Interlayer Composite Substrates for Wear-Resistant Coatings
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Carbon-carbon composites, such as CFRPs, face limitations in wear resistance, thermal and electrical conductivity, and susceptibility to oxidation, which restrict their use in demanding applications, and existing coating methods often damage the composite materials during high-energy or high-temperature processes.
Innovation Solution
A method for depositing an interlayer on composite substrates with a varying chemical concentration gradient of silicon oxy-carbide, where the concentration of elements like carbon and oxygen is higher at the substrate-proximal layer and lower at the surface-proximal layer, using techniques like plasma-enhanced vapor phase deposition to enhance adhesion and protect the substrate during subsequent coating processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermal spray coating or high-temperature coating processes are applied to CFRP surfaces to improve wear resistance and other properties, then the coating provides enhanced functionality, but the epoxy used in CFRPs degrades and the composite material is damaged
Solution Approach 1:
An interlayer is introduced as an intermediary between the CFRP substrate and the thermal spray coating. This interlayer acts as a protective mediator that shields the epoxy-containing CFRP from the harmful effects of high-temperature coating processes, preventing epoxy degradation while still enabling the application of wear-resistant coatings.
Solution Approach 2:
The interlayer is applied in advance before the thermal spray coating process. This preliminary action prepares the substrate by providing a protective barrier that will withstand the subsequent high-temperature coating process, preventing damage to the underlying CFRP structure.
2Reliability
If functionally graded materials (FGMs) are used as thin film coatings to achieve good adhesion and improved functionality, then adhesion is improved, but the coating complexity increases and control of the gradient becomes difficult
Solution Approach 1:
The interlayer utilizes functionally graded materials where the chemical composition varies continuously through the thickness. By changing parameters such as silicon and oxygen concentration gradients, the material properties transition smoothly from substrate-compatible at the bottom to coating-compatible at the top, achieving excellent adhesion while managing complexity through controlled compositional variation.
3Reliability
If plasma treatment, chemical treatment, or mechanical treatment is applied to the CFRP surface to improve coating adhesion, then adhesion is improved, but processing time and cost increase
Solution Approach 1:
The interlayer is deposited as a preliminary protective layer that inherently provides good adhesion to the CFRP substrate without requiring subsequent plasma, chemical, or mechanical treatments. This preliminary action eliminates the need for multiple additional surface preparation steps, reducing overall processing time and cost.
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 interlayer provides improved adhesion and protection for composite substrates, enabling their use in more demanding applications by maintaining the integrity of the composite material during high-energy and high-temperature coatings, and enhancing mechanical, thermal, and electrical properties.
Implementation Method 1
depositing an interlayer on the surface, the interlayer having a substrate-proximal layer comprising a first composition, and a surface-proximal layer comprising a second composition
Data Source
Figure 1
Figure 2~5
AI summary
An interlayer configured for a composite substrate surface, the interlayer having a higher concentration of at least one first chemical element at the interface of the substrate surface and the innermost interlayer surface and a higher concentration of at least one second chemical element at the outermost interlayer surface is disclosed. Methods of forming the interlayer and providing functional properties to said composites are disclosed.