Constructing spider-web-like PVDF fiber film via electrospinning and resin pre-coating for enhancing interfacial bonding between titanium alloy and CFRP

IF 7.8 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures Pub Date : 2026-09-01 Epub Date: 2026-08-28 DOI:10.1016/j.compstruct.2026.120838

Jinheng Zhang, Xueling Liang, Ning Yang, Shuying Shi, Wenjing Xu, Kecheng Zhou, Jing Song, Boris Fedulov, Alexey Fedorenko, Hao Liu, Fei Cheng

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引用次数: 0

Abstract

Reliable bonding between titanium alloy (Ti) and carbon fiber reinforced polymer (CFRP) is crucial in applications such as aero-engine blades. However, the smooth native oxide film on the Ti substrate surface and the inherent brittleness of the epoxy adhesive layer can readily lead to interfacial debonding failure. This study proposed an integrated surface treatment process combining laser engraving, electrospinning, and resin pre-coating (RPC). Laser engraving was employed to generate regular protrusions and micro-channels on Ti substrate surface, thereby providing mechanical anchoring sites and quasi-vertical infiltration spaces for epoxy resin. Electrospinning was then utilized to deposit a polyvinylidene fluoride (PVDF) fiber web with a controllable areal density (0.2–1.0 g/m²) onto the engraved surface, forming a three-dimensional porous network. Subsequently, the RPC treatment reduced the micro-void defects caused by the intrinsic hydrophobicity of PVDF, ensuring improved resin infiltration and establishing quasi-Z-directional fiber bridging. This approach was designed to construct a spider-web-like PVDF fiber film reinforcement structure at the bonding interface. Surface analysis demonstrated that the combined treatment effectively modulated the surface morphology, roughness, and wettability. Single lap shear tests revealed that the PVDF_0.4-Ti/CFRP composite (laser engraving + 0.4 g/m² PVDF fiber web + RPC) achieved a shear strength of 26.8 MPa, representing a 137.2% increase over the untreated control. Failure mode analysis further revealed that the failure mechanism transitioned from interfacial debonding to CFRP interlaminar tearing, confirming the effectiveness of the PVDF fiber web as an interfacial reinforcement and providing a new pathway for high-performance Ti/CFRP joining.

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通过静电纺丝和树脂预涂法制备类似蜘蛛网的PVDF纤维膜，增强钛合金与CFRP的界面结合

钛合金（Ti）和碳纤维增强聚合物（CFRP）之间的可靠结合在航空发动机叶片等应用中至关重要。然而，Ti基板表面光滑的天然氧化膜和环氧胶粘剂层固有的脆性容易导致界面脱粘失效。提出了一种激光雕刻、静电纺丝和树脂预涂（RPC）相结合的综合表面处理工艺。采用激光雕刻技术在Ti基板表面生成规则的突起和微通道，为环氧树脂提供机械锚定位点和准垂直渗透空间。然后利用静电纺丝将面密度可控（0.2-1.0 g/m2）的聚偏氟乙烯（PVDF）纤维网沉积在雕刻表面，形成三维多孔网络。随后，RPC处理减少了由PVDF固有疏水性引起的微孔缺陷，保证了树脂的渗透，建立了准z方向的光纤桥接。该方法的目的是在粘接界面处构建类似蜘蛛网的PVDF纤维膜增强结构。表面分析表明，复合处理有效地调节了表面形貌、粗糙度和润湿性。单接剪切试验表明，PVDF0.4-Ti/CFRP复合材料（激光雕刻+ 0.4 g/m2 PVDF纤维网+ RPC）的抗剪强度为26.8 MPa，比未处理的对照提高了137.2%。破坏模式分析进一步揭示了由界面脱粘到CFRP层间撕裂的破坏机制，证实了PVDF纤维网作为界面增强的有效性，为高性能Ti/CFRP连接提供了新的途径。

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来源期刊

Composite Structures 工程技术-材料科学：复合

CiteScore

12.00

自引率

12.70%

发文量

1246

审稿时长

78 days

期刊介绍： The past few decades have seen outstanding advances in the use of composite materials in structural applications. There can be little doubt that, within engineering circles, composites have revolutionised traditional design concepts and made possible an unparalleled range of new and exciting possibilities as viable materials for construction. Composite Structures, an International Journal, disseminates knowledge between users, manufacturers, designers and researchers involved in structures or structural components manufactured using composite materials. The journal publishes papers which contribute to knowledge in the use of composite materials in engineering structures. Papers deal with design, research and development studies, experimental investigations, theoretical analysis and fabrication techniques relevant to the application of composites in load-bearing components for assemblies, ranging from individual components such as plates and shells to complete composite structures.