QUARTZ GLASS CRUCIBLE FOR SILICON SINGLE CRYSTAL PULLING OPERATION AND PROCESS FOR MANUFACTURING THE SAME

摘要

A quartz glass crucible for silicon single crystal pulling operation that by a simple arrangement, attains prevention of any collapse onto the inside at a superior edge of straight trunk part; and a process for manufacturing the same. The quartz glass crucible for silicon single crystal pulling operation having a straight trunk part and a bottom part, is characterized in that at least the straight trunk part is provided with a gradient of fictive temperature so that the fictive temperature on the outermost side thereof is 25°C or more lower than the fictive temperature on the innermost side thereof.