|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||117/200; 065/033.1; 065/DIG.8; 117/217|
|발명자 / 주소|
|출원인 / 주소|
|대리인 / 주소||
|인용정보||피인용 횟수 : 3 인용 특허 : 16|
A silica glass crucible includes a thin barium-doped inner layer, a stable, bubble-free intermediate layer, and a stable opaque outer layer. The fusion process of the present invention controls the dynamic gas balance at the fusion front where formed grain is melted to dense fused silica. The crucible demonstrates reduced bubble growth during a Czochralski process. As a result of the thin barium-doped layer and the reduced bubble growth, the inner surface of the crucible is uniformly minimally textured during a CZ process. The present crucible is especia...
The invention claimed is: 1. A method for making a fused silica crucible comprising: feeding bulk silica grain along an inner surface of a rotating mold to arrange the bulk silica grain in a crucible shape having a radially inner surface open to an interior space of the mold and a radially outer surface adjacent an inner wall of the mold; heating the bulk silica grain from the interior space of the mold; drawing air through the bulk silica grain and into ports distributed in the inner wall of the mold; evolving gas from the heated grain; establishing a ...