Effect of Adhesive Injection on Adhesion of Silane Grafted Ni/CFRP

doi:10.3901/JME.2023.06.084

Abstract

Abstract: For the problem of insufficient bonding strength and low stability of Ni shields of composite (Carbon fibre reinforced plastics, CFRP) blades, an adhesive injection method is proposed to strengthen KH550 grafted Ni/CFRP bonding. The adhesive, pushed by a piston, is injected into the sealed bonding area. After the filling, a packing process is conducted to enhance the bonding. The morphology and chemical composition of the surface and the interface are characterized by scanning electron microscopy (SEM), X-ray energy spectroscopy (EDS) and Fourier transform infrared spectroscopy (FTIR). Molecular dynamics simulation is used to analyze the effect of pressure on the chemical reaction processes at the bonding interface. The results show that the shear strength of Ni/CFRP samples grafted with 1% KH550 is increased by 15.7%. The shear strength and bonding stability are further increased by 4.8% and 29.3% respectively through the adhesive injection method. Bubbles and cracks in the adhesive layer are effectively reduced with the method. The penetration of adhesive into micro structure is promoted. The molecular distance at the interface is reduced, and the physical adsorption is enhanced. Furthermore, the reaction between the adhesive molecules and the coupling agent molecules is promoted, and the chemical bonding ratio between the interface molecules is increased. The adhesive injection method, promoting the mechanical interlocking, physical adsorption and chemical reaction at the interface, improves the bonding property, which provides a reference for strengthening the bonding of complex parts.

Key words: silane coupling agent, pressure injection, adhesive bond, molecular dynamics

CLC Number:

TG496

WANG Hui, HUANG Kai, SUN Zhanpeng, HUA Lin, CHEN Yizhe. Effect of Adhesive Injection on Adhesion of Silane Grafted Ni/CFRP[J]. Journal of Mechanical Engineering, 2023, 59(6): 84-94.

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