Vacuum Deposition Vapor Ejector Asymmetry for Coating Uniformity
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Solution Overview
Problem
Existing vacuum deposition methods for metal coatings on metallic substrates often result in heterogeneous deposition, with metal vapors accumulating unevenly, particularly on the edges of the substrate.
Innovation Solution
The method involves positioning vapor ejectors on both sides of the substrate at specific angles α and α′, ensuring that the distances between the ejectors and the substrate edges, combined with the ejector slot dimensions, satisfy specific equations to control the vapor trajectory and achieve homogeneous deposition across both sides of the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the ejector edges are positioned at the substrate edges (D1=D2=0), then the vapor jet covers the entire substrate width, but metal vapors accumulate heterogeneously on the substrate edges
Solution Approach 1:
The patent applies asymmetry by positioning the ejectors at specific angles α and α′ relative to the substrate normal, rather than symmetrically perpendicular to the substrate. This asymmetric angular positioning, combined with offset distances D1 and D2 from the substrate edges, creates a vapor trajectory that compensates for edge accumulation effects and achieves homogeneous coating distribution across the substrate surface.
2Area of stationary object
If the ejector slot extends beyond the substrate edges, then complete substrate coverage is achieved, but vapor loss and heterogeneous deposition increase
Solution Approach 1:
The patent applies local quality by optimizing the ejector slot dimensions (Le, We) and positioning parameters (D1, D2, α, α′) specifically for the substrate geometry and desired coating distribution. The slot length Le and width We are calibrated so that the vapor jet covers the entire substrate width Ws without excessive extension beyond the edges, achieving complete coverage while minimizing vapor loss through precise local parameter optimization.
3Manufacturing precision
If multiple ejectors are used on both sides of the substrate, then homogeneous deposition is improved, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the coating task into multiple ejectors positioned on both sides of the substrate. Each ejector is responsible for a specific region, with parameters (D1, D2, α, α′) optimized for its location. This segmentation allows homogeneous deposition across the entire substrate by distributing the vapor source multiple times, with each segment contributing to the overall uniform coating.
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
This approach ensures a uniform coating thickness, improving the yield and homogeneity of metal vapor deposition, resulting in a consistent and efficient coating process with enhanced corrosion protection.
Implementation Method 1
a metallic vapor is ejected through at least two vapor ejectors (3, 3′), towards both sides of the running substrate and a layer of at least one metal is formed on each side by condensation of ejected vapors
Implementation Method 2
method for continuously depositing, on a running substrate, coatings formed from at least one metal inside a vacuum deposition facility
Data Source
AI summary
A Method for continuously depositing, on a running substrate, coatings formed from at least one metal inside a vacuum deposition facility including a vacuum chamber; a substrate coated with at least one metal on both sides of the substrate having an average thickness, wherein the coating is deposited homogenously such that the maximum thickness of the coating can exceed the average thickness of 15% maximum. A vacuum deposition facility also is provided.