Copper Alloy Composition for Lubricant-Resistant Synchronizer Rings
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Solution Overview
Problem
Existing copper alloys used in gear components like synchronizer rings face challenges with corrosion resistance due to sulfur and phosphorus additives in lubricants, leading to reduced lifespan and wear issues, especially under thermomechanical loads and friction stresses, requiring a solution that adapts to various lubricant systems and additives.
Innovation Solution
A copper alloy with a composition of 54-65% copper, 2.5-5.0% aluminum, 1.0-3.0% silicon, 2.0-4.0% nickel, 0.1-1.5% iron, ≤1.5% manganese, ≤1.5% tin, ≤0.8% chromium, and the remainder zinc, with free silicon present in the alloy matrix or non-silicide phases, forming a stable reaction layer that is resistant to corrosion and wear across different lubricant systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If copper alloys are used to reduce corrosive effect of sulfur constituents in lubricant, then corrosion resistance is improved, but wear resistance and mechanical strength deteriorate under thermomechanical load
Solution Approach 1:
The patent applies composite materials by combining multiple alloying elements (Al, Si, Ni, Fe, Mn, Ti) with copper to create a multi-phase microstructure. This composite structure integrates different phases (α-phase matrix, γ-phase precipitates, intermetallic compounds) that collectively provide both corrosion resistance from protective layers and mechanical strength from hard precipitates, resolving the contradiction between these two properties.
Solution Approach 2:
The patent applies local quality by creating distinct microstructural regions with different properties. The α-phase matrix provides ductility and forms protective corrosion-resistant layers at the surface, while dispersed γ-phase precipitates and intermetallic compounds provide local hardening and wear resistance. This spatial distribution of different phases allows simultaneous achievement of corrosion resistance and mechanical strength.
2Strength
If hard phase precipitation is introduced to reinforce surface hardness and reduce wear, then wear resistance is improved, but corrosion resistance deteriorates due to accelerated reaction layer formation under thermal load
Solution Approach 1:
The patent applies local quality by creating a heterogeneous microstructure where hard γ-phase precipitates and intermetallic compounds are dispersed within a corrosion-resistant α-phase matrix. The hard phases provide localized wear resistance at contact points, while the continuous α-phase matrix maintains overall corrosion resistance by forming protective surface layers, preventing the trade-off between wear and corrosion resistance.
Solution Approach 2:
The patent merges multiple functions into a single multi-phase microstructure. The α-phase provides both the matrix structure and corrosion resistance, while γ-phase precipitates and intermetallic compounds provide wear resistance. This merging of functions within a unified microstructure allows simultaneous achievement of wear resistance and corrosion resistance without the need for separate protective layers.
3Strength
If aluminum and silicon are added to form intermetallic hard phases, then wear resistance is improved, but the alloy becomes more susceptible to embrittlement
Solution Approach 1:
The patent applies parameter changes by precisely controlling the composition ranges of Al (2.0-4.0%), Si (1.0-3.0%), and other alloying elements. By optimizing these parameters, the alloy forms a balanced microstructure with sufficient hard phase precipitation for wear resistance while maintaining ductility and preventing embrittlement. The controlled composition ensures intermetallic phases form without excessive brittleness.
Solution Approach 2:
The patent applies composite materials by creating a multi-phase microstructure where intermetallic compounds (Al2Cu, Al5FeSi, Ni3Al) are dispersed within a ductile α-phase copper matrix. This composite structure provides wear resistance from the hard intermetallic phases while the continuous ductile matrix prevents embrittlement, allowing the alloy to maintain both wear resistance and reliability.
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 alloy achieves high corrosion resistance and mechanical strength, with low wear and adaptive friction coefficients, maintaining stability across various tribological systems and lubricant additives, allowing for broad compatibility with different lubricants without significant changes in the reaction layer formation.
Implementation Method 1
Under a friction stress, an adsorption layer consisting primarily of lubricant additives is formed after only a brief contact time with a lubricant under a frictional load
Implementation Method 2
Diffusion processes and oxidation processes involving the substrate alloy can also influence the formation of the reaction layer in the region of the internal boundary layer
Implementation Method 3
a reactive layer develops beneath the adsorption layer comprised of components of the adsorption layer and alloy constituents near the surface reacting with one another
Implementation Method 4
Diffusion processes and oxidation processes involving the substrate alloy can also influence the formation of the reaction layer in the region of the internal boundary layer
Data Source
AI summary
A copper alloy having a high corrosion resistance for a wide range of different lubricants, in particular different base oils and a variation of lubricant additives. The property of a low corrosion tendency for different tribological systems is also combined with good mechanical properties, and a high strength in particular. The alloy has a low wear and coefficient of friction. The lubricant-compatible copper alloy is suitable for producing components that come in contact with lubricant and are exposed to friction stresses, such as gear components, for example synchronizer rings. A method for manufacturing such components and a gear having at least one such component is also disclosed.