C - Chemistry – Metallurgy – 30 – B
Patent
C - Chemistry, Metallurgy
30
B
C30B 29/06 (2006.01) C30B 15/00 (2006.01) C30B 15/02 (2006.01)
Patent
CA 2229384
A silicon pellet feed system for use with a silicon melt furnace used to grow a silicon web. A reservoir for containing feed particles is coupled to the upper end of a feed tube. The lower end of the feed tube is positioned adjacent a pair of rotatable drive rollers driven by a motor through a coupling and a pair of gears. The rollers are mounted at an angle with respect to horizontal and the outlet end of the roller feed path is located above a delivery tube leading to the silicon melt furnace. The elements are surrounded by an enclosure having a vacuum outlet for enabling the enclosure to be evacuated to a working vacuum level and a gas inlet for enabling an inert gas to be back filled into the enclosure. The feed rate is determined by the angle of the drive rollers, the speed of the motor and the shape of the bottom end of the feed tube. The rollers are resilient to provide enhanced surface friction for the particle flow and to prevent trapped feed particles from jamming the motor.
Ebara Corporation
Ebara Solar Inc.
Fetherstonhaugh & Co.
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