| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for manufacturing silica glass, wherein a highly pure, bubble-free large flat-plate silica glass ingot can be easily manufactured in a short time. <P>SOLUTION: In the method for manufacturing silica glass, a silica glass powder is dropped from a powder feeder through the top of a rotating furnace so as to be layered in the center of a furnace bottom, heated, melted and expanded in an outer circumferential direction of the furnace to form an ingot, provided that the drop positions and the melting positions of the silica glass powder are scattered across the furnace bottom. The silica glass powder is preferably dispersed across the furnace bottom by displacing the drop position of the silica glass powder from the center of the furnace bottom and rotating one or both of the powder feeder and the furnace bottom. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
