Method of manufacturing vitreous silica crucible
US8806892B2 · kind B2 · utility
1Cited by
2References
4Claims
0Family size
Assignee
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Key dates
| Filing date | Dec 27, 2011 |
| Grant date | Aug 19, 2014 |
| Priority date | — |
| Expiry date | Jun 27, 2032 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P40/57
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The present invention provides a method of manufacturing a vitreous silica crucible including: a silica powder supplying process of supplying a material silica powder into a mold for molding a crucible, to form a silica powder layer, and an arc fusing process of arc fusing the silica powder layer by arc discharge generated by carbon electrodes, wherein the arc fusing process includes processes of measuring a temperature of the silica powder layer, and controlling a vitreous silica fused state based on a reference temperature which is a temperature at a local maximum point which appears first in the arc fusing process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.