Leybold-heraeus Gmbh & Co. Kg

Joachim Floymayr

Karl Jericho

Uwe Reimpell

Dieter Drechsel

Friedrich Bubeck

Dietrich Drechsel

An apparatus for the zone drawing of monocrystal rods comprises a hermetically sealed housing having two rod holders movably disposed rotatably and vertically one over the other within the housing. A stationary high frequency heating system is disposed between the rod holders. Each rod holder comprises one transport slide, a sliding guide and a spindle drive disposed within the housing for the independent vertical movement of the rod holders and one drive for the rotation of the rod holders.

Apparatus for the zone pulling of monocrystal rods

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.

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Hanau am Main, Germany

Joachim Floymayr