Abstract:
Furnace assembly providing a working volume the pressure in which may range from 10 5 torr to 100 atmospheres. Controlled temperatures up to 4,000* C. are attainable. Two load-bearing rods extending into the furnace are rotated and moved along their vertical axes over a wide speed range. Means are provided continuously to indicate the precise position of each rod, to monitor the operation within the furnace by TV, and to control the operations within the furnace from a remote location.
Abstract:
Furnace assembly providing a working volume the pressure in which may range from 10 5 torr to 135 atmospheres. Controlled temperatures up to 3,000*C are attainable. A crystal-pulling rod and a crucible-supporting rod extend into the furnace. The crystal-pulling rod is rotated and driven translationally through an extended excursion in a slow crystal-pulling mode and relatively fast positioning mode; while the crucible support rod is rotated and driven translationally through a relatively short excursion in a crucible positioning mode. The main furnace housing is lifted up and swung away to permit ready access to the crucible holding zone for interchange of rf coils and crucible holders as well as for easy safe removal of large crystals suspended from the pulling rod. Means are provided continuously to indicate the precise position of the crystal-pulling rod, to monitor the operation within the furnace by TV, and to control the operations within the furnace from a remote location.