Abstract:
Device for crucible-free zone melting a crystalline rod, particularly a semiconductor rod, includes two induction heating coils annularly surrounding the crystalline rod, and driving means for adjusting the position of the induction heating coils relative to one another in a direction transverse to the rod axis. Method of using the device includes relatively moving the induction heating coils away from one another transversely to the rod axis at the junction of a seed crystal with one end of the rod so as to fuse the seed crystal to the rod, relatively moving the induction heating coils on the one hand and the rod on the other hand along the axis of the rod and simultaneously relatively displacing the induction heating coils gradually toward one another in a direction transverse to the rod axis in conformity with an outwardly flaring conical portion of the rod extending from the seed crystal, until the induction heating coils substantially coaxially surround the main cylindrical portion of the rod.
Abstract:
Apparatus comprising means for capturing carbon-containing vapor emanating from carbon-containing substances in the high vacuum environment and in the equipment for producing the high vacuum in the environment, and adsorbent means for adsorbing the carboncontaining vapor.
Abstract:
METHOD OF CRUCIBLE-FREE ZONE MELTING A CRYSTALLINE ROD WHICH COMPRISES ROTATING A PAIR OF SPACED AND SUBSTANTIALLY VERTICALLY ALIGNED END HOLDERS SUPPORTING A CRYSTALLINE ROD THEREBETWEEN, HEATING THE ROD WITH AN ANNULAR HEATING DEVICE SURROUNDING THE ROD TO A TEMPERATURE AT WHICH A MOLTEN ZONE IS FORMED IN THE ROD DIVIDING THE ROD INTO A SUPPLY ROD PORITION BEING SUPPLIED TO THE MELT IN THE MOLTEN ZONE AND A ROD PORTION RESOLIDIFYING FROM THE MELT, RELATIVELY DISPLACING THE END HOLDERS AND THE HEATING DEVICE IN THE DIRECTION OF THE ROD AXIS AT A GIVEN RELATIVE SPEED SO THAT THE RESOLIDIFYING ROD PORTION HAS A THICKNESS OF PREDETERMINED NOMINAL VALUE, AND LATERALLY DISPLACING THE END HOLDER FOR THE SUPPLY ROD PORTION OUT OF VERTICAL ALIGNMENT WITH THE OTHER END HOLDER.
Abstract:
APPARATUS FOR REFINING A ROD ACCORDING TO THE FLOATINGZONE MELTING TECHNIQUE INCLUDES ROTARY SHAFT MEANS ADAPTED TO CARRY AND ROTATE A ROD DURING SUBJECTION THEREOF TO THE FLOATING-ZONE MELTING TECHNIQUE, PLAY-FREE WORMDRIVE MEANS OPERATIVELY CONNECTED TO THE ROTARY SHAFT MEANS FOR ROTATING THE LATTER, CARRIAGE MEANS CARRYING THE ROTARY SHAFT MEANS, BALL-BEARING GUIDE MEANS GUIDING THE CARRIAGE MEANS FOR MOVEMENT, AND ROTARY BALL-BEARING SPINDLE MEANS OPERATIVELY CONNECTED TO THE CARRIAGE MEANS FOR DISPLACING THE LATTER, SO THAT THE ROD IS MAINTAINED FREE OF MECHANICAL VIBRATIONS DURING TREATMENT OF THE ROD ACCORDING TO THE FLOATING-ZONE MELTING TECHNIQUE.
Abstract:
METHOD OF CRUCIBLE-FREE ZONE MELTING A CRYSTALLINE ROD WHICH COMPRISES SUCCESSIVELY PASSING ALONG THE ROD IN THE AXIAL DIRECTION THEREOF AN ADVANCE MELTING ZONE FORMED IN THE ROD TO A DEPTH SMALLER THAN THE RADIAL THICKNESS OF THE ROD AND A SUBSEQUENT MELTING ZONE FORMED IN THE ROD AND EXTENDING ACROSS THE ENTIRE CROSS SECTION OF THE ROD.
Abstract:
Apparatus for producing monocrystals by potless zone melting, in which the monocrystal, setting out from a seed crystal, passes through a neck and a transitional zone into the main part of the monocrystal. A chamber is provided for the formation of a vacuum or a protective gas atmosphere plus a heating device for the production of the melting heat, driving means for the mechanical movements necessary for the crystal formation, a mounting for the seed crystal, and a supporting device which is applicable to the monocrystal beyond the neck, and a plurality of gripping bodies distributed about the circumference and applicable to the monocrystal radially on its substantially cylindrical surface the gripping bodies are disposed such that they first perform a radial approach to the monocrystal until a virtually force-free contact is made therewith, adapting themselves to the surface geometry and position of the monocrystal, whereupon the gripping force is increased and the gripping bodies are locked.
Abstract:
Apparatus for producing monocrystals by potless zone melting, in which the monocrystal, setting out from a seed crystal, passes through a neck and a transitional zone into the main part of the monocrystal. A chamber is provided for the formation of a vacuum or a protective gas atmosphere plus a heating device for the production of the melting heat, driving means for the mechanical movements necessary for the crystal formation, a mounting for the seed crystal, and a supporting device which is applicable to the monocrystal beyond the neck, and a plurality of gripping bodies distributed about the circumference and applicable to the monocrystal radially on its substantially cylindrical surface the gripping bodies are disposed such that they first perform a radial approach to the monocrystal until a virtually force-free contact is made therewith, adapting themselves to the surface geometry and position of the monocrystal, whereupon the gripping force is increased and the gripping bodies are locked.
Abstract:
Device for crucible-free zone melting a crystalline rod, end-supported by holders, one of the holders being rotatable about the longitudinal axis thereof, includes an induction heating coil disposed between the end holders and coaxial to the longitudinal axis, the induction heating coil being energizable for heating a molten zone formed in the crystalline rod and comprising at least one winding disposed in a single plane, and a connecting lead to the induction heating coil, the connecting lead being formed as a partial winding and disposed outside the plane on a side thereof facing the rotatable holder; and method of operating the device.
Abstract:
Device for supporting a crystalline rod during crucible-free zone melting ich comprises a zone-drawing apparatus, a rotating shaft in said apparatus, means for fastening the shaft in the apparatus, a screw bolt mounted for rotation with the shaft, the top end of the screw bolt having a bore for receiving a seed crystal, two or more swivel arms mounted adjacent to the bore and capable of being opened and closed, a ring coaxially surrounding the bolt and means for vertically moving the ring.