Apparatus and method employing focussed radiative heater for con

Details Apparatus and method employing focussed radiative heater for con Apparatus and method employing focussed radiative heater for con

1990-12-17

1992-07-21

Kunemund, Robert

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

Including specific material of construction

156601, 1566171, 1566181, 1566191, 422246, B01D 900

Patent

active

051320916

ABSTRACT:
An apparatus and method employing a radiative heater for control of a shape of a peripheral edge region of a solidification interface in a Czochralski crystal pulling process are provided wherein a radiative heater element, independently controllable from a primary heater, is provided above the upper level of the melt and of the solidification interface around the periphery of the crystal, the radiative heater element being selectively controlled to influence the shape of the solidification interface at the peripheral edge region thereof, in order to eliminate problems experienced with edge downturn at the peripheral edge region of the interface.

REFERENCES:
patent: 3795488 (1974-03-01), Oliver
patent: 3998598 (1976-12-01), Bonora
patent: 4133969 (1979-01-01), Zumbrunnen
patent: 4350557 (1982-09-01), Scholl et al.
patent: 4565598 (1986-01-01), Seymour
patent: 4604262 (1986-08-01), Nishizawa
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patent: 4650540 (1987-03-01), Stoll
patent: 4654110 (1987-03-01), Morrison
patent: 4822449 (1990-04-01), Motakef
patent: 4857278 (1990-08-01), Gevelber et al.
The Suppression of Thermal Oscillations In Czochralshi Growth; Whiffin et al; Journal of Crystal Growth (10)(1971) pp. 91-96.

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