Rotating Disk Silica Powder Dispersion for Crucible Manufacturing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The rotary mold method for manufacturing silica glass crucibles faces challenges in forming a stable silica powder layer at a desired position and thickness due to the reliance on operator experience and issues with powder collapse under spray pressure, which can introduce metal impurities and affect the quality of silicon single crystals.
Innovation Solution
An apparatus and method that utilize a rotating disk within the mold to disperse silica powder evenly across the inner wall surface, adjusting the powder's direction and angle of dispersion to ensure uniform coverage, while controlling the disk's position and speed to stabilize the layer formation and reduce impurity incorporation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If silica powder is sprayed onto the inner wall surface of the mold to form a silica powder layer, then the layer formation speed increases, but the material powder collapses under spray pressure
Solution Approach 1:
A rotating disk is introduced as an intermediary component between the powder supply system and the mold inner wall. The disk receives sprayed powder and uses its rotation to disperses it uniformly across the wall surface, preventing direct impact collapse while maintaining high formation speed. The disk acts as a mediator that transforms the concentrated spray flow into distributed powder deposition.
Solution Approach 2:
The powder deposition process is segmented into two stages: first, the rotating disk receives and collects the sprayed powder; second, the rotating disk disperses the accumulated powder across the mold wall. This segmentation separates the high-velocity spray input from the uniform deposition output, resolving the contradiction between speed and uniformity.
2Productivity
If the spray quantity of silica powder is increased to form a layer in a short period of time, then the productivity increases, but the collapse of material powder becomes notable
Solution Approach 1:
The rotating disk serves as a buffer and mediator between the high-quantity powder supply and the mold wall. It collects the abundant powder flow and redistributes it uniformly through rotation, preventing localized collapse while maintaining high overall deposition rates. The disk absorbs the excess powder temporarily and releases it in a controlled manner.
3Device complexity
If the silica powder layer is formed by relying on operator experience, then the process simplicity is maintained, but the manufacturing precision deteriorates
Solution Approach 1:
The rotating disk system is self-regulating and does not require operator intervention to maintain proper powder layer thickness. The disk's rotation automatically distributes the powder uniformly, and the system self-adjusts to maintain consistent deposition patterns. This eliminates reliance on operator experience while keeping the device relatively simple.
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 allows for the stable and efficient formation of a silica powder layer in a short period, reducing metal impurities and improving the quality of silica glass crucibles, which in turn enhances the quality of silicon single crystals produced using the CZ method.
Implementation Method 1
a rotating disk (420) that changes, to one toward the inner wall surface side at the fall position, the direction in which the dropped silica powder (200) moves, while also widening the angle at which the silica powder (200) disperses toward the inner wall surface at the fall position
Data Source
AI summary
An apparatus for manufacturing a silica glass crucible includes a rotating means for rotating a mold and a supply means for feeding a silica powder inside the mold, wherein the supply means has a feeding part for delivering the silica powder in a manner releasing it to fall to a position away from the inner wall surface of the mold inside the mold, and a dispersing part for changing, to one toward the inner wall surface side, at a fall position, the direction in which the silica powder fed from the feeding part moves, while also widening an angle at which the silica powder disperses toward the inner wall surface at the fall position. The apparatus is intended to allow a silica powder layer to be stably formed in the mold in a short period of time.