Closure for silica glass crucible, silica glass crucible and method of handling the same

Abstract

A closure for silica glass crucible to be mounted on an opening portion of a silica glass crucible is provided with a peripheral edge mounting portion closely adhered to an inner peripheral end of the opening portion.

1 . A closure for silica glass crucible sized and configured to be sealably mounted on an opening portion of a silica glass crucible, the closure comprising a peripheral edge mounting portion sized to closely adhere to an inner peripheral end of the opening portion. 
   
   
       2 . The closure for silica glass crucible according to  claim 1 , wherein an amount of metal components at least adhered to an inner face of the closure is not more than 0.05 ng/cm 2 . 
   
   
       3 . The closure for silica glass crucible according to  claim 1 , which further comprises a flange portion extending outward from the peripheral edge mounting portion in a radial direction. 
   
   
       4 . The closure for silica glass crucible according to  claim 1 , which has a flexibility. 
   
   
       5 . The closure for silica glass crucible according to  claim 1 , which comprises an identifier. 
   
   
       6 . The closure for silica glass crucible according to  claim 1 , wherein at least a part of the closure is transparent. 
   
   
       7 . A silica glass crucible having a disc-shaped closure in its opening portion, wherein a peripheral edge portion of the closure is sized to closely adhere to an inner peripheral end of the opening portion to fix the closure. 
   
   
       8 . A silica glass crucible having a disc-shaped closure in its opening portion, wherein a peripheral edge portion of the closure is closely adhered to an inner peripheral end of the opening portion, and wherein a flange portion extending outward from a peripheral edge mounting portion in a radial direction is closely adhered to an upper peripheral end face of the opening portion to fix the closure. 
   
   
       9 . A method of handling a silica glass crucible during the production of single crystalline silicon, comprising mounting a closure of  claim 1  onto an opening portion of a silica glass crucible over a waiting period after polycrystalline silicon is charged into the silica glass crucible until melting of the polycrystalline silicon. 
   
   
       10 . The method of  claim 9 , wherein an amount of metal components at least adhered to an inner face of the closure is not more than 0.05 ng/cm 2 . 
   
   
       11 . The method of  claim 9 , wherein the closure further comprises a flange portion extending outward from the peripheral edge mounting portion in a radial direction. 
   
   
       12 . The method of  claim 9 , wherein the closure has a flexibility. 
   
   
       13 . The method of  claim 9 , wherein the closure comprises an identifier. 
   
   
       14 . The method of  claim 9 , wherein at least a part of the closure is transparent.