Copper-Free Brake Friction Material With Stainless Steel Fibers
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Solution Overview
Problem
Existing friction materials for automotive brakes face challenges in being asbestos-free, heavy metal-free, and copper-free while maintaining comparable braking performance to materials that contain these substances, as stringent environmental and health regulations demand their elimination.
Innovation Solution
A friction material composition comprising a fibrous base with stainless steel fibers, metallic titanates, zirconia, and solid lubricants like tin sulfides, without copper or its compounds, along with a phenolic resin binder, which provides improved wear resistance and braking stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If copper and copper compounds are used in friction materials, then wear resistance and braking performance are improved, but environmental pollution and health risks increase
Solution Approach 1:
The patent removes copper and copper compounds from the friction material composition entirely, extracting the harmful substance while maintaining performance through alternative materials including stainless steel fibers, organic fibers, and specific inorganic fillers that provide equivalent tribological properties without environmental damage
Solution Approach 2:
The patent modifies the compositional parameters by replacing copper-based wear resistance mechanisms with alternative material systems, specifically adjusting the ratios of stainless steel fibers (10-30% by weight), organic fibers (40-60% by weight), and inorganic fillers (10-30% by weight) to achieve comparable friction and wear characteristics without copper
2Reliability
If asbestos is used as fibrous material, then wear resistance is improved, but health safety deteriorates
Solution Approach 1:
The patent completely removes asbestos from the fibrous material composition, extracting this carcinogenic substance and replacing it with a combination of stainless steel fibers providing structural integrity and organic fibers such as aramid, carbon, or polyimide that deliver equivalent or superior wear resistance without health hazards
Solution Approach 2:
The patent employs a composite fibrous structure combining stainless steel fibers (10-30% by weight) with organic fibers (40-60% by weight), creating a synergistic material system where the stainless steel provides heat resistance and structural strength while the organic fibers contribute to wear resistance and friction stability, collectively replacing asbestos functionality without its toxic properties
3Reliability
If heavy metals are used in friction materials, then braking capacity is improved, but environmental compatibility worsens
Solution Approach 1:
The patent removes all heavy metals from the friction material composition, extracting substances like lead, cadmium, and chromium that compromise environmental compatibility, while maintaining braking capacity through optimized combinations of stainless steel fibers, organic binders, and environmentally benign inorganic fillers such as barium sulfate and calcium carbonate
Solution Approach 2:
The patent transforms the material composition parameters by eliminating heavy metal content entirely and adjusting the proportions of alternative materials, specifically setting organic binder content at 15-30% by weight and inorganic filler content at 10-30% by weight, to achieve equivalent braking performance through non-toxic, environmentally compatible substance systems
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 solution achieves braking performance comparable to copper-containing materials, with reduced environmental impact and health risks, as demonstrated by bench tests showing stable friction and reduced oil consumption during braking.
Implementation Method 1
a fibrous base comprising together with inorganic and/or organic fibers from 1% to 10% by volume of stainless steel fibers
Implementation Method 2
from 0% to 10% by volume of solid lubricants, such as tin sulfides, like SnS and SnS2. It is also desirable to include graphite and/or coke in the composition
Implementation Method 3
graphite and molybdenum bisulfide improve the resistance to wear
Implementation Method 4
The binder is a thermosetting polymer, usually phenolic-resin based
Implementation Method 5
a friction material composition comprising a fibrous base with stainless steel fibers, metallic titanates, zirconia
Data Source
AI summary
Asbestos-free organic friction material, in particular for producing brake pads and shoes for vehicles made up of a composition or mixture having a fibrous base, a filler, and an organic binder. The composition is completely free of copper and copper compounds or alloys and includes in the fibrous base, together with inorganic and/or organic fibers, from 1% to 10% by volume, calculated relative to the total volume of the composition, of stainless steel fibers.