Vitreous silica crucible and method for manufacturing the same
US9863061B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 25, 2014 |
| Grant date | Jan 9, 2018 |
| Priority date | — |
| Expiry date | Jan 10, 2035 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P40/57
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
In an embodiment, a vitreous silica crucible 1 includes a cylindrical straight body portion 10a, a corner portion 10c formed at lower end of the straight body portion 10a, and a bottom portion 10b connected with the straight body portion 10a via the corner portion 10c. Moreover, the vitreous silica crucible 1 includes a bubble-containing opaque layer 11 constituting an outer layer, and a bubble-free transparent layer 12 constituting an inner layer. A boundary surface, between the opaque layer 11 and the transparent layer 12 in at least the straight body portion 10a, forms a periodic wave surface in a vertical direction. The vitreous silica crucible can suppress deformation under high temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.