Coating Interface With Undercut Joint Conduits
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Solution Overview
Problem
Existing coating interfaces on composite substrates face challenges with adhesion due to lack of chemical or physical attraction between the substrate and coating, particularly at high temperatures, leading to compromised performance in gas turbine engine components.
Innovation Solution
The formation of undercut joint conduits on the substrate surface, which are designed to mechanically entrap the coating, increasing the surface area and adhesion by using interlocking geometry, thereby enhancing the bond strength between the coating and substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional coating interfaces are used on composite substrates, then the coating can be applied to the substrate surface, but adhesion is poor due to lack of chemical or physical attraction, especially at high temperatures
Solution Approach 1:
Undercut joint conduits are formed into the substrate surface before the coating is applied. This preliminary structural preparation creates mechanical interlocking features that will engage with the coating material, ensuring strong adhesion before the coating process begins.
Solution Approach 2:
The coating interface is transformed from a simple two-dimensional surface contact to a three-dimensional mechanical interlock structure. The undercut conduits create vertical and lateral engagement dimensions, converting a planar adhesion problem into a volumetric mechanical bonding solution.
2Strength
If the coating is formed on a smooth substrate surface, then the coating application is simple, but the bond strength between coating and substrate is insufficient
Solution Approach 1:
The undercut joint conduits are prepared in advance on the substrate surface before coating application. This preliminary structuring creates the mechanical interlocking geometry needed for strong bonding, separating the surface preparation complexity from the coating application simplicity.
3Object-affected harmful factors
If conventional coating interfaces are used, then the substrate can be coated, but the resistance to oxidation and corrosive attacks at high temperatures is compromised
Solution Approach 1:
The mechanical interlocking structure is established before the coating is applied, creating a robust physical bond that will maintain integrity under high temperature and corrosive conditions. This preliminary structural reinforcement ensures the coating remains adhered even when exposed to harsh environments.
Solution Approach 2:
The solution combines the substrate material with the coating material through a composite mechanical interlock structure. The undercut conduits create a hybrid interface where both materials work together synergistically, with the coating providing environmental protection and the substrate providing structural support, bonded through mechanical interlocking.
Data Source
AI summary
In one example, article comprising a substrate defining an outer surface; a plurality of joint conduits formed in the outer surface of the substrate, wherein each conduit of the plurality of joint conduits exhibits an undercut configuration; and a coating formed on the outer surface of the substrate, wherein the coating substantially fills the plurality of joint conduits formed in the surface of the substrate.