Insulating Support Member for Heater Deformation in Czochralski Apparatus
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Solution Overview
Problem
The Czochralski method for single-crystal manufacturing faces issues with heater deformation due to increased size, leading to heat loss, high power consumption, and environmental impact, as well as the need for additional auxiliary electrodes to prevent deformation.
Innovation Solution
A single-crystal manufacturing apparatus with a heat insulating plate supported by an insulating stationary member and an insulating support member positioned to face the lower end of the cylindrical heater, eliminating the need for auxiliary electrodes and minimizing heat loss, thereby preventing heater deformation and maintaining heat efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the heater size is increased to accommodate larger crucibles for bigger single crystal ingots, then the manufacturing capacity and single crystal diameter are improved, but the heater deforms due to its own weight and Lorentz force, causing contact with other components and electric discharge
Solution Approach 1:
The patent introduces an insulating support member as an intermediary element between the heater and the crucible/support structure. This insulating support member provides mechanical support to prevent heater deformation while maintaining electrical insulation, thus resolving the contradiction between heater size increase and heater reliability
Solution Approach 2:
The patent employs composite structural design combining insulating materials with support functionality. The insulating support member integrates both mechanical support function and electrical insulation property, allowing the heater to be supported without direct conductive contact that would cause deformation and electric discharge
2Reliability
If auxiliary electrodes are added to support the heater and prevent deformation, then the heater reliability is improved, but heat escapes through the auxiliary electrodes, increasing power consumption and reducing heat efficiency
Solution Approach 1:
The insulating support member serves as a mediator that provides mechanical support without creating thermal shortcuts. Unlike conductive auxiliary electrodes, the insulating material supports the heater while preventing heat escape, thus improving reliability without sacrificing heat efficiency
Solution Approach 2:
The patent replaces the conventional electrical/conductive support system (auxiliary electrodes) with an insulating support system. This substitution eliminates the dual function of auxiliary electrodes (support + heat conduction) by separating support function from electrical conduction, using insulating material that provides support without heat loss
3Productivity
If conventional CZ or MCZ methods are used with larger heaters, then the single crystal production capacity is improved, but the environmental impact and fabrication cost increase due to high power consumption
Solution Approach 1:
The patent converts the potentially harmful effect of heater deformation (which would cause electric discharge and heat loss) into a beneficial outcome by using the insulating support member to prevent deformation. This eliminates the need for energy-intensive corrections and maintains heat efficiency while enabling larger scale production
Solution Approach 2:
The patent changes the physical parameter of the support system from conductive to insulating material. This parameter change fundamentally alters the thermal and electrical characteristics of the support structure, enabling large heater support without the heat loss associated with conventional conductive support methods
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 solution effectively inhibits heater deformation, reduces power consumption, and lowers production costs while maintaining heat efficiency, even with large diameter heaters, suitable for manufacturing large diameter single crystal ingots.
Implementation Method 1
the insulating support member provided on the heat insulating plate can support the cylindrical heat generating portion of the heater to inhibit the heater deformation
Implementation Method 2
a heat insulating plate provided below the cylindrical heat generating portion of the heater
Implementation Method 3
a heater having a cylindrical heat generating portion that surrounds the crucible
Implementation Method 4
a polycrystalline raw material charged in a quartz crucible is heated with a cylindrical graphite heater
Implementation Method 5
in the MCZ method (the magnetic field applied Czochralski method), Lorentz force in a magnetic field may also cause the deformation
Implementation Method 6
the heat insulating plate is fixed to and supported by the heater electrode through an insulating stationary member
Data Source
AI summary
A single-crystal manufacturing apparatus for manufacturing a single crystal ingot according to the Czochralski method including: a crucible that contains a raw material melt; a heater having a cylindrical heat generating portion that surrounds the crucible; a main chamber that accommodates the heater; a heater electrode that supports the heater and supplies current to the heater; and a heat insulating plate provided below the cylindrical heat generating portion of the heater, wherein the heat insulating plate is fixed to and supported by the heater electrode through an insulating stationary member, and an insulating support member is provided on an upper surface of the heat insulating plate at a position at which the insulating support member faces a lower end of the cylindrical heat generating portion. Provided is a single-crystal manufacturing apparatus that can inhibit heater deformation and prevent deterioration of heat efficiency.