Patent ID: 7716948
Filing Date: 2010-05-18
Classification: C03B,C30B,Y10T

Abstract:
1. A method for making a fused glass crucible for holding molten silica having an upper surface that defines a melt line, the method comprising: rotating a crucible mold having a generally horizontal surface for forming a bottom portion of the crucible and a generally upright surface for forming a wall portion of the crucible; depositing doped silica grain on an upper portion of the upright surface of the rotating crucible mold; limiting the upper portion on which doped silica grain is deposited to substantially at such a melt line; depositing bulk silica grain on a lower portion of the upright surface and on the doped silica grain; depositing bulk silica grain on the generally horizontal surface of the mold to form the bottom portion of the crucible; and fusing substantially all of the grain.