Apparatus for manufacturing stria-free, bubble-free and homogeneous quartz-glass plates

A method of manufacturing practically stria-free, bubble-free, and homogeneous quartz-glass plates of any desired configuration and with a surface area that exceeds the cross-section of the full circular quartz-glass cylinder that is employed as a starting material. The cylinder is continuously lowe...

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Hauptverfasser: SIMMAT, FRITZ, KREUTZER, KARL
Format: Patent
Sprache:eng
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Beschreibung
Zusammenfassung:A method of manufacturing practically stria-free, bubble-free, and homogeneous quartz-glass plates of any desired configuration and with a surface area that exceeds the cross-section of the full circular quartz-glass cylinder that is employed as a starting material. The cylinder is continuously lowered into a furnace shell flooded with an inert gas, in which it is heated to a flowing temperature in the range of 1700 DEG to 1900 DEG C. until some of the quartz-glass flows off into a graphite crucible. The crucible is preferably clad with zirconium-oxide.