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

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.
  1. (Wellesley, MA)
Issue Date:
OSTI Identifier:
ASE Americas, Inc. (Billerica, MA) OSTI
Patent Number(s):
US 5558712
Application Number:
Contract Number:
Country of Publication:
United States
contoured; inner; after-heater; shield; reducing; stress; growing; crystalline; bodies; apparatus; hollow; efg; process; comprising; die; top; surface; shaped; cross-sectional; configuration; shape; polygon; radiation; adjacent; surrounded; characterized; edge; defining; similar; notched; spacing; central; portions; whereby; helps; reduce; lateral; temperature; gradients; grown; central portions; radiation shield; top surface; temperature gradient; central portion; cross-sectional configuration; temperature gradients; surface shaped; inner edge; crystalline bodies; growing crystalline; hollow crystalline; growing crystal; surface shape; efg process; /117/