Solar Mirror Coating Stack for Heat-Tolerant Silver Reflectors
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional mirror technologies for concentrated solar power systems face issues with environmental concerns due to wet chemical waste disposal and limitations in processing high-temperature treatments, which affect the longevity and reflectivity of silver-coated glass substrates.
Innovation Solution
A reflective article comprising a transparent glass substrate with a secondary dielectric coating, a primary metallic coating, an anti-corrosion layer, and a protective coating, allowing for enhanced reflectivity and thermal processing without damaging the silver layer, while reducing environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a wet chemical process is used to deposit silver and copper layers, then the mirror achieves high reflectivity, but environmental harm increases due to chemical waste disposal
Solution Approach 1:
The invention changes the deposition method from wet chemical to vapor deposition, fundamentally altering the process parameters to eliminate liquid waste while maintaining reflective performance
Solution Approach 2:
The invention replaces the chemical wet deposition system with a physical vapor deposition system, substituting chemical reactions with physical phase transition processes to avoid harmful chemical waste
2Illumination intensity
If a silver layer is deposited using conventional wet chemistry, then the mirror achieves high reflectivity, but the silver layer cannot withstand high-temperature processing
Solution Approach 1:
The invention creates a composite structure with multiple protective layers (adhesion layer, barrier layer, protective coating) combined with the metallic reflective layer, enabling the assembly to withstand high temperatures while maintaining reflectivity
Solution Approach 2:
The invention applies protective barrier layers beforehand to cushion and protect the silver layer from thermal damage during subsequent high-temperature processing operations
3Reliability
If a copper layer is added to protect the silver layer, then corrosion resistance improves, but the copper layer cannot protect against high-temperature damage and wet chemical deposition is environmentally harmful
Solution Approach 1:
The invention replaces wet chemical copper deposition with physical vapor deposition methods, eliminating environmental harm while achieving the same protective function
Solution Approach 2:
The invention uses a composite protective structure with multiple layers (adhesion layer, barrier layer, protective coating) that collectively provide both corrosion resistance 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 solution provides a reflective article with improved durability and reflectivity, enabling higher solar energy reflection and allowing for heat-strengthening or bending of the coated glass without compromising the silver layer, thus extending the commercial life of the mirrors and minimizing environmental harm.
Implementation Method 1
A reflective article comprising a transparent substrate having a first major surface and a second major surface. A secondary reflective coating is formed over at least a portion of the second major surface and comprises one or more dielectric layers. A primary reflective coating is formed over at least a portion of the secondary reflective coating and comprises at least one metallic layer.
Implementation Method 2
A protective coating is formed over at least a portion of the primary reflective coating
Data Source
AI summary
A reflective article, such as a solar mirror, includes a highly transparent substrate having a first major surface and a second major surface. At least one reflective coating is formed over at least a portion of one of the surfaces, e.g., the second major surface (or, alternatively, the first major surface). The reflective coating includes at least one metallic layer. An encapsulation structure can be formed over at least a portion of the second reflective coating.