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Contoured inner after-heater shield for reducing stress in growing crystalline bodies

United States Patent

*** EXPIRED ***
September 24, 1996
View the Complete Patent at the US Patent & Trademark Office
An apparatus for growing hollow crystalline bodies by the EFG process, comprising an EFG die having a top surface shaped for growing a hollow crystalline body having a cross-sectional configuration in the shape of a polygon having n faces, and a radiation shield adjacent to and surrounded by the top end surface of the die, characterized in that the shield has an inner edge defining a similar polygon with n sides, and the inner edge of the shield is notched so that the spacing between the n faces and the n sides is greatest between the central portions of the n faces and the n sides, whereby the greater spacing at the central portions helps to reduce lateral temperature gradients in the crystalline body that is grown by use of the die.
Kalejs; Juris P. (Wellesley, MA)
ASE Americas, Inc. (Billerica, MA)
08/ 334,753
November 4, 1994
This invention was made under Department of Energy Subcontract No. NREL-ZM-2-11040-3.