Infrared Heating Single Crystal Production Apparatus
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Solution Overview
Problem
The existing single crystal production methods using infrared lamps face issues such as sagging of the melting zone, high production costs due to the need for expensive laser sources, and the requirement for advanced skills to control the melting zone, which limits the production of high-quality single crystals with precise sizes and shapes.
Innovation Solution
A single crystal production apparatus and method where the seed crystal is disposed at the top and the raw material at the bottom, using an infrared heating system without a crucible, allowing for a gradual temperature gradient and eliminating the risk of sagging, thereby reducing production costs and skill requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the raw material is heated using an infrared lamp without spot heating, then the production cost is reduced and the apparatus is simpler, but the melting zone sags due to insufficient temperature gradient
Solution Approach 1:
The patent inverts the conventional heating approach by positioning the infrared lamp above the raw material rather than using spot heating from the side or below. This inverted configuration allows the infrared radiation to heat the raw material uniformly from above, creating a stable temperature gradient that prevents melting zone sagging while maintaining lower production costs compared to laser-based systems.
Solution Approach 2:
The patent changes the heating parameters by adjusting the infrared lamp power, distance from the raw material, and ambient temperature conditions. These parameter modifications enable the infrared lamp to create sufficient temperature gradients for stable melting zone formation without requiring expensive laser equipment, thus resolving the contradiction between cost and reliability.
2Reliability
If spot heating is performed using a laser beam, then the temperature gradient is steep and sagging is prevented, but the production cost increases due to expensive laser sources
Solution Approach 1:
The patent replaces expensive, complex laser sources with more affordable infrared lamps that can be easily replaced or adjusted. This substitution maintains the essential function of creating a stable temperature gradient while significantly reducing production costs, making the technology more accessible for both research and industrial applications.
Solution Approach 2:
The patent substitutes the mechanical/optical complexity of laser beam focusing and positioning with a simpler infrared lamp system that uses radiative heating. This replacement eliminates the need for complex optical components and precision positioning mechanisms, thereby reducing costs while maintaining melting zone stability through optimized infrared radiation patterns.
3Stability of the object's composition
If the raw material is heated uniformly by infrared lamp, then the temperature distribution is even, but the melting zone becomes too long causing sagging to seed crystal
Solution Approach 1:
The patent applies local quality control by positioning the infrared lamp to create concentrated heating zones rather than uniform heating throughout the entire raw material. This localized heating approach ensures that the temperature gradient is steepest at the melting zone interface, preventing the melting zone from extending too far and causing sagging to the seed crystal, while maintaining overall temperature distribution stability.
Solution Approach 2:
The patent employs preliminary action by pre-positioning the infrared lamp at an optimized distance and angle before heating begins. This preliminary configuration ensures that the heating pattern creates an appropriately limited melting zone length from the start, preventing sagging issues before they can occur during the crystal growth process.
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 high-quality single crystals with larger diameters at a lower cost, reducing the risk of sagging and the need for advanced skills, making it suitable for both research and mass production.
Implementation Method 1
forming a melting zone by a heating part (4) having an infrared generating part (41a to 41d)
Implementation Method 2
having a plurality of spheroidal mirrors (42a to 42d) as reflecting parts
Data Source
AI summary
A single crystal production apparatus (and a single crystal production method) is configured to produce a single crystal by approaching a raw material M gripped by a raw material grip portion, and a seed crystal S gripped by a seed crystal grip portion by disposing the raw material grip portion and the seed crystal grip portion mutually in a vertical direction and approaching both of them each other, and forming a melting zone M1 by making a portion melted by heating the raw material M by a heating part in contact with the seed crystal S, and cooling the melting zone, wherein the heating part has an infrared generating part, and the seed crystal grip portion is disposed at a vertically top position, and the raw material grip portion is disposed at a vertically bottom position.