Surface state of domestic ZT7H carbon fiber and interface property of composites
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摘要: 目前我国在高性能碳纤维研发生产方面已取得了突破性的进展。本文选用不同批次和牌号的国产ZT7H碳纤维,对其进行去浆和上浆处理,并制备碳纤维增强环氧树脂基复合材料,探究国产H1型上浆剂对ZT7H碳纤维表面形貌和微观界面性能的影响及不同牌号碳纤维复合材料界面性能的差异。研究表明,H1上浆剂增加了碳纤维表面粗糙度和极性组分含量,增强了湿热老化前后复合材料的微观界面力学性能。同时,碳纤维织物的编织方式对其复合材料的静态力学性能和界面性能有很大影响。实验证明,国产ZT7H碳纤维的性能已超过东丽T700碳纤维,但其加工工艺性仍有待提升。Abstract: At present, China has made great breakthrough in the development and production of high-performance carbon fiber. In this paper, different batches and grades of domestic ZT7H carbon fibers were selected and processed for desizing and sizing, and then carbon fiber reinforced epoxy resin composites were prepared. The effect of domestic H1 sizing agent on the surface morphology and micro-interface properties of ZT7H carbon fibers was explored, as well as the differences in interface performance of composites made from different grades of carbon fibers. Studies have shown that H1 sizing agent increases the surface roughness and polar component content of carbon fibers, enhancing the micro-interface mechanical properties of the composite before and after hygrothermal treat. At the same time, the weaving method of carbon fiber fabric has a great influence on the static mechanical properties and interface properties of its composites. Experiments have proved that the performance of domestic ZT7H carbon fiber has exceeded Toray T700 carbon fiber, but its product performance stability still needs to be improved.
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Key words:
- carbon fiber /
- sizing agent /
- composites /
- interface property /
- mechanical property
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表 1 ZT7E/9368和ZT7E3205P/6808碳纤维/环氧树脂复合材料力学性能测试基本参数
Table 1. Basic parameters of mechanical properties test of ZT7E/9368 and ZT7E3205P/6808 carbon fiber/epoxy composite
表 2 ZT7H 碳纤维表面元素成分及含量
Table 2. Element composition and content of ZT7H carbon fiber surface
Carbon
fiberC 1s O 1s N 1s S 2p Si 2p O/C Binding energy/
eVAtom fraction/
at%Binding energy/
eVAtom fraction/
at%Binding energy/
eVAtom fraction/
at%Binding energy/
eVAtom fraction/
at%Binding energy/
eVAtom fraction/
at%Bare fiber 284.8 67.75 532.7 21.27 400.9 3.81 168.6 0.42 102.3 6.75 0.31 H1 sizing 284.8 75.30 532.7 18.84 400.9 2.06 168.6 0.59 102.3 3.22 0.25 表 3 ZT7H碳纤维表面XPS的C1s拟合峰结果
Table 3. C1s fitting peak results of XPS on ZT7H carbon fiber surface
Carbon fiber —C—C— or —C—H— —C—OH— or —C—OR —C= O —COOH or —COOR Binding energy/eV Perssad content/% Binding energy/eV Perssad content/% Binding energy/eV Perssad content/% Binding energy/eV Perssad content/% Bare fiber 284.8 66.92 286.4 29.75 287.8 3.33 — — H1 sizing 284.8 65.87 286.3 32.00 287.0 2.12 — — 表 4 ZT7H碳纤维接触角和表面能组成
Table 4. Contact angle and surface energy composition of ZT7H carbon fiber
Carbon
fiberInfiltrating
perimeter/mmContact angle/(°) Surface
energy/(m·Nm)Polar
component/(m·Nm)Non-polar
component/(m·Nm)Water Diiodomethane Bare fiber 2.50 67.82 44.63 41.58 12.59 28.99 H1 sizing 3.46 68.60 56.21 37.56 15.08 22.48 表 5 ZT7H碳纤维单丝拉伸测试结果
Table 5. Monofilament tensile test results of ZT7H carbon fiber
Carbon
fiberNumber of samples Shape parameter m Tensile strength/MPa Bare fiber 30 4.65 4 122.39 H1 sizing 30 7.09 4 249.17 表 6 自然干态和湿热处理后ZT7H碳纤维复合材料的IFSS及保持率
Table 6. IFSS and retention of ZT7H carbon fiber composites at natural dry state and after hygrothermal treat
Carbon fiber IFSS/MPa Retention rate/% Dry state Hygrothermal treat Bare fiber 23.87 7.02 29.4 H1 sizing 33.09 16.68 50.4 表 7 室温干态和高温干态下ZT7E/9368和ZT7E3205P/6808复合材料的静态力学性能及保持率
Table 7. Static mechanical properties and retention rate of ZT7E/9368 and ZT7E3205P/6808 composites at room temperature and high temperature
Property ZT7E/9368 ZT7E3205P/6808 Room temperature
dry stateHigh temperature
dry stateRetention
rate/%Room temperature
dry stateHigh temperature
dry stateRetention
rate/%0° Compression strength/MPa 950 800 84.21 500 350 70.00 0° Compression modulus/GPa 115 110 95.65 50 40 80.00 90° Tensile strength/MPa 30 25 83.33 600 500 83.33 90° Tensile modulus/GPa 8 7 87.50 60 50 83.33 Flexural strength/MPa 1 500 1 200 80.00 700 600 85.71 Flexural modulus/GPa 115 110 95.65 55 45 81.82 Interlaminar shear strength/MPa 85 60 70.59 55 40 72.73 -
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