| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To produce inexpensively each quartz glass molding having various outer diameters. <P>SOLUTION: A quartz glass material 16 is placed on the center of circular bottom plate 12 made of carbon having a thickness of 1 cm and a diameter of 50 cm, and on the outside thereof, each one end of plate materials 14 is combined sa many as eight successively on a position 8 cm separated from the end of the plate material of polygonal adjacent sides, and fastened by a string-like body made of carbon fibers, to thereby compose an outer cylinder. Then, the quartz glass material 16 is installed in the outer cylinder, moved into an electric furnace, and heated and melted for 2 hours at 1,800°C in a nitrogen gas atmosphere, to thereby obtain a quartz glass molding 16a which is a regular octagonal pillar whose one side is 8 cm, and whose average height is 7.9 cm. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
