Heraeus Quarzglas Gmbh & Co Kg

Frank Hoff

Steffen Zwarg

Udo Peper

Sven Schmidt

Hans-Georg Fritsche

Michael Muschler

A known method for producing a cylinder of quartz glass comprises a method step in which a porous SiObody comprising a central inner bore, a lower end and an upper end is sintered in a sintering furnace zone by zone, starting from the upper end, to obtain the quartz glass cylinder, a holding device being used by means of which the SiObody is held standing in vertical orientation during a first sintering phase and suspended in a second sintering phase. Starting therefrom, to indicate a method by means of which even heavy bodies of porous SiOcan be reliably held during sintering, it is suggested according to the invention that the holding device comprises a fusion body of quartz glass which is arranged in the area of the upper end in the inner bore and which in the course of the first sintering phase fuses with the quartz glass of the SiObody and which during the second sintering phase is in operative interaction with a holding element of the holding device and together with said element contributes to a suspended holding of the SiObody to be sintered.

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Munich, Georgia

Frank Hoff