Graphene Brake Pad Friction Material for High-Temperature Stability
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Solution Overview
Problem
Existing friction materials for brake pads face challenges in maintaining a high coefficient of friction over time, especially at increased temperatures, due to the need for asbestos-free and copper-free formulations.
Innovation Solution
A friction material comprising inorganic and/or organic and/or metallic fibers, an organic binder, a carbonaceous friction modifier made of graphene flakes or scales, and fillers or abrasives, where graphene replaces traditional graphite content to enhance thermal conductivity and tribological characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional graphite is replaced with graphene to improve thermal conductivity and tribological characteristics, then the coefficient of friction stability and wear resistance are improved, but the manufacturing complexity and cost increase due to the need for specialized graphene dispersion and processing techniques
Solution Approach 1:
The patent changes the physical and chemical parameters of the friction material by replacing graphite with graphene, which has superior thermal conductivity and tribological properties. This parameter change improves coefficient of friction stability and wear resistance while managing the associated manufacturing complexity through controlled dispersion processes
Solution Approach 2:
The patent creates a composite friction material by integrating graphene into the friction material matrix alongside other components such as binders, fillers, and traditional friction modifiers. This composite approach allows the benefits of graphene to be realized while distributing the manufacturing complexity across multiple material interactions
2Object-affected harmful factors
If copper content is reduced or eliminated to meet environmental regulations, then environmental safety and health benefits are improved, but the coefficient of friction decays over time especially at increased temperatures
Solution Approach 1:
The patent extracts copper and other harmful substances from the friction material formulation to eliminate environmental and health hazards. This extraction is compensated by introducing graphene and other benign materials that maintain or improve friction stability, especially under high-temperature conditions
Solution Approach 2:
The patent changes the compositional parameters by eliminating copper and introducing graphene, which fundamentally alters the thermal and tribological behavior of the friction material. This parameter change enables the material to maintain friction stability without relying on copper-based friction modifiers
3Temperature
If graphene is added to friction materials to improve thermal conductivity and wear resistance, then high-temperature performance is improved, but the dispersion uniformity and mixing difficulty worsen due to graphene's tendency to aggregate
Solution Approach 1:
The patent introduces dispersants and surface treatment agents as intermediaries between graphene and the friction material matrix. These intermediaries prevent graphene aggregation and ensure uniform dispersion throughout the composite, enabling effective heat dissipation and high-temperature performance
Solution Approach 2:
The patent utilizes the porous and layered structure of graphene to create a distributed network within the friction material. This porous structure facilitates uniform distribution of heat and stress while the layered morphology prevents excessive aggregation, maintaining both thermal performance and compositional 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 use of graphene in friction materials improves the stability and performance of brake pads by maintaining a consistent coefficient of friction and reducing wear, even under high-temperature conditions, while being environmentally friendly and safe for human health.
Implementation Method 1
graphene replaces traditional graphite content to enhance thermal conductivity and tribological characteristics
Implementation Method 2
a carbonaceous friction modifier made of graphene flakes or scales
Implementation Method 3
The use of graphene in friction materials improves the stability and performance of brake pads by maintaining a consistent coefficient of friction and reducing wear
Data Source
AI summary
An asbestos-free friction material includes inorganic and/or organic and/or metallic fibers, at least one binder, at least one friction modifier or lubricant, at least one filler or abrasive and a carbonaceous material constituted by a microstructure. The microstructure is in the form of flakes or scales of micrometric planar dimensions and of nanometric thickness consisting of a substantially pure graphene mono- or multilayers, preferably pre-blended with at least part of the organic binder.