Ceramic Thermal Barrier Coating for Exhaust Aftertreatment Heat Management

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Solution Overview

Problem

Conventional exhaust aftertreatment systems face challenges with heat transfer management, as fiber-based insulation is prone to migration, manufacturing defects, and poor temperature reduction, while air gaps offer inadequate insulation, leading to inefficiencies and potential component failure.

Innovation Solution

Application of a ceramic thermal barrier coating, comprising a nickel-based bond coat and a zirconia-based top coat, to exhaust aftertreatment components such as oxidation catalysts, particulate filters, and reductant injector assemblies, reducing heat transfer and eliminating the need for fiber-based insulation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If fiber-based insulation is used in exhaust aftertreatment components, then heat transfer reduction is achieved, but the insulation material is prone to migration and manufacturing defects

Engineering Contradiction:

Improveheat transferVSAvoidinsulation material stability

Core Design Contradiction:

Loss of energyVSReliability

Solution Approach 1:

The patent replaces fiber-based mechanical insulation with a ceramic coating system applied through thermal spray or dip-coating processes. This substitution eliminates the physical migration issues inherent in fiber-based materials while maintaining thermal insulation functionality through a bonded ceramic layer that adheres to the component surface.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent employs composite material structure consisting of a metallic substrate (aluminum or steel) coated with ceramic material (such as alumina or zirconia). This composite approach combines the thermal conductivity benefits of metal with the thermal insulation properties of ceramic, creating a reliable insulation system without the defects of fiber-based materials.

Inventive Principle:

Principle #40Composite materials

2Loss of energy

If fiber-based insulation is used in exhaust aftertreatment components, then heat transfer reduction is achieved, but manufacturing defects occur

Engineering Contradiction:

Improveheat transferVSAvoidinsulation quality

Core Design Contradiction:

Loss of energyVSManufacturing precision

Solution Approach 1:

The patent replaces manual or mechanical fiber insulation installation with automated coating processes such as thermal spray or dip-coating. These processes provide consistent, defect-free application that eliminates the manufacturing defects associated with fiber-based insulation installation while ensuring complete coverage of complex geometries.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the physical state and application method of the insulation material from discrete fiber bundles to a sprayable or dip-coatable ceramic slurry or powder. This parameter change enables controlled, uniform application with precise thickness control, eliminating the variability and defects inherent in fiber-based insulation manufacturing.

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If air gaps are used for insulation in exhaust aftertreatment components, then manufacturing is simplified, but temperature reduction is inadequate

Engineering Contradiction:

Improveinsulation implementationVSAvoidsurface temperature reduction

Core Design Contradiction:

Ease of manufactureVSTemperature

Solution Approach 1:

The patent uses a composite structure combining metallic substrate with ceramic coating layer. This composite material provides superior thermal insulation performance compared to air gaps alone, achieving significant surface temperature reduction (up to 33% according to the patent) while maintaining a streamlined component design without complex air gap structures.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent applies ceramic coating specifically to the outer surface of exhaust aftertreatment components where heat dissipation to surrounding structures occurs. This localized application of high-performance insulation material provides maximum temperature reduction at the critical heat transfer interface, achieving better thermal management than uniform air gaps would provide.

Inventive Principle:

Principle #3Local quality

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 ceramic thermal barrier coating significantly reduces surface temperatures by up to 33% compared to uncoated components, simplifying manufacturing, reducing costs, and ensuring complete coverage on complex geometries, thereby enhancing operational efficiency and reliability.

Implementation Method 1

A ceramic thermal barrier coating is applied to a surface of the exhaust aftertreatment component

Methodology Applied

Scientific EffectThermal Insulation: Thermal Insulation

Data Source

PatentUS10508584B2Use of insulating paint on exhaust aftertreatment system components

Publication Date: 2019.12.17 CUMMINS EMISSION SOLUTIONS INC

AI summary

An apparatus includes an exhaust aftertreatment component. According to various embodiments, the exhaust aftertreatment component is any of a diesel oxidation catalyst, a diesel particulate filter, a decomposition reactor tube, a selective catalytic reduction device, and a reductant injector assembly. The apparatus also includes a ceramic thermal barrier coating applied to a surface of the exhaust aftertreatment component. The surface may, for example, be an outer wall of a housing of the exhaust aftertreatment component.