Composite Lubricating Material Graphite Layer Ratio
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Solution Overview
Problem
Existing lubricating materials face challenges in achieving significant improvements in lubricity, particularly with the direct coating of graphite being difficult to reapply and the dispersion of carbon fibers and nanotubes in base oil not providing substantial sliding performance enhancements, while the effectiveness of tourmaline powders in preventing oxidation and decomposition is unclear.
Innovation Solution
A composite lubricating material comprising a graphite-based carbon material with a rhombohedral and hexagonal layer structure, where the ratio of rhombohedral to hexagonal layers is 31% or more, dispersed in a base material, along with additives such as radioactive substances to enhance lubricity and prevent oxidation, is used.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If graphite is directly coated on sliding parts, then lubricity is improved, but reapplication becomes difficult
Solution Approach 1:
The invention extracts the beneficial lubricating properties of graphite and transfers them to a removable filter element. Graphite particles are captured on the filter element during normal operation, concentrating the lubricating material where it is most needed, while allowing easy removal and replacement of the filter element for reapplication.
Solution Approach 2:
The filter element serves as an intermediary carrier for graphite particles. Instead of directly coating sliding parts with graphite (which is difficult to reapply), the graphite is first captured on the filter element, which then acts as a reservoir for controlled reapplication to the sliding surfaces.
2Reliability
If carbon fibers and carbon nanotubes are dispersed in base oil, then sliding performance is improved, but the effect is not significant
Solution Approach 1:
Instead of uniformly dispersing carbon materials throughout the entire base oil (which yields minimal improvement), the invention concentrates graphite particles locally on the filter element surface that directly contacts the sliding parts. This localized concentration creates a high-density lubricating layer exactly where friction occurs, dramatically improving sliding performance.
Solution Approach 2:
The invention creates a composite structure by combining the filter element with captured graphite particles. This composite material on the filter element surface provides superior lubricating properties compared to simple dispersion of carbon materials in base oil, as it creates a concentrated, adherent lubricating layer on the sliding surfaces.
3Duration of action of stationary object
If tourmaline powders are added to prevent oxidation, then lubricant life is extended, but lubricity improvement is unclear
Solution Approach 1:
The invention merges the oxidation prevention function (traditionally provided by additives like tourmaline) with the lubricity function (provided by graphite) into a single integrated system. The filter element captures and concentrates graphite particles while also providing a surface that prevents oxidation, combining both protective functions in one component.
Solution Approach 2:
The filter element is designed to perform multiple functions simultaneously: it filters contaminants from the lubricant, captures and concentrates graphite particles for lubricity enhancement, and prevents oxidation of the base oil. This multi-functional approach extends lubricant life while clearly improving lubricity, unlike tourmaline powders which only address oxidation.
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 composite lubricating material effectively improves lubricity by increasing the density of graphene-like graphite, reducing friction, and prolonging the life of the lubricant through enhanced dispersion and antioxidative properties, leading to better fuel efficiency and performance in engine and transmission applications.
Implementation Method 1
addition of molybdenum disulfide (MoS2) or flaky graphite having a layered crystal structure, which exhibit low shearing resistance
Implementation Method 2
addition of carbon materials, such as carbon fibers and carbon nanotubes, having an antioxidative effect and a decomposition/deterioration preventive effect for base oil, and radioactive substances generating a negative ion
Implementation Method 3
A part or whole of the graphene precursor is exfoliated by ultrasonic waves, stirring and sliding to produce a mixed material being 'graphene-like graphite'
Implementation Method 4
A part or whole of the graphene precursor is exfoliated by ultrasonic waves, stirring and sliding
Data Source
AI summary
A composite lubricating material including at least a graphite-based carbon material and/or graphene-like graphite exfoliated from the graphite-based carbon material dispersed in a base material. The graphite-based carbon material is characterized by having a rhombohedral graphite layer (3R) and a hexagonal graphite layer (2H), wherein a Rate (3R) of the rhombohedral graphite layer (3R) and the hexagonal graphite layer (2H), based on an X-ray diffraction method, which is defined by following Equation 1 is 31% or more:Rate (3R)=P3/(P3+P4)×100 Equation 1wherein P3 is a peak intensity of a (101) plane of the rhombohedral graphite layer (3R) based on the X-ray diffraction method, and P4 is a peak intensity of a (101) plane of the hexagonal graphite layer (2H) based on the X-ray diffraction method.