Lubricant Composition with Copper Nanoparticles and Deactivator
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Solution Overview
Problem
Existing lubricants face challenges in efficiently forming in-situ Diamond-Like-Carbon (DLC) layers with reduced friction and wear, as they often require difficult application methods and can be affected by copper content, leading to viscosity issues and sludge formation.
Innovation Solution
A lubricant composition comprising hydrocarbon-based oils or greases with non-ferrous metal nanoparticles and a non-ferrous metal deactivator, which includes specific additives and inhibitors to prevent copper aging and promote DLC layer formation while maintaining lubricant stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If copper particles are used to catalyze DLC layer formation, then friction and wear are reduced, but viscosity increases and sludge formation occurs
Solution Approach 1:
The harmful effects of copper are extracted and isolated by introducing a deactivator substance that selectively binds to copper particles. This separates the beneficial catalytic function (localized at tribological contacts) from the harmful bulk effects (viscosity increase and sludge formation), allowing copper to be used without its detrimental side effects.
Solution Approach 2:
A deactivator substance acts as an intermediary between copper particles and the lubricant base stock. This intermediary selectively interacts with copper to prevent harmful bulk reactions while allowing copper to maintain its catalytic function at metal surfaces under tribological stress.
2Reliability
If DLC layers are formed by CVD or PVD processes, then wear and friction are minimized, but application difficulty increases under operating conditions
Solution Approach 1:
The lubricant composition performs self-service by containing all necessary components (carbon source and catalyst) to form DLC layers in-situ under operating conditions. The system automatically deposits protective carbon layers on metal surfaces during normal operation without requiring external CVD or PVD equipment or processes.
Solution Approach 2:
The invention changes the parameters of DLC formation from vacuum-based CVD/PVD processes to ambient-condition tribological processes. By modifying the formation conditions to match normal operating parameters (temperature, pressure, shear stress), the application becomes straightforward and integrates seamlessly into service conditions.
3Reliability
If copper content is increased to enhance DLC formation, then friction coefficient decreases, but lubricant stability deteriorates
Solution Approach 1:
The deactivator serves as an intermediary that selectively binds to copper particles, preventing copper from reacting with the lubricant base stock and causing degradation. This intermediary allows higher copper content to be used for enhanced friction reduction while the deactivator maintains lubricant stability by controlling copper's reactivity.
Solution Approach 2:
The harmful reactivity of copper is extracted and neutralized by the deactivator, separating the beneficial friction-reducing catalytic effect from the harmful stability-deteriorating effects. This allows copper to be present in higher concentrations without compromising lubricant stability.
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 lubricant composition achieves low friction coefficients, extended service life, and reduced wear on components by effectively forming DLC layers with improved viscosity stability and wear protection.
Implementation Method 1
Hydrocarbon-based lubricants react on this layer under tribological stress, forming a DLC coating, which is attributed to the catalytic effect of the copper.
Implementation Method 2
The non-metallic deactivators or inhibitors are substances that protect the metallic surface of the nanoparticles from corrosive attack, for example by oxygen forming oxides
Implementation Method 3
The DLC layers are produced by depositing the carbon layers using chemical vapor deposition (CVD) or physical vapor deposition (PVD) processes, usually in a vacuum. For example, US 9,951,291 B2 describes the process of coating the surface of a tribosystem with a nanocomposite layer consisting of MoNx or VN2 and copper via plasma treatment.
Data Source
AI summary
The invention relates to the use of new lubricants for the in-situ formation of diamond-like carbon (DLC) layers. The invention particularly relates to a lubricant in the form of an oil or grease on the basis hydrocarbons, which contains nonferrous metal particles and simultaneously a nonferrous metal deactivator.