公开(公告)号：EP2799597A4

公开(公告)日：2015-08-19

申请号：EP12861985

申请日：2012-10-31

申请人： SUMCO CORP

发明人： SUDO TOSHIAKI ,  SATO TADAHIRO ,  KITAHARA KEN ,  YOSHIOKA TAKUMA ,  KISHI HIROSHI

IPC分类号： C30B29/06 ,  C03B19/09 ,  C03B20/00 ,  C30B15/10

CPC分类号： C30B15/10 ,  C03B19/095 ,  C30B11/002 ,  C30B29/06 ,  C30B35/002 ,  Y10T117/1032

摘要： Buckling of a vitreous silica crucible 12 or inward fall of a sidewall 15 is effectively suppressed. The vitreous silica crucible 12 includes the cylindrical sidewall 15 having an upward-opening rim, a mortar-shaped bottom 16 including a curve, and a round portion 17 connescting the sidewall 15 and the bottom 16. In the vitreous silica crucible 12, the per-unit area thermal resistance in the thickness direction of the sidewall 15 is higher than that of the round portion 17.