Bicycle Brake Pad Chemical Coupling via Intermetallic Combustion Synthesis
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Solution Overview
Problem
Conventional bicycle brake pads with metal composite friction members face challenges in coupling the friction member and support member due to high thermal conductivity, requiring additional components and mechanical coupling methods like swage-coupling, which are complex and costly.
Innovation Solution
A bicycle brake pad with a friction member and support member chemically coupled using intermetallic compounds formed through combustion synthesis, where the friction member includes compounds like Cu—Ti intermetallics and the support member includes Al, allowing for inorganic chemical coupling and mechanical coupling via heat-induced reactions, reducing the need for external heating and additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If mechanical coupling methods like swage-coupling are used to couple the friction member and support member, then the coupling strength is sufficient, but the structure becomes complex and additional components are required
Solution Approach 1:
The patent replaces mechanical coupling methods (swage-coupling) with chemical coupling through intermetallic compound formation. The friction member and support member are chemically bonded via diffusion bonding that creates intermetallic compounds at the interface, eliminating the need for mechanical fasteners or complex coupling structures while maintaining strong bonding.
Solution Approach 2:
The patent changes the bonding mechanism from mechanical to chemical by controlling thermal and compositional parameters. By heating the assembly to specific temperatures and controlling the composition of the friction member (including reactive metals like Al, Ti, Cu), the system enables diffusion bonding that forms strong intermetallic bonds between the friction member and support member.
2Device complexity
If adhesive agents are used to couple the friction member and support member, then the coupling process is simplified, but the bonding strength is insufficient due to high thermal conductivity of the friction member
Solution Approach 1:
The patent replaces adhesive bonding with direct chemical bonding through intermetallic compound formation. Instead of using organic adhesives that fail under high thermal conductivity conditions, the friction member itself contains reactive metals that form strong inorganic intermetallic bonds with the support member through diffusion bonding.
Solution Approach 2:
The friction member is designed as a composite material containing reactive metals (Al, Ti, Cu, Ni, Zn) embedded in the friction material matrix. These reactive metals serve as bonding agents that form intermetallic compounds with the support member, combining the functions of friction material and bonding agent in a single composite structure.
3Manufacturing precision
If external heating and additional coupling agents are used, then the coupling process is controlled, but manufacturing costs increase
Solution Approach 1:
The friction member contains reactive metals that automatically form intermetallic bonds with the support member when heated during normal brake operation or a simple heating process. The system uses its own thermal energy and embedded reactive materials to create the bond, eliminating the need for external heating equipment and additional coupling agents, thereby reducing manufacturing complexity and cost.
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
This approach simplifies the brake pad structure, enhances braking performance, improves wear resistance, and reduces manufacturing costs by eliminating the need for external heating and additional coupling agents, while maintaining strong chemical and mechanical bonds between the friction and support members.
Implementation Method 1
the first intermetallic compound is produced by performing combustion synthesis on metal materials including two selected from a group consisting of Cu, Ti, Zn, Ni, and Al
Implementation Method 2
The first support member and the second support member are mechanically coupled to each other by the projection of the first support member that enters the recess of the second support member when combustion synthesis of the first intermetallic compound produces heat that softens or melts the projection
Data Source
AI summary
A bicycle brake pad includes a friction member and a first support member. The friction member includes a first intermetallic compound. The friction member and the first support member are, at least partially, chemically coupled to each other.