Czochralski Inner Shield Segmented Support Thermal Efficiency
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Solution Overview
Problem
Conventional single-crystal manufacturing apparatuses using graphite inner shields suffer from reduced thermal efficiency due to heat conduction to the supporting member, leading to increased manufacturing time and costs.
Innovation Solution
The apparatus features an inner shield supported at three or more points with rod-shaped members, minimizing heat transfer area to the supporting member, and using carbon or carbon composite materials for enhanced strength and reduced cross-sectional areas, with a heat insulator surrounding the inner shield to further improve heat retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the inner shield is made of graphite with high emissivity and its entire lower end surface contacts the supporting member, then the inner shield provides good heat radiation insulation, but heat escapes into the supporting member due to heat conduction, reducing thermal efficiency
Solution Approach 1:
The contact area between the inner shield and supporting member is segmented into discrete supporting points rather than continuous contact. The inner shield is supported at three or more supporting points, creating isolated contact locations that minimize heat conduction pathways while maintaining structural support.
Solution Approach 2:
The harmful heat conduction pathway is extracted by removing the continuous contact between the inner shield and supporting member. Only the essential supporting function is retained at discrete points, eliminating the unnecessary heat transfer area while preserving structural integrity.
2Strength
If the inner shield is supported by a supporting member with large contact area, then the inner shield is well-supported structurally, but heat transfer area to the supporting member increases, reducing thermal efficiency
Solution Approach 1:
The support structure is segmented into discrete supporting points distributed across the inner shield. This segmentation provides adequate structural support through multiple contact points while minimizing the total heat transfer area compared to continuous contact.
Solution Approach 2:
The supporting member has different properties at different locations: it provides full structural support at the supporting points where contact occurs, but has minimal or no contact area elsewhere. This local differentiation optimizes both structural integrity and thermal efficiency.
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 design enhances thermal efficiency, reduces electric power consumption, and decreases single-crystal manufacturing time, thereby lowering costs and improving productivity.
Implementation Method 1
an inner shield for insulating heat radiated from the heater
Implementation Method 2
heat escapes into the supporting member supporting the inner shield due to heat conduction
Data Source
AI summary
A single-crystal manufacturing apparatus according to the Czochralski method, including: a crucible that contains a raw material; a main chamber configured to accommodate a heater for heating and melting the raw material; and a pulling chamber configured to pull and accommodate a grown single crystal, the pulling chamber being continuously provided above the main chamber; an inner shield provided between the heater and the main chamber and for insulating heat radiated from the heater, and a supporting member for supporting the inner shield from below. The inner shield is supported at three or more supporting points contacting the supporting member, and a lower end of the inner shield except at the supporting points does not contact the supporting member.