Plasma-Sprayed Polymer Mold Coating for Thermoplastic Composite Adhesion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Thermoplastic composite materials face challenges in adhering to complex mold surfaces during lay-up processes due to lack of tackiness, leading to difficulties in initial ply placement and subsequent removal of composite parts from the mold, which limits their use in aerospace and high-performance applications.
Innovation Solution
A non-porous metal mold tool with a textured surface and a releasably adhered surface layer polymer coating, preferably thermoplastic particles applied by plasma spraying, enhances adhesion of the first ply of fiber-reinforced thermoplastic composite materials while allowing easy separation of the composite part, and can include a release film to maintain dimensional accuracy and facilitate removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If thermoplastic composite materials are used for fiber-reinforced structures, then processing speed and production rate are improved, but adhesion to mold surfaces during lay-up deteriorates due to lack of tackiness
Solution Approach 1:
A plasma-sprayed polymer coating layer is applied to the mold surface to act as an intermediary between the thermoplastic composite material and the mold. This coating provides the necessary tackiness for initial ply adhesion during automated tape placement, enabling thermoplastic materials to be processed at high speeds without compromising adhesion to the mold surface.
2Reliability
If thermoplastic particles are plasma sprayed to form a surface layer coating, then adhesion of first ply is improved, but processing complexity increases
Solution Approach 1:
The plasma-sprayed polymer coating is applied to the mold surface in advance, before the automated tape placement process begins. This preliminary action prepares the mold surface with the necessary adhesion properties, allowing subsequent high-speed thermoplastic composite processing without requiring complex real-time adhesion control during manufacturing.
3Reliability
If a surface layer polymer coating is applied to enhance adhesion, then first ply placement is improved, but removal of composite parts from mold becomes difficult
Solution Approach 1:
The plasma-sprayed polymer coating provides localized adhesion enhancement only at the mold surface interface where it is needed for initial ply placement. The coating's properties are optimized to provide sufficient tackiness for adhesion during processing while maintaining ease of part removal after curing, achieving both requirements through targeted surface modification.
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
The solution improves the adhesion and processing efficiency of thermoplastic composite materials, reducing material de-bonding and processing time, and enables the production of high-quality composite parts with improved interlaminar properties and reduced capital and facility costs.
Implementation Method 1
The surface layer polymer coating is preferably thermoplastic particles applied by plasma spraying to the mold tool or prepreg to form a substantially fused layer of thermoplastic particles
Data Source
AI summary
A prepared mold tool having a thermoplastic surface layer polymer coating on the mold surface of the mold tool or prepared prepreg having a thermoplastic surface layer polymer coating on the surface of the thermoplastic fiber reinforced prepreg are described that enhance first ply laydown of thermoplastic fiber reinforced composite prepregs onto mold tools for prepreg forming or in situ tape placement. Resulting thermoplastic fiber reinforced composite parts from a thermoplastic fiber reinforced thermoplastic composite material having structural reinforcement fibers with one or more high performance polymers, and a thermoplastic surface layer polymer coating which forms a polymer blend with the high performance polymers of the thermoplastic fiber reinforced composite material thereby imparting improved properties, and methods for making and using same, are provided herein.