Horizontal Quartz Process Tube Support for High Temperature Stability
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Solution Overview
Problem
High-temperature quartz process tubes used in semiconductor and photovoltaic industries deform irreversibly at temperatures above 1050°C, leading to impaired heat distribution and substrate reception issues, while silicon carbide tubes are expensive and prone to short circuits due to deformation and metal contamination.
Innovation Solution
A high-temperature process chamber arrangement featuring a horizontally arranged quartz process tube supported by a thermally stable ceramic support tube with a longitudinal slot, which provides dimensional stability and absorbs thermal expansion, preventing deformation and enhancing durability and cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If quartz process tubes are used at temperatures above 1050°C, then cost-effectiveness is improved, but the process tubes deform irreversibly under temperature stress
Solution Approach 1:
A support tube made of temperature-resistant material (such as SiC or high-temperature ceramic) is introduced as an intermediary component between the heating zone and the quartz process tube. This support tube bears the mechanical load and resists thermal stress, allowing the quartz process tube to maintain its dimensional stability while operating at temperatures above 1050°C without requiring replacement of the entire tube system.
2Temperature
If silicon carbide process tubes are used at high temperatures, then temperature resistance is improved, but metal contamination and short circuit risks increase
Solution Approach 1:
The support tube acts as a mediator that provides thermal support without direct contact with the process environment. By using materials like SiC or high-temperature ceramics for the support tube, the system achieves temperature resistance above 1050°C while avoiding the metal contamination and short circuit issues associated with traditional SiC process tubes, since the support tube is structurally separated from the electrical heating elements and process atmosphere.
3Productivity
If quartz process tubes operate at high temperatures for extended periods, then productivity is improved, but irreversible deformation occurs
Solution Approach 1:
The support tube serves as a long-lived intermediary structure that maintains the mechanical integrity of the process tube system during continuous high-temperature operation. While the quartz process tube can be replaced if needed, the support tube's high temperature resistance allows it to maintain dimensional stability over extended periods, enabling continuous productivity without the irreversible deformation that would otherwise limit service life.
4Use of energy by moving object
If heating elements surround the process tube closely, then heating efficiency is improved, but contact with deformed process tubes causes short circuits
Solution Approach 1:
The support tube functions as a protective intermediary barrier between the heating elements and the process tube. It maintains a stable geometric structure that prevents direct contact between the heating elements and the process tube, even during thermal expansion or deformation. This intermediary structure preserves electrical reliability while allowing the heating elements to operate efficiently in close proximity to the process tube.
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 support tube arrangement significantly extends the service life of both the process tube and the chamber, reducing replacement costs and ensuring consistent heat distribution and substrate accommodation without deformation, while avoiding metal contamination and short circuits.
Implementation Method 1
The longitudinal slot allows the support tube to flex radially, accommodating thermal expansion of the process pipe, which may, for example, exceed that of the support tube
Implementation Method 2
The support elements and their arrangement ensure that the support tube is pre-tensioned into its closed position, thereby promoting the dimensional stability of the process tube. The process tube's own weight provides the necessary pre-tension.
Data Source
Figure 1
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AI summary
A high-temperature process chamber arrangement comprising a substantially horizontally arranged quartz process tube, a support tube at least partially surrounding the process tube, and at least two support elements that cradle the support tube below its horizontal center plane. The support tube has a longitudinal slot extending along its entire length and a higher temperature resistance than the process tube.