CFRP层间碳纳米管定向喷涂工艺及断裂韧性研究

蒋鹏; 王仲奇; 常正平; 杨宗琪; 周旭; 冯征昊

doi:10.13801/j.cnki.fhclxb.20200824.004

CFRP层间碳纳米管定向喷涂工艺及断裂韧性研究

蒋鹏^1,,
王仲奇^1, ,,
常正平^1,,
杨宗琪^1,,
周旭^1,,
冯征昊^2,

1.
西北工业大学　机电学院，西安 710072
2.
伯明翰大学　冶金与材料学院，伯明翰 B15 2TT

基金项目: 陕西省重点研发计划(2019ZDLGY02-02)；硕士研究生创意创新种子基金(ZZ2019096)

详细信息

通讯作者:
王仲奇，硕士，教授，博士生导师，研究方向复合材料增强增韧及自治愈技术　E-mail：wangzhqi@nwpu.edu.cn

中图分类号: TB332；TB306
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出版历程
- 收稿日期: 2020-04-22
- 录用日期: 2020-08-20
- 网络出版日期: 2020-08-23
- 刊出日期: 2021-02-14

Interlaminar aligned carbon nanotubes spraying process and fracture toughness of CFRP

1.
School of Mechanical Engineering, Northwestern Polytechnical University, Xi’an 710072, China
2.
University of Birmingham, School of Metallurgy and Materials, Birmingham B15 2TT, Britain

摘要

摘要: 为了提高碳纤维增强树脂基复合材料(CFRP)层间性能，采用共沉淀法在碳纳米管上接枝磁性Fe₃O₄粒子，通过定向喷涂工艺使磁性碳纳米管(Fe₃O₄-MWCNTs)在碳纤维表面取向一致，并喷涂树脂加以固定，形成碳纤维-定向碳纳米管-树脂界面，采用真空辅助树脂渗透成形(Vacuum assisted resin infusion, VARI)工艺制备层间性能优异的Fe₃O₄-MWCNTs层间定向增强CFRP。试验结果表明，喷涂树脂可改善和巩固定向喷涂工艺。与未加磁场喷涂工艺相比，当Fe₃O₄-MWCNTs的质量分数为0.3wt%时，采用定向喷涂工艺试件的I型层间断裂韧性(G_IC)提升幅度最大，G_IC提高了37.7%。断面形貌分析表明其增强机制以树脂的塑性变形、Fe₃O₄-MWCNTs棒状聚集体的拔出及树脂塑性孔洞的生长为主。该研究为具有可控定向行为的磁性碳纳米管改性CFRP层间力学性能提供了新思路与方法。
- CFRP /
- 磁性碳纳米管 /
- 喷涂工艺 /
- 界面改性 /
- 断裂韧性
Abstract: Co-precipitation method was applied for grafting magnetic Fe₃O₄ particles on carbon nanotubes. In order to improve the interlayer properties of carbon fiber reinforced polymer (CFRP), the magnetic carbon nanotubes (Fe₃O₄-MWCNTs) were aligned on the surface of carbon fiber by spraying process after exposure to magnetic field to form ‘carbon fiber-aligned carbon nanotubes-resin’ interface, and were fixed by spraying the resin. Aligned Fe₃O₄-MWCNTs-reinforced CFRP with excellent interlaminar properties was prepared by vacuum assisted resin infusion (VARI) molding. The test results show spraying resin plays an important role in consolidating and improving aligned spraying process. Compared with non-magnetic spraying process, when the mass fraction of Fe₃O₄-MWCNTs is 0.3wt%, the mode I interlaminar fracture toughness (G_IC) increases by up to 37.7%. The main toughening mechanisms, which are pull-out and rupture of Fe₃O₄-MWCNTs aggregates, plastic deformation and plastic void growth of resin, are revealed by the fracture surface morphology. The research provides a new idea and method for interface modification of CFRP by adding Fe₃O₄-MWCNTs with controlled aligned behavior.
- CFRP /
- magnetic carbon nanotubes /
- spraying process /
- interface modification /
- fracture toughness

