| 摘要 |
PROBLEM TO BE SOLVED: To provide a quartz glass crucible having sufficient heat-resistant strength that prevents a crucible inner surface from peeling off and improves a yield of drawing up a silicon single crystal in drawing up the silicon single crystal.SOLUTION: A quartz glass crucible for drawing up a silicon single crystal has a two-layer structure having a round corner part 3 between a bottom part 1 of a warped shape projecting downward and a cylindrical side wall part 2. The inner layer 4 of the crucible is made of high-purity quartz powder having a content of each of Na, K, and Li of less than 0.01 wt.ppm and transparent quartz glass not containing any bubble. A part at least ranging from the upper end to the midpoint between the upper end and the lower end of the round corner part 3 of the outer layer 5 is a high-purity quartz part 6 made of the high-purity quartz powder. The bottom part 1 and the side wall part 2 as well as a part other than high-purity quartz part 6 of the corner part 3 are made of opaque quartz glass containing bubble. |
