Quartz CVD Reactor Components With SLE Gas Flow Cavities
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Solution Overview
Problem
Existing methods for producing components for CVD reactors, such as gas inlet units, struggle to create complex designs and shapes that can withstand high temperatures and interact effectively with process gases, particularly hydrides and organometallic compounds, using conventional shaping processes like casting or machining.
Innovation Solution
The method employs selective laser-induced etching (SLE) to transform quartz material by focusing an ultra-short pulsed laser beam, allowing for the creation of complex cavity structures and components with precise gas passage openings, enabling the production of integral gas distribution bodies that can be stacked and bonded, suitable for high-temperature applications in CVD reactors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional shaping processes like casting or machining are used, then manufacturing simplicity is maintained, but complex cavity structures and precise gas passage openings cannot be produced
Solution Approach 1:
The patent replaces conventional mechanical machining and casting processes with selective laser-induced etching (SLE). The laser beam transforms quartz material through optical energy, enabling the creation of complex cavity structures and precise gas passage openings that cannot be achieved through traditional mechanical means. This substitution of mechanical systems with optical/thermal systems resolves the contradiction by achieving high manufacturing precision for complex geometries without the limitations of conventional tools.
Solution Approach 2:
The patent utilizes ultra-short pulsed laser beams with specific wavelength and duration parameters to induce selective material transformation in quartz. By controlling laser parameters (energy density, pulse duration, scanning speed) and etching fluid conditions, the process achieves precise cavities and passages. This parameter control enables complex structures to be manufactured with high precision while maintaining process feasibility.
2Temperature
If quartz components are designed for high-temperature operation above 500°C, then thermal stability is improved, but material selection and manufacturing complexity increase
Solution Approach 1:
The patent applies selective laser-induced etching to create locally optimized cavity structures within the quartz component. The laser process allows different regions of the quartz to have different cavity geometries, wall thicknesses, and surface characteristics tailored for specific gas flow requirements while maintaining overall thermal stability at high temperatures. This local quality approach enables high-temperature operation without uniformly increasing manufacturing complexity.
Solution Approach 2:
The replacement of mechanical machining with laser-induced etching enables the manufacturing of quartz components designed for high-temperature operation. The laser process can create complex internal geometries and precise passages in quartz that are thermally stable above 500°C, without the tooling limitations and thermal stresses associated with conventional high-temperature component manufacturing.
3Stability of the object's composition
If integral gas distribution bodies are produced in one piece, then structural integrity and gas flow homogeneity are improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent uses selective laser-induced etching to create integral gas distribution bodies with complex internal cavity structures in a single manufacturing process. The laser can write three-dimensional cavity networks directly into the quartz blank, creating structurally integrity components with homogeneous gas flow paths without requiring multiple assembly steps. This replaces complex mechanical machining and assembly operations with a single optical manufacturing process.
Solution Approach 2:
The laser-induced etching process creates segmented cavity structures within the integral quartz body, with gas passages distributed throughout the component. This internal segmentation of the gas distribution function within a monolithic structure achieves both structural integrity and homogeneous gas flow, avoiding the need for assembled multi-part components.
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 enables the production of quartz components with intricate designs and enhanced gas flow distribution, capable of operating above 500°C, ensuring homogeneous gas flow and compatibility with reactive gases, which cannot be achieved through traditional shaping methods.
Implementation Method 1
an ultra-short pulsed laser beam is focused at a focal point in the micrometer range... A material transformation of the quartz material takes place at the focal point of the laser beam by way of a multi-photon process
Implementation Method 2
The material thus transformed can be removed in a second process step using an etching fluid... This method is known in the art per se as SLE (selective laser-induced etching)
Implementation Method 3
The transformed material can then be removed with a fluid etchant, for example a potassium hydroxide solution
Data Source
AI summary
A component made of a quartz blank is used as a component part of a CVD reactor. At least one cavity of the component is created by selective laser etching, wherein a fluid flows through the at least one cavity. When in use, the component is heated to temperatures in excess of 500° C., and comes into contact with hydrides of the main groups IV, V or VI and/or with organometallic compounds or halogenides of elements of the main groups II, III or V.