Composite Brake Rotor Coating for Low-Weight Thermal Stability
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Solution Overview
Problem
Existing vehicle braking components made of cast iron face challenges with high weight and limited thermal stability, as they cannot effectively manage the high friction and temperature conditions during braking.
Innovation Solution
A composite structure is formed by casting an aluminum alloy core, depositing a thermal barrier layer of high entropy alloy or yttrium stabilized zirconia using atomic layer deposition, and a wear-resistant layer of iron-aluminum-silicon-zirconium alloy using directed energy deposition, to create a lightweight and thermally insulated braking component.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cast iron is used for brake rotors or drums, then wear resistance and thermal stability are improved, but weight increases significantly
Solution Approach 1:
The patent applies composite materials by combining an aluminum alloy core with a cast iron friction layer. The aluminum alloy provides lightweight properties (reducing weight by approximately two-thirds compared to solid cast iron), while the cast iron friction layer deposited on the surface provides the necessary wear resistance and thermal stability for effective braking. This composite structure resolves the contradiction by integrating the advantages of both materials in different functional zones.
2Temperature
If cast iron is used for brake rotors or drums, then thermal stability is improved, but weight increases significantly
Solution Approach 1:
The composite structure combines aluminum alloy (lightweight, good thermal conductivity) with a cast iron friction layer (high thermal stability). The aluminum alloy core reduces overall weight by approximately two-thirds compared to solid cast iron, while the cast iron layer on the friction surface maintains thermal stability during braking operations. This resolves the contradiction by placing the thermally stable material only where heat resistance is critical.
3Weight of moving object
If aluminum alloy is used for brake rotors or drums, then weight is reduced, but wear resistance deteriorates
Solution Approach 1:
The patent uses a composite structure with an aluminum alloy core providing lightweight properties (reducing weight by approximately two-thirds compared to solid cast iron) and a cast iron friction layer deposited on the surface providing the necessary wear resistance. The aluminum alloy core is lightweight but insufficient for wear-resistant applications, while the cast iron layer restores wear resistance where it is needed for braking contact.
Solution Approach 2:
The invention applies local quality by depositing the cast iron friction layer only on the specific surfaces that require wear resistance (the friction contact areas), while the bulk of the component remains as lightweight aluminum alloy. This localized application of material properties resolves the contradiction by providing wear resistance only where necessary, rather than throughout the entire component.
4Weight of moving object
If aluminum alloy is used for brake rotors or drums, then weight is reduced, but thermal stability deteriorates
Solution Approach 1:
The composite structure combines an aluminum alloy core (lightweight) with a cast iron friction layer (thermally stable). The aluminum alloy reduces overall weight by approximately two-thirds compared to solid cast iron, while the cast iron layer on the friction surface maintains thermal stability during braking. This resolves the contradiction by placing the thermally stable material only where heat resistance is critical.
Solution Approach 2:
The invention applies local quality by depositing the thermally stable cast iron layer only on the friction surfaces that require thermal stability, while the bulk of the component remains as lightweight aluminum alloy. This localized application provides thermal stability only where necessary for friction contact, resolving the contradiction between weight reduction and thermal 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 composite structure provides enhanced wear resistance and thermal stability, maintaining the aluminum alloy core at a safe temperature while reducing weight by approximately two-thirds compared to cast iron, thus improving braking performance and efficiency.
Implementation Method 1
depositing a high entropy alloy or yttrium stabilized zirconia on the core surface to form a thermal barrier layer on the core surface
Implementation Method 2
a thermal barrier layer of high entropy alloy or yttrium stabilized zirconia... to create a lightweight and thermally insulated braking component
Implementation Method 3
depositing an iron-aluminum-silicon-zirconium alloy on the thermal barrier layer to form a wear-resistant layer on the thermal barrier layer
Data Source
AI summary
A method of manufacturing a brake rotor or brake drum having a composite structure includes casting an aluminum alloy to form a core of the brake rotor or brake drum, the core defining a core surface, depositing a high entropy alloy or yttrium stabilized zirconia on the core surface to form a thermal barrier layer on the core surface, and depositing an iron-aluminum-silicon-zirconium alloy on the thermal barrier layer to form a wear-resistant layer on the thermal barrier layer, the wear-resistant layer defining a friction surface of the brake rotor or brake drum.