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图 1 磁性碳纳米管(Fe₃O₄-MWCNTs)粉末的磁响应

Figure 1. Magnetic response of magnetic carbon nanotubes (Fe₃O₄-MWCNTs) powder

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图 2 定向喷涂工艺设计

Figure 2. Design of aligned spraying process

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图 3 双悬臂梁试件侧视图

Figure 3. Side view of double cantilever beam specimen

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图 4 MWCNTs-COOH、Fe₃O₄和Fe₃O₄-MWCNTs的FTIR图谱

Figure 4. FTIR spectra of MWCNTs-COOH, Fe₃O₄ and Fe₃O₄-MWCNTs

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图 5 MWCNTs-COOH、Fe₃O₄和Fe₃O₄-MWCNTs的XRD图谱

Figure 5. XRD spectra of MWCNTs-COOH, Fe₃O₄ and Fe₃O₄-MWCNTs

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图 6 Fe₃O₄-MWCNTs的TEM图像

Figure 6. TEM image of Fe₃O₄-MWCNTs

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图 7 喷涂树脂对Fe₃O₄-MWCNTs层间定向增强CFRP的I型断裂韧性影响

Figure 7. Effect of spray resin on Model I interlaminar fracture toughness of aligned Fe₃O₄-MWCNTs-reinforced CFRP

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图 8 不同质量分数Fe₃O₄-MWCNTs下采用不同工艺CFRP的断裂韧性(G_IC)

Figure 8. Fracture toughness (G_IC) of CFRP with different processes and different mass fractions of Fe₃O₄-MWCNTs

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图 9 超声后不同质量分数的Fe₃O₄-MWCNTs乙醇分散液

Figure 9. Fe₃O₄-MWCNTs/ethanol dispersion containing different mass fractions of Fe₃O₄-MWCNTs after sonication

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图 10 磁场诱导对不同质量分数Fe₃O₄-MWCNTs CFRP的G_IC影响

Figure 10. Effect of magnetic field induction on G_IC of CFRP with different mass fractions of Fe₃O₄-MWCNTs

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图 11 定向喷涂0.5wt% Fe₃O₄-MWCNTs碳纤维表面的SEM图像

Figure 11. SEM images of carbon fiber surface after aligned spraying with 0.5wt% of Fe₃O₄-MWCNTs

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图 12 未改性CFRP断面的SEM图像

Figure 12. Cross-sectional SEM image of the fracture surface of the unmodified CFRP

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图 13 0.5wt%Fe₃O₄-MWCNTs层间非定向增强CFRP断面的SEM图像

Figure 13. Cross-sectional SEM image of the fracture surface of unaligned Fe₃O₄-MWCNTs-reinforced CFRP with 0.5wt% of Fe₃O₄-MWCNTs

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图 14 0.5wt%Fe₃O₄-MWCNTs层间定向增强CFRP断面的SEM图像

Figure 14. Cross-sectional SEM image of the fracture surface of aligned Fe₃O₄-MWCNTs-reinforced CFRP with 0.5wt% of Fe₃O₄-MWCNTs

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图 15 0.5wt%Fe₃O₄-MWCNTs层间定向增强CFRP的失效机制

Figure 15. Failure mechanism of aligned Fe₃O₄-MWCNTs-reinforced CFRP with 0.5wt% of Fe₃O₄-MWCNTs

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表 1 不同Fe₃O₄-MWCNTs质量分数下采用不同工艺成型的试件

Table 1 Manufactured specimens by different processes with different mass farctions of Fe₃O₄-MWCNTs

Process	Specimen	Mass fraction of Fe₃O₄-MWCNTs/wt%
Without spraying process	Unmodified CFRP	0	−	−	−
Aligned spraying process without resin	Comparison CFRP	0.5	−	−	−
Unaligned spraying process with resin	Unaligned Fe₃O₄-MWCNTs-reinforced CFRP	0.3	0.5	0.7	0.9
Aligned spraying process with resin	Aligned Fe₃O₄-MWCNTs-reinforced CFRP	0.3	0.5	0.7	0.9
Note: CFRP—Carbon fiber reinforced polymer.

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