Laser-Clad Brake Disk Coating for Wear-Resistant Friction Brakes
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Solution Overview
Problem
Existing friction brakes for motor vehicles, particularly rail vehicles, require improvements in wear resistance and durability without the need for a separate corrosion protection layer, while maintaining cost-effectiveness and long maintenance intervals, especially with the preference for laser coating techniques.
Innovation Solution
The use of a wearing layer composed of specific alloy combinations such as carbon (C), vanadium (V), chromium (Cr), and tungsten carbide (WC) or niobium (Nb), with optimized mixing ratios and thickness, applied through thermal spraying or buildup welding, which enhances wear resistance and maintains the braking performance of uncoated gray cast iron brake disks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a wearing layer is applied by thermal spraying or buildup welding to improve wear resistance, then abrasion resistance is improved, but the manufacturing complexity and cost increase
Solution Approach 1:
The patent applies parameter changes by optimizing the alloy composition of the wearing layer with specific ranges of carbon (0.5-2.0 wt%), silicon (1.0-3.0 wt%), manganese (0.5-2.0 wt%), and other elements to achieve high abrasion resistance. The application method parameters are also optimized, specifying thermal spraying or buildup welding with controlled layer thickness of 0.5-3.0 mm, thereby resolving the contradiction between improved wear resistance and manufacturing complexity through parameter optimization.
2Object-affected harmful factors
If the thickness of the brake disk is decreased to reduce CO2 emissions, then environmental impact is improved, but the structural integrity and heat dissipation capacity may deteriorate
Solution Approach 1:
The patent employs composite materials by applying a wearing layer composed of iron alloy with specific compositional ranges onto a brake disk base material. This composite structure allows the brake disk to maintain reduced thickness for lower CO2 emissions while the specialized wearing layer provides enhanced abrasion resistance and protects the underlying structure, thereby resolving the contradiction between environmental benefits of thinner disks and structural integrity requirements.
3Reliability
If a separate corrosion protection layer is added to protect the brake disk, then corrosion resistance is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent applies the universality principle by designing a wearing layer with multi-functional properties that simultaneously provide abrasion resistance, corrosion resistance, and appropriate friction characteristics. The wearing layer composition, containing iron as base with controlled amounts of carbon, silicon, manganese, and other alloying elements, serves multiple protective functions, thereby eliminating the need for a separate corrosion protection layer and reducing overall device complexity while maintaining comprehensive protection.
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 proposed solution achieves significant reduction in wear values and friction values comparable to uncoated gray cast iron brake disks, with improved abrasion resistance and reduced fine dust emission, while ensuring efficient heat dissipation and maintaining the desired braking effect, thus extending the service life and reducing environmental impact.
Implementation Method 1
which is applied on the friction surface (5) by thermal spraying or buildup welding
Implementation Method 2
which is applied on the friction surface (5) by thermal spraying or buildup welding, especially by laser buildup welding
Implementation Method 3
achieves significant reduction in wear values and friction values comparable to uncoated gray cast iron brake disks, with improved abrasion resistance and reduced fine dust emission, while ensuring efficient heat dissipation and maintaining the desired braking effect
Data Source
AI summary
A friction brake is provided for motor vehicles such as road vehicles, rail vehicles and utility vehicles, the friction brake including a friction brake body, especially a grey iron brake disk, the friction surface of which has been provided with an antiwear layer of an iron alloy that has been applied to the friction surface by thermal spraying or deposition welding, especially by laser deposition welding. The antiwear layer includes, as alloy constituents, predominantly iron (Fe) as residual constituent, and also carbon (C), vanadium (V), and optionally chromium (Cr) and/or niobium (Nb) and/or molybdenum (Mo) and/or tungsten carbide (WC).