METHOD FOR PRODUCING A MOLDED BODY FROM AN ELECTRICALLY MELTED SYNTHETIC QUARTZ GLASS
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United States of America Patent
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Issued Date -
Feb 26, 2015
app pub date -
Mar 26, 2013
filing date -
Apr 5, 2012
priority date (Note) -
Abandoned
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Abstract
In a known method for producing a mold body from synthetic quartz glass, quartz glass granules (15) are heated in an electrically heated melt container (31) to form a softened quartz glass mass (57), and the softened quartz glass mass (57) is formed to the mold body. In order to achieve an advantageous melting behavior also in continuous melting processes, it is proposed according to the invention that synthetically produced quartz glass granules (15) of granular particles are used in which helium is enclosed, wherein said quartz glass granules (15) are produced by granulating pyrogenically produced silicic acid with the formation of a SiO2 granulate (9) and subsequent vitrification of the SiO2 granulate in a rotary kiln (1), which has a rotary tube (6) which is at least partially made of a ceramic material, and under a treatment gas that contains at least 30% by volume of helium.
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