Composite Brake Rotor Layers for Low-Weight Heat and Wear Resistance

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Solution Overview

Problem

Existing vehicle braking components made of cast iron are heavy and lack the necessary thermal stability and wear resistance to withstand high friction and temperature conditions during braking, limiting the potential for lightweight alternatives.

Innovation Solution

A composite structure for vehicle braking components featuring an aluminum alloy core, a thermally insulating thermal barrier layer, and a wear-resistant layer, with an adhesion layer between the core and the thermal barrier layer, utilizing materials like high entropy alloys and iron-aluminum-silicon-zirconium alloys to enhance bonding and thermal insulation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If cast iron is used for brake rotors and drums, then wear resistance and thermal stability are improved, but weight increases

Engineering Contradiction:

Improvewear resistanceVSAvoidweight

Core Design Contradiction:

StrengthVSWeight of moving object

Solution Approach 1:

The patent applies composite materials by creating a multi-layer structure consisting of an aluminum alloy core, adhesion layer, thermal barrier layer, and wear-resistant layer. This composite structure combines the lightweight advantage of aluminum alloy with the wear resistance and thermal stability of ceramic and metal layers, resolving the contradiction between weight reduction and performance maintenance.

Inventive Principle:

Principle #40Composite materials

2Temperature

If cast iron is used for brake rotors and drums, then thermal stability is improved, but weight increases

Engineering Contradiction:

Improvethermal stabilityVSAvoidweight

Core Design Contradiction:

TemperatureVSWeight of moving object

Solution Approach 1:

The composite structure uses a thermal barrier layer (ceramic or high entropy alloy) between the aluminum alloy core and the wear-resistant layer to provide thermal stability. This allows the brake component to withstand high temperatures during braking while maintaining the lightweight aluminum alloy core, thus resolving the contradiction between thermal stability and weight.

Inventive Principle:

Principle #40Composite materials

3Weight of moving object

If aluminum alloy is used for brake cores, then weight is reduced, but adhesion to thermal barrier layer deteriorates

Engineering Contradiction:

ImproveweightVSAvoidadhesion

Core Design Contradiction:

Weight of moving objectVSStrength

Solution Approach 1:

The patent introduces an adhesion layer as an intermediary between the aluminum alloy core and the thermal barrier layer. This adhesion layer (comprising metal such as titanium, chromium, molybdenum, tungsten, niobium, or tantalum) facilitates strong bonding between the aluminum alloy and the ceramic or high entropy alloy thermal barrier layer, resolving the adhesion problem while maintaining the lightweight aluminum core.

Inventive Principle:

Principle #24Intermediary (Mediator)

4Temperature

If thermal barrier layer thickness is increased, then thermal insulation is improved, but manufacturing precision requirements increase

Engineering Contradiction:

Improvethermal insulationVSAvoidthickness control

Core Design Contradiction:

TemperatureVSManufacturing precision

Solution Approach 1:

The patent specifies an optimized thickness range for the thermal barrier layer (35-138 nanometers) to achieve effective thermal insulation while maintaining manufacturability. This parameter optimization balances thermal performance with the ability to control thickness during the deposition process, resolving the contradiction between thermal insulation and manufacturing precision.

Inventive Principle:

Principle #35Parameter changes

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 a lightweight braking component with improved thermal stability and wear resistance, maintaining core temperatures below 350°C even under high braking conditions, while offering superior performance to traditional cast iron components.

Implementation Method 1

an adhesion layer between the core surface and the thermal barrier layer to facilitate adhesion between the thermal barrier layer and the brake core

Methodology Applied

Scientific EffectAdhesion: Adhesive

Implementation Method 2

a thermal barrier layer comprising a thermally insulating material

Methodology Applied

Scientific EffectThermal insulation: Thermal Insulation

Implementation Method 3

a wear-resistant layer on the thermal barrier layer. The wear-resistance layer includes an iron-aluminum-silicon-zirconium alloy

Methodology Applied

Scientific EffectWear resistance: Wear

Data Source

PatentUS12577994B2Vehicle braking components including an adhesion layer

Publication Date: 2026.03.17 GM GLOBAL TECHNOLOGY OPERATIONS LLC

AI summary

A vehicle braking component having a composite structure includes a brake core comprising an aluminum alloy, the brake core defining a core surface, a thermal barrier layer comprising a thermally insulating material, and an adhesion layer between the core surface and the thermal barrier layer to facilitate adhesion between the thermal barrier layer and the brake core. The adhesion layer includes a metal. The vehicle braking component includes a wear-resistant layer on the thermal barrier layer. The wear-resistance layer includes an iron-aluminum-silicon-zirconium alloy and defines a friction surface of the vehicle braking component.