Silver IR Reflecting Layer with Titanium Oxide Interface
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Solution Overview
Problem
Existing coated articles with silver IR reflecting layers have specific resistivity that limits their thermal properties, such as emittance and U-value, which are desirable to improve for better performance in window applications.
Innovation Solution
Incorporating a titanium oxide layer over the IR reflecting layer, which can be oxidation graded, to reduce the specific resistivity of the silver layer, thereby enhancing the thermal properties of the coated article.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a silver IR reflecting layer is used in coated articles, then thermal properties such as low emittance and low U-value are achieved, but the specific resistivity of the silver layer limits further improvement of thermal properties
Solution Approach 1:
A titanium oxide layer is introduced as an intermediary between the silver IR reflecting layer and the outer metal oxide layer. This intermediary layer modifies the electrical and thermal properties at the interface, reducing the specific resistivity of the silver layer from 5.43 micro-ohms·cm to lower values, thereby improving thermal properties without compromising the IR reflecting functionality
Solution Approach 2:
The patent creates a composite structure combining silver, titanium oxide, and metal oxide layers. This composite material system leverages the high IR reflectivity of silver while the titanium oxide and metal oxide components reduce specific resistivity and improve overall thermal performance, achieving a synergistic effect that none of the individual materials could accomplish alone
2Reliability
If the thickness of the silver IR reflecting layer is increased to improve thermal properties, then emittance and U-value are reduced, but visible transmission is compromised
Solution Approach 1:
The patent changes the optical and electrical parameters of the coating system by introducing titanium oxide and metal oxide layers. These layers modify the overall optical properties, allowing the silver layer to be thinner while maintaining or improving thermal properties. The titanium oxide layer specifically alters the electrical conductivity and optical transmission characteristics, enabling decoupling of thermal performance from visible transmission
3Reliability
If the specific resistivity of the IR reflecting layer is reduced to improve thermal properties, then emittance and U-value are improved, but the complexity of the coating structure increases
Solution Approach 1:
The titanium oxide layer is applied locally over the silver IR reflecting layer, specifically targeting the interface region where electrical and thermal property modification is needed. This localized approach reduces specific resistivity where it matters most without requiring complete restructuring of the entire coating system, thereby limiting the increase in overall complexity
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 titanium oxide layer reduces the specific resistivity of the IR reflecting layer, leading to improved thermal properties like lower emittance and U-value, allowing for increased visible transmission or the use of a thicker silver layer without compromising visible transmission.
Implementation Method 1
Incorporating a titanium oxide layer over the IR reflecting layer, which can be oxidation graded, to reduce the specific resistivity of the silver layer
Data Source
AI summary
A coated article is provided with at least one infrared (IR) reflecting layer. The IR reflecting layer may be of silver or the like. In certain example embodiments, a titanium oxide layer is provided over the IR reflecting layer, and it has been found that this surprisingly results in an IR reflecting layer with a lower specific resistivity (SR) thereby permitting thermal properties of the coated article to be improved.