| 摘要 |
PROBLEM TO BE SOLVED: To provide a mold for producing a silica crucible, of which the raw material cost can be reduced by decreasing a portion which has a small external diameter and a small wall thickness and is obliged to be cut and removed. SOLUTION: The mold 1 is used for producing the silica crucible by heat-fusing a silica powder 4 attached onto the inner wall of the mold 1 just rotating. In the mold 1, the inner side of the upper opening portion of the mold 1 corresponding to the upper part of the silica crucible is ground to obtain a step portion, and a ring-shaped heat insulating barrier member 7 having an inner diameter smaller than that of the mold 1 is disposed on a step portion 9 through a hollow-shaped disk support member 8 having an inner diameter equal to or somewhat larger than that of the heat insulating barrier member 7. COPYRIGHT: (C)2010,JPO&INPIT
|
