Smart Mirror Coating Durability via SiAl Alloy Sputtering
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Solution Overview
Problem
Magnetron sputtering vapor deposition (MSVD) coatings for smart mirrors are soft and lack endurance properties due to low temperature processes, and high temperature fabrication methods result in coatings with poor film quality and thickness control.
Innovation Solution
A coated article comprising a substrate with a metal functional layer formed by magnetron sputtering vapor deposition using silicon aluminum or silicon cobalt alloys, optionally with a protective and dielectric layer, to enhance mechanical and chemical durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If magnetron sputtering vapor deposition is used to deposit coatings, then materials quality and uniformity of thickness are improved, but mechanical durability and chemical endurance are worsened due to soft coating properties from low temperature process
Solution Approach 1:
The patent applies composite materials by combining multiple layers with different functions: a base coating layer for optical properties and an overcoat layer for mechanical durability. The overcoat layer is specifically designed to provide hardness and chemical resistance, creating a composite structure that achieves both precision deposition benefits and enhanced durability.
Solution Approach 2:
The patent changes process parameters by introducing a two-stage deposition process with different power levels. The base layer is deposited at lower power to maintain quality and uniformity, while the overcoat layer is deposited at higher power to achieve the required hardness and mechanical properties, thus resolving the contradiction between precision and durability.
2Strength
If high temperature fabrication process is used, then mechanical and chemical durability is improved, but film quality and thickness control are worsened
Solution Approach 1:
The patent segments the fabrication process into distinct stages: base layer deposition at low temperature for precision and overcoat deposition at high temperature for durability. This segmentation allows each layer to be optimized for its specific function without compromising the other, resolving the contradiction between temperature-dependent properties.
Solution Approach 2:
The patent applies preliminary action by first depositing the base layer with precise thickness control at low temperature, then subsequently adding the overcoat layer for durability enhancement. This sequential approach ensures that precision requirements are met before durability enhancement, preventing degradation of film quality.
3Reliability
If pyrolytic spray process is used, then mechanical and chemical durability is improved, but film quality and thickness uniformity are worsened with rough coating surface
Solution Approach 1:
The patent introduces an intermediary base layer that serves as a foundation for the final durable coating. This base layer is deposited with high precision using magnetron sputtering, providing a smooth, uniform surface that mediates between the substrate and the subsequent overcoat, ensuring both quality and durability.
Solution Approach 2:
The patent applies local quality by giving different regions of the coating structure different properties: the base layer is optimized for smoothness and uniformity, while the overcoat layer is optimized for durability. Each layer performs its specific function locally, resolving the contradiction between surface quality and coating durability.
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 durable and chemically resistant coating with improved mechanical properties, suitable for smart mirrors and architectural applications, while maintaining transparency and reflectivity.
Implementation Method 1
The metal functional layer is formed by a process comprising depositing, by a magnetron sputtering vapor deposition method, the metal alloy
Data Source
AI summary
A coated article includes a substrate and a metal functional layer over at least a portion of the substrate. The metal functional layer includes a metal alloy selected from the group consisting of a silicon aluminum alloy and a silicon cobalt alloy. Another coated article includes a glass substrate and a coating over at least a portion of the substrate. The coating includes a dielectric layer, a metal functional layer, and a protective layer. The present invention also provides methods of making coated articles.