Bonding performance of domestic T800 carbon fiber/high toughness epoxy composite based on surface modification
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摘要: 本文通过打磨、喷砂、等离子处理方法对国产T800碳纤维/高韧性环氧树脂复合材料的待胶接面进行改性，分别制备了J-116B胶膜和J-375胶膜的浮辊剥离性能及拉伸剪切性能试验件。测试了不同处理条件下J-116B胶膜和J-375胶膜的剥离和剪切性能。采用SEM对老化前后、未经刻蚀和刻蚀后的剥离试样形貌进行观察。采用接触角测试仪测试了不同表面处理方法对国产T800碳纤维/高韧性环氧树脂复合材料胶接面润湿性的影响，并采用XPS光电子能谱分析仪对等离子处理前后的国产T800碳纤维/高韧性环氧树脂复合材料胶接面表面理化性能进行研究。结果表明：尽管J-375胶膜的室温剥离性能不如J-116B胶膜，但J-375胶膜具有更好的湿热老化性能。等离子处理后的国产T800碳纤维/高韧性环氧树脂复合材料的破坏模式由黏附破坏为主转变为内聚破坏为主，因此使两种胶膜的拉剪和剥离性能均有明显提高。这是由于等离子体处理能够重组复合材料表面的分子链，在胶接表面形成新的活性基团。Abstract: In this paper, the bonding surface of domestic T800 carbon fiber/high toughness epoxy composites was modified by grinding, sandblasting and plasma treatment. The test pieces of J-116B and J-375 adhesive films on floating roller peeling and tensile shear properties were prepared, respectively. The peel and shear properties of the J-116B and J-375 adhesive films were tested under different treatment conditions. The morphology of the samples before and after aging, without etching and after etching were observed by SEM. The contact angle tester was used to test the influence of different surface treatment methods on the wettability of the domestic T800 carbon fiber/high toughness epoxy composites bonding surface, and XPS was used to study the surface physicophysication performance of domestic T800 carbon fiber/high toughness epoxy composites before and after plasma treatment. The results show that J-375 film has better hygrothermal aging property although its room temperature peeling property is not as good as that of J-116B film. The failure mode of plasma treated domestic T800 carbon fiber/high toughness epoxy composites changed from adhesion failure to cohesive failure, so that the tensile shear and peel properties of the two films are significantly improved. This is because plasma treatment can recombine the molecular chain on the surface of the composite and form new active groups on the bonding surface.
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Key words:
- secondary bonding /
- interface /
- modification /
- grinding /
- sand blasting /
- plasma treatment
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图 3 不同表面处理方式国产T800碳纤维/高韧性环氧树脂复合材料室温剥离性能对比
Figure 3. Comparison of room temperature peeling performance of domestic T800 carbon fiber/high toughness epoxy composites with different surface treatments
图 4 不同表面处理方式国产T800碳纤维/高韧性环氧树脂复合材料室温拉伸和剪切性能对比
Figure 4. Comparison of tensile and shear properties of domestic T800 carbon fiber/high toughness epoxy composites with different surface treatment methods at room temperature
图 5 不同表面处理方式国产T800碳纤维/高韧性环氧树脂复合材料湿热老化处理后剥离性能对比
Figure 5. Comparison of peeling performance of domestic T800 carbon fiber/high toughness epoxy composites with different surface treatment methods after damp heat aging treatment
图 6 不同表面处理方式国产T800碳纤维/高韧性环氧树脂复合材料湿热老化处理后拉伸和剪切性能对比
Figure 6. Comparison of tensile and shear properties of domestic T800 carbon fiber/high toughness epoxy composites with different surface treatments after damp heat aging treatment
图 7 国产T800碳纤维/高韧性环氧树脂复合材料浮辊剥离断面的微观形貌
Figure 7. Micro-morphologies of floating roller stripped fracture-section of domestic T800 carbon fiber/high toughness epoxy composites
图 8 J-116B和J-375剥离的国产T800碳纤维/高韧性环氧树脂复合材料刻蚀后表面的微观形貌
Figure 8. Surface micro-morphologies of J-116B and J-375 stripped domestic T800 carbon fiber/high toughness epoxy composites after etching
图 9 不同方式表面处理的国产T800碳纤维/高韧性环氧树脂复合材料板表面接触角
Figure 9. Surface contact angles of domestic T800 carbon fiber/high toughness epoxy composite boards with different surface treatments
图 10 等离子处理前后国产T800碳纤维/高韧性环氧树脂复合材料板表面O1s的XPS图谱
Figure 10. XPS spectra of O1s of domestic T800 carbon fiber/high toughness epoxy composite boards before and after plasma treatment
图 11 等离子处理前后国产T800碳纤维/高韧性环氧树脂复合材料板表面的基团变化
Figure 11. Group changes on surface of domestic T800 carbon fiber/high toughness epoxy composite board before and after plasma treatment
表 1 浮辊剥离/拉伸剪切实验矩阵
Table 1. Experimental matrix of floating roller peeling/stretching shear
Sample No. Film type Grinding Sand blasting Plasma treatment Aging treatment SY-116B-1 J-116B Yes No No No SY-116B-2 J-116B Yes No No Yes SY-116B-3 J-116B No Yes No No SY-116B-4 J-116B No Yes No Yes SY-116B-5 J-116B No Yes Yes No SY-116B-6 J-116B No Yes Yes Yes SY-375-1 J-375 Yes No No No SY-375-2 J-375 Yes No No Yes SY-375-3 J-375 No Yes No No SY-375-4 J-375 No Yes No Yes SY-375-5 J-375 No Yes Yes No SY-375-6 J-375 No Yes Yes Yes 
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表 2 喷砂处理工艺参数
Table 2. Process parameters of sand blasting
No. Item Nominal parameter value 1 Jet pressure 0.02 MPa 2 Brown steel grit size 80# 3 Distance 20–30 mm 4 Speed 5 m/min
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表 3 等离子体处理工艺参数
Table 3. Process parameters of plasma treatment
No. Item Nominal parameter value 1 Output power 800 W 2 Ionizing medium Air 3 Nozzle-sample distance 100 mm 4 Speed 5 m/min 5 Pressure 0.1 MPa
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表 4 湿热老化后国产T800碳纤维/高韧性环氧树脂复合材料的性能保持率
Table 4. Performance retention rate of domestic T800 carbon fiber/high toughness epoxy composites after damp heat aging
Sample
No.Performance retention of
float roll peeling/%Performance retention
of stretch shear/%SY-116B-1
SY-116B-288.4 25.3 SY-116B-3
SY-116B-4100.5 16.9 SY-116B-5
SY-116B-697.2 15.5 SY-375-1
SY-375-2143.4 32.3 SY-375-3
SY-375-4136.3 33.4 SY-375-5
SY-375-6141.8 52.1
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表 5 经不同表面处理的国产T800碳纤维/高韧性环氧树脂复合材料板接触角对比
Table 5. Comparison of contact angles of domestic T800 carbon fiber/high toughness epoxy composite boards with different surface treatments
Surface treatment Contact angle/(°) Grinding 89.5 Sand blasting 74.5 Sand blasting+plasma treatment 0
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