Patent ID: 8980004
Filing Date: 2015-03-17
Classification: C30B,Y10S,Y10T

Abstract:
1. A crucible for pulling a silicon single crystal, the crucible having a double structure comprising a silica crucible and a graphite crucible covering an outside portion of the silica crucible, wherein the silica crucible comprises, at an opening end portion, an inward falling prevention means configured to impart a radially outward force on a body portion of the silica crucible, wherein the inward falling prevention means is constructed at the opening end portion of the silica crucible as a diameter-expanded portion with a taperingly inclined part extending at an angle of 5° to 40° with respect to an upwardly extending direction of an inner surface of the body portion in the silica crucible at a point of separating from an opening end of the graphite crucible, and wherein the diameter-expanded portion has a protruding portion protruding in the radially outward direction at an angle with respect to the diameter-expanded portion.