Corrosion-Protective Bushing Structure for Delamination Resistance
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Solution Overview
Problem
Existing maintenance-free bushings face challenges with corrosion resistance and delamination when exposed to environmental conditions, particularly when the load-bearing substrate is made of iron alloys, which affects their longevity and load capability.
Innovation Solution
A sliding article comprising a load-bearing substrate coated with a metal-containing corrosion protective layer, made of magnesium, aluminum, titanium, scandium, or zinc, and a sliding layer applied over the substrate, with specific thickness ratios and surface structures to enhance corrosion resistance and maintain high load-bearing capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a load bearing substrate made of iron alloys is used, then high load capability is achieved, but corrosion resistance deteriorates when exposed to environmental conditions
Solution Approach 1:
The invention uses a composite structure consisting of a load-bearing substrate (iron alloy) combined with a corrosion-protective metal-containing layer. This composite material approach allows the substrate to provide high load capability while the overlaying metal-containing layer provides corrosion resistance, thus resolving the contradiction between strength and corrosion resistance.
Solution Approach 2:
The metal-containing layer acts as an intermediary between the iron alloy substrate and the corrosive environment. It serves as a protective barrier that prevents direct contact between the substrate and environmental factors causing corrosion, while still allowing the substrate to fulfill its load-bearing function.
2Ease of operation
If adhesive laminating is used to connect substrate and sliding layer, then maintenance free operation is achieved, but delamination resistance deteriorates under environmental exposure
Solution Approach 1:
The invention changes the material parameters by introducing a metal-containing layer with specific thickness (at least 25 μm) and composition between the substrate and sliding layer. This parameter change enhances the overall stability and delamination resistance of the composite structure under environmental exposure while maintaining maintenance-free operation.
3Object-affected harmful factors
If corrosion protective coating is applied, then corrosion resistance is improved, but manufacturing complexity increases
Solution Approach 1:
The invention applies a metal-containing layer with specific local properties (thickness of at least 25 μm, containing specific metals) only where corrosion protection is needed on the load-bearing substrate. This localized approach provides effective corrosion protection while avoiding unnecessary complexity in other areas of the component.
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 significantly increases the corrosion resistance and maintenance-free lifetime of bushings, achieving a Corrosion Resistance Rating of at least 1000 hours and maintaining high tensile strength, while allowing for high load-bearing capacity and sizing capability.
Implementation Method 1
The metal containing layer is a corrosion protective layer and contains a metal selected from magnesium, aluminium, titanium, scandium, zinc, or any combination thereof
Data Source
Figure 1A~1D
Figure 2A~2B
Figure 3A~3B
AI summary
A sliding article comprising: a load bearing substrate, having a first major surface, a second major surface, and an edge, the load bearing having a thickness t1, an metal containing layer overlying and in direct contact with the first major surface, the metal containing layer having a thickness t2, wherein t2 is at least 10 microns, a sliding layer overlying the first or the second major surface, wherein a ratio of t2/tl is at least 1/10.