Movable Insulation Plug for Crucible Temperature Gradient Control
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Solution Overview
Problem
Conventional crystal growth furnaces face challenges in maintaining a precise temperature gradient within the crucible to control crystal solidification effectively, leading to potential defects and inefficiencies in crystal growth.
Innovation Solution
A furnace system with a movable insulation plug and heat exchanger setup that allows for adjustable radiative thermal coupling between the crucible and the environment, enabling precise control of heat extraction and temperature gradient management through a through hole in the housing, ensuring homogeneous heat control and reduced energy loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional cooled crucible shaft and movable temperature shields are used to cool the bottom section, then a temperature gradient can be provided, but the device complexity increases and manufacturing precision becomes difficult to maintain
Solution Approach 1:
The invention extracts the cooling function from the crucible shaft and temperature shields, replacing it with a dedicated cooling device positioned below the crucible. This separation simplifies the overall structure by removing complex internal cooling mechanisms from the crucible assembly while maintaining effective temperature gradient control through the extracted cooling system.
Solution Approach 2:
The invention introduces an intermediary cooling device positioned between the crucible and the furnace bottom. This mediator transfers heat away from the crucible bottom through a controlled interface, enabling precise temperature gradient management without requiring complex internal cooling structures within the crucible itself.
2Manufacturing precision
If cooled shaft or temperature shields are used, then controlled solidification can be achieved, but the manufacturing precision and reliability deteriorate due to complex structure
Solution Approach 1:
By extracting the cooling function to a separate dedicated device, the invention eliminates the reliability issues associated with complex internal cooling structures in the crucible shaft. The simplified crucible design without internal cooling channels reduces potential failure points while the external cooling device can be independently optimized and maintained.
Solution Approach 2:
The cooling device is designed to be independently controllable and adjustable, allowing it to self-regulate the temperature gradient based on process requirements. This self-service capability enhances reliability by reducing dependence on complex interconnected systems while maintaining precise control over crystal solidification.
3Loss of energy
If heat extraction from furnace bottom is implemented, then energy efficiency improves, but the temperature control precision worsens
Solution Approach 1:
The cooling device applies heat extraction locally at the crucible bottom region rather than uniformly across the entire furnace bottom. This localized cooling approach allows precise control of the temperature gradient in the critical crystal growth zone while maintaining higher temperatures in other furnace regions, thereby improving both energy efficiency and temperature control precision simultaneously.
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 solution allows for controlled and flexible thermal extraction, enhancing crystal growth quality by maintaining a stable temperature gradient, reducing defects, and enabling efficient production of multiple crystal components simultaneously.
Implementation Method 1
allows for adjustable radiative thermal coupling between the crucible and the environment
Implementation Method 2
enabling precise control of heat extraction and temperature gradient management
Data Source
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AI summary
The present invention relates to a furnace system for growing crystals. The furnace system comprises a crucible (110) for growing a crystal and a furnace (120) comprising a housing (121) having an inner volume (Vi). The housing (121) comprises a through hole (124) connecting the inner volume (Vi) with an environment of the housing (121). An insulation plug (101) is movably insertable into the through hole (124) for controlling a heat extraction out of the crucible (110) by radiation, wherein the insulation plug (101) is free of a force transmitting contact with the crucible (110).