公开(公告)号：EP3006606A4

公开(公告)日：2017-03-01

申请号：EP13886011

申请日：2013-05-31

Applicant: SUMCO CORP

Inventor： SUDO TOSHIAKI ,  KITAHARA KEN ,  AIBA AKIHIRO ,  OUSYUYA KAZUSHI ,  YOSHIDA FUMIE ,  HINOOKA MAKIKO ,  KITAHARA ERIKO ,  SATO TADAHIRO

IPC: C30B15/10 ,  C03B19/09 ,  C30B29/06 ,  C30B35/00

CPC classification number: C30B15/10 ,  C03B19/095 ,  C30B29/06 ,  C30B35/002 ,  Y02P40/57

Abstract: The present invention provides a vitreous silica crucible which inhibits a deformation even when used under a high temperature condition for a long time, and a method for manufacturing the same. The vitreous silica crucible comprises: a substantially cylindrical straight body portion having an opening on the top end and extending in a vertical direction, a curved bottom portion, and a corner portion connecting the straight body portion with the bottom portion and a curvature of which is greater than that of the bottom portion, wherein, the vitreous silica crucible comprises a transparent layer on the inside and a bubble layer on the outside thereof, a compressive stress layer in which compressive stress remains in the inner surface side of the transparent layer, and a tensile stress layer in which tensile stress remains and is adjacent to the compressive stress layer at a gradual rate of change of stress.