Silica crucible with pure and bubble free inner crucible layer and method of making the same
US8272234B2 · kind B2 · utility
3Cited by
18References
37Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 12, 2009 |
| Grant date | Sep 25, 2012 |
| Priority date | — |
| Expiry date | Mar 15, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T117/1032
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method of making a silica crucible in a mold cavity of the type in which air is drawing through silica grain placed in the mold cavity. A pure silica grain layer is formed on top of a natural silica grain layer. At least a portion of the purse silica grain layer is fused while substantially no air is drawn through the silica grain. Any remaining pure silica grain and a least a portion of the natural silica grain layer is fused while drawing a substantially higher volume of air through the silica. At least a portion of the fused pure silica grain layer is then sublimated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.