Friction lining, method for its preparation and its use
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Solution Overview
Problem
The use of zinc and zinc alloys in friction linings for corrosion protection is environmentally harmful and leads to issues like foam formation, swelling, and complex production processes, necessitating a zinc-free alternative that provides sufficient corrosion protection.
Innovation Solution
Incorporating aluminum alloys with metals like magnesium (Mg) or titanium (Ti) into friction linings, which are less reactive than zinc alloys, forming a sacrificial anode to prevent rust and using these alloys in powder form to ensure uniform distribution and reduce adhesive corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If zinc or zinc alloys are used in friction linings for corrosion protection, then effective corrosion protection is achieved, but environmental harm and health risks increase due to heavy metal contamination
Solution Approach 1:
The patent changes the chemical composition parameter by replacing zinc-based corrosion protection agents with aluminum-based alternatives (such as Al, Al-Si, Al-Mg alloys), fundamentally altering the material system to eliminate heavy metal contamination while maintaining protective functionality
Solution Approach 2:
The patent employs aluminum powder as a sacrificial anode that is consumed during service, providing continuous corrosion protection through controlled oxidation of the aluminum rather than zinc, thereby eliminating environmental harm associated with zinc disposal
2Reliability
If zinc alloys like AlZn5 are used in friction linings, then corrosion protection is provided, but foam formation and aluminum oxide flakes appear on the lining surface
Solution Approach 1:
The patent modifies the alloy composition by using pure aluminum or aluminum alloys with specific element combinations (Al-Si, Al-Mg) instead of Al-Zn systems, changing the chemical reactivity parameters to prevent foam formation while maintaining corrosion protection
Solution Approach 2:
The patent extracts the harmful zinc element from the alloy system, using aluminum-based materials alone or in combination with other non-harmful elements, thereby eliminating the source of foam formation and surface defects
3Reliability
If zinc alloys are used in friction linings, then corrosion protection is achieved, but the friction lining swells depending on the alloy concentration
Solution Approach 1:
The patent changes the compositional parameters by replacing zinc alloys with aluminum-based materials that have different thermal and mechanical expansion characteristics, thereby maintaining dimensional stability while providing corrosion protection
4Object-affected harmful factors
If zinc-free alternatives are used in friction linings, then environmental harm is reduced, but sufficient corrosion protection must be maintained
Solution Approach 1:
The patent employs aluminum powder as a self-sacrificing corrosion protection agent that automatically protects the friction lining through galvanic corrosion mechanisms, eliminating the need for external corrosion protection systems while maintaining environmental compatibility
Solution Approach 2:
The patent uses composite material systems combining aluminum-based corrosion protection agents with friction lining materials, creating a multi-functional composite that provides both corrosion protection and friction characteristics without heavy metals
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 aluminum alloys offer effective corrosion protection, maintaining performance comparable to zinc-containing mixtures while avoiding environmental hazards, with the added benefit of reducing adhesive corrosion and allowing for continuous renewal as the friction lining wears.
Implementation Method 1
The aluminum alloys offer effective corrosion protection, maintaining performance comparable to zinc-containing mixtures
Implementation Method 2
the use of an aluminium alloy which is less reactive than, for example, AlZn5 or another zinc alloy, but which still offers sufficient corrosion protection
Data Source
AI summary
AI alloys, especially Al-magnesium or aluminum-titanium alloys, are suitable as corrosion inhibitors in friction linings for brakes and clutches and serve as a replacement for zinc-metal or zinc compounds in such linings.