CVD Flange Assembly Layout for Uniform Laminar Gas Flow
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Solution Overview
Problem
Conventional chemical vapor deposition (CVD) systems face challenges in achieving uniform and laminar gas flow, often requiring long empty chambers or shower heads that increase costs and reduce efficiency.
Innovation Solution
The CVD system incorporates a first flange assembly for introducing gases and a second flange assembly for removing gases, both designed to facilitate uniform and laminar flow without the need for extensive empty chambers or internal shower heads. The flange assemblies feature outlet and inlet tubes configured to minimize turbulence, ensuring even gas distribution over the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional CVD systems use long empty chambers or shower heads to achieve uniform gas flow, then gas flow uniformity is improved, but device complexity and cost increase
Solution Approach 1:
The flange assembly is segmented into multiple outlet tubes arranged circumferentially around the central axis, each tube independently positioned to distribute gas uniformly across the substrate surface. This segmentation replaces the need for long empty chambers or shower heads by creating multiple controlled gas introduction points.
Solution Approach 2:
The outlet tubes are positioned at different radial distances from the central axis and at different heights above the substrate, creating a three-dimensional gas distribution pattern. This spatial arrangement in multiple dimensions achieves uniform gas flow without requiring extended chamber lengths.
2Manufacturing precision
If conventional CVD systems use long empty chambers to reduce turbulence, then laminar flow is improved, but productivity decreases
Solution Approach 1:
The gas flow path is pre-configured through the flange assembly structure, with inlet tubes positioned to feed gas into outlet tubes that are already optimally positioned above the substrate. This preliminary arrangement of gas introduction points eliminates the need for long empty chambers, allowing immediate deposition without extended flow paths.
Solution Approach 2:
The flange assembly acts as an intermediary structure between the gas supply and the substrate, providing a platform with integrated inlet and outlet tubes that directly distribute gas above the substrate. This intermediary flange structure replaces the need for long empty chambers by creating controlled gas distribution zones close to the substrate surface.
3Manufacturing precision
If conventional CVD systems use shower heads to distribute gas, then gas distribution uniformity is improved, but device complexity and cost increase
Solution Approach 1:
The gas distribution function is extracted from the main chamber body and consolidated into a separate flange assembly that can be positioned close to the substrate. The flange assembly contains all necessary inlet and outlet tubes, removing the need for complex internal shower head structures within the chamber.
Solution Approach 2:
The flange assembly serves multiple functions: it provides structural support, acts as a gas distribution manifold through its circumferential outlet tubes, and positions gas introduction points optimally above the substrate. This multi-functional design replaces multiple separate components (shower heads, distribution manifolds, support structures) with a single integrated assembly.
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 configuration enables the production of high-quality graphene in a compact and cost-effective manner by ensuring uniform and laminar gas flow, thereby improving the deposition process and reducing operational costs.
Implementation Method 1
chemical vapor deposition is an industrial process used to deposit a thin film of a desired material onto a substrate
Implementation Method 2
a first flange assembly and a second flange assembly for facilitating uniform and laminar flow
Data Source
AI summary
A first and a second flange assembly configured for facilitating uniform and laminar flow in a system are provided. The first flange assembly includes a first flange body configured to introduce a gas into a chamber. The first flange assembly includes a plurality of outlet tubes disposed on an interior surface of the first flange body and a plurality of inlet tubes disposed on an exterior surface of the first flange body and in fluid communication with the plurality of outlet tubes. The second flange assembly includes a second flange body configured to remove the gas from the chamber. The second flange assembly includes a plurality of through holes extending from an interior surface to an exterior surface of the second flange body and a plurality of exit tubes extending from the exterior surface of the second flange body and in fluid communication with the plurality of through holes.