Contoured inner after-heater shield for reducing stress in growing crystalline bodies
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United States of America Patent
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Sep 24, 1996
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N/A
app pub date -
Nov 4, 1994
filing date -
Nov 4, 1994
priority date (Note) -
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Abstract
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.
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