Apparatus and Method of Use for a Top-Down Directional Solidification System
AssigneeBP Corporation North America Inc.
InventorsDavid E. Carlson, Nathan G. Stoddard
Life of this patent
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Abstract
This invention relates to an apparatus and a method of use for a top-down directional solidification system, such as for casting solar grade silicon. The invention includes a vessel with a pressure relieving device to prevent pressure build up in the liquid as the solidification front advances from a downward direction. The invention also includes a drain to remove impurities, such as the concentration in the remaining liquid phase as casting nears completion.
Claims33
A vessel for top-down directional solidification and purification suitable for casting silicon, the vessel comprising:
- a crucible;
- and
- a pressure equalizing device.
A method for top-down directional solidification and purification suitable for casting silicon, the method comprising:
- providing a molten feedstock in a vessel with a pressure equalizing device;
- solidifying from a top direction by extracting heat through a top or at least one side of the vessel;
- and
- reducing impurities within the vessel through a drain.
Dependencies are inferred from the claim text.