Brake Disc Steel Layer With Reduced Nickel and Carbide Coating
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Solution Overview
Problem
Brake discs made of gray cast iron or steel face issues with excessive wear and surface oxidation, leading to rust formation, and existing protective coatings tend to flake off, releasing nickel particles which can cause sensitization and are costly to produce.
Innovation Solution
A brake disc with a base layer of steel containing reduced or no nickel, combined with a protective surface coating of carbides such as tungsten carbide, chromium carbide, or titanium carbide, deposited using high-velocity techniques, to enhance wear resistance and prevent nickel particle release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional protective coatings are applied on brake discs to reduce wear and prevent oxidation, then wear resistance and corrosion protection are improved, but the coatings tend to flake off and release nickel particles
Solution Approach 1:
The invention changes the chemical composition parameters of the steel base layer by reducing nickel content from traditional levels (typically 8-12%) to reduced levels (0.5-5%), thereby eliminating the source of nickel particle release while maintaining protective coating functionality
Solution Approach 2:
The invention extracts and removes nickel from the steel base layer composition, eliminating the harmful element that causes sensitization and particle release, while retaining essential steel properties through alternative alloying elements
2Strength
If nickel is present in the steel base layer to increase strength, toughness, and heat resistance, then mechanical performance is improved, but nickel particle release and production costs increase
Solution Approach 1:
The invention changes the alloy composition parameters by reducing nickel content and compensating with alternative elements such as chromium, manganese, and molybdenum to maintain mechanical strength and heat resistance properties
Solution Approach 2:
The invention replaces expensive nickel with more cost-effective alloying elements, reducing material costs while achieving comparable mechanical performance through alternative compositional approaches
3Ease of manufacture
If gray cast iron is used for brake discs to achieve good braking performance at low cost, then manufacturing cost is reduced, but excessive wear and surface oxidation occur
Solution Approach 1:
The invention creates a composite structure consisting of a steel base layer with reduced nickel content and a protective coating layer, combining the advantages of steel (strength, toughness) with the protective benefits of coating materials to overcome the limitations of both gray cast iron and traditional steel discs
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 reduces nickel particle release, maintains thermal and mechanical performance, and decreases production resource consumption while ensuring adequate hardness and wear resistance, thus overcoming the limitations of traditional brake discs.
Implementation Method 1
The deposition of the material in particle form is obtained by the HVOF (High Velocity Oxygen Fuel) technique
Implementation Method 2
by the HVAF (High Velocity Air Fuel) technique
Implementation Method 3
by the KM (Kinetic Metallization) technique
Data Source
AI summary
A brake disc for a disc brake may have a braking band made of gray cast iron or steel, provided with two opposite braking surfaces, each of which defines at least partially one of the two main faces of the disc. The disc is provided with a base layer constituted by steel having a nickel content of at most 15% which covers at least one of the two braking surfaces of the braking band.