Brake Disc Ceramic Coating Wear Resistance
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Solution Overview
Problem
Existing brake discs made of gray cast iron suffer from high wear, corrosion, and temperature-related issues, leading to reduced performance and increased noise and vibrations during braking, with complex surface hardening processes required for improvement.
Innovation Solution
A brake disc with a base body of gray cast iron or steel coated with oxide ceramics, bound by a binder phase, providing improved wear resistance, consistent friction coefficient, and reduced corrosion, achieved through high-velocity flame spraying or plasma spraying processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a brake disc made of gray cast iron is used, then it provides good damping properties and cost-effectiveness, but it suffers from high wear, corrosion, and temperature-related issues
Solution Approach 1:
The brake disc combines gray cast iron base material with a ceramic coating layer to create a composite structure. The gray cast iron provides cost-effectiveness and damping properties, while the ceramic coating layer provides wear resistance and corrosion protection, resolving the contradiction between ease of manufacture and reliability.
2Ease of operation
If a brake disc made of gray cast iron is used, then it provides good damping properties, but it exhibits increased noise and vibrations during braking
Solution Approach 1:
The ceramic coating is applied selectively to the friction surfaces where wear and noise occur, while the gray cast iron base body retains its damping properties. This local application of different material qualities allows the brake disc to simultaneously provide damping properties and reduce noise and vibrations from the friction surfaces.
3Reliability
If complex surface hardening processes are applied to improve wear resistance, then wear protection is enhanced, but manufacturing complexity and cost increase
Solution Approach 1:
The patent replaces complex mechanical surface hardening processes with a ceramic coating application process. The ceramic coating provides wear protection through its inherent hardness and chemical stability, eliminating the need for complex surface hardening treatments and reducing manufacturing complexity.
4Reliability
If a hard coating material is applied to the friction surface, then wear resistance is improved, but the coefficient of friction becomes unstable across temperature ranges
Solution Approach 1:
The ceramic coating material is specifically selected to provide both wear resistance and stable friction characteristics across temperature ranges. The composite structure of gray cast iron with ceramic coating creates a synergistic effect where the ceramic provides hardness and temperature stability while the base material provides damping, resolving the contradiction between wear resistance and friction 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 solution results in a cost-effective, lightweight brake disc with enhanced wear resistance, reduced noise and vibrations, and improved thermal stability, preventing brake fading and eliminating the need for complex surface hardening treatments.
Implementation Method 1
achieved through high-velocity flame spraying or plasma spraying processes
Implementation Method 2
achieved through high-velocity flame spraying or plasma spraying processes
Data Source
Figure 1
AI summary
Brake disc for a vehicle, comprising a base body made of a metallic material, which has friction surfaces with a coating of a hard material comprising oxide ceramic, wherein the coating is a composite material of oxide ceramic and metal matrix in a ratio of 50-80% to 20-50%, and the ceramic is formed by Al2O3 and TiO2 in a ratio of 60-97% to 3-40% and the metal matrix is formed by Cr/Ni steel.