发明申请
US20110315072A1 VITREOUS SILICA CRUCIBLE AND METHOD OF MANUFACTURING THE SAME, AND METHOD OF MANUFACTURING SILICON INGOT 有权
耐热二氧化硅溶液及其制造方法以及制造硅胶的方法

VITREOUS SILICA CRUCIBLE AND METHOD OF MANUFACTURING THE SAME, AND METHOD OF MANUFACTURING SILICON INGOT
摘要:
Provided is a vitreous silica crucible which can suppress inward sagging and buckling of the sidewall effectively even when time for pulling silicon ingots is extremely long. According to the present invention, provided is a vitreous silica crucible for pulling a silicon single crystal, wherein the crucible has a wall comprising, from an inner surface toward an outer surface of the crucible, a transparent vitreous silica layer having a bubble content rate of less than 0.5%, a bubble-containing vitreous silica layer having a bubble content rate of 1% or more and less than 50%, a semi-transparent vitreous silica layer having a bubble content rate of 0.5% or more and less than 1.0% and having an OH group concentration of 35 ppm or more and less than 300 ppm.
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