| WANG Xian-feng,CAO Zheng-hua,PENG Gong-qiu,ZHANG Bao-yan.Characterization of Different Types Domestic T800 Carbon Fibers and Their Composites[J],52(4):446-457 |
| Characterization of Different Types Domestic T800 Carbon Fibers and Their Composites |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.04.041 |
| KeyWord:carbon fiber spinning process surface properties composites interfacial properties mechanical properties |
| Author | Institution |
| WANG Xian-feng |
AVIC Manufacturing Technology Institute, Beijing , China |
| CAO Zheng-hua |
AVIC Manufacturing Technology Institute, Beijing , China;AVIC Composite Corporation Ltd., Beijing , China |
| PENG Gong-qiu |
AVIC Manufacturing Technology Institute, Beijing , China |
| ZHANG Bao-yan |
AVIC Manufacturing Technology Institute, Beijing , China |
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| Abstract: |
| High strength intermediate modulus carbon fibers composites is one of the most important aviation materials in the world at present. The structure and composition of carbon fiber surface determine the interfacial strength between carbon fiber and resin, which affects the properties of carbon fiber composites. Carbon fibers with different spinning processes have different surface physical and chemical properties, and the properties of their composites are also different. In this study, two kinds of carbon fibers, GW800G by dry-jet wet spinning and CCF800H by wet-jet spinning, were selected. The surface morphology of carbon fibers was characterized by scanning electron microscope (Qusttro S111230) and atomic force microscope (Dimension ICON). X-ray photoelectron spectroscopy (ESCALAB 250) was used to characterize the surface chemical composition of carbon fibers，and the microstructure of carbon fibers were analyzed by X-ray diffractometer (XRD-6000). Then eight 4 mm long monofilament samples were made from the two kinds of carbon fibers, and their contact angles in water and ethylene glycol were measured by dynamic contact angle detector (DAT-25), and the surface energy was calculated. After that, the two carbon fibers were compounded with the same high temperature epoxy resin (BA9918E). The prepregs was cured at 180 ℃, 0.6 MPa for 3 hours through autoclave molding technology. After cutting the carbon fiber composites according to various ASTM testing standards, 0° tensile test, 90° tensile test, 90° flexural test, open hole tensile test, interlaminar shear test and compression after impact test (impact energy:6.67 J/mm) were carried out under the dry condition at room temperature. Then the test samples were soaked in water at (71±5) ℃ for (336±5) hours, and then 90° tensile test, 90° flexural test and interlaminar shear test were carried out at 130 ℃ to further characterize the hygrothermal performance of carbon fiber composites. Finally, scanning electron microscope was used to observe the fracture morphology of the damaged samples in 90° tensile test and 90° flexural test at room temperature. The results indicate that the surface morphology of GW800G carbon fiber is smooth, while the surface roughness of CCF800H carbon fiber is large and the groove is obvious. GW800G carbon fiber and CCF800H carbon fiber have high surface chemical activity and surface energy. The proportion of surface active carbon atoms reaches 34.11% and 33.24% respectively, and the surface energy reaches 36.92 mJ/m2 and 40.08 mJ/m2. There is a small gap between the two levels. At the same time, the graphitic microcrystalline structure of the two carbon fibers is similar, and GW800G carbon fiber has a higher degree of graphitization. These characteristics are consistent with the properties of its composites. The modulus of the two carbon fibers is similar. GW800G/BA9918E composites have higher 0° tensile strength, while other interface related strength and hygrothermal performance reach the level of CCF800H/BA9918E composites. The fracture morphology of 90° tensile and 90° flexural failure specimens of the two composites also reflect that the two carbon fibers have good bonding ability with the resin matrix. It is verified that the surface properties of domestic dry-jet wet spinning carbon fiber and the interface properties of composites have reached the level of wet-jet carbon fiber, while ensuring high strength, and have good comprehensive mechanical properties. |
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