Segmented Crystal Growth Crucible Lid Reduces Fabrication Waste
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Solution Overview
Problem
The existing methods for fabricating crucible lids in the Czochralski crystal growth method result in significant waste and low yield due to the removal of a unitary annular ring from a larger blank sheet, requiring excessive effort for minimal output.
Innovation Solution
Forming arcuate sector-shaped portions that are coupled together to create a planar annular lid structure, reducing waste by minimizing the surface area of the fabrication blank that needs to be removed and allowing for welding to form a unitized body with optional additional weldment lines for reinforcement and heat transfer modification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a unitary annular ring is removed from a larger blank sheet to form a crucible lid, then the lid structure is simple and easy to manufacture, but significant fabrication waste is generated and yield is low
Solution Approach 1:
The annular lid is divided into multiple arcuate sector-shaped portions that are fabricated separately and then joined together. This segmentation allows each portion to be cut more efficiently from the blank sheet, reducing waste material while maintaining the complete annular structure when assembled.
Solution Approach 2:
The invention recovers value from the fabrication process by arranging arcuate sectors in patterns that minimize waste, and the remaining material can be more effectively reused or recycled compared to traditional unitary annular ring fabrication methods.
2Ease of manufacture
If a unitary annular ring is removed from a larger blank sheet, then fabrication process is straightforward, but fabrication yield is low
Solution Approach 1:
By segmenting the lid into multiple arcuate portions, the fabrication process can produce multiple usable components from a single blank sheet or from more efficiently utilized blanks, thereby increasing overall production yield despite adding an assembly step.
Solution Approach 2:
The invention transitions from a two-dimensional annular ring concept to a three-dimensional assembly of multiple arcuate sectors that can be arranged in various patterns (including undulating patterns), allowing more efficient use of the blank sheet area and increased yield.
3Loss of substance
If multiple arcuate sector portions are coupled together to form the annular lid, then fabrication waste is reduced and yield increases, but manufacturing complexity increases
Solution Approach 1:
The lid is segmented into multiple arcuate portions that are joined together, creating a structured assembly approach that reduces waste while the modular nature simplifies quality control and manufacturing processes compared to producing a single large unitary piece.
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 significantly reduces fabrication waste and increases the yield of usable lid components while maintaining the structural integrity and thermal properties necessary for crystal growth applications.
Implementation Method 1
The arcuate sector-shaped portions may be formed and removed from a lid fabrication blank with less waste than when unitary annular lids are formed and removed from a similarly sized fabrication blank. The arcuate sector-shaped portions may be arrayed in an undulating pattern on the fabrication sheet.
Implementation Method 2
At least two of the arcuate sector portions are oriented in abutting relationship to form at least a portion of a generally planar annular body. The at least two oriented arcuate sector portions are coupled together along the respective abutting portions to form a larger unitized arcuate sector.
Data Source
AI summary
A lid for a crystal growth chamber crucible is constructed by forming arcuate sector-shaped portions and coupling them in abutting relationship, for example by welding, to form an annular profile fabricated lid. The arcuate sector-shaped portions may be formed and removed from a lid fabrication blank with less waste than when unitary annular lids are formed and removed from a similarly sized fabrication blank. For example, the sector-shaped portions may be arrayed in an undulating pattern on the fabrication sheet.