SiAl Sputtered Mirror Reflective Layer
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Solution Overview
Problem
Traditional mirrors produced via wet processing, such as silvering, are expensive, environmentally unfriendly, and lack durability due to silver's susceptibility to corrosion, requiring additional protective coatings that increase production time and complexity.
Innovation Solution
A mirror with a reflective layer comprising an alloy of silicon and aluminum (SiAl) is sputter-deposited onto a glass substrate, offering high mechanical durability, thermal temperability, and environmental stability without the need for additional protective overcoats, achieved through the use of a SiAl sputtering target in an inert gas atmosphere.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If traditional wet processing (silvering) is used to produce mirrors, then high reflectance and pleasant appearance are achieved, but cost increases and environmental friendliness deteriorates
Solution Approach 1:
The patent changes the material composition parameter from traditional silver to silicon-aluminum alloy, and changes the deposition method from wet processing to sputtering. This achieves the desired reflectance while reducing cost and improving environmental compatibility, as silicon-aluminum is cheaper than silver and the sputtering process is cleaner and more controllable than wet chemistry methods.
Solution Approach 2:
The patent uses a composite silicon-aluminum alloy material instead of pure silver. The specific composition (SiAl) provides sufficient reflectance for interior applications while being more cost-effective and environmentally friendly. The composite material approach allows optimization of both optical properties and manufacturing characteristics.
2Illumination intensity
If silver is used in the reflective layer, then high reflectance is achieved, but durability deteriorates due to corrosion susceptibility
Solution Approach 1:
The patent changes the material composition from silver to silicon-aluminum alloy, fundamentally altering the chemical properties. Silicon-aluminum is inherently more resistant to corrosion and chemical degradation than silver, thereby improving durability and reliability while maintaining sufficient reflectance for interior applications.
3Reliability
If protective paint layers are applied to silver mirrors, then durability is improved, but production time and process complexity increase
Solution Approach 1:
The patent extracts and eliminates the need for protective paint layers by using silicon-aluminum material that is inherently resistant to corrosion and degradation. The sputtering process deposits a durable, protective layer directly as part of the reflective layer formation, eliminating the need for separate protective coating steps and reducing overall production time.
Solution Approach 2:
The silicon-aluminum reflective layer serves its own protective function through its inherent material properties. The sputtering process creates a dense, adherent layer that protects the underlying structure without requiring additional protective coatings, making the system self-sufficient in terms of protection.
4Ease of manufacture
If wet coating techniques are used, then reflective layers can be deposited, but environmental safety and worker safety deteriorate due to messiness and hazards
Solution Approach 1:
The patent replaces the wet chemical coating process with a physical vapor deposition (sputtering) process. This substitution eliminates the messy, hazardous chemicals associated with wet processing, while maintaining the ability to deposit reflective layers. The sputtering process occurs in a controlled vacuum environment, improving safety for workers and the environment.
Solution Approach 2:
The sputtering process is conducted in a vacuum or inert atmosphere, creating a controlled environment that eliminates the hazards of wet chemistry. The inert atmosphere prevents unwanted chemical reactions, improves worker safety, and reduces environmental impact compared to traditional wet processing methods.
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 SiAl reflective layer provides sufficient reflectance for interior applications, is cost-effective, and maintains durability during thermal bending, reducing the need for expensive protective coatings and minimizing environmental impact.
Implementation Method 1
the use of a sputtering target of or including SiAl, in order to sputter-deposit a reflective layer of or including silicon aluminum on (directly or indirectly) a glass substrate
Data Source
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AI summary
Embodiments relate to mirrors having a reflective layer of or including silicon aluminum (e.g., SiAl). The mirrors may be first surface mirrors, or second surface mirrors. The mirrors may be flat or bent in different instances, and may or may not be heat treated. In certain example instances, such mirrors may be used in interior residential, commercial, appliance, and/or other applications.