Method for inducing resin secondary permeation based on laser CFRP interface pretreatment

By constructing composite micro-nano structures on the surface of CFRP and utilizing channels and fractal structures formed by nanosecond pulsed fiber lasers and ultrafast lasers to promote adhesive penetration, the interfacial strength and durability issues of CFRP composite materials during bonding were solved, achieving high-strength bonding effects.

CN120885876AActive Publication Date: 2025-11-04NINGBO INSTITUTE OF TECHNOLOGY BEIHANG UNIVERSITY +1
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Patent Information

Application Number
CN202511216175.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-08-28
Publication Date
2025-11-04
Estimated Expiration
2045-08-28

AI Technical Summary

Technical Problem

CFRP composites have fewer surface-active functional groups, lower surface energy, higher inertness, and smoother surfaces, making it difficult to bond with resin during bonding, which affects adhesive strength and durability. Traditional laser pretreatment methods are difficult to balance the rapid spreading and deep penetration of adhesives.

Method used

Nanosecond pulsed fiber lasers are used to process macroscopic flow channels on the CFRP surface, and combined with ultrafast lasers to form nano-waves or micron-scale dendritic fractal structures, forming a composite micro-nano structure. This promotes the macroscopic spreading and microscopic penetration of the adhesive, and enhances the interfacial mechanical bonding and chemical adhesion.

Benefits of technology

It significantly improves the bonding strength and durability of CFRP, achieving high-strength interfacial bonding through the combined action of mechanical locking and chemical bonding, thus solving the problems of low CFRP bond strength and poor fatigue resistance.

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Abstract

The invention relates to the technical field of composite material interface enhancement, in particular to a method for inducing resin secondary permeation based on laser CFRP interface pretreatment, which comprises the following steps of: performing scanning processing on a to-be-glued surface of a CFRP matrix by adopting nanosecond pulse fiber laser to form a macroscopic flowing channel, and completely removing a resin layer in the channel and exposing carbon fibers or glass fibers, so as to realize the secondary permeation of resin on the to-be-glued surface of the CFRP matrix. Forming a primary structure; ultrafast laser is adopted for scanning on the surface of the macroscopic flow channel to form a nano-corrugated or micron-sized dendritic fractal secondary structure; uniformly placing a resin cementing agent on the surface of the secondary structure which is spliced on the upper layer and the lower layer to obtain a CFRP-cementing agent-CFRP structure joint; and the CFRP-cementing agent-CFRP structural joint is subjected to hot pressing treatment. According to the method, a composite micro-nano structure of a primary structure and a secondary structure is constructed on the surface of the CFRP in a layering manner, so that macroscopic spreading and microscopic permeation of the adhesive are remarkably promoted, and the interface mechanical occlusion and chemical bonding capacity is enhanced.
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