initial decomposition temperature by 14.19% compared to CF/PA-PU. In sharp contrast, the addition of Gr increased equilibrium torque and actual processing temperature leading to processing difficulties and instability. This approach offers a novel strategy for tribological applications and tackles the problem of high viscosity in CF/PA-PU composites.

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High strength carbon-fiber reinforced polyamide 6 composites additively manufactured by screw-based extrusion

Cited by 42 publications

References 38 publications

Additive manufacturing of high‐strength polyamide 6 composites reinforced with continuous carbon fiber prepreg

Additive manufacturing of high‐strength polyamide 6 composites reinforced with continuous carbon fiber prepreg

Eco-Friendly Preparation of Carbon-Bonded Carbon Fiber Based on Glucose-Polyacrylamide Hydrogel Derived Carbon as Binder

Tribological and Mechanical Applications of Liquid-Crystal-Polymer-Modified Carbon-Fiber-Reinforced Polyamide–Polyurethane Composites

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