Method of manufacturing vitreous silica crucible, vitreous silica crucible
US9469560B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 30, 2011 |
| Grant date | Oct 18, 2016 |
| Priority date | — |
| Expiry date | Jun 30, 2032 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/1317
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The present invention provides a method of manufacturing a vitreous silica crucible having a transparent layer by use of waste vitreous silica. According to the present invention, there is provided a method of manufacturing a vitreous silica crucible for manufacturing a monocrystalline or polycrystalline silicon ingot, including a process of vitrifying a silica powder sintered body having a crucible shape in the whole or part of the thickness direction by arc fusing the silica powder sintered body from the inner surface side, wherein the method further includes at least one means of (1) depressurizing the silica powder sintered body from the outer surface side during the arc fusing, and (2) forming a synthetic vitreous silica layer on the inner surface by spraying synthetic silica powder onto the inner surface of the silica powder sintered body during the arc fusing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.