High Emissivity Coatings Using TiO2 Waste Recovery

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Solution Overview

Problem

High emissivity coating compositions using silicon carbide (SiC) as emissivity agents face degradation at high temperatures due to decomposition, leading to reduced mechanical strength and shorter lifetimes, and existing manufacturing processes are not cost-effective.

Innovation Solution

Developing thermal emissivity coatings with titanium dioxide (TiO2) as an emissivity enhancing agent, obtained from industrial waste sources, combined with ceramic borides, carbides, and nitrides for enhanced mechanical strength and cost-effectiveness, and optimizing the weight percentages of TiO2 and SiC to achieve high emissivity and adhesion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If silicon carbide (SiC) is used as emissivity agent, then emissivity enhancement performance is improved at moderate temperatures, but mechanical strength and emissivity degradation occur at high temperatures

Engineering Contradiction:

Improveemissivity enhancementVSAvoidcoating lifetime

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent changes the chemical composition parameters by replacing SiC with TiO2 as the emissivity agent. TiO2 maintains high emissivity values (0.90-0.99) across a broader temperature range including high temperatures, while improving coating mechanical strength and resistance to thermal degradation. This parameter substitution resolves the contradiction between emissivity enhancement and long-term reliability.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite coating material combining TiO2 with ceramic borides, carbides, and nitrides. This composite structure provides both high emissivity properties and enhanced mechanical strength, allowing the coating to withstand high temperature cycles without cracking or delamination, thus resolving the reliability issue.

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If conventional manufacturing processes are used, then coating production is achieved, but production costs are high

Engineering Contradiction:

Improvecoating productionVSAvoidproduction cost

Core Design Contradiction:

Ease of manufactureVSQuantity of substance

Solution Approach 1:

The patent utilizes industrial waste materials as raw inputs for coating production. By incorporating low-cost waste materials into the coating formulation, the manufacturing cost is significantly reduced while maintaining the desired coating performance characteristics.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The patent recovers and reuses industrial waste materials in the coating manufacturing process. This recovery approach converts waste into valuable coating components, reducing both production costs and environmental impact while maintaining coating quality.

Inventive Principle:

Principle #34Discarding and recovering

3Strength

If coating adhesion is improved, then coating lifetime is extended, but emissivity values may be compromised

Engineering Contradiction:

Improvecoating adhesionVSAvoidemissivity value

Core Design Contradiction:

StrengthVSUse of energy by moving object

Solution Approach 1:

The patent develops a composite coating system where TiO2 provides high emissivity (0.90-0.99) and ceramic borides, carbides, and nitrides provide enhanced adhesion and mechanical strength. The synergistic combination allows both high emissivity and strong adhesion to coexist, resolving the contradiction between these two properties.

Inventive Principle:

Principle #40Composite materials

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 coatings exhibit desirable mechanical strength and emissivity over a broad temperature range, surviving repeated temperature cycles without cracking or delamination, and demonstrate improved energy efficiency with emissivity values up to 0.99, while reducing production costs.

Implementation Method 1

Emissivity (symbolically represented as c or e) can be broadly defined as the relative ability of a surface to emit energy by radiation. More particularly, emissivity can be defined as the ratio of energy radiated by a particular material to energy radiated by a blackbody at the same temperature.

Methodology Applied

Scientific EffectThermal radiation: Thermal Radiation

Implementation Method 2

combined with ceramic borides, carbides, and nitrides for enhanced mechanical strength

Methodology Applied

Scientific EffectComposite material reinforcement: Composite Materials

Implementation Method 3

The surface transition of SiC to SiO2 was due to temperature induced decomposition of SiC bonds and the subsequent formation of SiO2. The decomposition reaction of SiC at high temperature can be illustrated as follows: SiC+O2→SiO2+CO2

Methodology Applied

Scientific EffectThermal decomposition: Decomposition (biological)

Data Source

PatentUS9587120B2High emissivity coating compositions and manufacturing processes therefore

Publication Date: 2017.03.07 SCG CHEM CO LTD

AI summary

Titanium dioxide is used as an emissivity enhancer in high emissivity coating compositions. The titanium dioxide increases the emissivity of the high emissivity coating compositions. In certain embodiments, titanium dioxide is recovered from industrial waste sources such as catalyst containing waste streams from olefin polymerization processes or re-based sources. Titanium dioxide emissivity enhancers recovered from industrial waste solution sources contribute favorably to the cost of manufacturing high emissivity coating compositions containing such enhancers.