ENHANCING BONDING PERFORMANCE IN CF/EPOXY COMPOSITES THROUGH CNT-REINFORCED ADHESIVE AND PROCESS OPTIMIZATION

Tae-Sun Bang, Do-Hoon Shin and Yun-Hae Kim
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Tae-Sun Bang: Department of Advanced Materials Convergence Engineering, National Korea Maritime and Ocean University, 727 Taejong-ro, Yeongdo-gu, Busan 49112, Republic of Korea
Do-Hoon Shin: ��Aero-structure Development Engineering, Korean Air Aerospace Division, Busan 46712, Republic of Korea
Yun-Hae Kim: Department of Advanced Materials Convergence Engineering, National Korea Maritime and Ocean University, 727 Taejong-ro, Yeongdo-gu, Busan 49112, Republic of Korea

Surface Review and Letters (SRL), 2025, vol. 32, issue 07, 1-8

Abstract: Thermosetting composites are widely used across various industries because of their excellent mechanical properties, thermal stability, and chemical resistance. These materials are commonly provided as standard-thickness panels, stored until needed, and subsequently joined or assembled to meet specific thickness and shape requirements. This study employed a two-step bonding process to improve adhesive performance in CF/Epoxy composites. First, the temperature-dependent viscosity of toughened epoxy was used to disperse through ultrasonic mixing, enhancing the bonding strength and mechanical properties. A bonding performance test conducted under ASTM D5868 showed that CNT reinforcement improved the bonding properties. However, high-temperature curing sometimes causes adhesive leakage, degrading the bonding quality. To improve this issue, a pre-impregnated carbon fiber sheet was developed to stabilize the adhesive layer and prevent leakage. This step further enhanced the bonding reliability and interfacial uniformity. For neat, the maximum load increased from 5.66kN to 7.52kN, reflecting a 33% enhancement—similarly, the maximum load for 0.1 wt.% CNT improved from 6.83kN to 7.85kN (15%). Failure behavior was analyzed through OM and SEM. This study presents a novel bonding strategy combining CNT-reinforced toughened epoxy with pre-impregnated sheets, thereby addressing both conventional adhesive limitations.

Keywords: Thermoset composites; adhesive bonding; toughened epoxy; CNTs (search for similar items in EconPapers)
Date: 2025
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DOI: 10.1142/S0218625X25400049

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