Global to push GA events into
skip to main content

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.
Inventors:
 [1]
  1. (Wellesley, MA)
Issue Date:
OSTI Identifier:
870608
Assignee:
ASE Americas, Inc. (Billerica, MA) OSTI
Patent Number(s):
US 5558712
Application Number:
08/334,753
Contract Number:
NREL-ZM-2-11040-3
Country of Publication:
United States
Language:
English
Subject:
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/

Similar records in DOepatents and OSTI.GOV collections: