Atmospheric Plasma Surface Treatment for Composite Bonding
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Solution Overview
Problem
Existing methods for bonding composite materials, such as carbon-fiber-reinforced PEEK, face challenges in achieving strong adhesion due to their size and shape limitations, as well as the need for expensive vacuum equipment and restricted treatment of rigid three-dimensional structures, leading to inadequate bond strength and increased weight in applications like aircraft.
Innovation Solution
A method utilizing a self-contained atmospheric pressure plasma delivery device that treats composite surfaces with a reactive gas beam, allowing for the application of adhesive and curing to form a strong, permanent bond, regardless of the composite's size or shape, using a portable device that generates a reactive gas beam exterior to the device and can be easily maneuvered over complex structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If vacuum plasma equipment is used to treat composite surfaces, then adhesion strength is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces the mechanical vacuum system with a gas flow-based atmospheric plasma system. The plasma is generated and delivered through a handheld device that uses gas flow to sustain the plasma discharge, eliminating the need for vacuum pumps, chambers, and associated mechanical systems while achieving effective surface treatment for bonding.
Solution Approach 2:
The atmospheric plasma system is self-sustaining through the continuous flow of process gas. The gas serves multiple functions: it sustains the plasma discharge, provides reactive species for surface modification, and cools the treatment zone. This self-service capability eliminates dependence on complex vacuum infrastructure.
2Stability of the object's composition
If vacuum chambers are used for plasma treatment, then surface activation is achieved, but adaptability to different sizes and shapes is reduced
Solution Approach 1:
The patent divides the plasma treatment process into a portable, handheld device that can be manually positioned and maneuvered over different surfaces. This segmentation allows the treatment zone to be applied locally to various geometries, sizes, and shapes without requiring the entire workpiece to fit within a vacuum chamber.
Solution Approach 2:
The system transitions from a static vacuum chamber configuration to a dynamic, mobile plasma delivery device. The handheld applicator can be moved freely to treat different areas of workpieces with varying geometries, providing adaptability to different sizes and shapes while maintaining effective surface activation.
3Weight of moving object
If adhesive bonding is used instead of mechanical fastening, then weight is reduced, but bond strength is insufficient without surface treatment
Solution Approach 1:
The patent applies atmospheric plasma treatment as a preliminary surface preparation step before adhesive bonding. This preliminary action activates the composite surface by introducing polar groups and increasing surface energy, creating an optimized substrate that ensures strong adhesive bonds and eliminates the need for mechanical fasteners.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method enables effective bonding of composite materials with cohesive failure within the adhesive, reducing the weight and increasing the strength of structures like aircraft, while eliminating the need for vacuum equipment and accommodating various composite shapes and sizes.
Implementation Method 1
subjecting at least a part of a composite work piece to a low-temperature, atmospheric pressure plasma
Implementation Method 2
using an atmospheric pressure plasma to treat at least a part of the surfaces of the composite work piece, thereby activating the surface for adhesive bonding
Data Source
AI summary
A method for bonding composites together that is fast and effective, and can be applied to any structure regardless of its size and shape, and its related product are disclosed. The method comprises first subjecting at least a part of a composite work piece to a low-temperature, atmospheric pressure plasma, wherein the reactive gas from the plasma is projected out of the device and onto the surface of the composite work piece, then applying an adhesive to the surface of the treated composite work piece, and joining the composite work piece together with a second work piece. The adhesive may be cured such that it forms a strong, permanent bond. The atmospheric plasma delivery device may be translated over the composite surface by hand or with a robot. The plasma device may be self-contained and portable, and can be moved to a location that is convenient for treating the composites.