Textured Brake Disk Coating for Wear and Corrosion Resistance
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Solution Overview
Problem
Brake disks face issues with wear and corrosion, leading to reduced service life and aesthetic concerns, particularly in visible applications like motorcycles, where uneven wear can cause chattering and affect the vehicle's appearance.
Innovation Solution
A wear and corrosion-resistant coating is applied to brake disks with a three-dimensional surface texture, achieved through various surface finishing techniques such as bead blasting, sanding, and etching, combined with a multi-layer coating of amorphous and crystalline materials like titanium and titanium nitride, to enhance both functionality and appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a standard smooth coating is applied to brake disks, then the coating process is simple and cost-effective, but the brake disk lacks aesthetic appeal and shows wear more obviously
Solution Approach 1:
The brake disk surface is pre-treated with blasting or etching to create a three-dimensional texture before coating application. This preliminary surface preparation enables the subsequent coating to trap particles and control light reflection, creating an aesthetically pleasing appearance while maintaining a relatively simple overall manufacturing process
Solution Approach 2:
The surface treatment creates localized three-dimensional features (peaks and valleys) on the brake disk surface. These local structural variations are then coated to produce different light reflection characteristics in different areas, achieving an aesthetically pleasing appearance without requiring complex overall surface treatment
2Productivity
If the brake disk surface is left untreated, then manufacturing is simpler and faster, but wear and corrosion resistance is reduced
Solution Approach 1:
A relatively simple blasting or etching treatment is performed on the brake disk surface before coating to create a three-dimensional texture. This preliminary action significantly improves wear and corrosion resistance of the subsequent coating while adding minimal time to the manufacturing process
Solution Approach 2:
The coating system uses composite material structures including amorphous and crystalline phases (such as amorphous titanium and crystalline titanium nitride) to achieve superior wear and corrosion resistance. This composite approach provides enhanced protection without requiring complex manufacturing processes
3Reliability
If a thick coating is applied to maximize wear resistance, then protection is improved, but the coating becomes more prone to cracking and spalling
Solution Approach 1:
The coating is divided into multiple thin layers with different compositions and properties rather than applying a single thick coating. This segmentation into layered structures prevents cracking and spalling while maintaining superior wear resistance through the combined properties of each layer
Solution Approach 2:
The coating system employs composite material structures with amorphous and crystalline phases in multiple layers. This composite approach allows each layer to be optimized for specific functions (adhesion, wear resistance, stress management) while working together to prevent cracking and spalling
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 extends the service life of brake disks beyond 100,000 vehicle miles, reduces maintenance costs, and provides an aesthetically pleasing appearance by combining wear resistance with a unique surface texture that traps particles and controls light reflection.
Implementation Method 1
aesthetically pleasing by combining wear resistance with a unique surface texture that traps particles
Implementation Method 2
controls light reflection
Data Source
AI summary
A brake disk including carbon steel, stainless steel or a ceramic composite material and coated with a coating material that is wear and corrosion resistant and when applied properly allows for the coated surface to have a variety of “textured” appearances. For example, the coated surface can be made to look like woven carbon fiber. The aesthetically pleasing, wear and corrosion resistant coating overlays wear surfaces and portions of the brake disk that will be, in many cases, visible when the brake disk is installed on the vehicle. The coating includes a first layer of a metal, such as a pure titanium metal, and a second layer that can include a Nitride, Boride, Carbide or Oxide of the metal used in the first layer. The coating can be applied using a physical vapor deposition source such as a cathodic arc source with a controlled gas atmosphere.