发明名称 |
Vitreous silica crucible |
摘要 |
The present invention provides a vitreous silica crucible which can suppress buckling and sidewall lowering of the crucible and the generation of cracks. According to the present invention, a vitreous silica crucible is provided for pulling a silicon single crystal having a wall, the wall including a non-doped inner surface layer made of natural vitreous silica or synthetic vitreous silica, a mineralizing element-maldistributed vitreous silica layer containing dispersed island regions each containing a mineralizing element, and wherein the vitreous silica of the island regions and the vitreous silica of a surrounding region of the island regions is a combination of mineralizing element-doped natural vitreous silica and non-doped synthetic vitreous silica, or a combination of mineralizing element-doped synthetic vitreous silica and non-doped natural vitreous silica, and the inner surface layer is made of vitreous silica of a different kind from that of the island region. |
申请公布号 |
US8936684(B2) |
申请公布日期 |
2015.01.20 |
申请号 |
US201113308344 |
申请日期 |
2011.11.30 |
申请人 |
Japan Super Quartz Corporation |
发明人 |
Sudo Toshiaki;Kishi Hiroshi;Kitahara Ken |
分类号 |
C30B15/10;C03B19/09 |
主分类号 |
C30B15/10 |
代理机构 |
Christensen O'Connor Johnson Kindness |
代理人 |
Christensen O'Connor Johnson Kindness |
主权项 |
1. A vitreous silica crucible for pulling a silicon single crystal having a wall, the wall comprising, from an inner surface side toward an outer surface side of the crucible, a non-doped inner surface layer made of natural vitreous silica or synthetic vitreous silica, a mineralizing element-maldistributed vitreous silica layer containing dispersed island regions, each containing a mineralizing element, and wherein the vitreous silica of the island regions and the vitreous silica of a surrounding region of the island regions is a combination of mineralizing element-doped natural vitreous silica and non-doped synthetic vitreous silica, or a combination of mineralizing element-doped synthetic vitreous silica and non-doped natural vitreous silica, and the inner surface layer is made of vitreous silica of a different kind from that of the island regions. |
地址 |
Akita-shi JP |