Patent ID: 7695787

Claim:
A silica glass crucible used for pulling silicon single crystal, comprising: a silica glass crucible having a wall part, an open diameter, an inner surface, and an outer surface; and a graphite susceptor adhered to the outer surface of the silica glass crucible; wherein at least an outer surface of the wall part of the crucible is covered with fine grooves having a length of from 10 μm, to 200 μm, a width of from 10 μm to 30 μm and a depth of from more than 3 μm to less than 30 μm; and wherein a sliding frictional coefficient of the outer surface of the crucible to the graphite susceptor at 1500° C. is more than 0.6, and wherein a number of projections having a height of 0.1 mm or more is an average of less than 5 /mm 2 per unit area on the outer surface of the crucible.