Friction Material Composition for Lubricated Wear Resistance
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Solution Overview
Problem
Existing friction materials face challenges in achieving excellent friction stability, wear-resistance, noise-resistance, pressure-resistance, and temperature-resistance, especially in applications requiring reduced lubrication and high operating temperatures.
Innovation Solution
A friction material comprising a resin-impregnated fibrous base material with a specific composition of aramid fibers, polyacrylonitrile-based carbon fibers, carbon particles, mineral fibers, and diatomaceous earth, which provides enhanced porosity, strength, and thermal conductivity, allowing for effective frictional engagement and lubricant management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If friction materials use traditional compositions, then manufacturing is simpler, but friction stability and wear-resistance are insufficient
Solution Approach 1:
The friction material uses a composite composition including aramid fibers, polyacrylonitrile-based carbon fibers, carbon particles, mineral fibers, and diatomaceous earth. This multi-component composite structure provides enhanced friction stability, wear-resistance, and mechanical strength while managing lubricant interaction effectively.
Solution Approach 2:
The invention specifies precise parameter ranges for each component: aramid fibers (10-40 parts by weight), polyacrylonitrile-based carbon fibers (5-20 parts by weight), carbon particles (5-15 parts by weight), mineral fibers (5-15 parts by weight), and diatomaceous earth (30-60 parts by weight). These controlled parameter changes optimize the balance between friction stability and material complexity.
2Temperature
If friction materials are designed for high temperature resistance, then temperature-resistance improves, but manufacturing cost increases
Solution Approach 1:
Diatomaceous earth is used as a porous material providing high surface area and lubricant retention capacity. This allows the friction material to manage heat through lubricant reservoirs and evaporation mechanisms, achieving temperature-resistance without requiring expensive high-temperature alloys or complex cooling systems.
Solution Approach 2:
The friction material incorporates diatomaceous earth and carbon components that provide self-lubrication and heat dissipation properties. The material manages its own thermal regulation through lubricant evaporation and heat distribution, reducing the need for additional active cooling components and lowering overall manufacturing costs.
3Strength
If friction materials use high fiber content, then strength and wear-resistance improve, but noise-resistance deteriorates
Solution Approach 1:
The friction material uses different fiber types with specific local functions: aramid fibers provide structural strength and wear-resistance, while softer mineral fibers and diatomaceous earth particles are distributed throughout to provide noise damping. This local quality differentiation allows simultaneous achievement of high strength and noise-resistance.
Solution Approach 2:
The composite structure combines hard fibers (aramid, carbon) for strength with softer components (mineral fibers, diatomaceous earth) for noise suppression. The interaction between these different material phases creates a structure that resists wear while dampening vibration and noise generation during operation.
4Reliability
If friction materials are designed for reduced lubrication, then friction stability improves, but wear-resistance worsens
Solution Approach 1:
Diatomaceous earth provides a porous structure that retains lubricant within the friction material matrix. This allows the material to maintain stable friction characteristics through controlled lubricant release while the porous structure also provides wear protection by trapping abrasive particles and reducing direct surface contact.
Solution Approach 2:
The diatomaceous earth and carbon particles act as intermediary elements between the friction surfaces. These components provide a transfer layer that stabilizes friction while protecting the underlying structure from wear, effectively mediating between the need for friction stability and wear prevention.
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 friction material exhibits improved wear-, noise-, pressure-, and temperature-resistance, maintaining stable frictional engagement and reducing shuddering and degradation, while being economical to produce and suitable for various automotive and industrial applications.
Implementation Method 1
a fibrous base material impregnated with the resin... enhanced porosity... lubricant management
Implementation Method 2
polyacrylonitrile-based carbon fibers... carbon particles... thermal conductivity... temperature-resistance
Implementation Method 3
friction materials are often useful for applications where opposing surfaces engage to transmit mechanical and/or thermal energy
Data Source
AI summary
A friction material includes a resin and a fibrous base material impregnated with the resin. The fibrous base material has a single ply, and includes a plurality of aramid fibers present in a first amount, a plurality of polyacrylonitrile-based carbon fibers present in a second amount that is less than the first amount, a plurality of carbon particles present in a third amount that is less than or equal to the second amount, a plurality of mineral fibers present in a fourth amount that is less than or equal to the second amount, and diatomaceous earth present in a fifth amount that is greater than the first amount. A friction member for operatively contacting a lubricated surface includes a substrate and the friction material. The friction material defines a first surface bonded to the substrate and a second surface configured for operatively contacting the lubricated surface.